5 September 2014 Fourier transform image processing techniques for grid-based phase contrast imaging
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Abstract
A recently developed technique for phase imaging using table top sources is to use multiple fine-pitch gratings. However, the strict manufacturing tolerences and precise alignment required have limited the widespread adoption of grating-based techniques. In this work, we employ a technique recently demonstrated by Bennett et al.1 that ultilizes a single grid of much coarser pitch. Phase is extracted using Fourier processing on a single raw image taken using a focused mammography grid. The effects on the final image of varying grid, object, and detector distances, window widths, and of a variety of windowing functions, used to separate the harmonics, were investigated.
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Sajjad Tahir, Sajjad Tahir, Sajid Bashir, Sajid Bashir, Jonathan C. Petruccelli, Jonathan C. Petruccelli, C. A. MacDonald, C. A. MacDonald, } "Fourier transform image processing techniques for grid-based phase contrast imaging", Proc. SPIE 9209, Advances in Computational Methods for X-Ray Optics III, 920913 (5 September 2014); doi: 10.1117/12.2062889; https://doi.org/10.1117/12.2062889
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