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4 March 2020 Fourier transform phase retrieval for x-ray phase-contrast imaging based on cascaded Talbot–Lau interferometers
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Abstract

Long exposure time is one of the major limitations in x-ray phase-contrast imaging (XPCI). Therefore, we demonstrate a promising alternative method for grating-based XPCI coupled with cascaded Talbot–Lau interferometers (TLIs). A Fourier analysis of the moiré fringe patterns generated by the interferometers was used to obtain the multicontrast images (such as absorption, differential phase-contrast, and normalized visibility-contrast images) with a single exposure. The cascaded configuration with TLI and inverse TLI using large-period absorption gratings was established to verify the effectiveness of the algorithm and three multicontrast images of a polytetrafluoroethylene (PTFE) tube were obtained experimentally. The groove structures in the PTFE can be clearly identified in the differential phase-contrast image. This method shows potential for application of cascaded TLI in medical imaging.

© 2020 Society of Photo-Optical Instrumentation Engineers (SPIE) 0091-3286/2020/$28.00 © 2020 SPIE
Jianheng Huang, Faiz Wali, Yaohu Lei, Xin Liu, and Ji Li "Fourier transform phase retrieval for x-ray phase-contrast imaging based on cascaded Talbot–Lau interferometers," Optical Engineering 59(3), 033101 (4 March 2020). https://doi.org/10.1117/1.OE.59.3.033101
Received: 11 October 2019; Accepted: 12 February 2020; Published: 4 March 2020
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