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).

Preview

Text On the opportunities and challenges provided by mask-based x-ray micro-CT-(Corrected)_AmyHa.pdf - Submitted Version Download (5MB) | Preview

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.

Download activity - last month

Export as JSONXMLCSV

Download activity - last 12 months

Export as JSONCSVXML

Downloads by country - last 12 months

Export as JSONXMLCSV

Archive Staff Only

View Item