subject:(x ray detector)

Cornell University

1. Shanks, Katherine. Development Of Low-Noise Direct-Conversion X-Ray Area Detectors For Protein Microcrystallography.

Degree: PhD, Physics, 2014, Cornell University

URL: http://hdl.handle.net/1813/37088

► Protein microcrystallography is an active field of study in the synchrotron community, due to the fact that many proteins of scientific interest produce only small,… (more)

Subjects/Keywords: X-ray; Detector; CCD

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Shanks, K. (2014). Development Of Low-Noise Direct-Conversion X-Ray Area Detectors For Protein Microcrystallography. (Doctoral Dissertation). Cornell University. Retrieved from http://hdl.handle.net/1813/37088

Chicago Manual of Style (16^th Edition):

Shanks, Katherine. “Development Of Low-Noise Direct-Conversion X-Ray Area Detectors For Protein Microcrystallography.” 2014. Doctoral Dissertation, Cornell University. Accessed March 01, 2021. http://hdl.handle.net/1813/37088.

MLA Handbook (7^th Edition):

Shanks, Katherine. “Development Of Low-Noise Direct-Conversion X-Ray Area Detectors For Protein Microcrystallography.” 2014. Web. 01 Mar 2021.

Vancouver:

Shanks K. Development Of Low-Noise Direct-Conversion X-Ray Area Detectors For Protein Microcrystallography. [Internet] [Doctoral dissertation]. Cornell University; 2014. [cited 2021 Mar 01]. Available from: http://hdl.handle.net/1813/37088.

Council of Science Editors:

Shanks K. Development Of Low-Noise Direct-Conversion X-Ray Area Detectors For Protein Microcrystallography. [Doctoral Dissertation]. Cornell University; 2014. Available from: http://hdl.handle.net/1813/37088

University of Waterloo

2. Fang, Yuan. Monte Carlo Transport Methods for Semiconductor X-ray Imaging Detectors.

Degree: 2013, University of Waterloo

URL: http://hdl.handle.net/10012/7650

► This thesis describes the development of a novel comprehensive Monte Carlo simulation code, ARTEMIS, for the investigation of electron-hole pair transport mechanisms in a-Se x-ray… (more)

Subjects/Keywords: Monte Carlo; X-ray Detector

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Fang, Y. (2013). Monte Carlo Transport Methods for Semiconductor X-ray Imaging Detectors. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/7650

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

Chicago Manual of Style (16^th Edition):

Fang, Yuan. “Monte Carlo Transport Methods for Semiconductor X-ray Imaging Detectors.” 2013. Thesis, University of Waterloo. Accessed March 01, 2021. http://hdl.handle.net/10012/7650.

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

MLA Handbook (7^th Edition):

Fang, Yuan. “Monte Carlo Transport Methods for Semiconductor X-ray Imaging Detectors.” 2013. Web. 01 Mar 2021.

Vancouver:

Fang Y. Monte Carlo Transport Methods for Semiconductor X-ray Imaging Detectors. [Internet] [Thesis]. University of Waterloo; 2013. [cited 2021 Mar 01]. Available from: http://hdl.handle.net/10012/7650.

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

Council of Science Editors:

Fang Y. Monte Carlo Transport Methods for Semiconductor X-ray Imaging Detectors. [Thesis]. University of Waterloo; 2013. Available from: http://hdl.handle.net/10012/7650

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

University of Minnesota

3. Doyle, Patrick T. The development of a simulator system and hardware test bed for deep space X-Ray navigation.

Degree: MS, Aerospace Engineering and Mechanics, 2013, University of Minnesota

URL: http://hdl.handle.net/11299/162310

► Currently, there is a considerable interest in developing technologies that will allow using photon measurements from celestial x-ray sources for deep space navigation. The impetus… (more)

Subjects/Keywords: Detector; Navigator; Simulator; Spacecraft; X-Ray

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Doyle, P. T. (2013). The development of a simulator system and hardware test bed for deep space X-Ray navigation. (Masters Thesis). University of Minnesota. Retrieved from http://hdl.handle.net/11299/162310

Chicago Manual of Style (16^th Edition):

Doyle, Patrick T. “The development of a simulator system and hardware test bed for deep space X-Ray navigation.” 2013. Masters Thesis, University of Minnesota. Accessed March 01, 2021. http://hdl.handle.net/11299/162310.

MLA Handbook (7^th Edition):

Doyle, Patrick T. “The development of a simulator system and hardware test bed for deep space X-Ray navigation.” 2013. Web. 01 Mar 2021.

Vancouver:

Doyle PT. The development of a simulator system and hardware test bed for deep space X-Ray navigation. [Internet] [Masters thesis]. University of Minnesota; 2013. [cited 2021 Mar 01]. Available from: http://hdl.handle.net/11299/162310.

Council of Science Editors:

Doyle PT. The development of a simulator system and hardware test bed for deep space X-Ray navigation. [Masters Thesis]. University of Minnesota; 2013. Available from: http://hdl.handle.net/11299/162310

University of Melbourne

4. Elbracht-Leong, Stefanie. MYTHEN CdTe: a new generation state-of-the-art X-ray imaging detector.

Degree: 2016, University of Melbourne

URL: http://hdl.handle.net/11343/129454

► MYTHEN is a single photon counting hybrid strip X-ray detector that has found application in X-ray powder diffraction (XRPD) experiments at synchrotrons worldwide. Originally designed… (more)

▼ MYTHEN is a single photon counting hybrid strip X-ray detector that has found application in X-ray powder diffraction (XRPD) experiments at synchrotrons worldwide. Originally designed to operate with hole collecting silicon sensors, MYTHEN is suited for detecting X-rays above 5 keV. However many PD beamlines have been designed for energies above 50 keV where silicon sensors have an efficiency of only a few percent. In order to adapt MYTHEN to meet these energies, the absorption efficiency of the sensor must be substantially increased. Cadmium-telluride (CdTe) has an absorption efficiency approximately 30 times that of silicon at 50 keV, and is therefore a very promising replacement sensor material candidate. Furthermore, the large dynamic range of the pre-amplifier of MYTHEN and its capability to process charge carriers of either polarity has enabled the characterization of both electron and hole collecting CdTe sensors. A selection of Schottky and ohmic type CdTe MYTHEN test structures have undergone a series of characterization experiments including bias and settings optimization, energy calibration, count rate capability as well as stability tests of bias and radiation induced polarizations. The performance of those systems will be presented and discussed in this thesis. Both, the radiation and bias induced polarization effects remained manageable. The MYTHEN system combined with CdTe sensors has proven to be reliable and stable despite high stress experiments. When biased over an extended period of time, the results of the studies have demonstrated that overdepletion of the sensors allowed the system to remain functional for a period of time 6 fold longer. During the high radiation studies, a count rate loss as well as a shift in threshold were observed, leading to the conclusion that individual charge carriers are been trapped. When applying a high bias as well as high flux, the detector system remained functional for 30 minutes. It was also demonstrated that a brief power cycle resumed normal performance after the system had shown symptoms of either polarization effect. Overall, the polarization effects observed on MYTHEN CdTe strip detector are temporary and show a slower impact than reported in the literature. Generally, a higher bias improved the stability of the detector.

Subjects/Keywords: physics; X-ray imaging; CdTe; detector

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Elbracht-Leong, S. (2016). MYTHEN CdTe: a new generation state-of-the-art X-ray imaging detector. (Doctoral Dissertation). University of Melbourne. Retrieved from http://hdl.handle.net/11343/129454

Chicago Manual of Style (16^th Edition):

Elbracht-Leong, Stefanie. “MYTHEN CdTe: a new generation state-of-the-art X-ray imaging detector.” 2016. Doctoral Dissertation, University of Melbourne. Accessed March 01, 2021. http://hdl.handle.net/11343/129454.

MLA Handbook (7^th Edition):

Elbracht-Leong, Stefanie. “MYTHEN CdTe: a new generation state-of-the-art X-ray imaging detector.” 2016. Web. 01 Mar 2021.

Vancouver:

Elbracht-Leong S. MYTHEN CdTe: a new generation state-of-the-art X-ray imaging detector. [Internet] [Doctoral dissertation]. University of Melbourne; 2016. [cited 2021 Mar 01]. Available from: http://hdl.handle.net/11343/129454.

Council of Science Editors:

Elbracht-Leong S. MYTHEN CdTe: a new generation state-of-the-art X-ray imaging detector. [Doctoral Dissertation]. University of Melbourne; 2016. Available from: http://hdl.handle.net/11343/129454

5. Scott, Christopher. Hybrid Semiconductor Detectors for High Spatial Resolution Phase-contrast X-ray Imaging.

Degree: 2019, University of Waterloo

URL: http://hdl.handle.net/10012/14475

► When conventional x-ray radiography presents inadequate absorption-contrast, higher sensitivity can be achieved using phase-contrast methods. The implementation of phase-contrast x-ray imaging using propagation-based techniques requires… (more)

▼ When conventional x-ray radiography presents inadequate absorption-contrast, higher sensitivity can be achieved using phase-contrast methods. The implementation of phase-contrast x-ray imaging using propagation-based techniques requires stringent spatial resolution requirements that necessitate lengthy propagation distances and thin (and hence low detection efficiency) scintillator-based detectors. Thus, imaging throughput is limited, and the absorbed dose in the sample can be unacceptable for radiation sensitive life science and biomedical applications. This work develops hybrid amorphous selenium and complementary metal-oxide-semiconductor detectors with a unique combination of high spatial resolution and detection efficiency for hard x-rays. A semiconductor fabrication process was developed for large-area compatible vertical detector integration by back-end processing. Characterization of signal and noise performance using Fourier-based methods was performed by modulation transfer function, noise power spectrum, and detective quantum efficiency experiments using radiography and microfocus x-ray sources. The measured spatial resolution at each stage of detector development was one of the highest, if not the highest reported for hard x-rays. In fact, charge carrier spreading from x-ray interactions with amorphous selenium was shown physically larger than the pixel pitch for the first time. A simultaneous factor of four improvement in detection efficiency compared to thin gadolinium oxysulfide-based scintillator detectors was also achieved, despite the detector being a relatively unoptimized prototype. Fast propagation-based phase-contrast x-ray imaging in compact geometries is demonstrated using a conventional microfocus source. This simple implementation of the phase-contrast technique was applied to imaging the mouse stifle joint. Using propagation-based edge-enhancement the articular cartilage was delineated, opening the possibility of studying diseases such as osteoarthritis using a compact, relatively simple laboratory setup. This research suggests that hybrid semiconductor technology offers the potential to fill the large performance deficit in high spatial resolution scintillator-based detectors for propagation-based phase-contrast x-ray imaging.

Subjects/Keywords: x-ray imaging; x-ray detector; spatial resolution; phase contrast; amorphous selenium; direct conversion

11 more images…

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Scott, C. (2019). Hybrid Semiconductor Detectors for High Spatial Resolution Phase-contrast X-ray Imaging. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/14475

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

Chicago Manual of Style (16^th Edition):

Scott, Christopher. “Hybrid Semiconductor Detectors for High Spatial Resolution Phase-contrast X-ray Imaging.” 2019. Thesis, University of Waterloo. Accessed March 01, 2021. http://hdl.handle.net/10012/14475.

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

MLA Handbook (7^th Edition):

Scott, Christopher. “Hybrid Semiconductor Detectors for High Spatial Resolution Phase-contrast X-ray Imaging.” 2019. Web. 01 Mar 2021.

Vancouver:

Scott C. Hybrid Semiconductor Detectors for High Spatial Resolution Phase-contrast X-ray Imaging. [Internet] [Thesis]. University of Waterloo; 2019. [cited 2021 Mar 01]. Available from: http://hdl.handle.net/10012/14475.

