In the present invention, when a user designates specific pixels in a test subject image using a cursor, correction assistance information for the designated pixels (target pixels) is displayed. The correction assistance information includes information such as the following: information indicating automatic identification results for the target pixels local bone density at the target pixels and average bone density for a region that includes the target pixels local attenuation at the target pixels and average attenuation within that region at time of low-energy radiation emission and local attenuation at the target pixels and average attenuation in that region at time of high-energy X-ray emission. In a case where soft-tissue pixels are designated, in the test subject image, a local soft-tissue evaluation value and an average soft-tissue evaluation value are displayed instead of the local bone density and the average bone density.本發明係關於受測者影像上,使用者藉由游標指定特定之畫素時,於被指定的畫素(注目畫素)顯示修正支援資訊。修正支援資訊係包含於注目畫素所顯示自動識別結果的資訊、於注目畫素之局部骨密度及包含注目畫素的區域之平均骨密度、低能量放射線照射時的注目畫素之局部衰減量及前述區域內之平均衰減量、高能量X射線照射時的注目畫素之局部衰減量及前述區域內之平均衰減量等。於受測者影像上,軟組織畫素被指定的情形,替代局部骨密度及平均骨密度,而顯示局部軟組織評價值及平均軟組織評價值。54‧‧‧顯示畫面56‧‧‧受測者影像58‧‧‧關心區域60‧‧‧游標62‧‧‧修正支援資訊64‧‧‧骨畫素的資訊66‧‧‧於注目畫素求得的局部骨密度及包含注目畫素的骨部區域所演算的平均骨密度68‧‧‧低能量X射線照射時的注目畫素的衰減量及包含注目畫素中的區域內的平均衰減量70‧‧‧高能量X射線照射時的注目畫素中的局部衰減量及包含注目畫素的區域內的平均衰減量L1-L4‧‧‧關心區域
