| 摘要 |
Radiation images are recorded with several kinds of radiation having different energy distributions and having passed through an object and a bone calcium reference material composed of sections simulating amounts of bone calcium varying step-wise, the object being constituted of bones and soft tissues. A bone image, in which only the patterns of the bones are formed or emphasized, is formed from the radiation images. A difference between a mean value of image signal components, which represent part of the pattern of each section of the bone calcium reference material in the bone image, and a mean value of background signal components, which represent areas in the vicinity of the pattern of each section of the bone calcium reference material, is calculated. A difference between a mean value of image signal components, which represent a pattern of a specific part of the bones in the bone image, and a mean value of background signal components, which represent areas in the vicinity of the pattern of the specific part of the bones, is calculated. The difference value calculated for the specific part of the bones is compared with the difference values calculated for the sections of the bone calcium reference material.
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