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

Council of Science Editors:

Scott C. Hybrid Semiconductor Detectors for High Spatial Resolution Phase-contrast X-ray Imaging. [Thesis]. University of Waterloo; 2019. Available from: http://hdl.handle.net/10012/14475

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

Cornell University

6. Weiss, Joel Todd. DEVELOPMENT OF A HIGH DYNAMIC RANGE PIXEL ARRAY DETECTOR FOR SYNCHROTRONS AND XFELS.

Degree: PhD, Physics, 2017, Cornell University

URL: http://hdl.handle.net/1813/59029

► Advances in synchrotron radiation light source technology have opened new lines of inquiry in material science, biology, and everything in between. However, x-ray detector capabilities… (more)

Subjects/Keywords: Electrical engineering; high dynamic range; PAD; pixel array detector; x-ray detector; Physics

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Weiss, J. T. (2017). DEVELOPMENT OF A HIGH DYNAMIC RANGE PIXEL ARRAY DETECTOR FOR SYNCHROTRONS AND XFELS. (Doctoral Dissertation). Cornell University. Retrieved from http://hdl.handle.net/1813/59029

Chicago Manual of Style (16^th Edition):

Weiss, Joel Todd. “DEVELOPMENT OF A HIGH DYNAMIC RANGE PIXEL ARRAY DETECTOR FOR SYNCHROTRONS AND XFELS.” 2017. Doctoral Dissertation, Cornell University. Accessed March 01, 2021. http://hdl.handle.net/1813/59029.

MLA Handbook (7^th Edition):

Weiss, Joel Todd. “DEVELOPMENT OF A HIGH DYNAMIC RANGE PIXEL ARRAY DETECTOR FOR SYNCHROTRONS AND XFELS.” 2017. Web. 01 Mar 2021.

Vancouver:

Weiss JT. DEVELOPMENT OF A HIGH DYNAMIC RANGE PIXEL ARRAY DETECTOR FOR SYNCHROTRONS AND XFELS. [Internet] [Doctoral dissertation]. Cornell University; 2017. [cited 2021 Mar 01]. Available from: http://hdl.handle.net/1813/59029.

Council of Science Editors:

Weiss JT. DEVELOPMENT OF A HIGH DYNAMIC RANGE PIXEL ARRAY DETECTOR FOR SYNCHROTRONS AND XFELS. [Doctoral Dissertation]. Cornell University; 2017. Available from: http://hdl.handle.net/1813/59029

University of Waterloo

7. Lopez Maurino, Sebastian. Design and Optimization of a Stacked Three-Layer X-ray Detector for Multi-Spectral Medical Imaging Applications.

Degree: 2016, University of Waterloo

URL: http://hdl.handle.net/10012/10551

► Dual-Energy (DE) imaging is a powerful technique in x-ray imaging that increases the ability to detect specific materials in a cluttered background, and is used… (more)

▼ Dual-Energy (DE) imaging is a powerful technique in x-ray imaging that increases the ability to detect specific materials in a cluttered background, and is used to more accurately visualize anatomical features and diagnose abnormalities. Single-shot imaging has arisen as one of the dominant techniques used to obtain DE images, but has the intrinsic drawback of a loss of x-ray photons in a metal mid-filter. I propose a new design of a stacked three-layer x-ray detector for DE single-shot imaging that addresses this fundamental drawback. Each layer consists of its own scintillator of individual thickness and an underlying thin-film-transistor-based flat-panel. Three images are obtained simultaneously in the detector during the same x-ray exposure, and thus the imaging system is immune to motion artifacts. The detector operation is two-fold: a conventional radiography image can be obtained by combining all three layers' images, while a DE subtraction image can be captured from the front and back layers, where the middle layer acts as a filter that helps achieve spectral separation. Two sample imaging tasks that can particularly benefit from this new detector design are selected. These are iodinated vessel visualization in coronary angiography and calcified nodule detection in pulmonary radiology. I proceed to optimize the detector parameters and imaging system configuration to best fit these two tasks by obtaining the best possible contrast to noise ratio per root entrance exposure. To achieve this, I develop an analytical model by adapting well-established theoretical foundations to fit this new detector design. These results are compared to a conventional DE temporal subtraction detector and a typical single-shot DE subtraction detector with a metal mid-filter, both of which underwent a similar analytical optimization process. The findings are then validated using advanced Monte Carlo simulations for all optimized detector configurations. The analytical and simulation results indicate that the proposed detector performs comparably as a DE imager to established single-shot detectors. It is therefore clear that this new design is an improvement on the state-of-the-art since it provides an additional feature at no performance cost. Given the performance expected from these initial results and the recent decrease in price for digital x-ray detectors, the simplicity of the three-layer stacked imager approach appears promising to usher in a new generation of multi-spectral digital x-ray imaging.

Subjects/Keywords: X-ray; Detector; Dual Energy; Multilayer; Multi Spectral; Flat-Panel Detector; Angiography; Radiography

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Lopez Maurino, S. (2016). Design and Optimization of a Stacked Three-Layer X-ray Detector for Multi-Spectral Medical Imaging Applications. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/10551

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

Chicago Manual of Style (16^th Edition):

Lopez Maurino, Sebastian. “Design and Optimization of a Stacked Three-Layer X-ray Detector for Multi-Spectral Medical Imaging Applications.” 2016. Thesis, University of Waterloo. Accessed March 01, 2021. http://hdl.handle.net/10012/10551.

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

MLA Handbook (7^th Edition):

Lopez Maurino, Sebastian. “Design and Optimization of a Stacked Three-Layer X-ray Detector for Multi-Spectral Medical Imaging Applications.” 2016. Web. 01 Mar 2021.

Vancouver:

Lopez Maurino S. Design and Optimization of a Stacked Three-Layer X-ray Detector for Multi-Spectral Medical Imaging Applications. [Internet] [Thesis]. University of Waterloo; 2016. [cited 2021 Mar 01]. Available from: http://hdl.handle.net/10012/10551.

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

Council of Science Editors:

Lopez Maurino S. Design and Optimization of a Stacked Three-Layer X-ray Detector for Multi-Spectral Medical Imaging Applications. [Thesis]. University of Waterloo; 2016. Available from: http://hdl.handle.net/10012/10551

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

Penn State University

8. Griffith, Christopher Vance. Characterization and Development of an Event-Driven Hybrid CMOS X-ray Detector.

Degree: 2015, Penn State University

URL: https://submit-etda.libraries.psu.edu/catalog/27239

► Hybrid CMOS detectors (HCD) have provided great benefit to the infrared and optical fields of astronomy, and they are poised to do the same for… (more)

▼ Hybrid CMOS detectors (HCD) have provided great benefit to the infrared and optical fields of astronomy, and they are poised to do the same for X-ray astronomy. Infrared HCDs have already flown on the Hubble Space Telescope and the Wide-Field Infrared Survey Explorer (WISE) mission and are slated to fly on the James Webb Space Telescope (JWST). Hybrid CMOS X-ray detectors offer low susceptibility to radiation damage, low power consumption, and fast readout time to avoid pile-up. The fast readout time is necessary for future high throughput X-ray missions. The Speedster-EXD X-ray HCD presented in this dissertation offers new in-pixel features and reduces known noise sources seen on previous generation HCDs. The Speedster-EXD detector makes a great step forward in the development of these detectors for future space missions. This dissertation begins with an overview of future X-ray space mission concepts and their detector requirements. The background on the physics of semiconductor devices and an explanation of the detection of X-rays with these devices will be discussed followed by a discussion on CCDs and CMOS detectors. Next, hybrid CMOS X-ray detectors will be explained including their advantages and disadvantages. The Speedster-EXD detector and its new features will be outlined including its ability to only read out pixels which contain X-ray events. Test stand design and construction for the Speedster-EXD detector is outlined and the characterization of each parameter on two Speedster-EXD detectors is detailed including read noise, dark current, interpixel capacitance crosstalk (IPC), and energy resolution. Gain variation is also characterized, and a Monte Carlo simulation of its impact on energy resolution is described. This analysis shows that its effect can be successfully nullified with proper calibration, which would be important for a flight mission. Appendix B contains a study of the extreme tidal disruption event, Swift J1644+57, to search for periodicities in its X-ray light curve. Advisors/Committee Members: Abraham David Falcone, Dissertation Advisor/Co-Advisor, David Nelson Burrows, Committee Member, John Andrew Nousek, Committee Member, Mike Eracleous, Committee Member, Stephane Coutu, Committee Member.

Subjects/Keywords: Hybrid CMOS; event-driven; HCD; CCD; X-ray detector

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Griffith, C. V. (2015). Characterization and Development of an Event-Driven Hybrid CMOS X-ray Detector. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/27239

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

Chicago Manual of Style (16^th Edition):

Griffith, Christopher Vance. “Characterization and Development of an Event-Driven Hybrid CMOS X-ray Detector.” 2015. Thesis, Penn State University. Accessed March 01, 2021. https://submit-etda.libraries.psu.edu/catalog/27239.

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

MLA Handbook (7^th Edition):

Griffith, Christopher Vance. “Characterization and Development of an Event-Driven Hybrid CMOS X-ray Detector.” 2015. Web. 01 Mar 2021.

Vancouver:

Griffith CV. Characterization and Development of an Event-Driven Hybrid CMOS X-ray Detector. [Internet] [Thesis]. Penn State University; 2015. [cited 2021 Mar 01]. Available from: https://submit-etda.libraries.psu.edu/catalog/27239.

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

Council of Science Editors:

Griffith CV. Characterization and Development of an Event-Driven Hybrid CMOS X-ray Detector. [Thesis]. Penn State University; 2015. Available from: https://submit-etda.libraries.psu.edu/catalog/27239

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

Luleå University of Technology

9. Garrido, Gonzalo Campos. Modelling of the Analog Electronic Stage of a Detection System for Hard X-ray Astronomy.

Degree: 2012, Luleå University of Technology

URL: http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-48490

►

Germanium detectors are used by the scientic community to study cosmic X-ray sources. In order to localize the exact 3D position of an X-ray… (more)

Subjects/Keywords: Technology; X-ray; Germanium detector; Simulation; Preamplifier; PheniX; Teknik

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Garrido, G. C. (2012). Modelling of the Analog Electronic Stage of a Detection System for Hard X-ray Astronomy. (Thesis). Luleå University of Technology. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-48490

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

Chicago Manual of Style (16^th Edition):

Garrido, Gonzalo Campos. “Modelling of the Analog Electronic Stage of a Detection System for Hard X-ray Astronomy.” 2012. Thesis, Luleå University of Technology. Accessed March 01, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-48490.

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

MLA Handbook (7^th Edition):

Garrido, Gonzalo Campos. “Modelling of the Analog Electronic Stage of a Detection System for Hard X-ray Astronomy.” 2012. Web. 01 Mar 2021.

Vancouver:

Garrido GC. Modelling of the Analog Electronic Stage of a Detection System for Hard X-ray Astronomy. [Internet] [Thesis]. Luleå University of Technology; 2012. [cited 2021 Mar 01]. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-48490.

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

Council of Science Editors:

Garrido GC. Modelling of the Analog Electronic Stage of a Detection System for Hard X-ray Astronomy. [Thesis]. Luleå University of Technology; 2012. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-48490

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

University of Sydney

10. Blake, Samuel. On the development of a novel detector for simultaneous imaging and dosimetry in radiotherapy .

Degree: 2014, University of Sydney

URL: http://hdl.handle.net/2123/12284

► Radiotherapy uses x-ray beams to deliver prescribed radiation doses that conform to target anatomy and minimise exposure of healthy tissue. Accuracy of dose delivery is… (more)

▼ Radiotherapy uses x-ray beams to deliver prescribed radiation doses that conform to target anatomy and minimise exposure of healthy tissue. Accuracy of dose delivery is essential, thus verification of dose distributions in vivo is desirable to monitor treatments and prevent errors from compromising patient outcomes. Electronic portal imaging devices (EPIDs) are commonly used x-ray imagers, however their non water-equivalent response complicates use for dosimetry. In this thesis, a Monte Carlo (MC) model of a standard EPID was developed and extended to novel water-equivalent configurations based on prototypes in which the high atomic number components were replaced with an array of plastic scintillator fibres. The model verified that full simulation of optical transport is not necessary to predict the standard EPID dose response, which can be accurately quantified from energy deposited in the phosphor screen. By incorporating computed tomography images into the model, its capacity to predict portal dose images of humanoid anatomy was also demonstrated. The prototype EPID’s water-equivalent dose response was characterised experimentally and with the MC model. Despite exhibiting lower spatial resolution and contrast-to-noise ratio relative to the standard EPID, its image quality was sufficient to discern gross anatomical structures of an anthropomorphic phantom. Opportunities to improve imaging performance while maintaining a water-equivalent dose response were identified using the model. Longer fibres increased efficiency and use of an extra-mural absorber maximised spatial resolution. Optical coupling between the scintillator fibres and the imaging panel may further improve performance. This thesis demonstrates the feasibility of developing a next-generation EPID for simultaneous imaging and dosimetry in radiotherapy. Such a detector could monitor treatment deliveries in vivo and thereby facilitate adaptations to treatment plans in order to improve patient outcomes.

