| 摘要 |
PROBLEM TO BE SOLVED: To enable a range of pixel values of image data between slices to be included within an identical range, by calculating the standard deviation of image data at a scan condition from the standard deviation of image data and the reduction ratio of the pixel value to determine the scan condition. SOLUTION: An X-ray source 2 is controlled by a control means 15 to input detection signals of an X-ray detector 3, angle positions of the X-ray source is determined at two mutually different angle positions before CT imaging of a subject to execute scout imaging of the subject, and each scout image is generated. The standard deviationσof image data by projection display data areas and the reduction ratio of pixel values on a scout image obtained at two angle positions are calculated, and therefrom the standard deviationσ' of image data by the scan condition set as the default. Next, the scan condition to obtain desired standard deviation is determined by the standard deviationσand a desired standard deviation.
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