PROBLEM TO BE SOLVED: To improve the legibility of information on the movement of the diagnostic object in a dynamic image.SOLUTION: In a diagnostic console 3, a control unit 31 acquires the frequency characteristic by performing Fourier transformation of the density change in the time direction of a dynamic image obtained by imaging respiration or pulsation of at least one cycle or more, and acquires the peak frequencies in a frequency range according to the type of the diagnostic object, then, determines the representative frequency containing the maximum peak frequency having the highest intensity out of the peak frequencies in the frequency range according to the type of the diagnostic object, and performs filter processing in the time direction to the dynamic image by using the cut-off frequency of emphasizing (extracting) the determined representative frequency.SELECTED DRAWING: Figure 3【課題】動態画像において診断対象の動態の情報の可読性を向上させる。【解決手段】診断用コンソール３によれば、制御部３１は、少なくとも一周期以上の呼吸又は拍動を撮影することにより得られた動態画像の時間方向の濃度変化をフーリエ変換してその周波数特性を取得し、診断対象の種類に応じた周波数範囲におけるピーク周波数を取得する。そして、診断対象の種類に応じた周波数範囲におけるピーク周波数のうち最も強度が高い最大ピーク周波数を含む代表周波数を決定し、決定した代表周波数を強調する（抽出する）カットオフ周波数を用いて、動態画像に時間方向のフィルター処理を施す。【選択図】図３
