Patent ID: 7496221

Claim:
An X-ray CT system, comprising: a radiation generating unit which generates a radiation; a radiation detecting unit which detects the radiation from the radiation generating unit; a clipping-correction unit which applies a clipping process to a radiation detected value by the radiation detecting unit and applies a mean value correction process to data acquired based upon the radiation detected value so that the separation of the local mean of the data acquired based upon the radiation detected value before and after the clipping process is reduced, the radiation detected value being data before image reconstruction for generating an X-ray CT image; an image reconfiguration unit which generates an image using data acquired based upon the radiation detected value after the clipping process and after the mean value correction process; a reclipping unit which applies a further clipping process to a radiation detected value after applying the mean value maintenance correction process; and a logarithmic transformation unit which generates projection data by applying a process including a logarithmic transformation process to the radiation detected value after the reclipping process.