Patent ID: 7522696

Claim:
An X-ray CT apparatus comprising: an X-ray data acquisition device for acquiring X-ray projection data transmitted through a subject lying between an X-ray generator and an X-ray detector having a two-dimensional detection plane by a helical scan which acquires X-ray projection data, while said X-ray generator and said X-ray detector are being rotated about a center of rotation lying therebetween with said X-ray generator and said X-ray detector moving relative to the subject lying therebetween; an image reconstructing device for image-reconstructing said acquired projection data; an image display device for displaying an image-reconstructed tomographic image; and an imaging condition setting device for setting various kinds of imaging conditions for a tomographic image, wherein said X-ray data acquisition device includes a first device for a high pitch helical scan using a helical pitch capable for scanning a whole heart of the subject within a time of one heart-beat in synchronization with a predetermined phase in one cycle of a cardiac signal of said subject.