PHASE GRADIENT UNWRAPPING IN DIFFERENTIAL PHASE CONTRAST IMAGING

摘要

The present invention relates to recovering image data in differential phase- contrast imaging. In order to provide improved phase gradient unwrapping in case of insufficient image data, a method for phase gradient unwrapping in differential phase contrast imaging based on a quality check is provided with the following the steps: a) providing X-ray phase contrast image data; b) estimating (132) wrapped phase gradients (134) for at least sample image points (116) of the image data; c) determining (136) likelihood (138) that phase wrapping occurred at the sample image points and selecting (140) image points of the sample image points with medium likelihood (142, 150); d) adapting the data of the selected image points by applying predetermined filtering (144); e) replacing (146) the acquired data of the selected image points with the adapted data providing adapted image data (148), which adapted image data also comprises the acquired data of the non- selected image points; and f) recovering the image data on the basis of the adapted image data by phase-un-wrapping (152).