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目的:研究使用320排容积CT评价冠状动脉钙化斑块造成管腔狭窄的精确程度。方法:搜集320排冠状动脉CTA的受检者200例,均有中度以上狭窄程度的钙化斑块,并近期进行过冠状动脉造影检查(CAG),根据钙化斑块的平均CT值及斑块面积占管腔百分比程度进行分组,A组平均CT值120Hu-400Hu、B组400-500Hu、C组500Hu以上,三组内又根据钙化斑块占管腔的面积百分比分为1、2两个亚组。使用测量软件对钙化部位狭窄程度进行测量并与冠状动脉造影进行对比。结果:A、B、C三组中第1亚组高估程度分别为21.4±8.7%、23.1±7.7%、23.9±9.8%,第2亚组高估程度分别为30.1±13.4%、32.5±15.4%、33.5±16.4%。每组的三个亚组中,随着钙化斑块平均CT值的增高,高估程度略有增高,而同组中两个亚组间的比较,高估程度明显增高。结论:320排冠状动脉CTA钙化平均CT值对管腔的遮盖程度有影响,促使CTA高估了管腔的狭窄程度,两者呈正比相关。但影响程度不如钙化占管腔面积百分比明显。
OBJECTIVE: To study the accuracy of stenosis of coronary arteries using 320-row volumetric CT. Methods: Totally 320 subjects with coronary artery CTA were collected from 200 patients with calcified plaques with moderate to severe degree of stenosis and recent coronary angiography (CAG). According to the average CT value of plaque calcification and plaque The area accounted for the percentage of the lumen were grouped, the average CT value of group A 120Hu-400Hu, group B 400-500Hu, group C more than 500uu, three groups and according to calcified plaque accounted for the lumen area percentage is divided into two 1,2 Subgroup. Measurement software was used to measure the stenosis of calcifications and to compare with coronary angiography. Results: The overestimation rates of the first subgroup in groups A, B and C were 21.4 ± 8.7%, 23.1 ± 7.7% and 23.9 ± 9.8% respectively, and those in the second subgroup were 30.1 ± 13.4% and 32.5 ± 15.4%, 33.5 ± 16.4%. In the three subgroups of each group, the degree of overestimation slightly increased with the increase of average CT value of calcified plaque, but the overestimation of the two subgroups in the same group was significantly higher. CONCLUSION: The average CT value of coronary artery CTA calcification in 320 rows has an influence on the degree of lumen coverage, which leads to CTA overestimating the degree of lumen stenosis. However, the degree of influence is not as significant as the percentage of calcified lumen area.