Subjects/Keywords: Radiation Therapy; Imaging; Dosimetry; Medical Physics; Monte Carlo; X-ray Detector

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Blake, S. (2014). On the development of a novel detector for simultaneous imaging and dosimetry in radiotherapy . (Thesis). University of Sydney. Retrieved from http://hdl.handle.net/2123/12284

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

Chicago Manual of Style (16^th Edition):

Blake, Samuel. “On the development of a novel detector for simultaneous imaging and dosimetry in radiotherapy .” 2014. Thesis, University of Sydney. Accessed March 01, 2021. http://hdl.handle.net/2123/12284.

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

MLA Handbook (7^th Edition):

Blake, Samuel. “On the development of a novel detector for simultaneous imaging and dosimetry in radiotherapy .” 2014. Web. 01 Mar 2021.

Vancouver:

Blake S. On the development of a novel detector for simultaneous imaging and dosimetry in radiotherapy . [Internet] [Thesis]. University of Sydney; 2014. [cited 2021 Mar 01]. Available from: http://hdl.handle.net/2123/12284.

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

Council of Science Editors:

Blake S. On the development of a novel detector for simultaneous imaging and dosimetry in radiotherapy . [Thesis]. University of Sydney; 2014. Available from: http://hdl.handle.net/2123/12284

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

11. Sales, Eraldo de. Desenvolvimento de detectores a gás multifilares para raios X.

Degree: Mestrado, Física, 2015, University of São Paulo

URL: http://www.teses.usp.br/teses/disponiveis/43/43134/tde-19062015-124529/ ;

►

Neste trabalho é apresentado o protótipo de um detector a gás sensível à posição em duas dimensões para aplicação com experimentos de espalhamento e difração… (more)

▼

Neste trabalho é apresentado o protótipo de um detector a gás sensível à posição em duas dimensões para aplicação com experimentos de espalhamento e difração de raios X. Partiu-se de um detector inicialmente desenvolvido para outras aplicações e mostrou-se as modificações necessárias no conceito original do dispositivo. As estratégias adotadas para determinar as adaptações essenciais foram: pesquisar na literatura sobre as características de um detector multifilar para raios X (escolha do gás, da pressão, da janela, etc.), uso de simulações, implementação das mudanças e realização de testes. Ferramentas computacionais foram usadas para estimar a resistência mecânica e a atenuação de fótons de raios X que ajudaram na determinação do material para a construção da janela de entrada. Simulações do detector foram construídas com o programa Garfield e serviram para o estudo do funcionamento do detector, além de determinar os parâmetros ótimos de operação do equipamento, como a distância entre os fios e diâmetro dos mesmos, além da diferença de potencial a ser aplicada, entre muitos outros parâmetros. Os resultados obtidos mostraram que o conceito do detector multifilar com as devidas adaptações permitem o funcionamento desse dispositivo para detecção de raios X. No entanto, dependendo da aplicação, pode ser necessário aprimorar a resolução do equipamento, a fim de ter uma melhor descrição dos dados coletados. São apontadas algumas ideias para esse aprimoramento. Apresentam-se também resultados interessantes obtidos com um detector de padrão microscópico chamado de triplo GEM. Esse dispositivo pertence ao laboratório de desenvolvimento de detectores a gás (GDD Group) do CERN e foi utilizado em um trabalho nessa instituição. Os resultados mostraram o potencial do equipamento para detecção de raios X. Os resultados e simulações apresentadas nesse trabalho confirmaram que as mudanças no conceito original do detector permitem seu uso na detecção de raios X. Além disso, foi possível obter várias indicações para uma maior otimização, que pode melhorar sua resolução e estabilidade. O conhecimento adquirido sobre o programa Garfield é fundamental nesse processo, uma vez que é possível propor mudanças e testá-las no computador. Essas melhorias podem ser empregadas em uma nova versão desse detector que será construído nos laboratórios do Instituto de Física da Universidade de São Paulo (IFUSP). Pode-se indicar ainda a possibilidade do uso de detectores GEM aplicados aos experimentos de espalhamento e difração de raios X. É necessário ressaltar que o grupo de Suaide et al. do departamento de Física Nuclear do IFUSP já trabalha com a tecnologia GEM, porém focada em outras aplicações.

This work presents the prototype of a 2D position sensitive gas detector for application in X-ray scattering and diffraction experiments. Starting from a detector initially developed for other applications and will show the required changes on the original concept of this device. The strategy used to determine the necessary adaptations were based on…

Advisors/Committee Members: Oliveira, Cristiano Luis Pinto de.

Subjects/Keywords: Detecção de Partículas; Detector de raios X; Experimental Physics; Física Experimental; Particle Detection; Simulação; Simulation; X-ray Detector

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Sales, E. d. (2015). Desenvolvimento de detectores a gás multifilares para raios X. (Masters Thesis). University of São Paulo. Retrieved from http://www.teses.usp.br/teses/disponiveis/43/43134/tde-19062015-124529/ ;

Chicago Manual of Style (16^th Edition):

Sales, Eraldo de. “Desenvolvimento de detectores a gás multifilares para raios X.” 2015. Masters Thesis, University of São Paulo. Accessed March 01, 2021. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-19062015-124529/ ;.

MLA Handbook (7^th Edition):

Sales, Eraldo de. “Desenvolvimento de detectores a gás multifilares para raios X.” 2015. Web. 01 Mar 2021.

Vancouver:

Sales Ed. Desenvolvimento de detectores a gás multifilares para raios X. [Internet] [Masters thesis]. University of São Paulo; 2015. [cited 2021 Mar 01]. Available from: http://www.teses.usp.br/teses/disponiveis/43/43134/tde-19062015-124529/ ;.

Council of Science Editors:

Sales Ed. Desenvolvimento de detectores a gás multifilares para raios X. [Masters Thesis]. University of São Paulo; 2015. Available from: http://www.teses.usp.br/teses/disponiveis/43/43134/tde-19062015-124529/ ;

12. Amari, Smaïl. Etude des matériaux pérovskites pour la détection directe des rayonnements ionisants : Study of perovskite materials for direct detection of ionizing radiation.

Degree: Docteur es, Matériaux, Mécanique, Génie civil, Electrochimie, 2020, Université Grenoble Alpes

URL: http://www.theses.fr/2020GRALI039

►

La pérovskite hybride organique-inorganique MAPbBr3 est un semi-conducteur prometteur pour les applications en détection des rayons X. La photodétection dans la gamme d’énergie utilisée en… (more)

▼

La pérovskite hybride organique-inorganique MAPbBr3 est un semi-conducteur prometteur pour les applications en détection des rayons X. La photodétection dans la gamme d’énergie utilisée en radiographie médicale nécessite une forte épaisseur de matériau (> 500 µm). L’objectif principal de ce travail a été d’étudier l’impact des conditions de croissance en solution de cristaux d’épaisseur millimétrique sur les défauts cristallins (contraintes, dislocations, inclusions, et impuretés). A cette occasion, nous avons mis en place une méthodologie originale pour l’optimisation rapide des conditions de croissance sur la base des mécanismes de croissance et du suivi de la cinétique des croissances. Les conditions de croissance utilisées ont permis de réaliser des cristaux couvrant une large gamme de défauts cristallins. L’impact de ces défauts sur les propriétés électroniques des dispositifs détecteurs X à base de monocristaux de MAPbBr3 a été étudié. Il apparait que les contraintes, dislocations, impuretés, et inclusions nanoscopiques de solvant impactent peu la résistivité et la sensibilité des détecteurs. En contrepartie, une forte densité d’inclusions micrométriques tend à dégrader significativement les propriétés électroniques des dispositifs.

The hybrid organic-inorganic perovskite MAPbBr3 is a promising semiconductor for X-ray detection applications. Photodetection in the energy range used in medical radiography requires a high material thickness (> 500 µm). The main objective of this work was to study the impact of solution growth conditions of millimeter thick crystals on crystal defects (strains, dislocations, inclusions, and impurities). In this context, we set up an original methodology for the rapid optimization of growth conditions based on growth mechanisms and growth kinetics monitoring. The growth conditions used enabled us to produce crystals covering a wide range of crystal defects. The impact of these defects on the electronic properties of MAPbBr3 single crystal X-ray detector devices was studied. It appears that strains, dislocations, impurities, and nanoscopic solvent inclusions have little impact on the resistivity and sensitivity of the detectors. On the other hand, a high density of micrometric inclusions tends to significantly degrade the electronic properties of the devices.

Advisors/Committee Members: Zaccaro, Julien (thesis director).

Subjects/Keywords: Croissance; Cristal; Pérovskite; Défaut; Détecteur; Rayons X; Crystal growth; Perovskite; Defect; Detector; X-Ray; 540

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Amari, S. (2020). Etude des matériaux pérovskites pour la détection directe des rayonnements ionisants : Study of perovskite materials for direct detection of ionizing radiation. (Doctoral Dissertation). Université Grenoble Alpes. Retrieved from http://www.theses.fr/2020GRALI039

Chicago Manual of Style (16^th Edition):

Amari, Smaïl. “Etude des matériaux pérovskites pour la détection directe des rayonnements ionisants : Study of perovskite materials for direct detection of ionizing radiation.” 2020. Doctoral Dissertation, Université Grenoble Alpes. Accessed March 01, 2021. http://www.theses.fr/2020GRALI039.

MLA Handbook (7^th Edition):

Amari, Smaïl. “Etude des matériaux pérovskites pour la détection directe des rayonnements ionisants : Study of perovskite materials for direct detection of ionizing radiation.” 2020. Web. 01 Mar 2021.

Vancouver:

Amari S. Etude des matériaux pérovskites pour la détection directe des rayonnements ionisants : Study of perovskite materials for direct detection of ionizing radiation. [Internet] [Doctoral dissertation]. Université Grenoble Alpes; 2020. [cited 2021 Mar 01]. Available from: http://www.theses.fr/2020GRALI039.

Council of Science Editors:

Amari S. Etude des matériaux pérovskites pour la détection directe des rayonnements ionisants : Study of perovskite materials for direct detection of ionizing radiation. [Doctoral Dissertation]. Université Grenoble Alpes; 2020. Available from: http://www.theses.fr/2020GRALI039

University of Saskatchewan

13. Simonson, Blaine M. X-ray Induced Effects and Charge Collection Efficiency in Stabilized Amorphous Selenium Based X-ray Photoconductors.

Degree: 2020, University of Saskatchewan

URL: http://hdl.handle.net/10388/12912

► Stabilized amorphous selenium (a-Se) photoconductive layers are currently used in most modern flat panel digital x-ray image detectors for mammography. The performance of these detectors… (more)

Subjects/Keywords: Amorphous Selenium; X-ray Detector; Charge Transport; Charge Carrier Lifetime; X-ray damage to Charge Transport; Charge Collection Efficiency

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Simonson, B. M. (2020). X-ray Induced Effects and Charge Collection Efficiency in Stabilized Amorphous Selenium Based X-ray Photoconductors. (Thesis). University of Saskatchewan. Retrieved from http://hdl.handle.net/10388/12912

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

Chicago Manual of Style (16^th Edition):

Simonson, Blaine M. “X-ray Induced Effects and Charge Collection Efficiency in Stabilized Amorphous Selenium Based X-ray Photoconductors.” 2020. Thesis, University of Saskatchewan. Accessed March 01, 2021. http://hdl.handle.net/10388/12912.

