PROBLEM TO BE SOLVED: To accurately extract a target site from a non-contrast tomographic image and to three-dimensionally display the same.SOLUTION: In a three-dimensional image generation part 20, a three-dimensional image is generated by laminating a plurality of non-contrast tomographic images in which a body including the target site is imaged without using a contrast medium. In a processing area setting part 22, a processing area is set on the basis of a bone area projection image in which a bone area is extracted from the three-dimensional image and MIP is applied to the bone area by prescribed number of pieces. In a pixel value correction part 24, the range WIDE of pixel values indicating the target site is set on the basis of foresight information from a histogram of the pixel values inside the processing area, the pixel values within the WIDE are shifted to a high luminance side and corrected by applying a transmission function for enlarging the range of the pixel values after correction. Labeling is performed for each area in which pixels having the corrected pixel values indicating the target site are connected in a labeling processing part 26, the area to which the label to be the maximum pixel number is imparted is extracted as an area indicating the target site, and the extracted area is three-dimensionally displayed in a display control part 28.COPYRIGHT: (C)2013,JPO&INPIT【課題】非造影断層画像から精度良く対象部位を抽出して、3次元表示する。【解決手段】3次元画像生成部20で、造影剤を用いずに対象部位を含む身体を撮影した複数の非造影断層画像を積層して3次元画像を生成する。処理領域設定部22で、3次元画像から骨領域を抽出し、所定枚数毎の骨領域にMIPを適用した骨領域投影画像に基づいて、処理領域を設定する。画素値補正部24で、処理領域内の画素値のヒストグラムから、先見情報に基づいて対象部位を示す画素値の範囲WIDEを設定し、WIDE内の画素値を、高輝度側へシフトさせると共に、補正後の画素値の範囲が拡大するような透過関数を適用して補正する。ラベリング処理部26で、対象部位を示す補正後の画素値を有する画素を連結した領域毎にラベリングし、画素数最大となるラベルが付与された領域を、対象部位を示す領域として抽出し、表示制御部28で、抽出した領域を3次元表示する。【選択図】図1
