You searched for subject:(Ultrasound imaging).
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AUT University
1.
Oldfield, Christie Erin.
Ultrasound imaging of the distal radioulnar joint: a new method to assess ulna radial translation in forearm rotation
.
Degree: 2013, AUT University
URL: http://hdl.handle.net/10292/5164 
► The current study was conducted to establish normal values of Distal radioulnar joint (DRUJ) translation using ultrasound imaging (USI). Repeatability of quantifying DRUJ translation of…
(more)
▼ The current study was conducted to establish normal values of Distal radioulnar joint (DRUJ) translation using
ultrasound imaging (USI). Repeatability of quantifying DRUJ translation of the forearm in various positions using USI was additionally investigated. Lastly the data collected was compared to previously documented values established in the literature using Computerised Tomography (CT)
imaging. It is fundamental to further clinical research in this area to ascertain the validity of using USI to quantify DRUJ translation in a normal population.
A cross-sectional reliability study was conducted with 23 normal participants.
Ultrasound examination was conducted bilaterally on two separate occasions, using the Phillips iU22 diagnostic
ultrasound machine. Static transverse images of maximal supination, neutral and maximal pronation, were taken three times. This process was repeated with the participant gripping a 1kg weight for the supination and pronation positions. Using the Sketchbook Express software programme, lines were drawn to assess the relative distance of known bony landmarks. This method is consistent with the rheumatoid arthritis subluxation ratio (RASR) described by Henmi et al. (2007). Statistical analyses of repeatability included a hierarchical mixed model method, analysis of variance (ANOVA) and Cronbach’s alpha. Validity was also assessed comparing data to previously documented values in CT literature.
Translation was found to occur in both non gripping supination and pronation compared with neutral (p<0.001). There was statistically significantly more translation found with pronation (mean=1.69mm). Ulna radial translation in supination was found to occur to a lesser extent and in a volar direction compared with neutral (mean=0.67mm). Gripping pronation did not produce statistically significant changes compared to non gripping pronation. However, gripping supination was significantly higher (p<0.01) in comparison to non gripping supination. Cronbach’s alpha measurement for internal consistency was very high (0.9). Other than forearm position, there was no statistically significant difference between hand, left versus right, state or session. The RASR values in the current study demonstrated consistent measurements when compared to previously documented values.
This study demonstrated that USI can reliably detect translatory movement of the DRUJ in healthy participants. It supports the role of USI in future musculoskeletal applications and research. Alternative methods to accurately record translation may provide a less expensive and more accessible diagnostic tool in assessing DRUJ instability. This would reduce the dependence on CT or magnetic resonance
imaging (MRI) scans to diagnose DRUJ instability in patients after trauma, inflammatory joint diseases or developmental disorders.
Advisors/Committee Members: Hing, Wayne (advisor).
Subjects/Keywords: DRUJ;
Ultrasound imaging
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APA (6th Edition):
Oldfield, C. E. (2013). Ultrasound imaging of the distal radioulnar joint: a new method to assess ulna radial translation in forearm rotation
. (Thesis). AUT University. Retrieved from http://hdl.handle.net/10292/5164
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Oldfield, Christie Erin. “Ultrasound imaging of the distal radioulnar joint: a new method to assess ulna radial translation in forearm rotation
.” 2013. Thesis, AUT University. Accessed March 05, 2021.
http://hdl.handle.net/10292/5164.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Oldfield, Christie Erin. “Ultrasound imaging of the distal radioulnar joint: a new method to assess ulna radial translation in forearm rotation
.” 2013. Web. 05 Mar 2021.
Vancouver:
Oldfield CE. Ultrasound imaging of the distal radioulnar joint: a new method to assess ulna radial translation in forearm rotation
. [Internet] [Thesis]. AUT University; 2013. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/10292/5164.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Oldfield CE. Ultrasound imaging of the distal radioulnar joint: a new method to assess ulna radial translation in forearm rotation
. [Thesis]. AUT University; 2013. Available from: http://hdl.handle.net/10292/5164
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Alberta
2.
Sampaleanu, Alexander P.
Top-Orthogonal-to-Bottom-Electrode Capacitive Micromachined
Ultrasound Transducers for Low-Cost 3D Ultrasound Imaging.
Degree: MS, Department of Electrical and Computer
Engineering, 2013, University of Alberta
URL: https://era.library.ualberta.ca/files/kw52j904w
► Capacitive micromachined ultrasound transducers (CMUTs) offer a promising solution for three-dimensional ultrasound imaging due to their ability to be easily fabricated in two-dimensional arrays. However,…
(more)
▼ Capacitive micromachined ultrasound transducers
(CMUTs) offer a promising solution for three-dimensional ultrasound
imaging due to their ability to be easily fabricated in
two-dimensional arrays. However, channel routing is still
non-trivial and cost-intensive. The subject of this thesis is a
‘Top-Orthogonal-to-Bottom-Electrode’ (TOBE) 2-D CMUT array
architecture, along with its respective row-column addressing
schemes, which can significantly reduce the channel count of a 2-D
array, such that only 2N channels are required for an N x N array.
Background on acoustics, ultrasound imaging, and CMUT technology is
presented before the novel array architecture and imaging schemes
is described. Arrays were fabricated using a sacrificial release
method, and acoustic immersion and air-coupled tests, along with
imaging simulations, were done to validate array functionality.
Results showed that single-element actuation is possible with a
row-column addressing scheme, allowing for novel imaging schemes
which could result in significantly more cost-effective 3-D
ultrasound imaging.
Subjects/Keywords: MEMS; CMUT; Ultrasound; Imaging
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APA (6th Edition):
Sampaleanu, A. P. (2013). Top-Orthogonal-to-Bottom-Electrode Capacitive Micromachined
Ultrasound Transducers for Low-Cost 3D Ultrasound Imaging. (Masters Thesis). University of Alberta. Retrieved from https://era.library.ualberta.ca/files/kw52j904w
Chicago Manual of Style (16th Edition):
Sampaleanu, Alexander P. “Top-Orthogonal-to-Bottom-Electrode Capacitive Micromachined
Ultrasound Transducers for Low-Cost 3D Ultrasound Imaging.” 2013. Masters Thesis, University of Alberta. Accessed March 05, 2021.
https://era.library.ualberta.ca/files/kw52j904w.
MLA Handbook (7th Edition):
Sampaleanu, Alexander P. “Top-Orthogonal-to-Bottom-Electrode Capacitive Micromachined
Ultrasound Transducers for Low-Cost 3D Ultrasound Imaging.” 2013. Web. 05 Mar 2021.
Vancouver:
Sampaleanu AP. Top-Orthogonal-to-Bottom-Electrode Capacitive Micromachined
Ultrasound Transducers for Low-Cost 3D Ultrasound Imaging. [Internet] [Masters thesis]. University of Alberta; 2013. [cited 2021 Mar 05].
Available from: https://era.library.ualberta.ca/files/kw52j904w.
Council of Science Editors:
Sampaleanu AP. Top-Orthogonal-to-Bottom-Electrode Capacitive Micromachined
Ultrasound Transducers for Low-Cost 3D Ultrasound Imaging. [Masters Thesis]. University of Alberta; 2013. Available from: https://era.library.ualberta.ca/files/kw52j904w
University of Alberta
3.
Zhang, Chan.
Application of Ultrasound to Guide Pedicle Screw Insertion
during Scoliosis Surgery: a Feasibility Study.
Degree: MS, Radiology and Diagnostic Imaging, 2010, University of Alberta
URL: https://era.library.ualberta.ca/files/4f16c425j
► This thesis presents an experimental study of a bovine vertebra using transmission and pulse-echo methods and a preliminary investigation to guide a screw insertion into…
(more)
▼ This thesis presents an experimental study of a bovine
vertebra using transmission and pulse-echo methods and a
preliminary investigation to guide a screw insertion into a pedicle
using TomoScan phased array unit. The results show the cancellous
bone has higher attenuation than the cortical bone for 1.0-5.0 MHz.
The optimal frequencies for imaging are found to be 3.5 and 5.0
MHz. When the sample is filled with water with the cancellous core
removed, all reflections from the layers and screw are visible;
however when the core is present, only reflections from the top
cortex are identifiable. For the preliminary study, size and
placement of the transducer array are important. When the
ultrasound beam is normal to the pedicle surface, echoes from the
pedicle layers and the steel bit are strong; otherwise, signals are
weak and not even identifiable. Larger aperture size will enhance
the signal-to-noise ratio but deteriorate lateral
resolution.
Subjects/Keywords: Bone Imaging; Ultrasound; Scoliosis Surgery
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APA (6th Edition):
Zhang, C. (2010). Application of Ultrasound to Guide Pedicle Screw Insertion
during Scoliosis Surgery: a Feasibility Study. (Masters Thesis). University of Alberta. Retrieved from https://era.library.ualberta.ca/files/4f16c425j
Chicago Manual of Style (16th Edition):
Zhang, Chan. “Application of Ultrasound to Guide Pedicle Screw Insertion
during Scoliosis Surgery: a Feasibility Study.” 2010. Masters Thesis, University of Alberta. Accessed March 05, 2021.
https://era.library.ualberta.ca/files/4f16c425j.
MLA Handbook (7th Edition):
Zhang, Chan. “Application of Ultrasound to Guide Pedicle Screw Insertion
during Scoliosis Surgery: a Feasibility Study.” 2010. Web. 05 Mar 2021.
Vancouver:
Zhang C. Application of Ultrasound to Guide Pedicle Screw Insertion
during Scoliosis Surgery: a Feasibility Study. [Internet] [Masters thesis]. University of Alberta; 2010. [cited 2021 Mar 05].
Available from: https://era.library.ualberta.ca/files/4f16c425j.
Council of Science Editors:
Zhang C. Application of Ultrasound to Guide Pedicle Screw Insertion
during Scoliosis Surgery: a Feasibility Study. [Masters Thesis]. University of Alberta; 2010. Available from: https://era.library.ualberta.ca/files/4f16c425j
4.
Daeichin, Verya.
Micro-Ultrasound Molecular Imaging.
Degree: 2015, Erasmus University Medical Center
URL: http://hdl.handle.net/1765/77555
► markdownabstract__Abstract__ Perhaps using sound to identify objects, those which remained mysterious to sight and touch senses, is one of the very early diagnostic tools mankind…
(more)
▼ markdownabstract__Abstract__
Perhaps using sound to identify objects, those which remained mysterious to sight and touch senses, is one of the very early diagnostic tools mankind has ever used. We all can distinguish the sound of a plastic cup from one made of glass when tapped by a finger nail no matter how similar they look. The sounds that we hear and those that we don’t, are mechanical vibrations (acoustic waves) traveling through a compressible and expandable (elastic) medium such as air or water. We can recognize the sound of a glass cup from a plastic one because of the fact that such mechanical vibrations of the particles of materials with dissimilar properties are unlike. Perhaps the most characteristic properties of an acoustic wave are its amplitude and its pitch (frequency). The amplitude of a sound determines how loud the sound is. The frequency of a sound is an indicator of how fast are the mechanical vibrations of the medium substances.
Subjects/Keywords: imaging; ultrasound
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APA (6th Edition):
Daeichin, V. (2015). Micro-Ultrasound Molecular Imaging. (Doctoral Dissertation). Erasmus University Medical Center. Retrieved from http://hdl.handle.net/1765/77555
Chicago Manual of Style (16th Edition):
Daeichin, Verya. “Micro-Ultrasound Molecular Imaging.” 2015. Doctoral Dissertation, Erasmus University Medical Center. Accessed March 05, 2021.
http://hdl.handle.net/1765/77555.
MLA Handbook (7th Edition):
Daeichin, Verya. “Micro-Ultrasound Molecular Imaging.” 2015. Web. 05 Mar 2021.
Vancouver:
Daeichin V. Micro-Ultrasound Molecular Imaging. [Internet] [Doctoral dissertation]. Erasmus University Medical Center; 2015. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/1765/77555.
Council of Science Editors:
Daeichin V. Micro-Ultrasound Molecular Imaging. [Doctoral Dissertation]. Erasmus University Medical Center; 2015. Available from: http://hdl.handle.net/1765/77555
Delft University of Technology
5.
Visser, Bram (author).
Calibration of a Single element ultrasound transducer using an aberration mask.
