PROBLEM TO BE SOLVED: To detect an abnormality of pulmonary ventilation function or heart function by using concentration change and morphological change of a site included in a dynamic image. According to a diagnostic console (3), a control unit (31) determines a feature amount related to a change in density of one part in the chest between a plurality of frame images of a dynamic image of the chest transmitted by an imaging console (2). The calculated feature quantity related to the morphological change of one site or other site in the chest between the plurality of frame images used for the calculation of the feature quantity related to the density change, and the calculated feature quantity related to the density change A feature amount related to lung ventilation function or heart function is calculated based on a ratio of feature amounts related to morphological change. [Selection diagram] Fig. 16【課題】動態画像に含まれる部位の濃度変化と形態変化を用いて肺換気機能や心機能の異常を検出できるようにする。【解決手段】診断用コンソール３によれば、制御部３１は、撮影用コンソール２により送信された胸部の動態画像の複数のフレーム画像間における胸部内の一の部位の濃度変化に係る特徴量を算出し、濃度変化に係る特徴量の算出に用いた複数のフレーム画像間における胸部内の一の部位又は他の部位の形態変化に係る特徴量を算出し、算出した濃度変化に係る特徴量と形態変化に係る特徴量の比に基づいて、肺換気機能又は心機能に係る特徴量を算出する。【選択図】図１６