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

MLA Handbook (7^th Edition):

Simonson, Blaine M. “X-ray Induced Effects and Charge Collection Efficiency in Stabilized Amorphous Selenium Based X-ray Photoconductors.” 2020. Web. 01 Mar 2021.

Vancouver:

Simonson BM. X-ray Induced Effects and Charge Collection Efficiency in Stabilized Amorphous Selenium Based X-ray Photoconductors. [Internet] [Thesis]. University of Saskatchewan; 2020. [cited 2021 Mar 01]. Available from: http://hdl.handle.net/10388/12912.

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

Council of Science Editors:

Simonson BM. X-ray Induced Effects and Charge Collection Efficiency in Stabilized Amorphous Selenium Based X-ray Photoconductors. [Thesis]. University of Saskatchewan; 2020. Available from: http://hdl.handle.net/10388/12912

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

14. Eguchi, Hiroshi. Study of Vapor-Deposited Au:Er Films and Development of a Metallic Magnetic Calorimeter for Future X-ray Astronomy Missions.

Degree: PhD, Physics, 2008, Brown University

URL: https://repository.library.brown.edu/studio/item/bdr:37/

► This thesis describes the development of a metallic metallic calorimeters (MMC) for a soft x-ray detection. A MMC utilize diluted concentration of a paramagnetic material… (more)

Subjects/Keywords: Au:Er film; magnetic microcalorimeter; x-ray detector; detector array

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Eguchi, H. (2008). Study of Vapor-Deposited Au:Er Films and Development of a Metallic Magnetic Calorimeter for Future X-ray Astronomy Missions. (Doctoral Dissertation). Brown University. Retrieved from https://repository.library.brown.edu/studio/item/bdr:37/

Chicago Manual of Style (16^th Edition):

Eguchi, Hiroshi. “Study of Vapor-Deposited Au:Er Films and Development of a Metallic Magnetic Calorimeter for Future X-ray Astronomy Missions.” 2008. Doctoral Dissertation, Brown University. Accessed March 01, 2021. https://repository.library.brown.edu/studio/item/bdr:37/.

MLA Handbook (7^th Edition):

Eguchi, Hiroshi. “Study of Vapor-Deposited Au:Er Films and Development of a Metallic Magnetic Calorimeter for Future X-ray Astronomy Missions.” 2008. Web. 01 Mar 2021.

Vancouver:

Eguchi H. Study of Vapor-Deposited Au:Er Films and Development of a Metallic Magnetic Calorimeter for Future X-ray Astronomy Missions. [Internet] [Doctoral dissertation]. Brown University; 2008. [cited 2021 Mar 01]. Available from: https://repository.library.brown.edu/studio/item/bdr:37/.

Council of Science Editors:

Eguchi H. Study of Vapor-Deposited Au:Er Films and Development of a Metallic Magnetic Calorimeter for Future X-ray Astronomy Missions. [Doctoral Dissertation]. Brown University; 2008. Available from: https://repository.library.brown.edu/studio/item/bdr:37/

Brno University of Technology

15. Fridrichová, Eva. Design detektoru kovu a rentgenu zavazadel: Design of metal detector and X-ray luggage scanner.

Degree: 2018, Brno University of Technology

URL: http://hdl.handle.net/11012/3602

► Subject of this Diploma thesis is the design of metal detector and luggage X-ray screening. The thesis concerns with design of frame metal detector and… (more)

Subjects/Keywords: Design; ergonomie; bezpečnostní technika; detektor; rámový detektor kovu; rentgen; zavazadlový rentgen; rentgenové skenování.; Design; ergonomic; security equipment; detector; frame metal detector; x-ray; luggage screening; X-ray screening.

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Fridrichová, E. (2018). Design detektoru kovu a rentgenu zavazadel: Design of metal detector and X-ray luggage scanner. (Thesis). Brno University of Technology. Retrieved from http://hdl.handle.net/11012/3602

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

Chicago Manual of Style (16^th Edition):

Fridrichová, Eva. “Design detektoru kovu a rentgenu zavazadel: Design of metal detector and X-ray luggage scanner.” 2018. Thesis, Brno University of Technology. Accessed March 01, 2021. http://hdl.handle.net/11012/3602.

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

MLA Handbook (7^th Edition):

Fridrichová, Eva. “Design detektoru kovu a rentgenu zavazadel: Design of metal detector and X-ray luggage scanner.” 2018. Web. 01 Mar 2021.

Vancouver:

Fridrichová E. Design detektoru kovu a rentgenu zavazadel: Design of metal detector and X-ray luggage scanner. [Internet] [Thesis]. Brno University of Technology; 2018. [cited 2021 Mar 01]. Available from: http://hdl.handle.net/11012/3602.

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

Council of Science Editors:

Fridrichová E. Design detektoru kovu a rentgenu zavazadel: Design of metal detector and X-ray luggage scanner. [Thesis]. Brno University of Technology; 2018. Available from: http://hdl.handle.net/11012/3602

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

University of Canterbury

16. Sedayo, Anas. Clinical applications of the Medipix detector.

Degree: PhD, Physics, 2012, University of Canterbury

URL: http://dx.doi.org/10.26021/8114

► In this thesis a recently developed energy resolving x-ray detector (Medipix) is used to investigate potential medical applications of spectral x-ray imaging. Computed Tomography (CT)… (more)

Subjects/Keywords: x-ray; Medipix Detector; MARS-CT; Angiography; Blood vessel and Fatty liver

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Sedayo, A. (2012). Clinical applications of the Medipix detector. (Doctoral Dissertation). University of Canterbury. Retrieved from http://dx.doi.org/10.26021/8114

Chicago Manual of Style (16^th Edition):

Sedayo, Anas. “Clinical applications of the Medipix detector.” 2012. Doctoral Dissertation, University of Canterbury. Accessed March 01, 2021. http://dx.doi.org/10.26021/8114.

MLA Handbook (7^th Edition):

Sedayo, Anas. “Clinical applications of the Medipix detector.” 2012. Web. 01 Mar 2021.

Vancouver:

Sedayo A. Clinical applications of the Medipix detector. [Internet] [Doctoral dissertation]. University of Canterbury; 2012. [cited 2021 Mar 01]. Available from: http://dx.doi.org/10.26021/8114.

Council of Science Editors:

Sedayo A. Clinical applications of the Medipix detector. [Doctoral Dissertation]. University of Canterbury; 2012. Available from: http://dx.doi.org/10.26021/8114

University of Guelph

17. Cureatz, Daniel. Refinement of the GUPIX Treatment of Multiple Ionization Satellites and Detector Non-linearity.

Degree: MS, Department of Physics, 2020, University of Guelph

URL: https://atrium.lib.uoguelph.ca/xmlui/handle/10214/21140

► Wavelength-dispersive spectroscopy was used to obtain the portion of the K X-ray spectra that contained multiple ionization satellites of chlorine, potassium, calcium, titanium and chromium… (more)

Subjects/Keywords: GUPIX; Multiple Ionization Satellites; PIXE; Detector Non-linearity; X-ray; alpha-pixe

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Cureatz, D. (2020). Refinement of the GUPIX Treatment of Multiple Ionization Satellites and Detector Non-linearity. (Masters Thesis). University of Guelph. Retrieved from https://atrium.lib.uoguelph.ca/xmlui/handle/10214/21140

Chicago Manual of Style (16^th Edition):

Cureatz, Daniel. “Refinement of the GUPIX Treatment of Multiple Ionization Satellites and Detector Non-linearity.” 2020. Masters Thesis, University of Guelph. Accessed March 01, 2021. https://atrium.lib.uoguelph.ca/xmlui/handle/10214/21140.

MLA Handbook (7^th Edition):

Cureatz, Daniel. “Refinement of the GUPIX Treatment of Multiple Ionization Satellites and Detector Non-linearity.” 2020. Web. 01 Mar 2021.

Vancouver:

Cureatz D. Refinement of the GUPIX Treatment of Multiple Ionization Satellites and Detector Non-linearity. [Internet] [Masters thesis]. University of Guelph; 2020. [cited 2021 Mar 01]. Available from: https://atrium.lib.uoguelph.ca/xmlui/handle/10214/21140.

Council of Science Editors:

Cureatz D. Refinement of the GUPIX Treatment of Multiple Ionization Satellites and Detector Non-linearity. [Masters Thesis]. University of Guelph; 2020. Available from: https://atrium.lib.uoguelph.ca/xmlui/handle/10214/21140

18. Tanguay, Jesse Evan. Image quality of energy-dependent approaches for x-ray angiography.

Degree: 2013, University of Western Ontario

URL: https://ir.lib.uwo.ca/etd/1658

► Digital subtraction angiography (DSA) is an x-ray-based imaging method widely used for diagnosis and treatment of patients with vascular disease. This technique uses subtraction of… (more)

▼ Digital subtraction angiography (DSA) is an x-ray-based imaging method widely used for diagnosis and treatment of patients with vascular disease. This technique uses subtraction of images acquired before and after injection of an iodinated contrast agent to generate iodine-specific images. While it is extremely successful at imaging structures that are near-stationary over a period of several seconds, motion artifacts can result in poor image quality with uncooperative patients and DSA is rarely used for coronary applications. Alternative methods of generating iodine-specific images with reduced motion artifacts might exploit the energy-dependence of x-ray attenuation in a patient. This could be performed either by aquiring two or more post-injection images at different x-ray energies or from an analysis of the spectral shape of the transmitted spectrum. The first method, which we call energy-subtraction angiography (ESA), was introduced as a dual-energy alternative to DSA over two decades ago but technological limitations of the time resulted in poor image quality. The second potential method, energy-resolved angiography (ERA), requires energy-resolving photon-counting (EPC) x-ray detectors that are under development in a number of laboratories. The goals of this thesis were to: 1) develop a method of comparing image quality in terms of signal-to-noise ratio (SNR) obtained using ESA and ERA with DSA assuming ideal instrumentation for each; 2) develop a method of describing performance and image quality that can be obtained in practice with photon-counting detectors, and; 3) assess the potential of ESA and ERA by comparing the available iodine SNR with that of DSA including the effects of non-ideal detector performance. It is shown that using ideal instrumentation both ESA and ERA can provide iodine-specific images with SNR equal to that of DSA. However, stochastic x-ray interaction and detection processes will degrade SNR obtained with ERA and ESA to a larger extent than DSA. Energy-resolved angiography will achieve near-ideal performance only with low detector electronic noise levels, high collection efficiency of secondary quanta liberated in the detector, and low Compton cross sections. It is concluded that, when these conditions are satsified, ESA and ERA can provide iodine SNR within 25% of that of DSA for the same patient entrance exposure, and therefore may provide alternatives to DSA in situations where motion artifacts are expected to result in compromised DSA procedures, such as in coronary applications. This could have important applications for subtraction imaging of the coronary arteries in the near future.

Subjects/Keywords: x-ray angiography; dual energy imaging; energy-resolved imaging; photon counting detectors; x-ray image quality; x-ray detector performance; Applied Statistics; Cardiovascular Diseases; Diagnosis; Probability

11 more images…

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Tanguay, J. E. (2013). Image quality of energy-dependent approaches for x-ray angiography. (Thesis). University of Western Ontario. Retrieved from https://ir.lib.uwo.ca/etd/1658

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

Chicago Manual of Style (16^th Edition):

Tanguay, Jesse Evan. “Image quality of energy-dependent approaches for x-ray angiography.” 2013. Thesis, University of Western Ontario. Accessed March 01, 2021. https://ir.lib.uwo.ca/etd/1658.

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

MLA Handbook (7^th Edition):

Tanguay, Jesse Evan. “Image quality of energy-dependent approaches for x-ray angiography.” 2013. Web. 01 Mar 2021.

Vancouver:

Tanguay JE. Image quality of energy-dependent approaches for x-ray angiography. [Internet] [Thesis]. University of Western Ontario; 2013. [cited 2021 Mar 01]. Available from: https://ir.lib.uwo.ca/etd/1658.

