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Recent developments in fly scan methods for phase and multi-contrast x-ray micro-CT based on amplitude modulated beams

Lioliou, Grammatiki; Roche i Morgó, Oriol; Astolfo, Alberto; Zekavat, Amir Reza; Endrizzi, Marco; Bate, David; Cipiccia, Silvia; ... Hagen, Charlotte; + view all (2024) Recent developments in fly scan methods for phase and multi-contrast x-ray micro-CT based on amplitude modulated beams. Tomography of Materials and Structures , 5 , Article 100034. 10.1016/j.tmater.2024.100034. Green open access

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Abstract

Beam tracking and edge illumination are phase contrast imaging techniques that rely on amplitude modulated x-ray beams to generate sensitivity to refraction and scattering. While each technique has its advantage (“single shot” three-contrast imaging in beam tracking; the ability to work with relatively large pixels in edge illumination), they also share a common drawback, namely that the modulator shields parts of the sample and, thus, prevents those areas from contributing to the image (under-sampling). Sample stepping, by which frames are acquired with the sample in a different position relative to the modulator (sometimes referred to as “dithering”) can produce well-sampled images. However, in computed tomography (CT), stepping must be performed at each rotation angle, enforcing step-and-shoot acquisitions and leading to long scan times. To enable faster acquisitions, fly scan compatible scanning schemes based on “roto-translating” the sample in the modulated x-ray beam were recently developed. This article reviews these schemes and provides practical guidance for their implementation.

Type: Article
Title: Recent developments in fly scan methods for phase and multi-contrast x-ray micro-CT based on amplitude modulated beams
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.tmater.2024.100034
Publisher version: http://dx.doi.org/10.1016/j.tmater.2024.100034
Language: English
Additional information: © 2024 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
Keywords: X-ray micro-computed tomography, Phase contrast imaging, Fly scans, Rapid scanning, High-throughput scanning, Methods development
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
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/10197178
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