19 March 2014 Effect of object size, position, and detector pixel size on X-ray absorption, differential phase-contrast and dark-field signal
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Abstract
X-ray phase-contrast and dark-field imaging are two new modalities that have great potential for applications in different fields like medical diagnostics or materials science. The use of grating interferometers allows the detection of both differential phase shift and dark-field signal together with the absorption signal in a single acquisition. We present wave-optical simulations to quantitatively analyze the response of a grating-based X-ray phase-contrast and dark-field imaging setup to variations of the sample relative to the system. Specifically, we investigated changes in the size and the position of the object. Furthermore, we examined the influence of different detector pixel sizes while sample and interferometer remained unchanged. The results of this study contribute to a better understanding of the signal formation and represent a step towards the full characterization of the response of grating interferometry setups to specific sample geometries.
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Johannes Wolf, Michael Chabior, Jonathan Sperl, Andreas Malecki, Dirk Bequé, Cristina Cozzini, Franz Pfeiffer, "Effect of object size, position, and detector pixel size on X-ray absorption, differential phase-contrast and dark-field signal", Proc. SPIE 9033, Medical Imaging 2014: Physics of Medical Imaging, 903358 (19 March 2014); doi: 10.1117/12.2043594; https://doi.org/10.1117/12.2043594
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