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You searched for subject:(Intra operative imaging). Showing records 1 – 3 of 3 total matches.

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Freie Universität Berlin

1. Spranger, Nikolai. Influence of intra-operative 3D imaging on functional outcomes and health- related quality of life after open reduction and internal stabilization of intra-articular calcaneal fractures.

Degree: 2014, Freie Universität Berlin

Intra-operative 3D imaging allows for immediate correction of unacceptable results during ORIF of displaced calcaneal fractures. Yet, this technical advantage may not consistently translate into added value by means of better function or health-related quality of life. This paradoxical finding can be explained by both limitations of the present study design and ceiling effects of current surgical care. The gap between proven effectiveness of 3D imaging technology and efficiency, that is, the lacking influence on patient-centered outcomes, warrants prospective studies on a larger scale. Advisors/Committee Members: [email protected] (contact), m (gender), n.n. (firstReferee), n.n. (furtherReferee).

Subjects/Keywords: intra-operative 3D imaging; calcaneus; functional outcome; 600 Technik, Medizin, angewandte Wissenschaften::610 Medizin und Gesundheit

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Spranger, N. (2014). Influence of intra-operative 3D imaging on functional outcomes and health- related quality of life after open reduction and internal stabilization of intra-articular calcaneal fractures. (Thesis). Freie Universität Berlin. Retrieved from http://dx.doi.org/10.17169/refubium-9049

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):

Spranger, Nikolai. “Influence of intra-operative 3D imaging on functional outcomes and health- related quality of life after open reduction and internal stabilization of intra-articular calcaneal fractures.” 2014. Thesis, Freie Universität Berlin. Accessed January 17, 2021. http://dx.doi.org/10.17169/refubium-9049.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Spranger, Nikolai. “Influence of intra-operative 3D imaging on functional outcomes and health- related quality of life after open reduction and internal stabilization of intra-articular calcaneal fractures.” 2014. Web. 17 Jan 2021.

Vancouver:

Spranger N. Influence of intra-operative 3D imaging on functional outcomes and health- related quality of life after open reduction and internal stabilization of intra-articular calcaneal fractures. [Internet] [Thesis]. Freie Universität Berlin; 2014. [cited 2021 Jan 17]. Available from: http://dx.doi.org/10.17169/refubium-9049.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Spranger N. Influence of intra-operative 3D imaging on functional outcomes and health- related quality of life after open reduction and internal stabilization of intra-articular calcaneal fractures. [Thesis]. Freie Universität Berlin; 2014. Available from: http://dx.doi.org/10.17169/refubium-9049

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation


University of Texas – Austin

2. Parthasarathy, Ashwin Bharadwaj. Quantitative cerebral blood flow measurement with Multi Exposure Speckle Imaging.

Degree: PhD, Biomedical Engineering, 2010, University of Texas – Austin

Cerebral blood flow (CBF) measures are central to the investigation of ischemic strokes, spreading depressions, functional and neuronal activation. Laser Speckle Contrast Imaging (LSCI) is an optical imaging technique that has been used to obtain CBF measures in vivo at high spatial and temporal resolutions, by quantifying the localized spatial blurring of backscattered coherent light induced by blood flow. Despite being widely used for biomedical applications, LSCI's critical limitations such as its tendency to underestimate large flow changes and its inability to accurately estimate CBF through a thinned skull have not been overcome. This dissertation presents a new Multi Exposure Speckle Imaging (MESI) technique that combines a new instrument and mathematical model to overcome these limitations. Additionally, in a pilot clinical study, an adapted neurosurgical microscope was used to obtain intra-operative LSCI images of CBF in humans. The MESI instrument accurately estimates experimental constants by imaging backscattered speckles over a wide range of the camera's exposure durations. The MESI mathematical model helps account for light that has scattered from both static and moving particles. In controlled flow experiments using tissue simulating phantoms, the MESI technique was found to estimate large changes in flow accurately and the estimates of flow changes were found to be unaffected by the presence of static particles in these phantoms. In an in vivo experiment in which the middle cerebral artery in mice was occluded to induce ~100% reduction in CBF, not only was the reduction in CBF accurately estimated by the MESI technique but these estimates of CBF changes were found to be unaffected by the presence of a thinned skull. The validity of statistical models used to derive the MESI mathematical model was confirmed using in vivo dynamic light scattering (DLS) measurements of CBF in mice. The MESI technique's potential to estimate absolute values of CBF in vivo was demonstrated by comparing CBF estimates obtained using the MESI technique to DLS measurements. The MESI technique's ability to measure CBF changes quantitatively through a thinned skull makes it particularly useful in chronic and long term studies leading to the development of better, more accurate stroke models. Advisors/Committee Members: Dunn, Andrew Kenneth, 1970- (advisor), Milner, Thomas (committee member), Tunnell, James (committee member), Emelianov, Stanislav (committee member), Fox, Douglas (committee member).

