Comparison of laboratory grating-based and speckle-tracking x-ray phase-contrast imaging

Romell, J., Zhou, T., Zdora, M., Sala, S., Koch, F. J., Hertz, H. M. and Burvall, A. (2017) Comparison of laboratory grating-based and speckle-tracking x-ray phase-contrast imaging. Journal of Physics: Conference Series, 849, [012035]. (doi:10.1088/1742-6596/849/1/012035).

Abstract

Phase-contrast imaging with x-rays is a developing field for imaging weakly absorbing materials. In this work, two phase-contrast imaging methods, grating- and speckle-based imaging, that measure the derivative of the phase shift, have been implemented with a laboratory source and compared experimentally. It was found that for the same dose conditions, the speckle-tracking differential phase-contrast images have considerably higher contrast-to-noise ratio than the grating-based images, but at the cost of lower resolution. Grating-based imaging performs better in terms of resolution, but would require longer exposure times, mainly due to absorption in the grating interferometer.

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