X-ray phase-contrast imaging is an important diagnostic tool in medicine
biology and materials science. At the Beamline 4W1A and TOP station of the Beijing Synchrotron Radiation Facility ( BSRF ) in China
a series of samples were investigated using three monochromatic modes of optics and based on a mechanism of quadratic dif- ferential phase contrast . We have observed phase contrast images with edge enhancement for structure of large-area samples
such as fingerling and tissue of SD rat’s lungs etc.