Degree: 2019, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:3fa73fcf-044b-4f4c-b425-1e3d76acd31a
► Previous work [1] has demonstrated the possibility of high resolution imaging through the use of a single element and a aberration mask. This thesis will…
(more)
▼ Previous work [1] has demonstrated the possibility of high resolution
imaging through the use of a single element and a aberration mask. This thesis will expand on the previous work by examining the proposed method for errors in the creation of the model. The analysis is preformed by examining the various aspects of the measurements setup and underlying theoretical model, after which measurements are performed to determine their contribution and correctness with regard to the model. Results demonstrated a systematic error of a non-linear frequency scaling and semi-linear phase shift. The origin of the error lies in the unwanted addition of transfer functions of some of the components. A Tikhonov regularized least squares method is proposed to estimate this transfer function and supply compensation based on all the measurements. The results of application of this method on the uncalibrated model are demonstrated through 1D
imaging experiments. The result of which show a signicant improvement over the previous uncalibrated results. After which the possibility of calibration due to a singular measurement is explored and a adaptation of the Tikhonov regularized least squares method is proposed for close approximation of the previously found transfer function. Further to obtain an indication of possible remaining hurdles and successes with this method, extensive simulations are preformed to examine the individual impact of various sources of noise and interference.
Advisors/Committee Members: Leus, Geert (mentor), Kruizinga, Pieter (graduation committee), van der Meulen, Pim (graduation committee), Delft University of Technology (degree granting institution).
Subjects/Keywords: Calibration; Ultrasound; Single element imaging
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APA (6th Edition):
Visser, B. (. (2019). Calibration of a Single element ultrasound transducer using an aberration mask. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:3fa73fcf-044b-4f4c-b425-1e3d76acd31a
Chicago Manual of Style (16th Edition):
Visser, Bram (author). “Calibration of a Single element ultrasound transducer using an aberration mask.” 2019. Masters Thesis, Delft University of Technology. Accessed March 05, 2021.
http://resolver.tudelft.nl/uuid:3fa73fcf-044b-4f4c-b425-1e3d76acd31a.
MLA Handbook (7th Edition):
Visser, Bram (author). “Calibration of a Single element ultrasound transducer using an aberration mask.” 2019. Web. 05 Mar 2021.
Vancouver:
Visser B(. Calibration of a Single element ultrasound transducer using an aberration mask. [Internet] [Masters thesis]. Delft University of Technology; 2019. [cited 2021 Mar 05].
Available from: http://resolver.tudelft.nl/uuid:3fa73fcf-044b-4f4c-b425-1e3d76acd31a.
Council of Science Editors:
Visser B(. Calibration of a Single element ultrasound transducer using an aberration mask. [Masters Thesis]. Delft University of Technology; 2019. Available from: http://resolver.tudelft.nl/uuid:3fa73fcf-044b-4f4c-b425-1e3d76acd31a
Delft University of Technology
6.
Shi, Yixin (author).
A Low-Power Area-Efficient SAR-Assisted Hybrid ADC for Ultrasound Imaging.
Degree: 2017, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:b38b134c-88a8-4fe8-a706-68abb0a715cc
► This thesis presents a Low-Power Area-Ecient SAR-Assisted Hybrid ADC for ultra- sound imaging systems. This ADC combines a 5-bit SAR ADC per channel with a…
(more)
▼ This thesis presents a Low-Power Area-Ecient SAR-Assisted Hybrid ADC for ultra- sound imaging systems. This ADC combines a 5-bit SAR ADC per channel with a 4-bit single-slope ADC that produces the converter's LSBs and is implemented using shared hardware. The number of unit capacitors of the proposed ADC is about 1/16th of that of a 9-bit conventional SAR ADC, thus saving die area. The power consumption is reduced by sharing the delay line and ramp generator of the single-slope ADC among an ADC array. The simulated ENOB is 8.48bits, the power consumption is 419.3µW at a sampling rate of 33MS/s, the achieved FoM is 36fJ/conv-step. The estimated die area per channel is 150µm×107µm.
Electrical Engineering
Advisors/Committee Members: Pertijs, Michiel (mentor), Delft University of Technology (degree granting institution).
Subjects/Keywords: Hybrid ADC; SAR; ultrasound imaging
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APA ·
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APA (6th Edition):
Shi, Y. (. (2017). A Low-Power Area-Efficient SAR-Assisted Hybrid ADC for Ultrasound Imaging. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:b38b134c-88a8-4fe8-a706-68abb0a715cc
Chicago Manual of Style (16th Edition):
Shi, Yixin (author). “A Low-Power Area-Efficient SAR-Assisted Hybrid ADC for Ultrasound Imaging.” 2017. Masters Thesis, Delft University of Technology. Accessed March 05, 2021.
http://resolver.tudelft.nl/uuid:b38b134c-88a8-4fe8-a706-68abb0a715cc.
MLA Handbook (7th Edition):
Shi, Yixin (author). “A Low-Power Area-Efficient SAR-Assisted Hybrid ADC for Ultrasound Imaging.” 2017. Web. 05 Mar 2021.
Vancouver:
Shi Y(. A Low-Power Area-Efficient SAR-Assisted Hybrid ADC for Ultrasound Imaging. [Internet] [Masters thesis]. Delft University of Technology; 2017. [cited 2021 Mar 05].
Available from: http://resolver.tudelft.nl/uuid:b38b134c-88a8-4fe8-a706-68abb0a715cc.
Council of Science Editors:
Shi Y(. A Low-Power Area-Efficient SAR-Assisted Hybrid ADC for Ultrasound Imaging. [Masters Thesis]. Delft University of Technology; 2017. Available from: http://resolver.tudelft.nl/uuid:b38b134c-88a8-4fe8-a706-68abb0a715cc
Georgia Tech
7.
Satir, Sarp.
Modeling and optimization of capacitive micromachined ultrasonic transducers.
Degree: PhD, Electrical and Computer Engineering, 2014, Georgia Tech
URL: http://hdl.handle.net/1853/54303
► The objective of this research is to develop large signal modeling and optimization methods for Capacitive Micromachined Ultrasonic Transducers (CMUTs), especially when they are used…
(more)
▼ The objective of this research is to develop large signal modeling and optimization methods for Capacitive Micromachined Ultrasonic Transducers (CMUTs), especially when they are used in an array configuration. General modeling and optimization methods that cover a large domain of CMUT designs are crucial, as many membrane and array geometry combinations are possible using existing microfabrication technologies. Currently, large signal modeling methods for CMUTs are not well established and nonlinear
imaging techniques utilizing linear piezoelectric transducers are not applicable to CMUTs because of their strong nonlinearity. In this work, the nonlinear CMUT behavior is studied, and a feedback linearization method is proposed to reduce the CMUT nonlinearity. This method is shown to improve the CMUT performance for continuous wave applications, such as high-intensity focused
ultrasound or harmonic
imaging, where transducer linearity is crucial. In the second part of this dissertation, a large signal model is developed that is capable of transient modeling of CMUT arrays with arbitrary electrical terminations. The developed model is suitable for iterative design optimization of CMUTs and CMUT based
imaging systems with arbitrary membrane and array geometries for a variety of applications. Finally, a novel multi-pulse method for nonlinear tissue and contrast agent
imaging with CMUTs is presented. It is shown that the nonlinear content can be successfully extracted from echo signals in a CMUT based
imaging system using a multiple pulse scheme. The proposed method is independent of the CMUT geometry and valid for large signal operation. Experimental results verifying the developed large signal CMUT array model, proposed gap feedback and multi-pulse techniques are also presented.
Advisors/Committee Members: Degertekin, F. Levent (advisor), Brand, Oliver (committee member), Sabra, Karim (committee member), Ghovanloo, Maysam (committee member), Bhatti, Pamela (committee member).
Subjects/Keywords: CMUTs; Ultrasound imaging; Nonlinear modeling
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APA (6th Edition):
Satir, S. (2014). Modeling and optimization of capacitive micromachined ultrasonic transducers. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/54303
Chicago Manual of Style (16th Edition):
Satir, Sarp. “Modeling and optimization of capacitive micromachined ultrasonic transducers.” 2014. Doctoral Dissertation, Georgia Tech. Accessed March 05, 2021.
http://hdl.handle.net/1853/54303.
MLA Handbook (7th Edition):
Satir, Sarp. “Modeling and optimization of capacitive micromachined ultrasonic transducers.” 2014. Web. 05 Mar 2021.
Vancouver:
Satir S. Modeling and optimization of capacitive micromachined ultrasonic transducers. [Internet] [Doctoral dissertation]. Georgia Tech; 2014. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/1853/54303.
Council of Science Editors:
Satir S. Modeling and optimization of capacitive micromachined ultrasonic transducers. [Doctoral Dissertation]. Georgia Tech; 2014. Available from: http://hdl.handle.net/1853/54303
University of Texas – Austin
8.
-2455-7116.
Optically-triggered nanodroplets for enhanced ultrasound and photoacoustic imaging.
Degree: PhD, Biomedical Engineering, 2015, University of Texas – Austin
URL: http://hdl.handle.net/2152/30343
► Medical ultrasound imaging is ubiquitous in clinics due to its safety, low cost, portability, and imaging depth. The development of technologies to assist ultrasound in…
(more)
▼ Medical
ultrasound imaging is ubiquitous in clinics due to its safety, low cost, portability, and
imaging depth. The development of technologies to assist
ultrasound in the diagnosis of diseases thus have a potentially broad clinical impact. More recently, photoacoustics has emerged as a complementary, high contrast modality for
imaging optical absorption. Injectable dyes and nanoparticles locally amplify
ultrasound and photoacoustic signal, helping to identify disease markers and track its progression. We have constructed a dual
ultrasound and photoacoustic contrast agent that can be activated using an external optical trigger. In response to pulsed laser irradiation, the particle undergoes a liquid to gas phase change, or vaporization, which emits a strong acoustic wave and results in an echogenic microbubble, simultaneously enhancing contrast for both modalities. We designed and developed several iterations of particles, altering parameters to optimize biocompatibility, cost, and image contrast enhancement, and we then characterized key traits of the particles. Next, we imaged the contrast agents in phantom, ex vivo, and in vivo models to validate the image enhancement, developing image process algorithms to maximize image quality. These optically triggered contrast agents are a valuable tool for minimally invasive, highly specific, early identification of cancer.
Advisors/Committee Members: Emelianov, Stanislav Y. (advisor).
Subjects/Keywords: Ultrasound; Imaging; Contrast agents; Perfluorocarbon
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APA (6th Edition):
-2455-7116. (2015). Optically-triggered nanodroplets for enhanced ultrasound and photoacoustic imaging. (Doctoral Dissertation). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/30343
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
Chicago Manual of Style (16th Edition):
-2455-7116. “Optically-triggered nanodroplets for enhanced ultrasound and photoacoustic imaging.” 2015. Doctoral Dissertation, University of Texas – Austin. Accessed March 05, 2021.
http://hdl.handle.net/2152/30343.
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
MLA Handbook (7th Edition):
-2455-7116. “Optically-triggered nanodroplets for enhanced ultrasound and photoacoustic imaging.” 2015. Web. 05 Mar 2021.
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
Vancouver:
-2455-7116. Optically-triggered nanodroplets for enhanced ultrasound and photoacoustic imaging. [Internet] [Doctoral dissertation]. University of Texas – Austin; 2015. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/2152/30343.
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
Council of Science Editors:
-2455-7116. Optically-triggered nanodroplets for enhanced ultrasound and photoacoustic imaging. [Doctoral Dissertation]. University of Texas – Austin; 2015. Available from: http://hdl.handle.net/2152/30343
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
Rutgers University
9.
Zeng, Xuxin, 1992-.
Hierarchical 3-D registration of ultrasound-computed tomography of femur shaft fracture using reinforcement learning.
Degree: MS, Biomedical Engineering, 2020, Rutgers University
URL: https://rucore.libraries.rutgers.edu/rutgers-lib/62547/
► Femoral shaft fracture, a bone fracture that involves the femur, typically sustained in high-energy injuries, such as a car crash. Improper treatment of fixation or…
(more)
▼ Femoral shaft fracture, a bone fracture that involves the femur, typically sustained in high-energy injuries, such as a car crash. Improper treatment of fixation or alignment may cause soft tissue injuries, bone loss and significant high risk on pulmonary compliance. Therefore, the treatments with surgical guidance are of importance in deducing the rate of compliance and improving the accuracy of the operation. Image-guided computer-assisted orthopedic surgery has been explored in improving the outcomes of the femoral shaft fracture treatments. And the domain intra-operative
imaging modality fluoroscopy used in CAOS is 2D fluoroscopy. 3D anatomical representation from 2D fluoroscopy requires high volume of 2D data from different directions, which has pool reproductivities into 3D due to the limit field of view in 2D fluoroscopy. Furthermore, the increasing operation time with ionizing radiation exposure from fluoroscopy modality brings essential concerns for the safety of the surgeon and patient. Recently,
ultrasound (US) has been investigated as an alternative intra-operative
imaging modality due to its real-time, safe and 2D/3D
imaging capabilities.