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

Council of Science Editors:

Tanguay JE. Image quality of energy-dependent approaches for x-ray angiography. [Thesis]. University of Western Ontario; 2013. Available from: https://ir.lib.uwo.ca/etd/1658

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

University of Waterloo

19. Camlica, Ahmet. Device Architectures for Improved Temporal Response with Amorphous Selenium Radiation Detectors.

Degree: 2019, University of Waterloo

URL: http://hdl.handle.net/10012/14826

► Amorphous selenium (a-Se) is a commercially mature direct conversion photoconductor capable of very high spatial resolution that enables the early detection of small and subtle… (more)

▼ Amorphous selenium (a-Se) is a commercially mature direct conversion photoconductor capable of very high spatial resolution that enables the early detection of small and subtle lesions in breast cancer screening and diagnostics. However, a-Se exhibits poor collection efficiency due to low carrier mobility and charge trapping related to its amorphous nature. Release of trapped electrons gives rise memory artifacts such as photocurrent lag, that can last for several seconds after the cessation of the X-ray pulse, thus making a-Se a challenging material for use in high spatial resolution dynamic imaging applications. In this research, the intrinsic causes of temporal behavior in a-Se photoconductor are investigated using lag, ghosting and pulse height spectroscopy (PHS) measurements on conventional a-Se detectors. The measured data is compared to the data obtained with alternative a-Se imaging device architectures for improved dynamic imaging performance. The alternative device architectures include: (1) use of a polyimide blocking layer that permits the operation of a-Se devices with higher electric fields, (2) a high field capable solid-state unipolar charge sensing detector that can achieve hole-mostly charge sensing and (3), small pixel geometries to obtain the small pixel effect (SPE). Theoretical and experimental results show that an image lag of less than 1.5% is achieved using the solid-state unipolar charge sensing detector for dynamic imaging which is in stark contrast to measurements performed on conventional a-Se imaging devices that exhibit a lag of up to 16%. PHS measurements are also presented that demonstrate, for the first time, a measured energy resolution of 8.3 keV at 59.5 keV was for the unipolar charge sensing device in contrast to 22 keV at 59.5 keV for conventional a-Se devices. Also, the photon counting ability of a-Se photoconductor was demonstrated by integrating a SPE capable a-Se detector with a CMOS pixel array having 11 x 11-μm pixels. Measured results on this CMOS array using a mono-energetic radioactive source are presented which indicate for the first time, that amorphous semiconductors can be used for photon-counting X-ray imaging applications. The research results indicate that mature large-area a-Se photoconductor, when incorporated with a single polarity charge sensing device design such as SPE or the solid-state unipolar charge sensing detector, can meet the requirements of high spatial resolution dynamic medical imaging applications such as spectral mammography or even micro-angiography without resorting to new sensor materials or crystalline semiconductors that are challenging to scale up to larger areas because of cost and yield issues associated with growth and bonding technology.

Subjects/Keywords: amorphous selenium; pulse-height spectroscopy; unipolar charge sensing; small pixel effect; X-ray; Gamma-ray; medical imaging; detector

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Camlica, A. (2019). Device Architectures for Improved Temporal Response with Amorphous Selenium Radiation Detectors. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/14826

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

Chicago Manual of Style (16^th Edition):

Camlica, Ahmet. “Device Architectures for Improved Temporal Response with Amorphous Selenium Radiation Detectors.” 2019. Thesis, University of Waterloo. Accessed March 01, 2021. http://hdl.handle.net/10012/14826.

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

MLA Handbook (7^th Edition):

Camlica, Ahmet. “Device Architectures for Improved Temporal Response with Amorphous Selenium Radiation Detectors.” 2019. Web. 01 Mar 2021.

Vancouver:

Camlica A. Device Architectures for Improved Temporal Response with Amorphous Selenium Radiation Detectors. [Internet] [Thesis]. University of Waterloo; 2019. [cited 2021 Mar 01]. Available from: http://hdl.handle.net/10012/14826.

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

Council of Science Editors:

Camlica A. Device Architectures for Improved Temporal Response with Amorphous Selenium Radiation Detectors. [Thesis]. University of Waterloo; 2019. Available from: http://hdl.handle.net/10012/14826

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

20. Van Vuure, T.L. Thermal-neutron detection based on the Gas Electron Multiplier.

Degree: 2004, DUP Science

URL: http://resolver.tudelft.nl/uuid:bc997ad4-8aa3-497f-bcee-e4a62b5dcc9a ; urn:NBN:nl:ui:24-uuid:bc997ad4-8aa3-497f-bcee-e4a62b5dcc9a ; urn:NBN:nl:ui:24-uuid:bc997ad4-8aa3-497f-bcee-e4a62b5dcc9a ; http://resolver.tudelft.nl/uuid:bc997ad4-8aa3-497f-bcee-e4a62b5dcc9a

► Future high luminosity spallation neutron sources put strenuous demands on detector performance. This research has focused on applying the Gas Electron Multiplier (GEM) to meet… (more)

Subjects/Keywords: radiation detector; neutron detector; x-ray detector; gaseous detector; gas-filled detector; position-sensitive detector; gas electron multiplier

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Van Vuure, T. L. (2004). Thermal-neutron detection based on the Gas Electron Multiplier. (Doctoral Dissertation). DUP Science. Retrieved from http://resolver.tudelft.nl/uuid:bc997ad4-8aa3-497f-bcee-e4a62b5dcc9a ; urn:NBN:nl:ui:24-uuid:bc997ad4-8aa3-497f-bcee-e4a62b5dcc9a ; urn:NBN:nl:ui:24-uuid:bc997ad4-8aa3-497f-bcee-e4a62b5dcc9a ; http://resolver.tudelft.nl/uuid:bc997ad4-8aa3-497f-bcee-e4a62b5dcc9a

Chicago Manual of Style (16^th Edition):

Van Vuure, T L. “Thermal-neutron detection based on the Gas Electron Multiplier.” 2004. Doctoral Dissertation, DUP Science. Accessed March 01, 2021. http://resolver.tudelft.nl/uuid:bc997ad4-8aa3-497f-bcee-e4a62b5dcc9a ; urn:NBN:nl:ui:24-uuid:bc997ad4-8aa3-497f-bcee-e4a62b5dcc9a ; urn:NBN:nl:ui:24-uuid:bc997ad4-8aa3-497f-bcee-e4a62b5dcc9a ; http://resolver.tudelft.nl/uuid:bc997ad4-8aa3-497f-bcee-e4a62b5dcc9a.

MLA Handbook (7^th Edition):

Van Vuure, T L. “Thermal-neutron detection based on the Gas Electron Multiplier.” 2004. Web. 01 Mar 2021.

Vancouver:

Van Vuure TL. Thermal-neutron detection based on the Gas Electron Multiplier. [Internet] [Doctoral dissertation]. DUP Science; 2004. [cited 2021 Mar 01]. Available from: http://resolver.tudelft.nl/uuid:bc997ad4-8aa3-497f-bcee-e4a62b5dcc9a ; urn:NBN:nl:ui:24-uuid:bc997ad4-8aa3-497f-bcee-e4a62b5dcc9a ; urn:NBN:nl:ui:24-uuid:bc997ad4-8aa3-497f-bcee-e4a62b5dcc9a ; http://resolver.tudelft.nl/uuid:bc997ad4-8aa3-497f-bcee-e4a62b5dcc9a.

Council of Science Editors:

Van Vuure TL. Thermal-neutron detection based on the Gas Electron Multiplier. [Doctoral Dissertation]. DUP Science; 2004. Available from: http://resolver.tudelft.nl/uuid:bc997ad4-8aa3-497f-bcee-e4a62b5dcc9a ; urn:NBN:nl:ui:24-uuid:bc997ad4-8aa3-497f-bcee-e4a62b5dcc9a ; urn:NBN:nl:ui:24-uuid:bc997ad4-8aa3-497f-bcee-e4a62b5dcc9a ; http://resolver.tudelft.nl/uuid:bc997ad4-8aa3-497f-bcee-e4a62b5dcc9a

Universidade Federal de Viçosa

21. José Antônio Duarte Santos. Crescimento e caracterização de filmes espessos de CdTe para a fabricação de detectores de raios-X.

Degree: 2010, Universidade Federal de Viçosa

URL: http://www.tede.ufv.br/tedesimplificado/tde_busca/arquivo.php?codArquivo=2744

►

A presença de detectores de radiação nuclear é de extrema importância em várias indústrias como, por exemplo, a médica, a astronômica e de segurança nacional.… (more)

▼

A presença de detectores de radiação nuclear é de extrema importância em várias indústrias como, por exemplo, a médica, a astronômica e de segurança nacional. Existem inúmeros tipos de detectores. Um deles, o detector construído com ligas semicondutoras de CdTe e CdZnTe, tem se tornado bastante popular devido às características peculiares como: praticidade, densidade, resolução energética e pela possibilidade de operarem a temperatura ambiente. Neste trabalho, faremos uma revisão de detectores de radiação nuclear, especialmente dos construídos com semicondutores. Apresentamos também métodos de caracterização estrutural, superficial e elétrica de amostras a fim de informar qual tipo de amostra é a mais viável para tal finalidade. Mostramos os resultados do crescimento de filmes espessos de CdTe, utilizando a técnica de Epitaxia de Paredes Quentes (HWE) nas temperaturas de 150 C e 250 C sobre Si (111), vidro simples e vidro coberto com óxido de estanho dopado com flúor. São também apresentados os resultados de caracterização dos filmes de CdTe por difração de raios-X e caracterização elétrica através de curvas I x V do filme.

The presence of nuclear radiation detectors is extremily important in various industries such as medical, astronomy and of national security. There are many types of detectors. However, the detector constructed with CdTe and CdZnTe semiconductor films has become very popular due to some characteristics as convenience, density, energy resolution and for having the possibility of operating at room temperature. In this work, a review of nuclear radiation detectors is made, especially those built with semiconductor. Here are also presented structural, superficial and electric characterization methods to inform which type of sample is the most viable for such purpose. We also present in this work the results of the of CdTe films growth using HotWall Epitaxy technique (HWE) in temperatures from 150 C and 250 C over Si (111), simple glass and glass covered with tin oxide with fluorine . It is also presented the results ofcharacterization of CdTe films by x-ray diffraction and electrical characterization by curves I x V.

Advisors/Committee Members: Álvaro José Magalhães Neves, Alexandre Tadeu Gomes Carvalho, Helder Soares Moreira, Edson Massayuki Kakuno, Álvaro Vianna Novaes de Carvalho Teixeira, Sukarno Olavo Ferreira.

Subjects/Keywords: Detector de raios-x; Filme epitaxial; CdTe; HWE; FISICA DA MATERIA CONDENSADA; CdTe; X-ray detectors; Epitaxy film; HWE

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Santos, J. A. D. (2010). Crescimento e caracterização de filmes espessos de CdTe para a fabricação de detectores de raios-X. (Thesis). Universidade Federal de Viçosa. Retrieved from http://www.tede.ufv.br/tedesimplificado/tde_busca/arquivo.php?codArquivo=2744

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

Chicago Manual of Style (16^th Edition):

Santos, José Antônio Duarte. “Crescimento e caracterização de filmes espessos de CdTe para a fabricação de detectores de raios-X.” 2010. Thesis, Universidade Federal de Viçosa. Accessed March 01, 2021. http://www.tede.ufv.br/tedesimplificado/tde_busca/arquivo.php?codArquivo=2744.

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

MLA Handbook (7^th Edition):

Santos, José Antônio Duarte. “Crescimento e caracterização de filmes espessos de CdTe para a fabricação de detectores de raios-X.” 2010. Web. 01 Mar 2021.

Vancouver:

Santos JAD. Crescimento e caracterização de filmes espessos de CdTe para a fabricação de detectores de raios-X. [Internet] [Thesis]. Universidade Federal de Viçosa; 2010. [cited 2021 Mar 01]. Available from: http://www.tede.ufv.br/tedesimplificado/tde_busca/arquivo.php?codArquivo=2744.

