Ha, Amy Quynh;
(2022)
On the opportunities and challenges provided by mask- based x-ray micro-CT.
Masters thesis (M.Phil), UCL (University College London).
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Abstract
Edge Illumination (EI) is one of several X-ray Phase Contrast Imaging (XPCI) techniques capable of providing multi-modal images, revealing structures in objects that can be difficult to image using the conventional, absorption-based x-ray method. The EI method is underpinned by the use of masks in the scanner, one to split the beam into an array of beamlets, and another one to create sharp edges in front of a pixelated detector. The study presented in this thesis explores the pros and cons of using those masks. In the main chapter, computed tomography (CT) scans were taken of a wooden pencil using an x-ray imaging setup without masks, one mask, and two masks. It was verified that the use of one and two masks increases the spatial resolution and CNR, respectively, compared to a mask-less approach. However, a major drawback associated with the use of masks are that scan times are typically long. In this context, this thesis discusses recently developed approaches to facilitate scan time reduction in EI, one being Cycloidal CT – a sampling scheme which aims to improve speed while maintaining high resolution.
| Type: | Thesis (Masters) |
|---|---|
| Qualification: | M.Phil |
| Title: | On the opportunities and challenges provided by mask- based x-ray micro-CT |
| Open access status: | An open access version is available from UCL Discovery |
| Language: | English |
| Additional information: | Copyright © The Author 2022. Original content in this thesis is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International (CC BY-NC 4.0) Licence (https://creativecommons.org/licenses/by-nc/4.0/). Any third-party copyright material present remains the property of its respective owner(s) and is licensed under its existing terms. Access may initially be restricted at the author’s request. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Med Phys and Biomedical Eng |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10159986 |
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