Endrizzi, M;
Astolfo, A;
Price, B;
Haig, I;
Olivo, A;
(2016)
Large field-of-view asymmetric masks for high-energy x-ray phase imaging with standard x-ray tube.
In: Khounsary, AM and van Dorssen, GE, (eds.)
(Proceedings) SPIE 9964, Advances in Laboratory-based X-Ray Sources, Optics, and Applications V.
(pp. 99640A-99640A).
International Society for Optical Engineering: USA.
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Abstract
We report on a new approach to large field-of-view laboratory-based X-ray phase-contrast imaging. The method is based upon the asymmetric mask design that enables the retrieval of the absorption, refraction and ultra-small- angle scattering properties of the sample without the need to move any component of the imaging system. The sample is scanned through the imaging system, which also removes possible aliasing problems that might arise from partial sample illumination when using the edge illumination technique. This concept can be extended to any desired number of apertures providing, at the same time, intensity projections at complementary illumination conditions. Experimental data simultaneously acquired at seven different illumination fractions are presented along with the results obtained from a numerical model that incorporates the actual detector performance. The ultimate shape of the illumination function is shown to be significantly dependent on these detector-specific characteristics. Based on this concept, a large field-of-view system was designed, which is also capable to cope with relatively high (100 kVp) X-ray energies. The imaging system obtained in this way, where the asymmetric mask design enables the data to be collected without moving any element of the instrumentation, adapts particularly well to those situations in medical, industrial and security imaging where the sample has to be scanned through the system
| Type: | Proceedings paper |
|---|---|
| Title: | Large field-of-view asymmetric masks for high-energy x-ray phase imaging with standard x-ray tube |
| Event: | SPIE 9964, Advances in Laboratory-based X-Ray Sources, Optics, and Applications V |
| Location: | San Diego, California |
| Dates: | 28 August 2016 - 01 September 2016 |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1117/12.2240491 |
| Publisher version: | http://dx.doi.org/10.1117/12.2240491 |
| Language: | English |
| Additional information: | M. Endrizzi ; A. Astolfo ; B. Price ; I. Haig and A. Olivo " Large field-of-view asymmetric masks for high-energy x-ray phase imaging with standard x-ray tube ", Proc. SPIE 9964, Advances in Laboratory-based X-Ray Sources, Optics, and Applications V, 99640A (September 16, 2016); doi:10.1117/12.2240491; http://dx.doi.org/10.1117/12.2240491 Copyright 2016 Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited. |
| Keywords: | x-ray imaging, phase-contrast imaging, edge-illumination |
| 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/1520841 |
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