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

Council of Science Editors:

Santos JAD. Crescimento e caracterização de filmes espessos de CdTe para a fabricação de detectores de raios-X. [Thesis]. Universidade Federal de Viçosa; 2010. Available from: http://www.tede.ufv.br/tedesimplificado/tde_busca/arquivo.php?codArquivo=2744

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

22. Buis, Camille. Etude des corrélations entre les défauts structuraux et les inhomogénéités spatiales des détecteurs de rayons X à base de CdTe pour l'imagerie médicale : Study of correlation between the structural defects and inhomogeneities of CDTE based radiation detectors used for medical imaging.

Degree: Docteur es, Image, Vision, Signal, 2013, Saint-Etienne

URL: http://www.theses.fr/2013STET4016

►

Ces travaux de doctorat proposent d’apporter une contribution à l’identification et à la compréhension des phénomènes limitant les performances de détecteurs de rayon X à… (more)

▼

Ces travaux de doctorat proposent d’apporter une contribution à l’identification et à la compréhension des phénomènes limitant les performances de détecteurs de rayon X à base de CdTe:Cl développés pour des applications en radiographie. En effet, des inhomogénéités spatiales non-stables dans le temps sont observées dans la réponse de ces capteurs. Les défauts des cristaux utilisés pour la détection ont été caractérisés. Notamment, les dislocations révélées par attaque chimique et par topographie X présentent des arrangements en mur à la surface des échantillons, ces défauts sont majoritairement traversant dans toute l’épaisseur du cristal. Il a ensuite été montré que ces murs de dislocations sont responsables des inhomogénéités de photo-courant sous irradiation par des rayons X et de courant de fuite d’un détecteur à base de CdTe:Cl. De plus, les niveaux pièges dans le gap du CdTe ont été investigués par des méthodes de spectroscopie optique à basse température : les images de cathodoluminescence mettent en évidence le caractère non-radiatif des murs de dislocations, mais ne montrent pas l’apparition de la luminescence Y au niveau de ces défauts, normalement attribuée aux dislocations dans la littérature. Enfin, l’influence des murs de dislocations sur les propriétés de transport des porteurs de charge a été étudiée par la méthode « Ion Beam Induced Current » (IBIC) montrant qu’ils entraînent une diminution de la valeur du produit mobilité-temps de vie des électrons et des trous

In the present Ph.D. thesis, we investigate microstructural defects in a chlorine-doped cadmium telluride crystal (CdTe:Cl), to understand the relationship between defects and performance of CdTe-based radiation detectors. Characterization tools, such as diffraction topography and chemical etching, are used for bulk and surface investigations of the distribution of dislocations. Dislocations are arranged into walls. Most of them appear to cross the whole thickness of the sample. Very good correlation is observed between areas with variations of dark-current and photo-current, and positions of the dislocation walls revealed at the surface of the sample. Then spectroscopic analysis of these defects was performed at low temperatures. It highlighted that dislocation walls induce non-radiative recombination, but it didn’t show any Y luminescence usually attributed to dislocations in the literature. Ion Beam Induced Current (IBIC) measurements were used to evaluate the influence of dislocation walls on charge carrier transport properties. This experiment shows that they reduce the mobility-Iifetime product of the charge carriers. A very clear correlation was, in fact, established between the distribution of the dislocation network and the linear defects revealed by their lower CIE on the device

Advisors/Committee Members: Marrakchi, Ghanem (thesis director).

Subjects/Keywords: CDTE; Caractérisations; Dislocations; Détecteur rayons X; Attaque chimique; IBIC; Photoluminescence; Cathodoluminescence; CDTE; Characterizations; Dislocations; X-ray detector; Chemical etching; IBIC; Photoluminescence

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Buis, C. (2013). Etude des corrélations entre les défauts structuraux et les inhomogénéités spatiales des détecteurs de rayons X à base de CdTe pour l'imagerie médicale : Study of correlation between the structural defects and inhomogeneities of CDTE based radiation detectors used for medical imaging. (Doctoral Dissertation). Saint-Etienne. Retrieved from http://www.theses.fr/2013STET4016

Chicago Manual of Style (16^th Edition):

Buis, Camille. “Etude des corrélations entre les défauts structuraux et les inhomogénéités spatiales des détecteurs de rayons X à base de CdTe pour l'imagerie médicale : Study of correlation between the structural defects and inhomogeneities of CDTE based radiation detectors used for medical imaging.” 2013. Doctoral Dissertation, Saint-Etienne. Accessed March 01, 2021. http://www.theses.fr/2013STET4016.

MLA Handbook (7^th Edition):

Buis, Camille. “Etude des corrélations entre les défauts structuraux et les inhomogénéités spatiales des détecteurs de rayons X à base de CdTe pour l'imagerie médicale : Study of correlation between the structural defects and inhomogeneities of CDTE based radiation detectors used for medical imaging.” 2013. Web. 01 Mar 2021.

Vancouver:

Buis C. Etude des corrélations entre les défauts structuraux et les inhomogénéités spatiales des détecteurs de rayons X à base de CdTe pour l'imagerie médicale : Study of correlation between the structural defects and inhomogeneities of CDTE based radiation detectors used for medical imaging. [Internet] [Doctoral dissertation]. Saint-Etienne; 2013. [cited 2021 Mar 01]. Available from: http://www.theses.fr/2013STET4016.

Council of Science Editors:

Buis C. Etude des corrélations entre les défauts structuraux et les inhomogénéités spatiales des détecteurs de rayons X à base de CdTe pour l'imagerie médicale : Study of correlation between the structural defects and inhomogeneities of CDTE based radiation detectors used for medical imaging. [Doctoral Dissertation]. Saint-Etienne; 2013. Available from: http://www.theses.fr/2013STET4016

23. Garcia Nathan, Tomas Bartolome. Design and implementation of an x-ray colour detection system using the Medipix3RX.

Degree: 2018, University of Manchester

URL: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:314147

► In this work the design and implementation of an x-ray imager system is presented. The design features a direct x-ray detection scheme by making use… (more)

▼ In this work the design and implementation of an x-ray imager system is presented. The design features a direct x-ray detection scheme by making use of a hybrid pixel detector (Medipix3RX). Taking advantage of the capabilities of the Medipix3RX, such as a high resolution, zero dead-time, single photon detection, charge-sharing mode and colour mode. The imager has a better resolution and higher sensitivity compared to using traditional indirect detection schemes. A detailed description of the design process and implementation of the system is presented, which consists of a vacuum chamber containing the sensor, an electronic board for temperature management, conditioning and readout of the sensor and a data processing unit which also handles network connection and communication with clients by acting as a server. A field programmable gate array (FPGA) device is used to implement the readout protocol for the Medipix3RX. Apart from the readout, the FPGA can perform complex image processing functions such as histogram, profiling and image compression at high speeds. The temperature of the sensor is monitored and controlled through a PID algorithm making use of a Peltier cooler, improving the energy resolution and response stability of the sensor. Without implementing data compression techniques, the system is capable of transferring 680 profiles/s or 240 images/s in a continuous mode. A detailed analysis of equalization procedures and tests for all the operation modes of the sensor are presented in this work. Different equalization methods were tested, such as using electronic noise, injected pulses and x-ray photons to perform the equalization. The results of the trade-off of equalization time versus energy resolution are analysed and discussed. One of the tested applications of the system is as an x-ray beam position monitor (XBPM) device for synchrotron light source experiments. The XBPM allows a non-destructive real time measurement of the beam position, size and intensity. A Kapton foil is placed in the beam path scattering radiation towards a pinhole camera setup that allows the sensor to obtain an image of the beam. By using profiles of the synchrotron x-ray beam, high frequency movement of the beam position can be studied. Experiments testing the characteristics of the Medipix3RX are shown in this work. The colour mode capability and its limitations were tested and found to be able to recognize elements by their characteristic x-ray fluorescence. The Medipix3RX dependence to temperature was measured, showing the necessity of controlling the sensor's temperature. Advisors/Committee Members: FOSTER, DAVID DH, Van Silfhout, Roelof, Foster, David.

Subjects/Keywords: Medipix3RX; colour x-ray; x-ray detection; semiconductor detector

…design features a direct x-ray detection scheme by making use of a hybrid pixel detector (… …Indirect detection requires an extra step between the x-ray photons and the detector, for example… …interaction between the x-ray photons and the detector. Direct detection methods yield higher… …detection efficiency than indirect detection methods. Several direct x-ray detector Application… …shape of the Medipix3RX. 1) detector area of 256 x 256 pixels, 2) chip periphery and…

10 more images…

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Garcia Nathan, T. B. (2018). Design and implementation of an x-ray colour detection system using the Medipix3RX. (Doctoral Dissertation). University of Manchester. Retrieved from http://www.manchester.ac.uk/escholar/uk-ac-man-scw:314147

Chicago Manual of Style (16^th Edition):

Garcia Nathan, Tomas Bartolome. “Design and implementation of an x-ray colour detection system using the Medipix3RX.” 2018. Doctoral Dissertation, University of Manchester. Accessed March 01, 2021. http://www.manchester.ac.uk/escholar/uk-ac-man-scw:314147.

MLA Handbook (7^th Edition):

Garcia Nathan, Tomas Bartolome. “Design and implementation of an x-ray colour detection system using the Medipix3RX.” 2018. Web. 01 Mar 2021.

Vancouver:

Garcia Nathan TB. Design and implementation of an x-ray colour detection system using the Medipix3RX. [Internet] [Doctoral dissertation]. University of Manchester; 2018. [cited 2021 Mar 01]. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:314147.

Council of Science Editors:

Garcia Nathan TB. Design and implementation of an x-ray colour detection system using the Medipix3RX. [Doctoral Dissertation]. University of Manchester; 2018. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:314147

24. Garcia Nathan, Tomas. Design and implementation of an X-ray colour detection system using the Medipix3RX.

Degree: PhD, 2018, University of Manchester

URL: https://www.research.manchester.ac.uk/portal/en/theses/design-and-implementation-of-an-xray-colour-detection-system-using-the-medipix3rx(09387f5f-c53f-4045-a60f-5b5724eb6fd2).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.779565

► In this work the design and implementation of an x-ray imager system is presented. The design features a direct x-ray detection scheme by making use… (more)

▼ In this work the design and implementation of an x-ray imager system is presented. The design features a direct x-ray detection scheme by making use of a hybrid pixel detector (Medipix3RX). Taking advantage of the capabilities of the Medipix3RX, such as a high resolution, zero dead-time, single photon detection, charge-sharing mode and colour mode. The imager has a better resolution and higher sensitivity compared to using traditional indirect detection schemes. A detailed description of the design process and implementation of the system is presented, which consists of a vacuum chamber containing the sensor, an electronic board for temperature management, conditioning and readout of the sensor and a data processing unit which also handles network connection and communication with clients by acting as a server. A field programmable gate array (FPGA) device is used to implement the readout protocol for the Medipix3RX. Apart from the readout, the FPGA can perform complex image processing functions such as histogram, profiling and image compression at high speeds. The temperature of the sensor is monitored and controlled through a PID algorithm making use of a Peltier cooler, improving the energy resolution and response stability of the sensor. Without implementing data compression techniques, the system is capable of transferring 680 profiles/s or 240 images/s in a continuous mode. A detailed analysis of equalization procedures and tests for all the operation modes of the sensor are presented in this work. Different equalization methods were tested, such as using electronic noise, injected pulses and x-ray photons to perform the equalization. The results of the trade-off of equalization time versus energy resolution are analysed and discussed. One of the tested applications of the system is as an x-ray beam position monitor (XBPM) device for synchrotron light source experiments. The XBPM allows a non-destructive real time measurement of the beam position, size and intensity. A Kapton foil is placed in the beam path scattering radiation towards a pinhole camera setup that allows the sensor to obtain an image of the beam. By using profiles of the synchrotron x-ray beam, high frequency movement of the beam position can be studied. Experiments testing the characteristics of the Medipix3RX are shown in this work. The colour mode capability and its limitations were tested and found to be able to recognize elements by their characteristic x-ray fluorescence. The Medipix3RX dependence to temperature was measured, showing the necessity of controlling the sensor's temperature.

