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

X-Ray Microscopy Conference 2016

Romell, J.^1 ; Zhou, T.^1 ; Zdora, M.^2,3 ; Sala, S.^2,3 ; Koch, F.J.^4 ; Hertz, H.M.^1 ; Burvall, A.^1

Biomedical and X-ray Physics, KTH Royal Intsitute of Technology, AlbaNova University Center, Stockholm

SE-106 91, Sweden^1

Diamond Light Source, Harwell Science and Innovation Campus, Oxfordshire, Didcot

OX11 0DE, United Kingdom^2

Department of Physics and Astronomy, University College London, London

WC1E 6BT, United Kingdom^3

Institute of Microstructure Technology, Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen

76344, Germany^4

关键词: Contrast to noise ratio;    Differential phase contrast;    Grating interferometers;    Grating-based imaging;    Laboratory source;    Phase-contrast imaging;    Weakly absorbing materials;    X-ray phase-contrast imaging;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/849/1/012035/pdf
DOI  :  10.1088/1742-6596/849/1/012035

来源: IOP

【 摘 要 】

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.