Patent ID: 7187756

Claim:
An X-ray CT apparatus comprising: an X-ray tube which generates X-rays from multiple focal points of different 3-dimensional positions sequentially on a time-division basis, wherein said X-ray tube comprises an anode and a cathode which confront each other and generate X-rays from focal points on said anode where electrons from said cathode impinge, wherein said anode has multiple impingement portions where electrons released by said cathode impinge at multiple positions on a trajectory of electrons sequentially on a time-division basis, wherein said anode comprises a plurality of rotary plates which are parallel to each other and share a rotation shaft which is parallel to the trajectory of electrons, wherein said rotary plates are located from a position nearest to said cathode up to a position immediately before a position farthest from said cathode, each of said rotary plates having large-radius sections with a radius larger than a distance from a rotation center to the trajectory of electrons and small-radius sections with a radius smaller than the distance from the rotation center to the trajectory of electrons by being formed alternately along a rotational direction such that the large-radius sections of said rotary plates do not overlap in a direction parallel to the trajectory of electrons; a plurality of filters which implement filtering individually for the X-rays generated individually from the focal points; a collimator which equalizes an irradiation range of the X-rays generated individually from the focal points; a collection device which collects projection data of multiple views of a subject of imaging for the X-rays generated individually from the focal points; and a reconstruction device which reconstructs an image based on the projection data.