However, lower signal to noise ratio (SNR),
imaging artifacts, limited field of view (FOV) and blurred bone boundaries have hindered wide spread adaption of US in CAOS. In order to overcome these limitations, automatic bone segmentation and intra-operative registration methods have been developed. Accurate, robust and real-time segmentation and registration is necessary for successful guidance in US-based CAOS. This thesis presents an automated hierarchical registration method using reinforcement learning, for accurate, robust and real-time registration of intra-operative US to pre-operative CT data.
The proposed framework consists of: (1) bone shadow region image enhancement and segmentation, (2) point cloud modeling from the segmented bone surface image, and (3) point cloud registration using Q-learning of US-CT. Local phase image features are used as an input to an L1-norm-based regularization framework for enhancement of bone shadow regions. Simple bottom up ray casting method is used to segment the bone surfaces from the enhanced bone shadow images. In addition, CT data was segmented using intensity-based thresholding method. In other words, the complicated cross-modality US-CT registration was transformed into point cloud registration. In the next step, we proposed a hierarchical registration method using supervised Q-learning that learns the optimal sequence of motion action to achieve the optimal alignment. Within this approach, the agent is modeled using PointNet++ framework, with point cloud data obtained by segmenting the US and CT data as the input, and the next optimal action as the output. The quantitative and qualitative evaluations are performed on over 100 test cases and have shown the potential in making
ultrasound as an alternative intra-operative image modality in image-guidance. The target registration error (TRE) and fiducial registration error…
Advisors/Committee Members: Hacihaliloglu, Ilker (chair), Pierce, Mark (internal member), Boustany, Nada N. (internal member), School of Graduate Studies.
Subjects/Keywords: Ultrasound; Femur – Ultrasonic imaging
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APA (6th Edition):
Zeng, Xuxin, 1. (2020). Hierarchical 3-D registration of ultrasound-computed tomography of femur shaft fracture using reinforcement learning. (Masters Thesis). Rutgers University. Retrieved from https://rucore.libraries.rutgers.edu/rutgers-lib/62547/
Chicago Manual of Style (16th Edition):
Zeng, Xuxin, 1992-. “Hierarchical 3-D registration of ultrasound-computed tomography of femur shaft fracture using reinforcement learning.” 2020. Masters Thesis, Rutgers University. Accessed March 05, 2021.
https://rucore.libraries.rutgers.edu/rutgers-lib/62547/.
MLA Handbook (7th Edition):
Zeng, Xuxin, 1992-. “Hierarchical 3-D registration of ultrasound-computed tomography of femur shaft fracture using reinforcement learning.” 2020. Web. 05 Mar 2021.
Vancouver:
Zeng, Xuxin 1. Hierarchical 3-D registration of ultrasound-computed tomography of femur shaft fracture using reinforcement learning. [Internet] [Masters thesis]. Rutgers University; 2020. [cited 2021 Mar 05].
Available from: https://rucore.libraries.rutgers.edu/rutgers-lib/62547/.
Council of Science Editors:
Zeng, Xuxin 1. Hierarchical 3-D registration of ultrasound-computed tomography of femur shaft fracture using reinforcement learning. [Masters Thesis]. Rutgers University; 2020. Available from: https://rucore.libraries.rutgers.edu/rutgers-lib/62547/
Boston University
10.
Subaran, Sarah Samira.
A visual comparison between the Ultrasound X6-1 Matrix transducer and MRI in lesion detection in the dome of the liver.
Degree: MS, Bioimaging, 2014, Boston University
URL: http://hdl.handle.net/2144/14393
► Imaging the dome of the liver can be a very challenging area to image by Ultrasound. Due to its position inside the ribcage there can…
(more)
▼ Imaging the dome of the liver can be a very challenging area to image by Ultrasound. Due to its position inside the ribcage there can be difficulty with rib shadowing artifacts causing the sonographer to miss small lesions. The X6–1 Matrix transducer is one of the newest of its kind and claims to be the better multi-use transducer. Its larger aperture reduces rib artifacts and is composed of PureWave Crystal Technology. A phantom will serve as a great approach in this abdominal study to visually compare the lesions between MRI (gold standard) and the new X6–1 Matrix Ultrasound transducer. The X6–1 transducers did reveal minimal rib shadowing and the small lesions were identified.
Subjects/Keywords: Medical imaging; Imaging; Liver; MRI; Ultrasound
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APA (6th Edition):
Subaran, S. S. (2014). A visual comparison between the Ultrasound X6-1 Matrix transducer and MRI in lesion detection in the dome of the liver. (Masters Thesis). Boston University. Retrieved from http://hdl.handle.net/2144/14393
Chicago Manual of Style (16th Edition):
Subaran, Sarah Samira. “A visual comparison between the Ultrasound X6-1 Matrix transducer and MRI in lesion detection in the dome of the liver.” 2014. Masters Thesis, Boston University. Accessed March 05, 2021.
http://hdl.handle.net/2144/14393.
MLA Handbook (7th Edition):
Subaran, Sarah Samira. “A visual comparison between the Ultrasound X6-1 Matrix transducer and MRI in lesion detection in the dome of the liver.” 2014. Web. 05 Mar 2021.
Vancouver:
Subaran SS. A visual comparison between the Ultrasound X6-1 Matrix transducer and MRI in lesion detection in the dome of the liver. [Internet] [Masters thesis]. Boston University; 2014. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/2144/14393.
Council of Science Editors:
Subaran SS. A visual comparison between the Ultrasound X6-1 Matrix transducer and MRI in lesion detection in the dome of the liver. [Masters Thesis]. Boston University; 2014. Available from: http://hdl.handle.net/2144/14393
Queensland University of Technology
11.
Khoei, Shadi.
Quantitative ultrasound computed tomography imaging of PAGAT radiation dosimetry gel.
Degree: 2013, Queensland University of Technology
URL: https://eprints.qut.edu.au/63958/
► This research developed and scientifically validated a new ultrasound transmission computed tomography system with the aim of quantitative assessment of a polymer gel dosimeter including…
(more)
▼ This research developed and scientifically validated a new ultrasound transmission computed tomography system with the aim of quantitative assessment of a polymer gel dosimeter including dose response verification of ultrasonic parameters of attenuation, velocity and broadband ultrasound attenuation (BUA). This work was the first to investigate and report ultrasound frequency dependent attenuation in a gel dosimeter, demonstrating a dose dependence.
Subjects/Keywords: Ultrasound computed tomography; Ultrasound attenuation; Broadband ultrasound attenuation; Ultrasound imaging; Polymer gel dosimetry
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APA (6th Edition):
Khoei, S. (2013). Quantitative ultrasound computed tomography imaging of PAGAT radiation dosimetry gel. (Thesis). Queensland University of Technology. Retrieved from https://eprints.qut.edu.au/63958/
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Khoei, Shadi. “Quantitative ultrasound computed tomography imaging of PAGAT radiation dosimetry gel.” 2013. Thesis, Queensland University of Technology. Accessed March 05, 2021.
https://eprints.qut.edu.au/63958/.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Khoei, Shadi. “Quantitative ultrasound computed tomography imaging of PAGAT radiation dosimetry gel.” 2013. Web. 05 Mar 2021.
Vancouver:
Khoei S. Quantitative ultrasound computed tomography imaging of PAGAT radiation dosimetry gel. [Internet] [Thesis]. Queensland University of Technology; 2013. [cited 2021 Mar 05].
Available from: https://eprints.qut.edu.au/63958/.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Khoei S. Quantitative ultrasound computed tomography imaging of PAGAT radiation dosimetry gel. [Thesis]. Queensland University of Technology; 2013. Available from: https://eprints.qut.edu.au/63958/
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Oxford
12.
Rademeyer, Paul.
A new technique for microbubble characterisation and the implications to contrast enhanced ultrasound.
Degree: PhD, 2016, University of Oxford
URL: https://ora.ox.ac.uk/objects/uuid:2f5b0002-83e0-4251-b69a-de78c9895277
;
https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.730488
► The utility of microbubble agents in a variety of diagnostic and therapeutic ultrasound techniques has been widely demonstrated, most notably in Contrast Enhanced Ultrasound (CEUS)…
(more)
▼ The utility of microbubble agents in a variety of diagnostic and therapeutic ultrasound techniques has been widely demonstrated, most notably in Contrast Enhanced Ultrasound (CEUS) imaging. Unfortunately, the underlying mechanisms of their response to ultrasound excitation are poorly understood, restricting the development of promising techniques, such as quantitative perfusion imaging. A significant reason for this is that current microbubble characterisation techniques suffer from one or more of the following limitations: i) large experimental uncertainties, ii) physical restrictions on microbubble response and iii) failure to provide large data sets suitable for statistical analysis. This thesis presents a new technique to overcome these limitations. A co-axial microfluidic device is used to hydrodynamically confine microbubbles through the focal region of a laser and ultrasound field. The magnitude of light scattered by isolated microbubbles during ultrasound excitation is converted to radius using Mie Scattering theory. This technique is capable of obtaining large samples (>103/min) of microbubbles to be efficiently characterised. The response of a commercial contrast agent, SonoVue®, is first investigated for a range of ultrasound exposure parameters; frequency (2 MHz - 4.5 MHz), peak negative pressure (6 kPa - 400 kPa) and pulse length (3 cycles - 8 cycles). Second the device is used to investigate the effect of composition and fabrication on microbubble response to similar ultrasound conditions. The results demonstrate a very large variability in microbubble response independent of initial size, indicating a significant lack of uniformity of coating properties. This is further supported by quantitative fluorescence imaging and quasi-static pressure chamber measurements. The implications of the findings for CEUS imaging and the development of microbubble contrast agents are discussed, as well as the limitations and suggested improvements of the characterisation technique.
Subjects/Keywords: 616.07; Ultrasound Imaging; Biomedical engineering; Contrast Enhanced Ultrasound; Ultrasound Contrast Agents; Microbubbles; Characterisation; Ultrasound
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APA (6th Edition):
Rademeyer, P. (2016). A new technique for microbubble characterisation and the implications to contrast enhanced ultrasound. (Doctoral Dissertation). University of Oxford. Retrieved from https://ora.ox.ac.uk/objects/uuid:2f5b0002-83e0-4251-b69a-de78c9895277 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.730488
Chicago Manual of Style (16th Edition):
Rademeyer, Paul. “A new technique for microbubble characterisation and the implications to contrast enhanced ultrasound.” 2016. Doctoral Dissertation, University of Oxford. Accessed March 05, 2021.
https://ora.ox.ac.uk/objects/uuid:2f5b0002-83e0-4251-b69a-de78c9895277 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.730488.
MLA Handbook (7th Edition):
Rademeyer, Paul. “A new technique for microbubble characterisation and the implications to contrast enhanced ultrasound.” 2016. Web. 05 Mar 2021.
Vancouver:
Rademeyer P. A new technique for microbubble characterisation and the implications to contrast enhanced ultrasound. [Internet] [Doctoral dissertation]. University of Oxford; 2016. [cited 2021 Mar 05].
Available from: https://ora.ox.ac.uk/objects/uuid:2f5b0002-83e0-4251-b69a-de78c9895277 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.730488.
Council of Science Editors:
Rademeyer P. A new technique for microbubble characterisation and the implications to contrast enhanced ultrasound. [Doctoral Dissertation]. University of Oxford; 2016. Available from: https://ora.ox.ac.uk/objects/uuid:2f5b0002-83e0-4251-b69a-de78c9895277 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.730488
University of Southern California
13.
Ma, Teng.
Multi-modality intravascular imaging by combined use of
ultrasonic and opticial techniques.
