Radiographic apparatus

摘要

According to a radiographic apparatus of this invention, parameters obtained on an assumption that an X-ray tube 2 is moved Wd×m, which is an integral multiple of pixel pitch Wd, in a B− direction opposite to B+ direction which is a direction of movement by Y-direction adjust screws of a moving mechanism, are corrected as parameters obtained when X-rays are emitted from the X-ray tube 2 in a state of a grid 6 having been moved Wd×m by the Y-direction adjust screws. This allows only the grid 6 to be moved without moving the X-ray tube 2. Therefore, parameters equivalent to the parameters which should be obtained when the X-ray tube 2 is moved are obtained by moving the grid 6, and position shifting can be reduced.

主权项

1. A radiographic apparatus for obtaining a radiological image, comprising:
a radiation emitting device for emitting radiation; a scattered radiation removing device for removing scattered radiation; and a radiation detecting device having a plurality of detecting elements arranged in rows and columns for detecting the radiation; wherein the scattered radiation removing device is constructed to have a direction of arrangement of absorbing layers, which absorb the scattered radiation, parallel to at least one of a direction of the rows and a direction of the columns of the detecting elements, and to have each of the absorbing layers arranged parallel to a detecting plane of the radiation detecting device; and wherein the radiographic apparatus further comprises: a moving device for moving only the scattered radiation removing device parallel to the direction of arrangement of the absorbing layers such that the positional relationship of the scattered radiation removing device with respect to each of the radiation emitting device and the radiation detecting device is altered; a physical quantity calculating device for calculating physical quantities relating to radiation intensity based on detection by the radiation detecting device of the radiation after transmission through the scattered radiation removing device; and a correcting device for calculating physical quantities obtained on an assumption that the radiation emitting device is moved a predetermined distance in a direction opposite to a direction of movement by the moving device, from the physical quantities calculated by the physical quantity calculating device when radiation is emitted from the radiation emitting device in a state of the scattered radiation removing device having been moved the predetermined distance by the moving device.