PROBLEM TO BE SOLVED: To carry out PCI in less operation time and with less dosing to a subject to be examined by reproducing the same projecting direction as the imaging direction in an angio-image on a CT image and accurately carrying out blood vessel condition estimation such as the estimation of stenosis ratio.SOLUTION: An IVR-CT apparatus 10 has an angio-image obtaining unit 101, an angio-image imaging direction obtaining unit 102, a CT-image obtaining unit 103, a blood vessel part extracting unit 104, a projected image generating means 105 and a display controlling means 107. The angio-image obtaining unit 101 obtains a required angio-image from multiple chronological angio-images. The angio-image imaging direction obtaining unit 102 obtains a direction of imaging as incidental information included in data on the required angio-image. The CT-image obtaining unit 103 obtains a three-dimensional CT-image corresponding to the required angio-image. The blood vessel part extracting unit 104 extracts a blood vessel part included in the three-dimensional CT-image. The projected image generating means 105 generates a three-dimensional projected image by projecting the blood vessel part, and a three-dimensional projected image corresponding to a direction of a projection after a manual operation operates the direction of the projection. The display controlling means 107 displays the three-dimensional projection image and the angio-image.COPYRIGHT: (C)2007,JPO&INPIT【課題】アンギオ画像における撮像方向と同じ投影方向をCT画像上で再現し、狭窄率評価等の血管性状評価を正確に精度よく行ない、より少ない操作時間で、かつ、より少ない被検体への被曝量でPCIを行なうこと。【解決手段】IVR-CT装置10は、時系列的に複数のアンギオ画像から所要のアンギオ画像を取得するアンギオ画像取得手段101と、所要のアンギオ画像のデータに含まれる付帯情報としての撮像方向を取得するアンギオ画像撮像方向取得手段102と、所要のアンギオ画像に対応する3次元のCT画像を取得するCT画像取得手段103と、3次元のCT画像に含まれる血管部分を抽出する血管部分抽出手段104と、血管部分を、撮像方向を投影方向として投影した3次元の投影像を生成すると共に、手動入力による変更後の投影方向に対応する3次元の投影像を生成する投影像生成手段105と、3次元の投影像とアンギオ画像とを表示させる表示制御手段107とを有する。【選択図】 図3