Degree: PhD, Biomedical Engineering, 2017, University of Southern California
URL: http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll3/id/616089/rec/4254
► Thin-capped fibroatheroma (TCFA) is considered to be the phenotype of vulnerable atherosclerotic plaque based on the pathological studies, whose sudden rupture is frequently responsible for…
(more)
▼ Thin-capped fibroatheroma (TCFA) is considered to be
the phenotype of vulnerable atherosclerotic plaque based on the
pathological studies, whose sudden rupture is frequently
responsible for acute coronary syndrome (ACS). Early detection and
prognosis of TCFA will not only guide the therapeutic strategy to
benefit the patients, but also contribute to the study of natural
history of vulnerable plaque that is still elusive. To date,
various
imaging modalities employing ultrasonic scattering contrast
with radio frequency analysis, optical scattering contrast, optical
absorption mechanism, spectroscopic analysis and targeted-molecular
imaging method, provide diverse visualizations of coronary arteries
both in clinic and research. However, none of these
imaging
modalities has been symmetrically validated to precisely detect
TCFA in vivo, since any single
imaging modality exhibit natural
limitations when characterizing the elusive TCFA. Therefore,
integration of theses
imaging modalities into a single catheter is
hypothesized to be the optimal method to enable the early detection
of TCFA by combing best features of these techniques while
compensating their respective weakness. ❧ In this thesis, several
multi-modality intravascular
imaging systems by combined use of
ultrasonic and optical techniques were developed in three aspects
to access the morphological information, functional components, and
elasticity of coronary arteries. Aim to fully obtain the
morphological information real time in vivo, an ultra-high speed
integrated intravascular
ultrasound (IVUS) and optical coherence
tomography (OCT) system has been optimized and prototyped.
Statistical validation study and IVUS-OCT diagnostic criteria
development has demonstrated that the integrated IVUS-OCT system
has an overall higher diagnostic accuracy of atherosclerotic
plaques, especially for lipid-rich plaques. From the cost-effective
perspectives, a multi-frequency IVUS
imaging system was developed
to improve the trade-off between resolution and depth of
penetration of IVUS. Aiming to measure the thin fibrous cap, an
ultra-high frequency IVUS transducer was incorporated into the
conventional IVUS catheter to provide higher special resolution
image of the coronary artery, which makes the multi-frequency IVUS
imaging system an alternative of integrated IVUS-OCT system.
Moreover, the development of a high speed integrated IVUS and
intravascular photoacoustic (IVPA) system make it possible to
quantify a key parameter of diagnosing TCFA—the size of lipid
deposition inside coronary artery. In vitro
imaging of lipid-laden
artery was performed by using current IVUS-IVPA system with 2
orders of magnitude improvement of
imaging speed, which bridged the
gap of translating the IVUS-IVPA technology to clinical study. In
order to characterized the biomechanical properties of plaque
components, acoustic radiation force (ARF) optical coherence
elastography (OCE) is further developed featured by the confocal
alignment of OCT detection region with acoustic excitation field.
Based on the…
Advisors/Committee Members: Shung, Kirk KopingZhou, Qifa (Committee Chair), Yen, Jesse (Committee Member), Armani, Andrea M. (Committee Member), McCain, Megan (Committee Member).
Subjects/Keywords: atherosclerosis; intravascular imaging; intravascular ultrasound; high frequency ultrasound; multi-modality imaging; photoacoustic imaging
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APA ·
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MLA ·
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to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Ma, T. (2017). Multi-modality intravascular imaging by combined use of
ultrasonic and opticial techniques. (Doctoral Dissertation). University of Southern California. Retrieved from http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll3/id/616089/rec/4254
Chicago Manual of Style (16th Edition):
Ma, Teng. “Multi-modality intravascular imaging by combined use of
ultrasonic and opticial techniques.” 2017. Doctoral Dissertation, University of Southern California. Accessed March 05, 2021.
http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll3/id/616089/rec/4254.
MLA Handbook (7th Edition):
Ma, Teng. “Multi-modality intravascular imaging by combined use of
ultrasonic and opticial techniques.” 2017. Web. 05 Mar 2021.
Vancouver:
Ma T. Multi-modality intravascular imaging by combined use of
ultrasonic and opticial techniques. [Internet] [Doctoral dissertation]. University of Southern California; 2017. [cited 2021 Mar 05].
Available from: http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll3/id/616089/rec/4254.
Council of Science Editors:
Ma T. Multi-modality intravascular imaging by combined use of
ultrasonic and opticial techniques. [Doctoral Dissertation]. University of Southern California; 2017. Available from: http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll3/id/616089/rec/4254
Georgia Tech
14.
Yoon, Heechul.
Combined laser, ultrasound, and elasticity imaging for comprehensive diagnosis of cancer.
Degree: PhD, Electrical and Computer Engineering, 2018, Georgia Tech
URL: http://hdl.handle.net/1853/62211
► As cancer is pathologically and biologically complex, identifying a variety of information on its morphology, functionality, molecular composition, and biomechanics is desired for precise and…
(more)
▼ As cancer is pathologically and biologically complex, identifying a variety of information on its morphology, functionality, molecular composition, and biomechanics is desired for precise and personalized diagnosis and treatment. Medical
ultrasound imaging is a relatively safe, cost-effective modality that provides a cross-sectional image of anatomy in real-time, but it suffers from low contrast and does not provide quantitative functional information on tissue for better detection and assessment of a suspicious lesion. To circumvent this limitation, researchers have introduced shear-wave elasticity
imaging, which noninvasively measures Young’s modulus of tissue, spectroscopic photoacoustic
imaging, which quantifies chromophores distribution in tissue, phase-change contrast agents, which are useful in
imaging extravascular targets, and super-resolution
imaging, which provides unprecedented spatial resolution beyond the diffraction limit for molecular
imaging. This research engineers these methods to further improve their respective
imaging capabilities. In addition, based on the improvements in each
imaging method, this research introduces combined laser,
ultrasound, and elasticity (CLUE)
imaging that is uniquely capable of simultaneous and synergistic probing of acoustic, optical, and mechanical
imaging contrast of tissue to provide comprehensive soft tissue assessment.
Advisors/Committee Members: Emelianov, Stanislav (advisor), Degertekin, F. Levent (committee member), Lindsey, Brooks (committee member), Inan, Omer (committee member), Arvanitis, Costas (committee member).
Subjects/Keywords: Ultrasound imaging; Shear-wave elasticity imaging; Photoacoustic imaging; Perfluorohexane nanodroplets; Contrast-enhanced ultrasound imaging; Comprehensive cancer diagnosis; Multi-modal imaging
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APA (6th Edition):
Yoon, H. (2018). Combined laser, ultrasound, and elasticity imaging for comprehensive diagnosis of cancer. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/62211
Chicago Manual of Style (16th Edition):
Yoon, Heechul. “Combined laser, ultrasound, and elasticity imaging for comprehensive diagnosis of cancer.” 2018. Doctoral Dissertation, Georgia Tech. Accessed March 05, 2021.
http://hdl.handle.net/1853/62211.
MLA Handbook (7th Edition):
Yoon, Heechul. “Combined laser, ultrasound, and elasticity imaging for comprehensive diagnosis of cancer.” 2018. Web. 05 Mar 2021.
Vancouver:
Yoon H. Combined laser, ultrasound, and elasticity imaging for comprehensive diagnosis of cancer. [Internet] [Doctoral dissertation]. Georgia Tech; 2018. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/1853/62211.
Council of Science Editors:
Yoon H. Combined laser, ultrasound, and elasticity imaging for comprehensive diagnosis of cancer. [Doctoral Dissertation]. Georgia Tech; 2018. Available from: http://hdl.handle.net/1853/62211
Texas A&M University
15.
Fazlulla Mohamed, Shakir.
Development of a Handheld Scanning Transducer Probe for Ultrasound Imaging.
Degree: MS, Electrical Engineering, 2015, Texas A&M University
URL: http://hdl.handle.net/1969.1/187440
► The scanning transducer technique is a simple and cost effective approach to achieve ultrasound imaging. By mechanically scanning a single-element transducer with a motor stage,…
(more)
▼ The scanning transducer technique is a simple and cost effective approach to achieve
ultrasound imaging. By mechanically scanning a single-element transducer with a motor stage, the time-variant
ultrasound field at an array of locations can be recorded for image reconstruction. When compared with the use of conventional transducer arrays, the scanning transducer approach requires much less data acquisition electronics. However, conventional x-y motor stages used for scanning the transducer are complex, bulky and slow. As a result, the scanning transducer technique for image acquisition has been mainly limited for lab use and is not suitable for handheld
imaging applications.
The goal of this research is to achieve a new 2-axis scanning transducer probe for handheld
ultrasound imaging operations, which is compact and light-weight. The approach is to develop and capitalize upon a miniaturized water-immersible 2-axis electromagnetic actuator to enable fast and agile scanning of a single-element transducer in a liquid filled probe case.
The design and fabrication of a water-immersible 2-axis electromagnetic actuator has been achieved and its mechanical scanning performance has been characterized and optimized with finite-element simulation. Preliminary pulse-echo
imaging experiments were performed to verify its
ultrasound imaging capability with scanning in B-scan mode in multiple directions. The scan system built can be dynamically reconfigured to either 1D- B-Scan or even 2D C-Scan formats for conventional 2D as well as 3D
ultrasound imaging. In addition, integrated optical light delivery with optic fiber cables was also investigated to extend its capability for photoacoustic
imaging.
Advisors/Committee Members: Zou, Jun (advisor), Kameoka, Jun (committee member), Righetti, Raffaella (committee member), Fang, Gwo-Ping (Alex) (committee member).
Subjects/Keywords: single transducer scanning; Ultrasound imaging; photoacoustic imaging; hand-held imaging probe
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APA (6th Edition):
Fazlulla Mohamed, S. (2015). Development of a Handheld Scanning Transducer Probe for Ultrasound Imaging. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/187440
Chicago Manual of Style (16th Edition):
Fazlulla Mohamed, Shakir. “Development of a Handheld Scanning Transducer Probe for Ultrasound Imaging.” 2015. Masters Thesis, Texas A&M University. Accessed March 05, 2021.
http://hdl.handle.net/1969.1/187440.
MLA Handbook (7th Edition):
Fazlulla Mohamed, Shakir. “Development of a Handheld Scanning Transducer Probe for Ultrasound Imaging.” 2015. Web. 05 Mar 2021.
Vancouver:
Fazlulla Mohamed S. Development of a Handheld Scanning Transducer Probe for Ultrasound Imaging. [Internet] [Masters thesis]. Texas A&M University; 2015. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/1969.1/187440.
Council of Science Editors:
Fazlulla Mohamed S. Development of a Handheld Scanning Transducer Probe for Ultrasound Imaging. [Masters Thesis]. Texas A&M University; 2015. Available from: http://hdl.handle.net/1969.1/187440
16.
Reddy, Vaka Narasimha.
Comparison and Optimization of Insonation Strategies for Contrast Enhanced Ultrasound Imaging.
Degree: The Institute of Technology, 2012, Linköping UniversityLinköping University
URL: http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-76646
► Evolution of vulnerable carotid plaques are crucial reason for cerebral ischemic strokes and identifying them in the early stage can become very important in…
(more)
▼ Evolution of vulnerable carotid plaques are crucial reason for cerebral ischemic strokes and identifying them in the early stage can become very important in avoiding the risk of stroke. In order to improve the identification and quantification accuracy of infancy plaques better visualization techniques are needed. Improving the visualization and quantification of neovascularization in carotid plaque using contrast enhanced ultrasound imaging still remains a challenging task. In this thesis work, three optimization techniques are proposed, which showed an improvement in the sensitivity of contrast agents when compared to the conventional clinical settings and insonation strategies. They are as follows:1) Insonation at harmonic specific (2nd harmonic) resonance frequency instead of resonance frequency based on maximum energy absorption provides enhanced nonlinear contribution.2) At high frequency ultrasound imaging, shorter pulse length will provide improved harmonic signal content when compared to longer pulse lengths. Applying this concept to multi- pulse sequencing (Pulse Inversion and Cadence contrast pulse sequencing) resulted in increased magnitude of the remaining harmonic signal after pulse summations.3) Peak negative pressure optimization of Pulse Inversion and Cadence contrast pulse sequencing was showed to further enhance the nonlinear content of the backscattered signal from contrast microbubbles without increasing the safety limits, defined by the mechanical index.The results presented in this thesis are based on computational modeling (Bubblesim software) and as a future continuation we plan to verify the simulation results with vitro studies.
Subjects/Keywords: Introduction to Medical Ultrasound; Ultrasound Contrast Agents; Ultrasound Contrast for Carotid Plaques; Contrast enhanced ultrasound imaging; Bubble Theory; Nonlinear imaging; Ultrasound imaging; Pulse inversion; Cadence contrast pulse sequence
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APA (6th Edition):
Reddy, V. N. (2012). Comparison and Optimization of Insonation Strategies for Contrast Enhanced Ultrasound Imaging. (Thesis). Linköping UniversityLinköping University. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-76646
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Reddy, Vaka Narasimha. “Comparison and Optimization of Insonation Strategies for Contrast Enhanced Ultrasound Imaging.” 2012. Thesis, Linköping UniversityLinköping University. Accessed March 05, 2021.
http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-76646.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Reddy, Vaka Narasimha. “Comparison and Optimization of Insonation Strategies for Contrast Enhanced Ultrasound Imaging.” 2012. Web. 05 Mar 2021.
