Low-dose phase-contrast X-ray imaging: a comparison of two methods

T Zhou, U Lundström, D H Larsson, H M Hertz, A Burvall
2013 Journal of Physics, Conference Series  
Phase-contrast X-ray imaging is emerging as an alternative to the conventional Xray radiography for materials with low absorption coefficients. For small features, phase-contrast imaging reduces dose compared to absorption-contrast imaging. There are a variety of phase-contrast imaging techniques, among which the gratingbased and propagation-based methods are discussed in this thesis. The principle of the two phase-contrast imaging methods is explained in this thesis. The image construction
more » ... ge construction process of the grating-based method from detected images to the differential phase-contrast (DP) image, standard absorption image and darkfield image is introduced in detail. In order to make a theoretical comparison between the grating-based method and the propagation-based method, a model of the grating-based phase-contrast imaging method is built. Blood vessels with contrast agent CO2 within 2-cm-thick soft tissue are simulated as objects. The doses of two methods are compared when SNR 2 equals 25 with diameters of the blood vessels as independent variables. ii
doi:10.1088/1742-6596/463/1/012041 fatcat:mtxk3ms4uzawno5a2srrtvh4te