Tracking based, high-resolution single-shot multimodal X-ray imaging in the laboratory enabled by the subpixel resolution capabilities of the MÖNCH detector

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Tracking based, high-resolution single-shot multimodal X-ray imaging in the laboratory enabled by the subpixel resolution capabilities of the MÖNCH detector

Dreier, ES; Bergamaschi, A; Kallon, GK; Brönnimann, R; Olsen, UL; Olivo, A; Endrizzi, M; (2020) Tracking based, high-resolution single-shot multimodal X-ray imaging in the laboratory enabled by the subpixel resolution capabilities of the MÖNCH detector. Applied Physics Letters , 117 , Article 264101. 10.1063/5.0027763. Green open access

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Abstract

The simultaneous retrieval of X-ray attenuation, phase, and scattering using multimodal imaging techniques is finding increased use in a range of applications, from medicine to materials science. Most techniques rely on the mechanical movement of an optical element (e.g. a grating or a mask) to obtain the multi-modal images. While single-shot approaches exist, they typically employ detector pixels smaller than the grating period, often with low detection efficiency, and are limited in resolution unless either the sample or the optical element is displaced in various positions and multiple frames are collected. In this paper, we replace mechanical motion with the MÖNCH detector’s capability to reach sub-pixel resolutions by interpolating between neighbouring pixels collecting the charge generated by a single X-ray event. This enabled us to obtain the pilot demonstration of a laboratory-based high-resolution, single-shot multimodal imaging technique capable of simultaneously retrieving attenuation and directional differential phase and scatter images, without any mechanical movement. We show that our proof-of-concept setup enables a single-shot resolution of 19.5 µm, and that the resulting images provide sufficient information to produce a reliable sample thickness map. Furthermore, we demonstrate that the setup is capable of producing single-shot directional scattering images, while leaving open the option to further increase the resolution by using sample dithering.

Type:	Article
Title:	Tracking based, high-resolution single-shot multimodal X-ray imaging in the laboratory enabled by the subpixel resolution capabilities of the MÖNCH detector
Open access status:	An open access version is available from UCL Discovery
DOI:	10.1063/5.0027763
Publisher version:	https://doi.org/10.1063/5.0027763
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.
Keywords:	Multi-modal x-ray imaging, phase-based imaging, single-shot approaches, resolution enhancement
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/10117658