Vancouver:
Reddy VN. Comparison and Optimization of Insonation Strategies for Contrast Enhanced Ultrasound Imaging. [Internet] [Thesis]. Linköping UniversityLinköping University; 2012. [cited 2021 Mar 05].
Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-76646.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Reddy VN. Comparison and Optimization of Insonation Strategies for Contrast Enhanced Ultrasound Imaging. [Thesis]. Linköping UniversityLinköping University; 2012. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-76646
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
San Jose State University
17.
Pourfathi, Mehrdad.
Ultrasound Strain Imaging Using Sector Arrays For Monitoring Prostate Ablation Therapy.
Degree: MS, Electrical Engineering, 2011, San Jose State University
URL: https://doi.org/10.31979/etd.dvcc-7uuv
;
https://scholarworks.sjsu.edu/etd_theses/4071
► Thermal ablation treatment is a relatively new method for prostate cancer therapy, where high energy focused ultrasound is used to thermally coagulate cancerous tissue.…
(more)
▼ Thermal ablation treatment is a relatively new method for prostate cancer therapy, where high energy focused ultrasound is used to thermally coagulate cancerous tissue. Thermal ablation is advantageous in comparison to other invasive treatment methods such as surgery, radiation therapy, or chemotherapy due to its minimally invasive nature. Currently, magnetic resonance thermal imaging (MRTI) is used to monitor the temperature distribution during the ablation treatment. However, MRTI is not only an expensive method, but it is also difficult to set up. Ultrasound strain imaging, on the other hand, has proven to be an effective method to detect and track lesion boundaries in soft tissues such as the liver and breast. Several strain-imaging algorithms have been developed, each one tailored for certain application and tissue geometry. In this thesis, we develop a new algorithm based on the cross-correlation method to potentially detect and track lesions during a prostate ablation treatment. In order to verify the performance of the algorithm and mimic the desired clinical scenario, we used three different ultrasound phantoms to verify the performance of the developed algorithm in terms of speed, resolution and accuracy. The results show that using the ultrasound data taken by a sector scanner, the algorithm can generate strain images with millimeter-order spatial resolution and enough contrast level to allow for detection of the lesion.
Subjects/Keywords: Elastography; Hyperthermia; Prostate Cancer; Strain Imaging; Ultrasound
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APA (6th Edition):
Pourfathi, M. (2011). Ultrasound Strain Imaging Using Sector Arrays For Monitoring Prostate Ablation Therapy. (Masters Thesis). San Jose State University. Retrieved from https://doi.org/10.31979/etd.dvcc-7uuv ; https://scholarworks.sjsu.edu/etd_theses/4071
Chicago Manual of Style (16th Edition):
Pourfathi, Mehrdad. “Ultrasound Strain Imaging Using Sector Arrays For Monitoring Prostate Ablation Therapy.” 2011. Masters Thesis, San Jose State University. Accessed March 05, 2021.
https://doi.org/10.31979/etd.dvcc-7uuv ; https://scholarworks.sjsu.edu/etd_theses/4071.
MLA Handbook (7th Edition):
Pourfathi, Mehrdad. “Ultrasound Strain Imaging Using Sector Arrays For Monitoring Prostate Ablation Therapy.” 2011. Web. 05 Mar 2021.
Vancouver:
Pourfathi M. Ultrasound Strain Imaging Using Sector Arrays For Monitoring Prostate Ablation Therapy. [Internet] [Masters thesis]. San Jose State University; 2011. [cited 2021 Mar 05].
Available from: https://doi.org/10.31979/etd.dvcc-7uuv ; https://scholarworks.sjsu.edu/etd_theses/4071.
Council of Science Editors:
Pourfathi M. Ultrasound Strain Imaging Using Sector Arrays For Monitoring Prostate Ablation Therapy. [Masters Thesis]. San Jose State University; 2011. Available from: https://doi.org/10.31979/etd.dvcc-7uuv ; https://scholarworks.sjsu.edu/etd_theses/4071
University of Utah
18.
Dillon, Christopher Reed.
Identifying parameters from the bioheat transfer equation using magnetic resonance-guided focused uotrasound.
Degree: PhD, Bioengineering, 2014, University of Utah
URL: http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/3186/rec/1287
► For magnetic resonance-guided focused ultrasound (MRgFUS) treatments to be broadly accepted, progress must be made in treatment planning, monitoring, and control. A key component to…
(more)
▼ For magnetic resonance-guided focused ultrasound (MRgFUS) treatments to be broadly accepted, progress must be made in treatment planning, monitoring, and control. A key component to this goal is accurate modeling of the bioheat transfer equation (BHTE). This dissertation develops new methods for identifying the significant parameters of the BHTE: the ultrasonic specific absorption rate (SAR), the tissue thermaldiffusivity, and perfusion-related energy losses. SAR is determined by fitting an analytical solution one-dimensional radial Gaussian heating) to MRgFUS temperature data in simulations and a tissue-mimicking phantom. This new method is compared with linear and exponential methods for different fitting times, beam sizes, perfusion, and thermal diffusivity values. The analytical method is consistently most reliable and is accurate to within 10% for all cases, except highperfusion. An extension to the analytical solution improves SAR estimates for high perfusion cases.MRgFUS sampling characteristics (spatial averaging, temporal sampling, and noise) for SAR and thermal diffusivity estimation are parametrically evaluated against several focused ultrasound beam sizes. For single point heatings, a maximum voxel size of1x1x3 mm is recommended for temperature and estimate errors to remain less than 10%. Two MRgFUS thermal diffusivity estimation methods are evaluated against a standard technique in ex vivo porcine and in vivo rabbit back muscle. Both methods accurately estimate thermal diffusivity using cooling data (overall ex vivo error < 6%, in vivo < 12%). Including heating data in the Gaussian SAR method further reduces errors(ex vivo error < 2%, in vivo < 3%). The Gaussian SAR method has better precision than the Gaussian temperature method.Two methods for quantifying perfusion-related energy losses using MRgFUS cooling temperatures are developed (experimental + modeled data vs. experimental data). The methods are verified via simulations and experiments in ex vivo perfused porcine kidney at different flow rates. The difference techniques employed make these methods susceptible to noise errors, but this feasibility study demonstrates promise for their use in future work.In conclusion, these methods can be used to validate biothermal models, and associated improvements in thermal modeling have the potential to increase the efficacy and safety of MRgFUS therapies.
Subjects/Keywords: Bioheat transfer; Focused ultrasound; Magnetic resonance imaging
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APA (6th Edition):
Dillon, C. R. (2014). Identifying parameters from the bioheat transfer equation using magnetic resonance-guided focused uotrasound. (Doctoral Dissertation). University of Utah. Retrieved from http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/3186/rec/1287
Chicago Manual of Style (16th Edition):
Dillon, Christopher Reed. “Identifying parameters from the bioheat transfer equation using magnetic resonance-guided focused uotrasound.” 2014. Doctoral Dissertation, University of Utah. Accessed March 05, 2021.
http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/3186/rec/1287.
MLA Handbook (7th Edition):
Dillon, Christopher Reed. “Identifying parameters from the bioheat transfer equation using magnetic resonance-guided focused uotrasound.” 2014. Web. 05 Mar 2021.
Vancouver:
Dillon CR. Identifying parameters from the bioheat transfer equation using magnetic resonance-guided focused uotrasound. [Internet] [Doctoral dissertation]. University of Utah; 2014. [cited 2021 Mar 05].
Available from: http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/3186/rec/1287.
Council of Science Editors:
Dillon CR. Identifying parameters from the bioheat transfer equation using magnetic resonance-guided focused uotrasound. [Doctoral Dissertation]. University of Utah; 2014. Available from: http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/3186/rec/1287
Georgia Tech
19.
Kubelick, Kelsey P.
Development of ultrasound and photoacoustic imaging tools for tracking of cells and particles.
Degree: PhD, Biomedical Engineering (Joint GT/Emory Department), 2019, Georgia Tech
URL: http://hdl.handle.net/1853/62722
► Development of novel therapies relies heavily on histology to evaluate outcomes. While histology provides detailed information at the molecular level, drawbacks include highly invasive, destructive…
(more)
▼ Development of novel therapies relies heavily on histology to evaluate outcomes. While histology provides detailed information at the molecular level, drawbacks include highly invasive, destructive sample preparation. To this end, clinical translation of novel therapies would be expedited by further developing minimally invasive, longitudinal
imaging methods to inform therapy design or provide clinical feedback. Combined
ultrasound (US) and photoacoustic (PA)
imaging augmented with contrast agents is an excellent option to address this need. This research describes development of a US/PA
imaging toolbox, consisting of contrast agents,
imaging protocols,
imaging hardware, and detection algorithms, that can be tailored for a variety of applications where longitudinal, in vivo
imaging of specific cells or particles is desired. To demonstrate versatility, these US/PA
imaging tools were developed and combined in different ways for implementation in three distinct applications: 1) stem cell monitoring in ophthalmology to aid development of glaucoma therapies; 2) intra- and post-operative monitoring to guide stem cell therapies of the spinal cord; and 3) monitoring particle trafficking to the lymph node to inform vaccine design. Although the applications investigated here were extremely different, common themes were identified, highlighting broad relevance of the US/PA
imaging toolbox and common opportunities for later development. Overall, the tools developed here lay the foundation for design of custom US/PA
imaging platforms in the future.
Advisors/Committee Members: Emelianov, Stanislav (advisor), Donnelly, Eleanor (committee member), Ethier, C. Ross (committee member), Garcia, Andres (committee member), Robles, Francisco (committee member), Roy, Krishnendu (committee member).
Subjects/Keywords: Ultrasound; Photoacoustic imaging; Nanoparticles; Stem cell tracking
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APA (6th Edition):
Kubelick, K. P. (2019). Development of ultrasound and photoacoustic imaging tools for tracking of cells and particles. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/62722
Chicago Manual of Style (16th Edition):
Kubelick, Kelsey P. “Development of ultrasound and photoacoustic imaging tools for tracking of cells and particles.” 2019. Doctoral Dissertation, Georgia Tech. Accessed March 05, 2021.
http://hdl.handle.net/1853/62722.
MLA Handbook (7th Edition):
Kubelick, Kelsey P. “Development of ultrasound and photoacoustic imaging tools for tracking of cells and particles.” 2019. Web. 05 Mar 2021.
Vancouver:
Kubelick KP. Development of ultrasound and photoacoustic imaging tools for tracking of cells and particles. [Internet] [Doctoral dissertation]. Georgia Tech; 2019. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/1853/62722.
Council of Science Editors:
Kubelick KP. Development of ultrasound and photoacoustic imaging tools for tracking of cells and particles. [Doctoral Dissertation]. Georgia Tech; 2019. Available from: http://hdl.handle.net/1853/62722
20.
Bergel, Antoine.
Cerebral vascular patterns associated with theta and gamma rhythms during unrestrained behavior and REM sleep : Réponses hémodynamiques cérébrales associées aux rythmes thêta et gamma lors du mouvement libre et du sommeil paradoxal.
