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X-ray micro-computed tomography with amplitude modulated beams (beam tracking, edge illumination): opportunities, challenges, and outlook

Hagen, Charlotte K; Lioliou, Grammatiki; Roche i Morgo, Oriol; Shah, Khushal; Zekavat, Amir; Astolfo, Alberto; Munro, Peter; ... Olivo, Alessandro; + view all (2024) X-ray micro-computed tomography with amplitude modulated beams (beam tracking, edge illumination): opportunities, challenges, and outlook. In: Müller, Bert and Wang, Ge, (eds.) Proceedings of the Developments in X-Ray Tomography XV. (pp. pp. 1-6). Society of Photo-Optical Instrumentation Engineers (SPIE) Green open access

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Abstract

In recent years, x-ray micro-computed tomography (micro-CT) systems with amplitude modulated beams have gained global interest. These systems feature a modulator, that is, an x-ray opaque mask with periodically spaced apertures, in front of the sample, creating an array of spatially separated beamlets. The approach offers x-ray phase contrast imaging (XPCI), which improves the contrast-to-noise ratio and reveals the presence of sub-resolution inhomogeneities by capturing, respectively, refraction and ultra-small angle scattering (dark field signal) alongside x-ray attenuation. Additionally, the modulator can increase spatial resolution, as the narrow beamlets can transfer higher spatial frequencies without requiring geometric magnification. This brief communication reviews the working principle of the approach and comments on a remaining challenge (relatively long scan times).

Type: Proceedings paper
Title: X-ray micro-computed tomography with amplitude modulated beams (beam tracking, edge illumination): opportunities, challenges, and outlook
Event: Developments in X-Ray Tomography XV
Location: San Diego, California, United States
Dates: 18th-23rd August 2024
Open access status: An open access version is available from UCL Discovery
DOI: 10.1117/12.3029040
Publisher version: http://dx.doi.org/10.1117/12.3029040
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher's terms and conditions.
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/10199367
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