Subjects/Keywords: Medipix3RX; colour x-ray; x-ray detection; semiconductor detector

…design features a direct x-ray detection scheme by making use of a hybrid pixel detector (… …Indirect detection requires an extra step between the x-ray photons and the detector, for example… …interaction between the x-ray photons and the detector. Direct detection methods yield higher… …detection efficiency than indirect detection methods. Several direct x-ray detector Application… …shape of the Medipix3RX. 1) detector area of 256 x 256 pixels, 2) chip periphery and…

10 more images…

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Garcia Nathan, T. (2018). Design and implementation of an X-ray colour detection system using the Medipix3RX. (Doctoral Dissertation). University of Manchester. Retrieved from https://www.research.manchester.ac.uk/portal/en/theses/design-and-implementation-of-an-xray-colour-detection-system-using-the-medipix3rx(09387f5f-c53f-4045-a60f-5b5724eb6fd2).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.779565

Chicago Manual of Style (16^th Edition):

Garcia Nathan, Tomas. “Design and implementation of an X-ray colour detection system using the Medipix3RX.” 2018. Doctoral Dissertation, University of Manchester. Accessed March 01, 2021. https://www.research.manchester.ac.uk/portal/en/theses/design-and-implementation-of-an-xray-colour-detection-system-using-the-medipix3rx(09387f5f-c53f-4045-a60f-5b5724eb6fd2).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.779565.

MLA Handbook (7^th Edition):

Garcia Nathan, Tomas. “Design and implementation of an X-ray colour detection system using the Medipix3RX.” 2018. Web. 01 Mar 2021.

Vancouver:

Garcia Nathan T. Design and implementation of an X-ray colour detection system using the Medipix3RX. [Internet] [Doctoral dissertation]. University of Manchester; 2018. [cited 2021 Mar 01]. Available from: https://www.research.manchester.ac.uk/portal/en/theses/design-and-implementation-of-an-xray-colour-detection-system-using-the-medipix3rx(09387f5f-c53f-4045-a60f-5b5724eb6fd2).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.779565.

Council of Science Editors:

Garcia Nathan T. Design and implementation of an X-ray colour detection system using the Medipix3RX. [Doctoral Dissertation]. University of Manchester; 2018. Available from: https://www.research.manchester.ac.uk/portal/en/theses/design-and-implementation-of-an-xray-colour-detection-system-using-the-medipix3rx(09387f5f-c53f-4045-a60f-5b5724eb6fd2).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.779565

25. Konstantinidis, Anastasios. Evaluation of digital X-ray detectors for medical imaging applications.

Degree: 2011, Institutes outside Greece; Ιδρύματα Εξωτερικού

URL: http://hdl.handle.net/10442/hedi/35611

►

Digital x-ray detectors are now the detector of choice in many X-ray examinations. They have been accepted into clinical practice over the past decade but… (more)

▼

Digital x-ray detectors are now the detector of choice in many X-ray examinations. They have been accepted into clinical practice over the past decade but there are still ongoing developments in the technology. Complementary metal oxide semiconductor (CMOS) active pixel sensors (APS) are a novel digital technology that offers advantages compared to some of the more established approaches (charge-coupled devices (CCD), thin film transistor arrays (TFT) and CMOS passive pixel sensors (PPS)). This thesis looks at the performance of these new sensors and attempts to identify their role in future medical imaging applications.Standard electro-optical and x-ray performance evaluations of two novel CMOS APS, namely the Large Area Sensor (LAS) and Dexela CMOS x-ray detector, are presented. The evaluation was made in terms of the photon transfer curve (PTC), the modulation transfer function (MTF), the normalized noise power spectrum (NNPS) and the resultant detective quantum efficiency (DQE). Modifications were introduced to extend the standard methods to overcome technical limitations. The performance of these detectors was compared to three commercial systems (Remote RadEye HR (CMOS APS), Hamamatsu C9732DK (CMOS PPS) and Anrad SMAM (a-Se TFT)) at beam qualities (28 kV for mammography and 52 kV and 74 kV for general radiography) based on the IEC standards. Both the LAS and Dexela CMOS detectors demonstrate enhanced performance. The effect of the CMOS APS inherent nonlinearity on the x-ray performance was also evaluated. Finally, the measured performance parameters were used to simulate images for different mammographic imaging tasks in order to establish possible areas of application for the new sensors. Two software phantoms (one representing a 3-D breast and the other the CDMAM test tool) were used to simulate a range of mammographic conditions. The results show that both novel CMOS APS detectors offer high image quality compared to the commercial detector systems.

Οι ψηφιακοί ανιχνευτές ακτίνων Χ είναι πλέον διαδεδομένοι σε αρκετές εξετάσεις με ακτίνες Χ. Άρχισαν να χρησιμοποιούνται στην κλινική ιατρική την τελευταία δεκαετία αλλά εξακολουθούν να υπάρχουν συνεχείς εξελίξεις στην τεχνολογία. Η τεχνολογία συμπληρωματικών ημιαγωγών μεταλλικού οξειδίου (complementary metal oxide semiconductor - CMOS) με αισθητήρα ενεργού εικονοστοιχείου (active pixel sensor - APS) είναι μια νέα ψηφιακή τεχνολογία που προσφέρει πλεονεκτήματα σε σύγκριση με μερικές από τις πιο καθιερωμένες τεχνολογίες (π.χ. α) συσκευές συζευγμένου φορτίου (charge-coupled devices - CCD), β) ανιχνευτές με τρανζίστορ λεπτών υμενίων (thin film transistor - TFT) και γ) CMOS με αισθητήρα παθητικού εικονοστοιχείου (passive pixel sensor - PPS)). Η συγκεκριμένη διδακτορική διατριβή εξετάζει την απόδοση των ψηφιακών ανιχνευτών νέας τεχνολογίας και επιχειρεί να προσδιορίσει το ρόλο τους σε μελλοντικές εφαρμογές ιατρικής απεικόνισης.Πιο συγκεκριμένα, παρουσιάζονται αξιολογήσεις (με χρήση ορατών φωτονίων και ακτίνων Χ) απόδοσης δύο νέων ανιχνευτών CMOS APS, ονομαστικά…

Subjects/Keywords: Ιατρική απεικόνιση με χρήση ακτίνων Χ; Ψηφιακός ανιχνευτής ακτίνων Χ; Ποιότητα εικόνας; Ανιχνευτική κβαντική αποδοτικότητα; Medical X-ray imaging; Digital X-ray detector; Image quality; Detective quantum efficiency

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Konstantinidis, A. (2011). Evaluation of digital X-ray detectors for medical imaging applications. (Thesis). Institutes outside Greece; Ιδρύματα Εξωτερικού. Retrieved from http://hdl.handle.net/10442/hedi/35611

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

Chicago Manual of Style (16^th Edition):

Konstantinidis, Anastasios. “Evaluation of digital X-ray detectors for medical imaging applications.” 2011. Thesis, Institutes outside Greece; Ιδρύματα Εξωτερικού. Accessed March 01, 2021. http://hdl.handle.net/10442/hedi/35611.

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

MLA Handbook (7^th Edition):

Konstantinidis, Anastasios. “Evaluation of digital X-ray detectors for medical imaging applications.” 2011. Web. 01 Mar 2021.

Vancouver:

Konstantinidis A. Evaluation of digital X-ray detectors for medical imaging applications. [Internet] [Thesis]. Institutes outside Greece; Ιδρύματα Εξωτερικού; 2011. [cited 2021 Mar 01]. Available from: http://hdl.handle.net/10442/hedi/35611.

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

Council of Science Editors:

Konstantinidis A. Evaluation of digital X-ray detectors for medical imaging applications. [Thesis]. Institutes outside Greece; Ιδρύματα Εξωτερικού; 2011. Available from: http://hdl.handle.net/10442/hedi/35611

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

University of Oulu

26. Wang, H. (Hongbo). Silicon X-ray smart sensor micromodule and microsystem.

Degree: 2002, University of Oulu

URL: http://urn.fi/urn:isbn:951426746X

► Abstract Research on X-ray imaging sensors and systems have been carried out for several decades. To make these X-ray scanners smaller with better performance and… (more)

Subjects/Keywords: X-ray imaging; active pixel sensor; photodiode; silicon detector

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Wang, H. (. (2002). Silicon X-ray smart sensor micromodule and microsystem. (Doctoral Dissertation). University of Oulu. Retrieved from http://urn.fi/urn:isbn:951426746X

Chicago Manual of Style (16^th Edition):

Wang, H (Hongbo). “Silicon X-ray smart sensor micromodule and microsystem.” 2002. Doctoral Dissertation, University of Oulu. Accessed March 01, 2021. http://urn.fi/urn:isbn:951426746X.

MLA Handbook (7^th Edition):

Wang, H (Hongbo). “Silicon X-ray smart sensor micromodule and microsystem.” 2002. Web. 01 Mar 2021.

Vancouver:

Wang H(. Silicon X-ray smart sensor micromodule and microsystem. [Internet] [Doctoral dissertation]. University of Oulu; 2002. [cited 2021 Mar 01]. Available from: http://urn.fi/urn:isbn:951426746X.

Council of Science Editors:

Wang H(. Silicon X-ray smart sensor micromodule and microsystem. [Doctoral Dissertation]. University of Oulu; 2002. Available from: http://urn.fi/urn:isbn:951426746X

Texas A&M University

27. Rogers, Jeremy 1987-. Modeling Study of Proposed Field Calibration Source Using K-40 Source and High-Z Targets for Sodium Iodide Detector.

Degree: MS, Health Physics, 2012, Texas A&M University

URL: http://hdl.handle.net/1969.1/148187

► The Department of Energy (DOE) has ruled that all sealed radioactive sources, even those considered exempt under Nuclear Regulatory Commission regulations, are subject to radioactive… (more)

▼ The Department of Energy (DOE) has ruled that all sealed radioactive sources, even those considered exempt under Nuclear Regulatory Commission regulations, are subject to radioactive material controls. However, sources based on the primordial isotope potassium-40 (40K) are not subject to these restrictions. Potassium-40’s beta spectrum and 1460.8 keV gamma ray can be used to induce K-shell fluorescence x rays in high-Z metals between 60 and 80 keV. A gamma ray calibration source is thus proposed that uses potassium chloride salt and a high-Z metal to create a two-point calibration for a sodium iodide field gamma spectroscopy instrument. The calibration source was designed in collaboration with Sandia National Laboratory using the Monte Carlo N-Particle eXtended (MCNPX) transport code. The x ray production was maximized while attempting to preserve the detector system’s sensitivity to external sources by minimizing the count rate and shielding effect of the calibration source. Since the source is intended to be semi-permanently fixed to the detector, the weight of the calibration source was also a design factor. Two methods of x-ray production were explored. First, a thin high-Z layer (HZL) was interposed between the detector and the potassium chloride-urethane source matrix. Second, bismuth metal powder was homogeneously mixed with a urethane binding agent to form a potassium chloride-bismuth matrix (KBM). The two methods were directly compared using a series of simulations, including their x ray peak strengths, pulse-height spectral characteristics, and response to a simulated background environment. The bismuth-based source was selected as the development model because it is cheap, nontoxic, and outperforms the high-Z layer method in simulation. The overall performance for the bismuth-based source was significantly improved by splitting the calibration source longitudinally into two halves and placing them on either side of the detector. The performance was improved further by removing the binding agent and simulating a homogeneous mixture of potassium chloride and bismuth powder in a 0.1 cm plastic casing. The split plastic-encased potassium chloride-bismuth matrix would serve as a light, cheap, field calibration source that is not subject to DOE restrictions. Advisors/Committee Members: Marianno, Craig M (advisor), Guetersloh, Stephen B (committee member), Khatri, Sunil P (committee member).

