Patent ID: 7983390

Claim:
An energy subtraction processing apparatus, comprising constituent image forming means for: receiving input of a plurality of radiation images having been formed with radiation carrying image information of an object, each of the radiation images representing degrees of transit attenuation of one of a plurality of patterns of radiation having different energy distributions, which transit attenuation occurs in the object, performing a weighted addition or subtraction process on corresponding pixels in the plurality of the radiation images by use of given weight factors, and thereby forming a constituent image representing a predetermined constituent in the object, wherein the apparatus further comprises: grid information acquiring means for acquiring grid information representing grid use conditions at the time of the imaging operations for the plurality of the radiation images, and weight factor adjusting means for adjusting the weight factors in accordance with the grid information, which has been acquired by the grid information acquiring means, the constituent image forming means performing the weighted addition or subtraction process by use of the weight factors, which have been adjusted by the weight factor adjusting means.