Large-Area Phase-Contrast X-ray Imaging System Using a Two-Crystal X-ray Interferometer—Development of an Interference-Pattern-Based Feedback Positioning System

摘要

To more accurately suppress the phase fluctuation of the interference beams of a large-area phase-contrast X-ray imaging system using a two-crystal X-ray interferometer, a new feedback positioning system (FPS) has been developed and applied. The motion of interference patterns replaces the intensity of the interference beam in a small region as the feedback signal used in controlling the rotation of crystal blocks relative to each other. This FPS kept the phase fluctuation of the interference beams within pi/15 over more than six hours. Examples of high-quality two and three-dimensional images of biological samples obtained by the imaging system with the new FPS are given.