PROBLEM TO BE SOLVED: To provide a blood vessel analysis device capable of analyzing a stricture index with high accuracy on the basis of an image analysis and a structure-fluid analysis of a blood vessel (including blood).SOLUTION: An blood vessel analysis device includes a storage part 33 for storing data of a medical image over a plurality of time phases about a blood vessel of a subject with a contrast medium injected thereto, and an image processing part 27 for setting an analysis object area in a blood vessel area included in the medical image over the plurality of time phases, performing image processing of the medical image over the plurality of time phases to calculate a form index, a shape deformation index and a CT value change index over the plurality of time phases of the analysis object area, calculating the CT value change index resulting from a flow rate change in the contrast medium in a local blood vessel area around a narrowed site included in the analysis object area and a blood vessel cross-sectional shape deformation index in the local blood vessel area on the basis of the form index, the shape deformation index and the CT value change index over the plurality of time phases, and calculating a stricture index about the narrowed site on the basis of the CT value change index and the blood vessel cross-sectional deformation index in the local blood vessel area.COPYRIGHT: (C)2015,JPO&INPIT【課題】血管（血液を含む）の画像解析と構造流体解析に基づき、狭窄指標の解析を高精度に行うことができる血管解析装置を提供する。【解決手段】血管解析装置は、造影剤が注入された被検体の血管に関する複数の時位相に亘る医用画像のデータを記憶する記憶部３３と、複数の時位相に亘る医用画像に含まれる血管領域に解析対象領域を設定し、複数の時位相に亘る医用画像を画像処理して解析対象領域の複数の時相に亘る形態指標、形状変形指標、及びＣＴ値変化指標を算出し、複数の時位相に亘る形態指標、形状変形指標、及びＣＴ値変化指標に基づいて解析対象領域に含まれる狭窄部位の周辺の局所血管領域における造影剤の流量変化に起因するＣＴ値変化指標と局所血管領域における血管断面形状変形指標とを算出し、局所血管領域におけるＣＴ値変化指標と血管断面形状変形指標とに基づいて狭窄部位に関する狭窄指標を算出するする画像処理部２７とを具備する。【選択図】図４