Degree: Docteur es, Sciences de la vie. Neurosciences, 2016, Sorbonne Paris Cité
URL: http://www.theses.fr/2016USPCC239
► Le rythme thêta est un rythme cérébral associé à l’activité locomotrice et au sommeil paradoxal. Bien que son implication dans la communication entre régions du…
(more)
▼ Le rythme thêta est un rythme cérébral associé à l’activité locomotrice et au sommeil paradoxal. Bien que son implication dans la communication entre régions du cerveau et processus mnésiques ait largement été démontrée, il persiste un manque de données extensives dû à la difficulté d’imager l’ensemble de l’activité cérébrale dans des conditions naturelles de locomotion et d’exploration. Dans cette thèse, j’ai développé une approche qui combine l’enregistrement des potentiels de champs locaux à l’imagerie ultrasonore fonctionnelle (fUS) sur l’animal en mouvement libre. Pour la première fois, j’ai pu révéler les réponses hémodynamiques associées au rythme thêta dans la plupart des structures du système nerveux central avec de bonnes résolutions spatiale (100 x 100 x 400 μm) et temporelle (200 ms). Pendant la locomotion et le sommeil, les variations hémodynamiques de l’hippocampe, du thalamus dorsal et du cortex (rétrosplenial, somatosensoriel) corrèlent fortement avec la puissance instantanée du signal thêta hippocampique, avec un décalage temporel variant de 0.7 s à 2.0 s selon les structures. De manière intéressante, les rythmes gamma hippocampiques moyen (55-95 Hz) et rapide (100-150 Hz) expliquent la variance des signaux hémodynamiques mieux que le seul rythme thêta, alors que le rythme gamma lent (30-50 Hz) est non pertinent. L’hyperémie fonctionnelle de l’hippocampe suit séquentiellement la boucle tri-synaptique (gyrus denté - région CA3 - région CA1) et se renforce considérablement à mesure que la tâche progresse. Lors du sommeil paradoxal, j’ai observé une hyperémie tonique globale ainsi que des activations phasiques de grande amplitude initiées dans le thalamus et terminant dans les aires corticales, que nous avons appelées “poussées vasculaires”. De fortes bouffées d’activité gamma rapide (100-150 Hz) précèdent de manière robuste ces poussées vasculaires, l’inverse n’étant pas vrai. Dans l’ensemble, ces résultats révèlent la dynamique spatio-temporelle des signaux hémodynamiques associés à la locomotion et au sommeil paradoxal et suggèrent un lien fort entre rythmes thêta, gamma rapide et activité vasculaire globale
Theta rhythm is a prominent oscillatory pattern of EEG strongly associated with active locomotion and REM sleep. While it has been shown to play a crucial role in communication between brain areas and memory processes, there is a lack of extensive data due to the difficulty to image global brain activity during locomotion behavior. In this thesis, I developed an approach that combines local field potential recordings (LFP) and functional ultrasound imaging (fUS) to unrestrained rats. For the first time, I could image the hemodynamic responses associated with theta rhythm in most central nervous system (CNS) structures, with high spatial (100 x 100 x 400 μm) and temporal (200 ms) resolutions. During running and REM sleep, hemodynamic variations in the hippocampus, dorsal thalamus and cortices (S1BF, retrosplenial) correlated strongly with instantaneous theta power, with a delay ranging from 0.7…
Advisors/Committee Members: Cauli, Bruno (thesis director), Cohen, Ivan (thesis director).
Subjects/Keywords: Imagerie Ultrasonore Fonctionnelle; Functional Ultrasound Imaging
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APA (6th Edition):
Bergel, A. (2016). Cerebral vascular patterns associated with theta and gamma rhythms during unrestrained behavior and REM sleep : Réponses hémodynamiques cérébrales associées aux rythmes thêta et gamma lors du mouvement libre et du sommeil paradoxal. (Doctoral Dissertation). Sorbonne Paris Cité. Retrieved from http://www.theses.fr/2016USPCC239
Chicago Manual of Style (16th Edition):
Bergel, Antoine. “Cerebral vascular patterns associated with theta and gamma rhythms during unrestrained behavior and REM sleep : Réponses hémodynamiques cérébrales associées aux rythmes thêta et gamma lors du mouvement libre et du sommeil paradoxal.” 2016. Doctoral Dissertation, Sorbonne Paris Cité. Accessed March 05, 2021.
http://www.theses.fr/2016USPCC239.
MLA Handbook (7th Edition):
Bergel, Antoine. “Cerebral vascular patterns associated with theta and gamma rhythms during unrestrained behavior and REM sleep : Réponses hémodynamiques cérébrales associées aux rythmes thêta et gamma lors du mouvement libre et du sommeil paradoxal.” 2016. Web. 05 Mar 2021.
Vancouver:
Bergel A. Cerebral vascular patterns associated with theta and gamma rhythms during unrestrained behavior and REM sleep : Réponses hémodynamiques cérébrales associées aux rythmes thêta et gamma lors du mouvement libre et du sommeil paradoxal. [Internet] [Doctoral dissertation]. Sorbonne Paris Cité; 2016. [cited 2021 Mar 05].
Available from: http://www.theses.fr/2016USPCC239.
Council of Science Editors:
Bergel A. Cerebral vascular patterns associated with theta and gamma rhythms during unrestrained behavior and REM sleep : Réponses hémodynamiques cérébrales associées aux rythmes thêta et gamma lors du mouvement libre et du sommeil paradoxal. [Doctoral Dissertation]. Sorbonne Paris Cité; 2016. Available from: http://www.theses.fr/2016USPCC239
University of Toronto
21.
Jain, Devika Pearl.
Design of a Polymer Transducing Pad as a Replacement for Commercial Ultrasound Gel in Low-Income Countries and Resource-Scarce Settings.
Degree: 2018, University of Toronto
URL: http://hdl.handle.net/1807/97674
► A polymer pad has been formulated and tested to act as a conductive element between an ultrasound transducer and the human body during external ultrasound…
(more)
▼ A polymer pad has been formulated and tested to act as a conductive element between an ultrasound transducer and the human body during external ultrasound examinations. This pad acts as a replacement for commercially-available ultrasound gel, which is often difficult to acquire in low-income, resource-scarce, geographically inaccessible, and conflict areas, in addition to any type of zone with disrupted distribution channels for medical equipment. As ultrasound examinations are safe, portable, and relatively affordable, they are an important diagnostic imaging tool; a lack of ultrasound gel hinders the use of this technology.
This polymer pad replaces the need for commercial ultrasound gel. It is composed of 4 chemical component groups: a divinyl backbone, acrylic acid and acrylate monomers, and an oligomeric poly(ethylene glycol). Certain formulations of this polymer pad can be used to produce ultrasound images that are comparable to those acquired using ultrasound gel and suggest prolonged reusability.
M.H.Sc.
2019-11-15 00:00:00
Advisors/Committee Members: Santerre, J. Paul, Salmon, Margaret, Biomedical Engineering.
Subjects/Keywords: absorbent polymer; couplant; hydrogel; ultrasound imaging; 0541
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APA (6th Edition):
Jain, D. P. (2018). Design of a Polymer Transducing Pad as a Replacement for Commercial Ultrasound Gel in Low-Income Countries and Resource-Scarce Settings. (Masters Thesis). University of Toronto. Retrieved from http://hdl.handle.net/1807/97674
Chicago Manual of Style (16th Edition):
Jain, Devika Pearl. “Design of a Polymer Transducing Pad as a Replacement for Commercial Ultrasound Gel in Low-Income Countries and Resource-Scarce Settings.” 2018. Masters Thesis, University of Toronto. Accessed March 05, 2021.
http://hdl.handle.net/1807/97674.
MLA Handbook (7th Edition):
Jain, Devika Pearl. “Design of a Polymer Transducing Pad as a Replacement for Commercial Ultrasound Gel in Low-Income Countries and Resource-Scarce Settings.” 2018. Web. 05 Mar 2021.
Vancouver:
Jain DP. Design of a Polymer Transducing Pad as a Replacement for Commercial Ultrasound Gel in Low-Income Countries and Resource-Scarce Settings. [Internet] [Masters thesis]. University of Toronto; 2018. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/1807/97674.
Council of Science Editors:
Jain DP. Design of a Polymer Transducing Pad as a Replacement for Commercial Ultrasound Gel in Low-Income Countries and Resource-Scarce Settings. [Masters Thesis]. University of Toronto; 2018. Available from: http://hdl.handle.net/1807/97674
Delft University of Technology
22.
Li, Xuyang (author).
Semi-Controllable Compression Schemes for Ultrasound Imaging.
Degree: 2017, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:5c60b296-5a0c-4d7a-b3fe-8cd3aca0b7ef
► The application of Compressive Sampling (CS) in the medical ultrasound has been widely studied in recent years with the growing requirement of reconstructing high-quality images…
(more)
▼ The application of Compressive Sampling (CS) in the medical
ultrasound has been widely studied in recent years with the growing requirement of reconstructing high-quality images with smaller data size. Most of the current studies with successful CS reconstruction are mainly focusing on the mathematical applications of CS theory in
ultrasound imaging. However, the randomized mechanisms in these studies are hard to be fully fulfilled in hardware. In addition, some of the studies try to discover the sparse representation of signals by ignoring a part of information rather than compressing all data. We propose a new compression scheme for fast image acquisition in
ultrasound imaging using a method, which is similar in style to CS. Our scheme is based on the formulation of an inverse scattering problem (ISP), where the Born approximation have been used during its derivation. In our system, the
ultrasound image are represented by a collection of hypothetical points, what can be called pixels. These points are identified by their unique spatial impulse responses relative to the elements in the transducer. The randomized linear combinations of the spatial impulse responses from the view of elements can be maintained the uniquenesses of these points, which is similar to the coding techniques in data compression. Hence, our compression scheme can be more controllable than the conventional CS, which can achieve the real-time compression of data during the acquisition stage in hardware. We employ L2-regularization to solve the ill-posed ISP rather than the L1-regularization CS since there is no any assumption of signal sparsity. In our work, we finally achieve the acceptable reconstructions by compressing the raw data to 12.5% of its original size. The results are better than 12.5% with multiplexing the received signals from 12.5% elements in the array and almost as good as 25% with multiplexing the received signals from 25% elements in the array.
Advisors/Committee Members: Leus, Geert (mentor), Pertijs, Michiel (graduation committee), Kruizinga, Pieter (graduation committee), van der Meulen, Pim (graduation committee), Delft University of Technology (degree granting institution).
Subjects/Keywords: compressive sampling; ultrasound imaging; semi-controllable
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APA (6th Edition):
Li, X. (. (2017). Semi-Controllable Compression Schemes for Ultrasound Imaging. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:5c60b296-5a0c-4d7a-b3fe-8cd3aca0b7ef
Chicago Manual of Style (16th Edition):
Li, Xuyang (author). “Semi-Controllable Compression Schemes for Ultrasound Imaging.” 2017. Masters Thesis, Delft University of Technology. Accessed March 05, 2021.
http://resolver.tudelft.nl/uuid:5c60b296-5a0c-4d7a-b3fe-8cd3aca0b7ef.
MLA Handbook (7th Edition):
Li, Xuyang (author). “Semi-Controllable Compression Schemes for Ultrasound Imaging.” 2017. Web. 05 Mar 2021.
Vancouver:
Li X(. Semi-Controllable Compression Schemes for Ultrasound Imaging. [Internet] [Masters thesis]. Delft University of Technology; 2017. [cited 2021 Mar 05].
Available from: http://resolver.tudelft.nl/uuid:5c60b296-5a0c-4d7a-b3fe-8cd3aca0b7ef.
Council of Science Editors:
Li X(. Semi-Controllable Compression Schemes for Ultrasound Imaging. [Masters Thesis]. Delft University of Technology; 2017. Available from: http://resolver.tudelft.nl/uuid:5c60b296-5a0c-4d7a-b3fe-8cd3aca0b7ef
University of Toronto
23.
Aly, Al-Hassan.
Ultrasound Imaging of Bone for Spinal Fusion Surgery Guidance: Simulation and Experimental Results.
Degree: 2010, University of Toronto
URL: http://hdl.handle.net/1807/24233
► In order to continue development of an ultrasound-guidance system for spinal fusion surgery, simulation and experimental research was conducted to study the effects of bone…
(more)
▼ In order to continue development of an ultrasound-guidance system for spinal
fusion surgery, simulation and experimental research was conducted to study the effects
of bone on ultrasound imaging. Simulation work examined the effect of bone volume and
transducer frequency on image quality and accuracy. Experimental work utilized a
3.2MHz prototype ultrasound probe to create ultrasound images of pedicles. The
simulation results, based on an idealized anatomical model, provided higher-quality
images than the experimental results. It was determined that high bone volume and high
transducer frequency have a detrimental effect on image quality. The experimental results suggest that the high variability in pedicle shape results in variability in ultrasound image quality. Overall, the simulation and experimental results suggest that ultrasound imaging of bone is feasible at relatively low frequencies, while highlighting the need for more
experiments to take into account the substantial variability in pedicle shape and bone volume.
MAST
Advisors/Committee Members: Cobbold, Richard, Ginsberg, Howard, Biomedical Engineering.
Subjects/Keywords: ultrasound; imaging; bone; spinal fusion; 0541
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APA (6th Edition):
Aly, A. (2010). Ultrasound Imaging of Bone for Spinal Fusion Surgery Guidance: Simulation and Experimental Results. (Masters Thesis). University of Toronto. Retrieved from http://hdl.handle.net/1807/24233
Chicago Manual of Style (16th Edition):
Aly, Al-Hassan. “Ultrasound Imaging of Bone for Spinal Fusion Surgery Guidance: Simulation and Experimental Results.” 2010. Masters Thesis, University of Toronto. Accessed March 05, 2021.
http://hdl.handle.net/1807/24233.
