Journal
APPLIED OPTICS
Volume 52, Issue 28, Pages 6940-6947Publisher
OPTICAL SOC AMER
DOI: 10.1364/AO.52.006940
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Funding
- EPSRC [EP/G004250/1, EP/I021884/1]
- Prof. Giulio Brautti Ph.D Memorial Fellowship
- Australian Research Council [DE120101331]
- EPSRC [EP/I021884/1, EP/G004250/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/G004250/1, EP/I021884/1] Funding Source: researchfish
- Australian Research Council [DE120101331] Funding Source: Australian Research Council
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We derive a Fourier formulation of coded-aperture x-ray phase-contrast imaging, based on the wave theory of optics in the Fresnel approximation. We use this model to develop a flexible, efficient, and general simulation algorithm that can be easily adapted to other implementations of x-ray phase contrast imaging. Likewise, the algorithm enables a simple extension to 2D aperture designs, different acquisition schemes, etc. Problems related to numerical implementation of the algorithm are analyzed in detail, and simple rules are derived that enable us to avoid or at least mitigate them. Finally, comparisons with experimental data and data obtained with a different simulation algorithm are presented to validate the model and demonstrate its advantages in practical implementations. This also enabled us to demonstrate an increase in computational speed of more than one order of magnitude over a previous algorithm. (C) 2013 Optical Society of America
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