Subjects/Keywords: Sodium iodide (NaI) detector; Monte Carlo simulation; Gamma spectroscopy; X ray fluorescence; Potassium-based calibration source; Potassium chloride; Potassium-40

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Rogers, J. 1. (2012). Modeling Study of Proposed Field Calibration Source Using K-40 Source and High-Z Targets for Sodium Iodide Detector. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/148187

Chicago Manual of Style (16^th Edition):

Rogers, Jeremy 1987-. “Modeling Study of Proposed Field Calibration Source Using K-40 Source and High-Z Targets for Sodium Iodide Detector.” 2012. Masters Thesis, Texas A&M University. Accessed March 01, 2021. http://hdl.handle.net/1969.1/148187.

MLA Handbook (7^th Edition):

Rogers, Jeremy 1987-. “Modeling Study of Proposed Field Calibration Source Using K-40 Source and High-Z Targets for Sodium Iodide Detector.” 2012. Web. 01 Mar 2021.

Vancouver:

Rogers J1. Modeling Study of Proposed Field Calibration Source Using K-40 Source and High-Z Targets for Sodium Iodide Detector. [Internet] [Masters thesis]. Texas A&M University; 2012. [cited 2021 Mar 01]. Available from: http://hdl.handle.net/1969.1/148187.

Council of Science Editors:

Rogers J1. Modeling Study of Proposed Field Calibration Source Using K-40 Source and High-Z Targets for Sodium Iodide Detector. [Masters Thesis]. Texas A&M University; 2012. Available from: http://hdl.handle.net/1969.1/148187

28. Adeagbo, Emmanuel Bamise 1988-. X-RAY INDUCED EFFECT ON CHARGE CARRIER TRAPPING LIFETIME OF a-Se PHOTOCONDUCTORS AND THE RECOVERY PROCESS.

Degree: 2018, University of Saskatchewan

URL: http://hdl.handle.net/10388/9776

► Amorphous selenium (a-Se) alloy x-ray detectors are currently used in commercial mammographic detectors for breast cancer detection and diagnosis. They have been only recently commercialized… (more)

▼ Amorphous selenium (a-Se) alloy x-ray detectors are currently used in commercial mammographic detectors for breast cancer detection and diagnosis. They have been only recently commercialized and there are now at least five companies manufacturing these detectors. This work focuses on the study of the X-ray induce effects on the carrier trapping lifetime in a-Se, and the recovery process of the X-ray induced damage in the bulk of a-Se samples. The x-ray dose effect on the carrier trapping lifetime was studied alongside the temperature effect on the induced x-ray damage and recovery process. The carrier trapping lifetime reduces as the accumulated dose deposited in the a-Se samples increases. Upon the cessation of x-ray exposure, carrier lifetime recovered slowly (over many hours) back to its original state. The damage was not permanent. Several a-Se detectors samples have been exposed to high doses of x-ray and the recovery process has been observed under different temperature, 23.5 °C and 35.5 °C. The time of flight (TOF) measurement technique was employed to measure the carrier drift mobility  and the interrupted filed time of flight (IFTOF) technique was used to measure the carrier trapping lifetime . All samples used in this project are pure a-Se for hole transport measurements, a-Se: 0.3%: 2.5ppm Cl and a-Se: 0.5%: 10ppm Cl for electron transport measurements. Sample thickness ranges from 50 μm to 200 μm with a variance of ±5 μm at different positions on the sample. The applied dose rate during the x-ray irradiation ranges from 1.9 Gy/s to 2.5 Gy/s. The difference in dose rate does not affect the change in the hole trapping lifetime but has a non-significant effect on the electron trapping lifetime. The rate of decrease in the hole normalized lifetime is more rapid at 35.5 °C than at room temperature (23.5 °C). The recovery processes were also observed to be more rapid at the higher temperature. Advisors/Committee Members: Kasap, Safa, Li, Chen, Michael, Bradley, Anh, Dinh.

Subjects/Keywords: X-ray; Detector; photoconductor; lifetime; charge carriers

…consists of the x-ray tube, collimator, and x-ray detector �� .. 2 Figure 1.2… …4 Figure 1.4: A typical structure of indirect conversion x-ray detector [59]… …of a pixel in an a-Se direct conversion x-ray detector. After Kasap [6]… …processing and display [7]. X-Ray X-Ray Detector Patient Collimator High Voltage… …collimator and x-ray detector. (After [8]) 2 1.2 Digital X-ray Imaging As…

10 more images…

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Adeagbo, E. B. 1. (2018). X-RAY INDUCED EFFECT ON CHARGE CARRIER TRAPPING LIFETIME OF a-Se PHOTOCONDUCTORS AND THE RECOVERY PROCESS. (Thesis). University of Saskatchewan. Retrieved from http://hdl.handle.net/10388/9776

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

Chicago Manual of Style (16^th Edition):

Adeagbo, Emmanuel Bamise 1988-. “X-RAY INDUCED EFFECT ON CHARGE CARRIER TRAPPING LIFETIME OF a-Se PHOTOCONDUCTORS AND THE RECOVERY PROCESS.” 2018. Thesis, University of Saskatchewan. Accessed March 01, 2021. http://hdl.handle.net/10388/9776.

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

MLA Handbook (7^th Edition):

Adeagbo, Emmanuel Bamise 1988-. “X-RAY INDUCED EFFECT ON CHARGE CARRIER TRAPPING LIFETIME OF a-Se PHOTOCONDUCTORS AND THE RECOVERY PROCESS.” 2018. Web. 01 Mar 2021.

Vancouver:

Adeagbo EB1. X-RAY INDUCED EFFECT ON CHARGE CARRIER TRAPPING LIFETIME OF a-Se PHOTOCONDUCTORS AND THE RECOVERY PROCESS. [Internet] [Thesis]. University of Saskatchewan; 2018. [cited 2021 Mar 01]. Available from: http://hdl.handle.net/10388/9776.

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

Council of Science Editors:

Adeagbo EB1. X-RAY INDUCED EFFECT ON CHARGE CARRIER TRAPPING LIFETIME OF a-Se PHOTOCONDUCTORS AND THE RECOVERY PROCESS. [Thesis]. University of Saskatchewan; 2018. Available from: http://hdl.handle.net/10388/9776

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

University of Guelph

29. Heirwegh, Christopher Michael. Studies of Light Element X-Ray Fundamental Parameters Used in PIXE Analysis.

Degree: PhD, Department of Physics, 2014, University of Guelph

URL: https://atrium.lib.uoguelph.ca/xmlui/handle/10214/8115

► New measurements of fundamental parameters (FP), used in reference-free particle induced X-ray emission (PIXE) analysis of materials, may be assisted by incorporating both state-of-the-art spectral… (more)

▼ New measurements of fundamental parameters (FP), used in reference-free particle induced X-ray emission (PIXE) analysis of materials, may be assisted by incorporating both state-of-the-art spectral processing methods and methodologies that have minimal reliance upon other FPs. Under this heading, several light element FPs have been investigated. A collection of monochromatic spectra[73] have been characterized in terms of the origins and lineshapes of features arising due solely to photon and electron interactions in the silicon detector crystal. Through the assistance of Monte Carlo simulation results, state-of-the-art fit treatments were applied to these spectra using a fit routine that combined both non-linear least squares and manual optimization. The fitted spectra were used to derive a new estimate of the K X-ray fluorescence yield (ωK) of Si. This was done using a geometrical expression that relates ωK to the area ratio of the escape to primary peaks taken from the spectra. The final result (0.0504 ± 0.0015) was realized through assistance from new low energy mass-attenuation coefficient (MAC) data. The accuracy of low-energy (1–2 keV) MACs of light elements was assessed using an approach incorporating PIXE measurements on pure element (Mg, Al and Si) and oxide (MgO, Al2O3 and SiO2) targets. Calculated spectrometer efficiency constants, compared between target pairs (eg, Si vs. SiO2), allow many FPs to cancel. Any non-zero difference in the comparison indicates errors associated with the remaining FPs. A resultant 4–6% discrepancy was attributed to the use of XCOM[10] MACs but this was reduced to 0.5–2.5% using FFAST[33] MACs. Additional measurements, performed on silicate micro-probe standards, were analyzed using the same comparative approach. A light element efficiency-constant discrepancy of 7–9% was observed and attributed to the use of XCOM MACs. This was reduced to 0.5–3.5% using FFAST MACs but was reduced further to −0.5–2% using a combination of XCOM and FFAST MACs. This result suggested that the combination database was superior. Advisors/Committee Members: Campbell, John L. (Iain) (advisor).

Subjects/Keywords: PIXE; X-ray; emission; fluorescence yield; detector; response function; light element; FFAST; XCOM; mass attenuation coefficient; fundamental parameters

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Heirwegh, C. M. (2014). Studies of Light Element X-Ray Fundamental Parameters Used in PIXE Analysis. (Doctoral Dissertation). University of Guelph. Retrieved from https://atrium.lib.uoguelph.ca/xmlui/handle/10214/8115

Chicago Manual of Style (16^th Edition):

Heirwegh, Christopher Michael. “Studies of Light Element X-Ray Fundamental Parameters Used in PIXE Analysis.” 2014. Doctoral Dissertation, University of Guelph. Accessed March 01, 2021. https://atrium.lib.uoguelph.ca/xmlui/handle/10214/8115.

MLA Handbook (7^th Edition):

Heirwegh, Christopher Michael. “Studies of Light Element X-Ray Fundamental Parameters Used in PIXE Analysis.” 2014. Web. 01 Mar 2021.

Vancouver:

Heirwegh CM. Studies of Light Element X-Ray Fundamental Parameters Used in PIXE Analysis. [Internet] [Doctoral dissertation]. University of Guelph; 2014. [cited 2021 Mar 01]. Available from: https://atrium.lib.uoguelph.ca/xmlui/handle/10214/8115.

Council of Science Editors:

Heirwegh CM. Studies of Light Element X-Ray Fundamental Parameters Used in PIXE Analysis. [Doctoral Dissertation]. University of Guelph; 2014. Available from: https://atrium.lib.uoguelph.ca/xmlui/handle/10214/8115

New Jersey Institute of Technology

30. Wang, Yuhao. Development of x-ray holography methods for structure determination : Application of high speed detectors and novel numerical methods.

Degree: PhD, Committee for the Interdisciplinary Program in Materials Science and Engineering, 2012, New Jersey Institute of Technology

URL: https://digitalcommons.njit.edu/dissertations/289

► Holographic methods show much promise to enable direct determination of atomic structure with minimal assumptions and approximations. The approach can, in principle, provide three… (more)

Subjects/Keywords: X-ray flourescence holography; Direct method; Multi-element detector; Crystal structure determination; Spherical harmonic analysis; Inverse problem; Materials Science and Engineering

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Wang, Y. (2012). Development of x-ray holography methods for structure determination : Application of high speed detectors and novel numerical methods. (Doctoral Dissertation). New Jersey Institute of Technology. Retrieved from https://digitalcommons.njit.edu/dissertations/289

Chicago Manual of Style (16^th Edition):

Wang, Yuhao. “Development of x-ray holography methods for structure determination : Application of high speed detectors and novel numerical methods.” 2012. Doctoral Dissertation, New Jersey Institute of Technology. Accessed March 01, 2021. https://digitalcommons.njit.edu/dissertations/289.

MLA Handbook (7^th Edition):

Wang, Yuhao. “Development of x-ray holography methods for structure determination : Application of high speed detectors and novel numerical methods.” 2012. Web. 01 Mar 2021.

Vancouver:

Wang Y. Development of x-ray holography methods for structure determination : Application of high speed detectors and novel numerical methods. [Internet] [Doctoral dissertation]. New Jersey Institute of Technology; 2012. [cited 2021 Mar 01]. Available from: https://digitalcommons.njit.edu/dissertations/289.

Council of Science Editors:

Wang Y. Development of x-ray holography methods for structure determination : Application of high speed detectors and novel numerical methods. [Doctoral Dissertation]. New Jersey Institute of Technology; 2012. Available from: https://digitalcommons.njit.edu/dissertations/289

		in
And / Or
		in
And / Or
		in
And / Or
		in

Open Access Theses and Dissertations