MLA Handbook (7th Edition):
Aly, Al-Hassan. “Ultrasound Imaging of Bone for Spinal Fusion Surgery Guidance: Simulation and Experimental Results.” 2010. Web. 05 Mar 2021.
Vancouver:
Aly A. Ultrasound Imaging of Bone for Spinal Fusion Surgery Guidance: Simulation and Experimental Results. [Internet] [Masters thesis]. University of Toronto; 2010. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/1807/24233.
Council of Science Editors:
Aly A. Ultrasound Imaging of Bone for Spinal Fusion Surgery Guidance: Simulation and Experimental Results. [Masters Thesis]. University of Toronto; 2010. Available from: http://hdl.handle.net/1807/24233
Queen Mary, University of London
24.
Kelly, Stephen Gerard.
Ultrasound imaging of synovitis : relationship to pathobiology and response to therapy.
Degree: PhD, 2014, Queen Mary, University of London
URL: http://qmro.qmul.ac.uk/xmlui/handle/123456789/9010
;
https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.667367
► Ultrasound (US) imaging has made significant progress over the past 20 years in relation to its role in inflammatory arthritis, and in particular, Rheumatoid Arthritis.…
(more)
▼ Ultrasound (US) imaging has made significant progress over the past 20 years in relation to its role in inflammatory arthritis, and in particular, Rheumatoid Arthritis. Modern US machines provide crisp, detailed images of superficial anatomical structures which has facilitated the uptake of US imaging as an important assessment tool within the Rheumatology department. Diagnostic and prognostic information can now assist clinicians decisions with the goal of improving patient treatment and subsequent outcome. In addition, 3D US imaging has recently been suggested as an additional imaging modality with potential benefits in the assessment of in?ammatory arthritis. Recent work has focused on providing a reliable, responsive US joint count which can be assimilated into routine care as well as providing a platform for clinical research. Thus, my first aim was to show that a defined limited US data set, including 2D and 3D imaging, shows acceptable reliability. I demonstrate that both imaging modalities are reliable in terms of reading and image acquisition when restricted to a limited US data set. My second aim, was to demonstrate that a limited US data set is responsive. Using both a physiological and pharmacological trigger, I demonstrate that both 2D and 3D imaging are responsive and that combining US endpoints with DAS28 (Disease Activity Score - 28) increased the effect size and identifies treatment effects early. Despite notable advances in musculoskeletal US research, there is still need for better understanding of the pathophysiological correlates of ultrasound imaging. Therefore my final aim was to examine the relationship of Power Doppler Signal (PDS) and gray-scale synovial thickening with histological features of synovitis at a single joint level and with an extended joint US data set. I Firstly show that the harvesting of synovial tissue, using a minimally invasive US-guided biopsy technique, is safe and well tolerated by patients and that the quality of tissue and RNA extracted is good. Using this tissue collection method, I demonstrate a good correlation of US and histological parameters of synovitis (specifically CD68+ sub-lining macrophages) at a single joint level, in both an early and established RA cohort. This relationship is maintained if the US assessment is extended to a discrete US joint data set. Furthermore, within the knee joint I demonstrated that PDS correlates well with synovial tissue expression of inflammatory mediators of neoangiogenesis and histological assessment of synovial vascular area.
Subjects/Keywords: 616.7; Medicine; Ultrasound imaging; Rheumatoid arthritis; Rheumatology
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APA (6th Edition):
Kelly, S. G. (2014). Ultrasound imaging of synovitis : relationship to pathobiology and response to therapy. (Doctoral Dissertation). Queen Mary, University of London. Retrieved from http://qmro.qmul.ac.uk/xmlui/handle/123456789/9010 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.667367
Chicago Manual of Style (16th Edition):
Kelly, Stephen Gerard. “Ultrasound imaging of synovitis : relationship to pathobiology and response to therapy.” 2014. Doctoral Dissertation, Queen Mary, University of London. Accessed March 05, 2021.
http://qmro.qmul.ac.uk/xmlui/handle/123456789/9010 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.667367.
MLA Handbook (7th Edition):
Kelly, Stephen Gerard. “Ultrasound imaging of synovitis : relationship to pathobiology and response to therapy.” 2014. Web. 05 Mar 2021.
Vancouver:
Kelly SG. Ultrasound imaging of synovitis : relationship to pathobiology and response to therapy. [Internet] [Doctoral dissertation]. Queen Mary, University of London; 2014. [cited 2021 Mar 05].
Available from: http://qmro.qmul.ac.uk/xmlui/handle/123456789/9010 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.667367.
Council of Science Editors:
Kelly SG. Ultrasound imaging of synovitis : relationship to pathobiology and response to therapy. [Doctoral Dissertation]. Queen Mary, University of London; 2014. Available from: http://qmro.qmul.ac.uk/xmlui/handle/123456789/9010 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.667367
University of Victoria
25.
Albulayli, Mohammed.
Migration-based image reconstruction methods for plane-wave ultrasound imaging.
Degree: Department of Electrical and Computer Engineering, 2018, University of Victoria
URL: https://dspace.library.uvic.ca//handle/1828/9879
► Ultrasound imaging plays an important role in biomedical diagnostics due its safety, noninvasive nature, and low cost. Conventional ultrasound systems typically form an image frame…
(more)
▼ Ultrasound imaging plays an important role in biomedical diagnostics due its safety, noninvasive nature, and low cost. Conventional
ultrasound systems typically form an image frame by scanning the region of interest line-by-line, using a focused beam during transmission and dynamic focusing during reception. Alternatively, the region of interest can be insonified at once using a plane wave, which allows for ultrafast data acquisition rates but reduces the resulting image quality. The latter can be improved by means of coherent plane-wave compounding (CPWC), whereby multiple plane waves are emitted at different angles to obtain multiple image datasets that are subsequently combined to enhance the final compounded image.
We present two novel Fourier-domain techniques for CPWC image reconstruction from raw linear-array sensor data. In particular, we show how to modify two classic algorithms used for geophysical data processing, namely Stolt's and slant-stack depth migration under zero-offset constant-velocity assumptions, so that their new versions become applicable to plane-wave
ultrasound data processing. To demonstrate the merits and limitations of our approach, we provide qualitative and quantitative comparisons with other Fourier-domain methods reported in the
ultrasound literature. Our evaluation results are based on the image resolution, contrast, and similarity metrics obtained for several public-domain experimental benchmark datasets.
We also describe another novel Fourier-domain method for CPWC image reconstruction that can be used in situations where the speed of sound varies with depth in a layered propagation medium. Our technique builds on Gazdag's phase-shift migration algorithm that has been modified to handle plane-wave
ultrasound data processing. Our simulation results show that the proposed method is capable of accurately
imaging point targets in a three-layer medium, mimicking tissue-bone-tissue
ultrasound propagation.
Advisors/Committee Members: Rakhmatov, Daler N. (supervisor).
Subjects/Keywords: Ultrasound imaging; biomedical diagnostics; CPWC image reconstruction
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APA (6th Edition):
Albulayli, M. (2018). Migration-based image reconstruction methods for plane-wave ultrasound imaging. (Thesis). University of Victoria. Retrieved from https://dspace.library.uvic.ca//handle/1828/9879
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Albulayli, Mohammed. “Migration-based image reconstruction methods for plane-wave ultrasound imaging.” 2018. Thesis, University of Victoria. Accessed March 05, 2021.
https://dspace.library.uvic.ca//handle/1828/9879.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Albulayli, Mohammed. “Migration-based image reconstruction methods for plane-wave ultrasound imaging.” 2018. Web. 05 Mar 2021.
Vancouver:
Albulayli M. Migration-based image reconstruction methods for plane-wave ultrasound imaging. [Internet] [Thesis]. University of Victoria; 2018. [cited 2021 Mar 05].
Available from: https://dspace.library.uvic.ca//handle/1828/9879.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Albulayli M. Migration-based image reconstruction methods for plane-wave ultrasound imaging. [Thesis]. University of Victoria; 2018. Available from: https://dspace.library.uvic.ca//handle/1828/9879
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
26.
Smith, Brendon.
Effects of nutrition and ultrasound imaging on the cardiovascular system.
Degree: PhD, 0191, 2015, University of Illinois – Urbana-Champaign
URL: http://hdl.handle.net/2142/72961
► The work described in this dissertation is focused on two major areas: the biological effects of ultrasound and ultrasound contrast agents, and nutritional interventions to…
(more)
▼ The work described in this dissertation is focused on two major areas: the biological effects of
ultrasound and
ultrasound contrast agents, and nutritional interventions to inhibit the development of atherosclerosis.
Ultrasound is a highly flexible and affordable
imaging modality that has proven clinically useful in many diagnostic situations ranging from pregnancy to cardiovascular disease and cancer.
Ultrasound imaging can be performed with concomitant intravenous administration of microbubble contrast agents to improve image clarity. While useful for
imaging of the cardiovascular system, concerns have been raised regarding the safety of
ultrasound contrast agents, and further research is needed to determine their biological effects. This work investigates interactions between
ultrasound, microbubbles, and the vascular endothelium, the inner cellular lining of blood vessels. The goal of this research is to help define the specific conditions under which contrast
ultrasound is safe so that this knowledge can be applied to clinical patient care and diagnosis. A series of four studies were conducted to evaluate the effects of
ultrasound and
ultrasound contrast agents (Chapters 3-6). First,
ultrasound imaging was performed on rabbit arteries, and histological and biochemical analyses were used to determine any effects on the tissue being imaged. As part of this project, an assay was developed and validated for measurement of one of the biomarkers, von Willebrand Factor (Chapter 2). Effects of contrast
ultrasound on von Willebrand Factor and atheroma thickness were observed. Next, another rabbit study was performed to assess the effect of contrast
ultrasound on Hsp70, a cellular stress protein. The
ultrasound procedure was hypothesized to elevate Hsp70 protein levels. Hsp70 protein levels were measured in aorta tissue at the site of
ultrasound exposure by Western blot.
Ultrasound with contrast agent did not affect Hsp70 levels (Chapter 4). In addition to rabbits, work with ApoE-/- mice and rats will be described. We did not observe any adverse effects of
ultrasound in these models (Chapters 5 and 6).
We also studied the effects of tomato and soy germ on atherosclerosis in ApoE-/- mice (Chapter 7). We did not find that tomato and soy germ decreased atherosclerosis, but soy germ consumption favorably affected plasma and tissue lipid accumulation.
Advisors/Committee Members: O'Brien, William, Jr. (advisor), Erdman, John, Jr. (advisor), Johnson, Rodney W. (Committee Chair), O'Brien, William, Jr. (committee member), Erdman Jr., John (committee member), Wilund, Kenneth R. (committee member).
Subjects/Keywords: Atherosclerosis; Ultrasound; Imaging; Nutrition; Tomatoes; Soy
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APA (6th Edition):
Smith, B. (2015). Effects of nutrition and ultrasound imaging on the cardiovascular system. (Doctoral Dissertation). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/72961
Chicago Manual of Style (16th Edition):
Smith, Brendon. “Effects of nutrition and ultrasound imaging on the cardiovascular system.” 2015. Doctoral Dissertation, University of Illinois – Urbana-Champaign. Accessed March 05, 2021.
http://hdl.handle.net/2142/72961.
MLA Handbook (7th Edition):
Smith, Brendon. “Effects of nutrition and ultrasound imaging on the cardiovascular system.” 2015. Web. 05 Mar 2021.
Vancouver:
Smith B. Effects of nutrition and ultrasound imaging on the cardiovascular system. [Internet] [Doctoral dissertation]. University of Illinois – Urbana-Champaign; 2015. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/2142/72961.
Council of Science Editors:
Smith B. Effects of nutrition and ultrasound imaging on the cardiovascular system. [Doctoral Dissertation]. University of Illinois – Urbana-Champaign; 2015. Available from: http://hdl.handle.net/2142/72961
University of Minnesota
27.
Vilanguppam Thathachary, Supriya.
A Single-Element Fiber Transducer for All-Optical Ultrasound and Photoacoustic Sensing.
