Two-dimensional grating-based X-ray phase-contrast imaging using Fourier transform phase retrieval

We demonstrate a single shot two-dimensional grating-based Xray phase-contrast imaging using a synchrotron radiation source. A checkerboard designed phase grating for p phase modulation at 17 keV and 35 keV, and a lattice-shaped amplitude grating with a high aspect ratio to shield X-rays up to 35 keV were fabricated. A Fourier analysis of Moire fringe generated by the gratings was introduced to obtain the two-dimensional differential phase-contrast image with a single exposure. The results show that soft tissues and cartilages of a chicken wing sample are clearly seen with differential phase variation in two-dimensional directions. Using this method not only the whole of an object but also only an inner part of the object can be imaged. (C) 2011 Optical Society of America