Patent ID: 7313219

Claim:
A radiation image pick-up device comprising: radiation generation means; radiation detection means in which a plurality of radiation detection elements for respectively converting a radiation from the radiation generation means into an electrical signal are arranged in a matrix to detect radiation; read means for reading the electrical signal from the radiation detection means one frame by one frame for a plurality of frames; storage means for storing data corresponding to the electrical signal read by the read means, as information groups of m frames such that one group corresponds to one frame; position control means for controlling a position of the radiation generation means and the radiation detection means, such that, when the radiation detecting means detects radiation for m frames and a first plane is set within an object to be detected disposed between the radiation generation means and the radiation detection means, the position control means moves the radiation generation means by a moving distance Lx(m) along a second plane spaced by distance D from the first plane, and moves the radiation detection means along a third plane spaced by distance d from the first plane, and such that an intersection point between a straight line between a point at which a first one of said radiation detection elements is located and a point at which the radiation generation means is located, and the first plane is substantially at a fixed point over the m frames; and signal processing means for processing to obtain a tomography image along a fourth plane spaced from the first plane by a distance h in a direction of a side of the radiation generation means, based on the information groups of m frames, wherein the signal processing means performs the processing based on data of the first one of said radiation detection elements in an information group of a first one of the m frames, and based on data of the radiation detection element nearest to a position displaced by Zx(m) from the first one of said radiation detection elements in the information group of m-th one of the m frames, to meet a relation: Z x ⁡ ( m ) = h × ( D + d ) D × ( D - h ) × L x ⁡ ( m ) .