X-ray ct device

The present invention aims to optimize image quality for a conventional scan (axial scan) or a cine scan or a helical scan of an X-ray CT apparatus by a data acquisition system having a limited number of channels. The optimum view numbers determined or defined by image quality to be determined depending upon the positions of the respective channels at image reconstruction are determined by a sampling theorem. Thus, the optimum view numbers, which depend upon the respective channel positions, are allocated. The data acquisition system performs data acquisition in accordance with the views to make it possible to obtain a tomographic image having the optimum image quality. Thus, the number of A/D converters of the data acquisition system and its performance can also be optimized.