LOW-ENERGY X-RAY IMAGE FORMING DEVICE AND METHOD FOR FORMING IMAGE THEREOF

摘要

An objective of the present invention is to optimize formation of an image of soft tissue having a low linear absorption coefficient with respect to x-ray mammography or detecting foreign matter with x-rays. A low-energy x-ray image forming device comprises an x-ray emitter (22) which emits x-rays having an energy spectrum which is contiguously distributed across an energy range of 18-30keV (or 18-37keV) which is higher than the effective energy of the 10-23keV energy region. The device further comprises: detectors (42A-42C, 83) which detect the x-rays which are emitted from the x-ray emitter and which have passed through either soft tissue to be photographed or a substance to be photographed having a tissue corresponding to the soft tissue from a contrast-to-noise ratio (CNR) viewpoint; and a console (4) which acquires an image of the soft tissue or the substance to be photographed on the basis of detection signals of the x-rays. The soft tissue or the substance are defined as being a tissue which presents a contrast-to-noise ratio (CNR) of 3.8 or greater when x-rays are projected under an x-ray tube voltage of 20kV.