Hagen, CK;
Endrizzi, M;
Diemoz, PD;
Olivo, A;
(2016)
Reverse projection retrieval in edge illumination x-ray phase contrast computed tomography.
Journal of Physics D: Applied Physics
, 49
(25)
, Article 255501. 10.1088/0022-3727/49/25/255501.
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Hagen et al 2016 Reverse projection retrieval in edge illumination x-ray phase contrast computed tomography VoR.pdf Download (1MB) |
Abstract
Edge illumination (EI) x-ray phase contrast computed tomography (CT) can provide three-dimensional distributions of the real and imaginary parts of the complex refractive index (n = 1 d + ib) of the sample. Phase retrieval, i.e. the separation of attenuation and refraction data from projections that contain a combination of both, is a key step in the image reconstruction process. In EI-based x-ray phase contrast CT, this is conventionally performed on the basis of two projections acquired in opposite illumination configurations (i.e. with different positions of the pre-sample mask) at each CT angle. Displacing the pre-sample mask at each projection makes the scan susceptible to motor-induced misalignment and prevents a continuous sample rotation. We present an alternative method for the retrieval of attenuation and refraction data that does not require repositioning the pre-sample mask. The method is based on the reverse projection relation published by Zhu et al. (2010) for grating interferometry-based x-ray phase contrast CT. We use this relation to derive a simplified acquisition strategy that allows acquiring data with a continuous sample rotation, which can reduce scan time when combined with a fast read-out detector. Besides discussing the theory and the necessary alignment of the experimental setup, we present tomograms obtained with reverse projection retrieval and demonstrate their agreement with those obtained with the conventional EI retrieval.
| Type: | Article |
|---|---|
| Title: | Reverse projection retrieval in edge illumination x-ray phase contrast computed tomography |
| Location: | UK |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1088/0022-3727/49/25/255501 |
| Publisher version: | http://dx.doi.org/10.1088/0022-3727/49/25/255501 |
| Language: | English |
| Additional information: | Copyright © 2016 IOP Publishing Ltd. Original content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence (CC BY 3.0) (https://creativecommons.org/licenses/by/3.0/). Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. |
| Keywords: | phase contrast imaging, computed tomography, phase retrieval, x-ray imaging |
| 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/1489674 |
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