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其狭窄改善程度过去主要依目测法评价,结果与尸检测量冠脉狭窄程度误差较大。作者用密度计量法(de-nsitometry,D 法)和边缘测量法(edgedetection,E 法)行定量评价并与目测法进行比较。对象与方法:患者为1985～1986住院行 PTCA 术经 E 法和 D 法测量,冠脉造影清晰的29例34处病变。男28例、女1例,年龄46～70岁,右冠状动脉9例、左冠状动脉前降支22例、回旋支3例。目测法依 AHA 标准从最狭窄处摄影判断内径狭窄度。PTCA前、后均行目测法及 D、E 法测量。①D 法:对冠脉造影像在其狭窄部设轴测定辉度水平(GS),并测对照组辉度水平(GC),两者校正后,从两者比率算出面积狭窄度[面积狭窄%=(1-GS/GC)×100];②E 法:对冠脉血管造影像设血管中心线,根据两侧辉度水平勾划轮廓获得1次及2次微分波形,确定血管边缘。D 法仅能算出面积狭窄,若血管横截面积为圆形时还可推算内径狭窄度.E 法不仅能算出内径狭窄度,同样可换算面积狭窄度。结果:34处病变 PTCA 前狭窄度:目测为85.3±9.5%,D 法面积狭窄度89.2±4.9%,E 法换算面积狭窄度84.1±4.7%,三者无差异。D 法换算内径狭窄度
The degree of improvement of stenosis in the past mainly according to visual evaluation, the results and autopsy measured coronary stenosis greater error. The authors used quantitative densitometry (D-method) and edgedetection (E-method) for quantitative evaluation and comparison with visual methods. Subjects and Methods: The patients were hospitalized in 1985 ~ 1986 PTCA by E method and D method, coronary angiography clearly 29 cases of 34 lesions. 28 males and 1 females, aged 46 to 70 years old, right coronary artery in 9 cases, left anterior descending coronary artery in 22 cases, 3 cases of supination. Visual method according to the AHA standard from the narrowest point of photography to determine the diameter stenosis. PTCA before and after the line of sight method and D, E method of measurement. ①D method: The coronary artery angiography was used to measure the brightness level (GS) in the stenosis and the brightness level (GC) of the control group. After the two were corrected, the area stenosis [area stenosis% = (1-GS / GC) × 100]; ②E method: set the center line of blood vessels for coronary angiography, according to the outline of the two sides brightness profile to obtain the first and second differential waveform, to determine the edge of the blood vessels. D method can only calculate the area is narrow, if the cross-sectional area of the circle can also be calculated when the diameter stenosis.E method can not only calculate the diameter stenosis, the same can be converted to a narrow area. Results: The pre-PTCA stenosis of 34 lesions was 85.3 ± 9.5%, 89.2 ± 4.9% in D method, and 84.1 ± 4.7% in E method. There was no difference among the three methods. D method conversion diameter narrowness