Navarrete, C;
Procz, S;
Schültz, MK;
Roque, G;
Fey, J;
Avila, C;
Olivo, A;
(2020)
Spectral X-ray phase contrast imaging with a CdTe photon-counting detector.
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
, 971
, Article 164098. 10.1016/j.nima.2020.164098.
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Abstract
The present study focuses on the implementation of two X-ray phase contrast imaging (XPCI) techniques: free-space propagation (FSP) and single mask edge illumination (SM-EI) with a microfocus polychromatic X-ray source and a Timepix3 photon-counting detector with a CdTe sensor. This detector offers high spatial resolution, high detection efficiency and it is able to simultaneously record information about Time-over-Threshold (ToT) and Time-of-Arrival (ToA) for each X-ray photon. All these features play a key role in enabling an improvement of XPCI image quality, especially through spectral analysis, since it is possible to measure the energy of each incident X-ray photon. Measurements of phase contrast and contrast-to-noise ratio (CNR) are presented for different energy bins within the typical spectrum of soft X-ray imaging. It is shown that a significant enhancement of XPCI image quality can be obtained, for both implemented techniques, by performing pixel clustering to correct for charge sharing and by introducing some degree of energy-weighting.
| Type: | Article |
|---|---|
| Title: | Spectral X-ray phase contrast imaging with a CdTe photon-counting detector |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.nima.2020.164098 |
| Publisher version: | https://doi.org/10.1016/j.nima.2020.164098 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | X-ray imaging, Phase-contrast, Photon-counting detector, Timepix, Image quality |
| 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/10096833 |
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