Subjects/Keywords: Laser Speckle Contrast Imaging; Multi Exposure Speckle Imaging; Optical blood flow measurements; LSCI; MESI; Cerebral blood flow; Ischemic stroke; Speckle spectroscopy; Dynamic Light Scattering; Intra-operative imaging

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Parthasarathy, A. B. (2010). Quantitative cerebral blood flow measurement with Multi Exposure Speckle Imaging. (Doctoral Dissertation). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/ETD-UT-2010-05-996

Chicago Manual of Style (16th Edition):

Parthasarathy, Ashwin Bharadwaj. “Quantitative cerebral blood flow measurement with Multi Exposure Speckle Imaging.” 2010. Doctoral Dissertation, University of Texas – Austin. Accessed January 17, 2021. http://hdl.handle.net/2152/ETD-UT-2010-05-996.

MLA Handbook (7th Edition):

Parthasarathy, Ashwin Bharadwaj. “Quantitative cerebral blood flow measurement with Multi Exposure Speckle Imaging.” 2010. Web. 17 Jan 2021.

Vancouver:

Parthasarathy AB. Quantitative cerebral blood flow measurement with Multi Exposure Speckle Imaging. [Internet] [Doctoral dissertation]. University of Texas – Austin; 2010. [cited 2021 Jan 17]. Available from: http://hdl.handle.net/2152/ETD-UT-2010-05-996.

Council of Science Editors:

Parthasarathy AB. Quantitative cerebral blood flow measurement with Multi Exposure Speckle Imaging. [Doctoral Dissertation]. University of Texas – Austin; 2010. Available from: http://hdl.handle.net/2152/ETD-UT-2010-05-996


University of Technology, Sydney

3. Wan, Ying. The concept of evolutionary computing for robust surgical endoscope tracking and navigation.

Degree: 2017, University of Technology, Sydney

Navigated endoscopy is generally agreed to be the next generation of interventional or surgical endoscopy. It usually combines pre- and intra-operative imaging information to guide physicians during endoscopic procedures. However, endoscope three-dimensional motion tracking that spatially and temporathrelly synchronizes various sensory information still remains challenging for developing different endoscopic navigation systems. To navigate or track the surgical endoscope, three modalities of sensory information are utilized in endoscopic procedures: (1) preoperative images, i.e., three-dimensional CT images, (2) two-dimensional video sequences from the endoscopic camera, and (3) location measurements, attaching an electromagnetic sensor at the endoscope distal tip for measuring the temporal endoscope movement. In this respect, endoscope tracking and navigation aims to fuse these various modalities information to accurately and robustly locate or fly through the endoscope at any interest of regions. Unfortunately, fusing the multimodal information is still an open issue due to the information incompleteness, e.g., image artifacts, tissue deformation, and sensor output inaccuracy in computer assisted endoscopic interventions. This thesis work focuses on fusing the multimodal information for accurate and robust endoscope tracking and navigation. A novel framework of multimodal information fusion is proposed to use evolutionary computing for endoscopic navigation systems. Several main contributions of this dissertation are clarified as follows. First, the concept of evolutionary computing was initially introduced to assist minimally invasive endoscopic surgery. Next, this work modified two evolutionary algorithms of particle swarm optimizer and differential evolution and proposed an enhanced particle swarm optimizer (EPSO) and observation-driven adaptive differential evolution (OADE). EPSO can adaptively update evolutionary parameters in accordance with spatial constraints and the current observation. OADE performs a new mutation operation for DE methods by integrating the current observation of sensor measurements and camera images, which can control the perturbation velocity and the direction of each individual during evolution, to enhance the DE performance. Additionally, the improved evolutionary computing algorithms are applicable to computer vision tasks, e.g., object tracking, motion estimation, and stochastic optimization. The experimental results demonstrate that the proposed evolutionarily computed endoscopic tracking and navigation approaches in this dissertation provide a more accurate and robust endoscopic guidance framework than state-of-the-art methods. Based static phantom data validation, the average guidance accuracy of the EPSO framework was about 3.0 mm, its average position smoothness was 1.0 mm, and its average visual quality was improved to 0.29. By evaluating on a dynamic phantom, the OADE approach reduces the tracking error from 3.96 to 2.89 mm, improves the tracking smoothness from 4.08 to…

Subjects/Keywords: Navigated endoscopy.; Pre- and intra-operative imaging information.; Three modalities of sensory information.; Framework of multimodal information fusion.; Enhanced particle swarm optimizer (EPSO); Observation-driven adaptive differential evolution (OADE); Surgical data validation.

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Wan, Y. (2017). The concept of evolutionary computing for robust surgical endoscope tracking and navigation. (Thesis). University of Technology, Sydney. Retrieved from http://hdl.handle.net/10453/116218

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):

Wan, Ying. “The concept of evolutionary computing for robust surgical endoscope tracking and navigation.” 2017. Thesis, University of Technology, Sydney. Accessed January 17, 2021. http://hdl.handle.net/10453/116218.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Wan, Ying. “The concept of evolutionary computing for robust surgical endoscope tracking and navigation.” 2017. Web. 17 Jan 2021.

Vancouver:

Wan Y. The concept of evolutionary computing for robust surgical endoscope tracking and navigation. [Internet] [Thesis]. University of Technology, Sydney; 2017. [cited 2021 Jan 17]. Available from: http://hdl.handle.net/10453/116218.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Wan Y. The concept of evolutionary computing for robust surgical endoscope tracking and navigation. [Thesis]. University of Technology, Sydney; 2017. Available from: http://hdl.handle.net/10453/116218

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

.