Degree: PhD, Biomedical Engineering, 2019, University of Minnesota
URL: http://hdl.handle.net/11299/211814
► The past few decades have seen a rapid rise in minimally invasive medical procedures performed around the globe. These procedures have been made possible largely…
(more)
▼ The past few decades have seen a rapid rise in minimally invasive medical procedures performed around the globe. These procedures have been made possible largely because of innovations in medical imaging and sensing to guide physicians in performing the interventions safely. Ultrasound technology has remained highly popular through this transition due to its safety and efficacy. However, the demand for miniature flexible devices for increased accessibility has prompted a shift toward all-optical ultrasound devices. Additionally, photoacoustic imaging and sensing have emerged as a promising technology with abilities to enhance diagnostic capabilities in several clinical applications, most significantly in the imaging of atherosclerotic plaque. The Fabry-perot ultrasound detector, being one of the more widespread optical ultrasound detection technologies, has been explored significantly in this context. This thesis presents a novel wave-guided configuration for fiber Fabry-Perot ultrasound detectors. This work demonstrates 16 times higher sensitivity than traditional piezoelelectric technology at comparable size scales. The chapters that follow present the simulations and experiments conducted around (a) optimizing the fabrication of the wave-guided fiber Fabry-Perot devices, (b) the complete optical and acoustic characterization of the fabricated devices, and (c) the potential improvements that can be made with incorporating dielectric mirrors. The thesis concludes with a discussion on the possible configurations for creating a complete ultrasound and photoacoustic probe for guiding minimally invasive interventions.
Subjects/Keywords: Fabry-Perot; Imaging; Intravascular; Sensing; Ultrasound; Waveguide
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APA (6th Edition):
Vilanguppam Thathachary, S. (2019). A Single-Element Fiber Transducer for All-Optical Ultrasound and Photoacoustic Sensing. (Doctoral Dissertation). University of Minnesota. Retrieved from http://hdl.handle.net/11299/211814
Chicago Manual of Style (16th Edition):
Vilanguppam Thathachary, Supriya. “A Single-Element Fiber Transducer for All-Optical Ultrasound and Photoacoustic Sensing.” 2019. Doctoral Dissertation, University of Minnesota. Accessed March 05, 2021.
http://hdl.handle.net/11299/211814.
MLA Handbook (7th Edition):
Vilanguppam Thathachary, Supriya. “A Single-Element Fiber Transducer for All-Optical Ultrasound and Photoacoustic Sensing.” 2019. Web. 05 Mar 2021.
Vancouver:
Vilanguppam Thathachary S. A Single-Element Fiber Transducer for All-Optical Ultrasound and Photoacoustic Sensing. [Internet] [Doctoral dissertation]. University of Minnesota; 2019. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/11299/211814.
Council of Science Editors:
Vilanguppam Thathachary S. A Single-Element Fiber Transducer for All-Optical Ultrasound and Photoacoustic Sensing. [Doctoral Dissertation]. University of Minnesota; 2019. Available from: http://hdl.handle.net/11299/211814
28.
Ouellette, Andrew.
Analysis of the Effect of Thermal Gradients on the Real-time 2D Imaging of the Spot Weld Process.
Degree: MS, Physics, 2015, University of Windsor
URL: https://scholar.uwindsor.ca/etd/5317
► Many monitoring processes have been proposed for the spot weld process, but most of these techniques involve the use of post weld verification methods.…
(more)
▼ Many monitoring processes have been proposed for the spot weld process, but most of these techniques involve the use of post weld verification methods. An ultrasonic phased array has been shown to be a viable method for the monitoring the spot weld in 2D, however the presence of thermal gradients generated during the welding process can result in a loss of resolution and accuracy within the image. In this report these effects were investigated and the device’s
imaging ability improved. It was found that the
imaging abilities of the device are not severely degraded and that a 0.9 mm resolution is attainable using a 10 MHz phased array. Additionally the maximum 0.2 mm offset of the focused wave generated by heating was found to be correctable by monitoring of the copper water boundary. These results indicate that good potential exists in the future applications of this device.
Advisors/Committee Members: Maev, Roman.
Subjects/Keywords: Acoustic; Gradients; Imaging; Modelling; Ultrasound; Weld
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APA (6th Edition):
Ouellette, A. (2015). Analysis of the Effect of Thermal Gradients on the Real-time 2D Imaging of the Spot Weld Process. (Masters Thesis). University of Windsor. Retrieved from https://scholar.uwindsor.ca/etd/5317
Chicago Manual of Style (16th Edition):
Ouellette, Andrew. “Analysis of the Effect of Thermal Gradients on the Real-time 2D Imaging of the Spot Weld Process.” 2015. Masters Thesis, University of Windsor. Accessed March 05, 2021.
https://scholar.uwindsor.ca/etd/5317.
MLA Handbook (7th Edition):
Ouellette, Andrew. “Analysis of the Effect of Thermal Gradients on the Real-time 2D Imaging of the Spot Weld Process.” 2015. Web. 05 Mar 2021.
Vancouver:
Ouellette A. Analysis of the Effect of Thermal Gradients on the Real-time 2D Imaging of the Spot Weld Process. [Internet] [Masters thesis]. University of Windsor; 2015. [cited 2021 Mar 05].
Available from: https://scholar.uwindsor.ca/etd/5317.
Council of Science Editors:
Ouellette A. Analysis of the Effect of Thermal Gradients on the Real-time 2D Imaging of the Spot Weld Process. [Masters Thesis]. University of Windsor; 2015. Available from: https://scholar.uwindsor.ca/etd/5317
University of Southern California
29.
Zheng, Fan.
High frequency ultrasonic phased array system and its
applications.
Degree: PhD, Biomedical Engineering, 2012, University of Southern California
URL: http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll3/id/109547/rec/3170
► While similar to a linear-switched array in structure, an ultrasound linear phased array (simply called phased array) is quite different in operation. It is capable…
(more)
▼ While similar to a linear-switched array in structure,
an
ultrasound linear phased array (simply called phased array) is
quite different in operation. It is capable of beam steering to
form fan-shaped sector images without inducing grating lobes.
Moreover, the relative smaller array footprint is useful where only
very limited contact surface is permitted. High frequency phased
arrays combine the advantages of the phased array and high
frequency
ultrasound, which offer both small footprint and high
spatial resolution. This dissertation reports the design and
development of a digital ultrasonic
imaging platform with raw RF
data acquisition capability, which can be paired with a prototype
64-element 26 MHz phased array transducer. A wire phantom image
showed that -6 dB lateral and axial resolutions were 209 and 104
μm, respectively, which were in good agreement with the Field II
simulation. Anechoic cyst tissue-mimicking phantom images
demonstrated its capability to detect cysts of 300 μm in diameter.
An image of a rabbit eyeball in vitro was also acquired. This
imaging platform is designed for the purpose of testing high
frequency phased arrays under development as well as facilitating
the development in novel array signal processing algorithms. ❧
Without additional change in the system hardware, the current high
frequency array system can be also applied in the industrial
non-destructive testing (NDT) applications. A motorized XY stage
allows the array system to acquire C-mode scan as well as normal
B-mode scan with bigger scanning area. Electronic scanning in array
system could dramatically reduce the total scanning time compare to
single element system. An aluminum sample and a silicon carbide
sample were examined to test the system in non-destructive testing.
❧ Besides the applications in biomedical
imaging and
non-destructive testing, the high frequency ultrasonic phased array
and system are shown to be capable of trapping and translating
microparticles precisely and efficiently, made possible due to the
fact that the acoustic beam produced by a phased array can be both
focused and steered. Acoustic manipulation of microparticles by a
phased array is advantageous over a single element transducer since
there is no mechanical movement required for the array.
Experimental results show that 45 μm diameter polystyrene
microspheres can be easily and accurately trapped and moved to
desired positions by a 64-element 26 MHz phased
array.
Advisors/Committee Members: Shung, Kirk Koping (Committee Chair), Yen, Jesse T. (Committee Member), Kim, Eun Sok (Committee Member), Zhou, Qifa (Committee Member).
Subjects/Keywords: high frequency; ultrasound; phased array; imaging system
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APA ·
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APA (6th Edition):
Zheng, F. (2012). High frequency ultrasonic phased array system and its
applications. (Doctoral Dissertation). University of Southern California. Retrieved from http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll3/id/109547/rec/3170
Chicago Manual of Style (16th Edition):
Zheng, Fan. “High frequency ultrasonic phased array system and its
applications.” 2012. Doctoral Dissertation, University of Southern California. Accessed March 05, 2021.
http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll3/id/109547/rec/3170.
MLA Handbook (7th Edition):
Zheng, Fan. “High frequency ultrasonic phased array system and its
applications.” 2012. Web. 05 Mar 2021.
Vancouver:
Zheng F. High frequency ultrasonic phased array system and its
applications. [Internet] [Doctoral dissertation]. University of Southern California; 2012. [cited 2021 Mar 05].
Available from: http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll3/id/109547/rec/3170.
Council of Science Editors:
Zheng F. High frequency ultrasonic phased array system and its
applications. [Doctoral Dissertation]. University of Southern California; 2012. Available from: http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll3/id/109547/rec/3170
University of Southern California
30.
Park, Jinhyoung.
High frequency chirp coded excitation ultrasound imaging
system.
Degree: PhD, Biomedical Engineering, 2011, University of Southern California
URL: http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll127/id/664082/rec/3169
► An increase of imaging frequency enhances the performance in spatial resolution of an ultrasound scanner while sacrificing echo signal to noise ratio (eSNR) because of…
(more)
▼ An increase of
imaging frequency enhances the
performance in spatial resolution of an
ultrasound scanner while
sacrificing echo signal to noise ratio (eSNR) because of a rise in
the amount of attenuation. As solutions to raise the eSNR level
while maintaining the enhanced spatial resolution, both fundamental
and harmonic coded excitation
imaging methods have been proposed.
For this purpose,
ultrasound bio-microscopes (UBM) capable of chirp
coded excitations were implemented on both a linear and a sector
mechanical scanning system. A custom-designed broadband (5 MHz –
140 MHz) linear power amplifier was designed as a part of a low
noise arbitrary pulse generator to replace a commercial bench-top
power amplifier in the linear UBM. The modified
imaging system
exhibited a better eSNR of 7 dB than the system with a commercial
power amplifier while maintaining the spatial resolution in a wire
target measurement. In-vivo
imaging was carried on pig eye and
zebrafish embryo using a 40 MHz and a 100 MHz single element
transducer respectively. For high frame rate coded excitation
imaging, a standalone frontend system for a sector UBM was
implemented. The custom-designed system consisting of a
transmitter, a receiver, a motor controller and a motor position
interpreter achieved an eSNR of 66 dB utilizing chirp coded
excitation for wire target
imaging. Moreover, contrast to noise
ratio (CNR) was improved from 2.92 to 3.18 with coded excitation.
This modified scanner allowed contraction of cardiac chambers of
both zebrafish and mouse hearts to be clearly visualized. As an
effort to enhance the spatial resolution, pulse inversion chirp
coded tissue harmonic
imaging (PI-CTHI) was programmed into the
custom-designed frontend system. In a wire target study using a 40
MHz single element transducer, lateral resolution was found to be
110 μm, which was narrower than fundamental
imaging at153 μm. CNR
was found to improve by 34 % when chirp coded excitation was
applied to harmonic
imaging. This
imaging mode was shown to better
delineate the clot formation in adult zebrafish heart
imaging when
the heart was amputated and allowed to regenerate.
Advisors/Committee Members: Yen, Jesse T.Hsiai, Tzung K.Kuo, C.-C. JayShung, K. Kirk (Committee Chair).
Subjects/Keywords: high frequency ultrasound imaging; chirp coded excitation
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APA ·
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APA (6th Edition):
Park, J. (2011). High frequency chirp coded excitation ultrasound imaging
system. (Doctoral Dissertation). University of Southern California. Retrieved from http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll127/id/664082/rec/3169
Chicago Manual of Style (16th Edition):
Park, Jinhyoung. “High frequency chirp coded excitation ultrasound imaging
system.” 2011. Doctoral Dissertation, University of Southern California. Accessed March 05, 2021.
http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll127/id/664082/rec/3169.
MLA Handbook (7th Edition):
Park, Jinhyoung. “High frequency chirp coded excitation ultrasound imaging
system.” 2011. Web. 05 Mar 2021.
Vancouver:
Park J. High frequency chirp coded excitation ultrasound imaging
system. [Internet] [Doctoral dissertation]. University of Southern California; 2011. [cited 2021 Mar 05].
Available from: http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll127/id/664082/rec/3169.
Council of Science Editors:
Park J. High frequency chirp coded excitation ultrasound imaging
system. [Doctoral Dissertation]. University of Southern California; 2011. Available from: http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll127/id/664082/rec/3169
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Open Access Theses and Dissertations
