Being the method of deciding the irregularity function which modulates the strength of the x-ray which is given by the x-ray source of the CT system which slice of the territory of the body of the person CT image pickup is done, method 1st substantially front of the slice making use of stage and the attenuation data which decide 1st largest x-ray attenuation from stage and the attenuation data which acquire the x-ray attenuation data for the view of the - rear or side crosses in 1st view on the basis of the stage which decides the length of projection of the slice which parallels to the axis with respect to the slice plane surface which you abbreviate crosses vis-a-vis view angle and the length which is decidedIt includes with the stage which decides the 2nd largest x-ray attenuation for the view of 2 and the stage which uses 1st and 2nd attenuation maximum in order to decide irregularity function.
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