Each pixel which is detected by the radiation intensity information sensing station and the radiation intensity information sensing station which detect the radiation intensity information of each pixel inside the interest territory which is set by the interest territory setting section and the interest territory setting section which set the interest territory which consists of the joint which is recognized by the joint recognition section and the joint recognition section which recognize the joint of the bone from the detector and the phase contrast picture which detect the phase contrast picture of the radiation which was irradiated by the bone diseased appraisal system, from the aforementioned emission radiation source vis-a-vis the emission radiation source which irradiates radiation and the subject which includes the bone, transmitted the aforementioned boneThe index calculation section which calculates the index which displays the disease has on the basis of the largest radiation intensity information inside the interest territory which is obtained among radiation intensity information, by the largest radiation intensity information acquisition section and the largest radiation intensity information acquisition section which acquire largest radiation intensity information.骨疾患評価システムには、放射線を照射する放射線源と、骨を含む被写体に対して、前記放射線源から照射され、前記骨を透過した放射線の位相コントラスト画像を検出する検出器と、位相コントラスト画像から骨の関節部を認識する関節認識部と、関節認識部により認識された関節部からなる関心領域を設定する関心領域設定部と、関心領域設定部により設定された関心領域内の各画素の放射線強度情報を検出する放射線強度情報検出部と、放射線強度情報検出部により検出された各画素の放射線強度情報のうち、最大放射線強度情報を取得する最大放射線強度情報取得部と、最大放射線強度情報取得部により得られた関心領域内の最大放射線強度情報を基に、疾患の程度を表す指標を算出する指標算出部とが備えられている。
