Fourier transform image processing techniques for grid-based phase contrast imaging

Sajjad Tahir; Sajid Bashir; Jonathan C. Petruccelli; C. A. MacDonald

doi:10.1117/12.2062889

5 September 2014 Fourier transform image processing techniques for grid-based phase contrast imaging

Sajjad Tahir, Sajid Bashir, Jonathan C. Petruccelli, C. A. MacDonald

Proceedings Volume 9209, Advances in Computational Methods for X-Ray Optics III; 920913 (2014) https://doi.org/10.1117/12.2062889
Event: SPIE Optical Engineering + Applications, 2014, San Diego, California, United States

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.¹that 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.

Citation Download Citation

Sajjad Tahir, Sajid Bashir, Jonathan C. Petruccelli, and 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); https://doi.org/10.1117/12.2062889

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