Energy subtraction processing method for radiation images, stimulable phosphor sheet, stimulable phosphor sheet composite member and stimulable phosphor sheet-filter composite member used for the method.

摘要

As an X-ray detecting means in an energy subtraction processing method, there is used a composite member comprising a plurality of stimulable phosphor sheets (A, B) exhibiting different levels of characteristics of absorbing the low energy component of a radiation and overlaid one upon another, or a composite member comprising a plurality of stimulable phosphor sheets and at least one filter made of a material absorbing the low energy component of a radiation which are overlaid one upon another, or a stimulable phosphor sheet comprising a substrate made of a material absorbing the low energy component of a radiation and stimulable phosphor layers provided thereon. The composite member or the stimulable phosphor sheet is exposed to a radiation passing through an object (7) including a specific structure to record therein at least two radiation images between which the image information at the portion of the specific structure is different. On the basis of the radiation images read out from the composite member or the stimulable phosphor sheet, a subtraction image is obtained.