Patent ID: 7896547

Claim:
A radiation image capturing system comprising: an image capturing unit including a radiation source for emitting a radiation; a cassette including a radiation conversion panel for detecting the radiation which has been emitted from said radiation source and which has passed through a subject, and converting the detected radiation into radiation image information; a position detecting unit for detecting respective positions of said radiation source and said radiation conversion panel; and a determining unit for determining whether said radiation source and said radiation conversion panel are placed in head-on facing relation to each other based on the positions of said radiation source and said radiation conversion panel which are detected by said position detecting unit; wherein said radiation source and said radiation conversion panel are separate from each other and movable with respect to each other, wherein said position detecting unit comprises a detector for detecting the respective positions of said radiation source and said radiation conversion panel in a horizontal plane, and wherein the detector comprises a first horizontal sensor for detecting a horizontal position of the radiation detecting cassette, a first vertical sensor for detecting a vertical position of the radiation detecting cassette, a second horizontal sensor for detecting a horizontal position of the image capturing unit, and a second vertical sensor for detecting a vertical position of the image capturing unit.