Patent ID: 7336759

Claim:
A scattering compensating method comprising the steps of: acquiring a projective length pro_ex of non-subject entities that are entities other than a subject, the non-subject entities causing scattering of X-rays which cannot be ignored while existing in the passage of X-rays during radiography of the subject; acquiring a projective length pro_pt of an object of radiography; measuring data I(do,do) by performing radiography with the non-subject entities and the object of radiography inserted in the passage of X-rays and with a beam thickness set to the same value as a detector thickness do; measuring data I(do,d) by radiographing the object of radiography with the beam thickness set to a value d larger than the detector thickness do; calculating an amount of scattering S(do,d) on the basis of the difference between the data I(do,do) and the data I(do,d); storing information needed to calculate the amount of scattering S(do,d) using the projective length pro_ex of the non-subject entities and the projective length pro_pt of the object of radiography; using data produced by radiographing the subject to calculate the projective length pro_pt of the subject and the projective length pro_ex of the non-subject entities having affected the data; reading the information associated with the projective length pro_pt of the subject and the projective length pro_ex of the non-subject entities; and using the information to correct the data so as to compensate for scattering.