PROBLEM TO BE SOLVED: To provide a blood vessel state analyzer and the like that use an image analysis to realize a non-invasive analysis of a blood vessel state such as coronary artery, etc. and can facilitate evaluations of existence and severity of stenosis or myocardial ischemia.SOLUTION: This blood vessel state analyzer analyzes a blood vessel state of coronary artery on the basis of transparent image data for a coronary angiographic examination, and comprises a display device and a control unit. The control unit comprises: (a) a blood vessel state analysis part that, with respect to at least two coronary arteries, generates measured TAG (Transluminal Attenuation Gradient) curves showing correlations between multiple positions in a direction from a beginning part of each coronary artery to its distal part and contrast intensity at the respective positions； and (b) a display control part that uses the display device to display at least the two measured TAG curves, which are generated with respect to each coronary artery, in a manner coexistent in one graph.SELECTED DRAWING: Figure 1【課題】画像解析を利用して非侵襲で冠動脈等の血管状態を解析でき、また、狭窄や心筋虚血の有無や程度の評価を行い易い血管状態解析装置等を提供する。【解決手段】この血管状態解析装置は、冠動脈造影検査の透視画像のデータに基づいて冠動脈の血管状態解析を行うための装置であって、表示デバイスと、制御ユニットとを備え、前記制御ユニットは、（ａ）少なくとも２本の冠動脈につき、各冠動脈の起始部から遠位部へと向かう方向に沿う複数の位置と、それぞれの位置における造影強度との相関を示す実測ＴＡＧ（Ｔｒａｎｓｌｕｍｉｎａｌ Ａｔｔｅｎｕａｔｉｏｎ Ｇｒａｄｉｅｎｔ）カーブを作成する血管状態解析部と、（ｂ）冠動脈ごとに作成した少なくとも２つの前記実測ＴＡＧカーブを、１つのグラフ中に併存させて前記表示デバイスに表示させる表示制御部とを備える。【選択図】図１
