Acquired image when the purpose system of the present invention is by measurement bone salts amount, to be suitble to the aspect of what bone diagnosis to show. In terms of image display processing, tie up to bone salts distribution image data, low energy X-ray caused by high transmission X ray image data caused by the low X-ray through X ray image data or high-energy, select the image data of display background image. Then, according to selected image data, background video is made to show what display. Region-of-interest is set on background video according to the operation of user in display background image Hou. Then, according to the operation of user, it is distributed image data, the low image data that region is paid close attention to through selection in X ray image data or high transmission X ray image data in bone salts, will replace region-of-interest becomes the resultant image of image caused by selected image data, shows what display.本發明之目的係將測定骨鹽量時所取得的影像，以適合於骨診斷的態樣顯示。在影像顯示處理方面，係在骨鹽分佈影像數據、低能量之X射線所致低透過X射線影像數據或高能量之X射線所致高透過X射線影像數據中，選擇顯示背景影像的影像數據。接著，根據所選擇的影像數據，使背景影像顯示於顯示器。在顯示背景影像後，根據使用者之操作，在背景影像上設定關注區域。接著，根據使用者之操作，在骨鹽分佈影像數據、低透過X射線影像數據或高透過X射線影像數據中選擇表示關注區域的影像數據，將替換關注區域成為所選擇的影像數據所致影像的合成影像，顯示於顯示器。
