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Lecture: A General Theory of X-ray Grating Interferometer with Arbitrary Grating Combinations

Tuesday, April 30, 2019 - 10:10am - 11:00am
Lind 305
Guang-Hong Chen (University of Wisconsin Medical School)
In the past decades, several x-ray grating interferometers that employ one, two or three gratings have been proposed and experimentally implemented to accomplish x-ray phase contrast imaging and dark-field imaging with different performance characteristics. The choice of different interferometer results in different requirements on x-ray source and detector and also
yields different imaging performance in terms of signal to noise ratio (SNR). Since different imaging tasks have different requirements on SNR and the availability of x-ray source and detector may also be limited in practice, it is critically important to make appropriate choices of the needed x-ray interferometer for a given imaging task. Although there are many theoretical
and experimental studies on the noise characteristic of the grating interferometer based imaging systems, a comprehensive understanding of the performance of a general combination of multiple x-ray gratings with different physical characteristics is still missing. In this lecture, we will present a unified framework to quantitatively analyze the achievable visibility and sensitivity for different grating interferometers. The results from this unified analysis can be used to guide the choice of the grating interferometer for a specific imaging task or be used to assess the potential technical advantages and limitations for a given grating interferometer.