RADIOGRAPHY DEVICE AND RADIOGRAPHY SYSTEM

摘要

The present invention generates a high-precision radiation phase contrast image by appropriate exposure control. An X-ray imaging system (10) comprises: a first grid (31); a second grating (32) having a period that substantially matches the pattern period of a radiation picture formed by radiation that passes through the first grating; a radiation image detector (30) for detecting the radiation picture masked by the second grating; a dose detector (35) for detecting the incident radiation dose, the dose detector being positioned upstream from the second grating; and a controller (22) for controlling exposure on the basis of the dose detected by the dose detector.