改良单次短时屏气法用于血管减影冠状动脉CT成像  

Modified single short-time breath-holding method applicated in subtraction coronary CT angiography

作　　者：孟雪 邢俊 许楠[1] 席芊[1] MENG Xue;XING Jun;XU Nan;XI Qian(Department of Medical Imaging,Shanghai East Hospital Affiliated Tongji University,Shanghai 200120,China)

机构地区：[1]同济大学附属东方医院医学影像科,上海200120

出　　处：《中国医学影像技术》2021年第9期1321-1326,共6页Chinese Journal of Medical Imaging Technology

摘　　要：目的观察改良单次短时屏气法用于血管减影冠状动脉CT成像(S-CCTA)的价值。方法收集21例冠状动脉钙化复查(n=18)或冠状动脉支架植入术后(n=3)患者,采用改良单次短时屏气法行S-CCTA扫描,获得两次扫描图像和减影后图像后进行处理,采用4分制评价冠状动脉CT血管成像(CCTA)及S-CCTA图像质量,观察以严重钙化节段评估管腔狭窄程度的能力,并计算有效辐射剂量(ED)。结果21例患者屏气时间为(10.34±1.07)s,辐射ED为(3.43±1.04)mSv。18例冠状动脉钙化复查患者共90个钙化斑块,S-CCTA图像质量[(3.47±0.69)分]明显高于CCTA[(2.48±0.70)分,P<0.001),且S-CCTA图像所示可用于评估管腔狭窄程度的严重钙化冠状动脉节段(88.89%)明显多于CCTA图像(66.67%,P<0.001);3例冠状动脉支架植入术后患者共植入5枚支架,其S-CCTA图像质量[(2.75±0.29)分]明显高于CCTA[(1.84±0.23)分,P<0.05]。结论改良单次短时屏气S-CCTA可有效缩短屏气时间、减少辐射剂量并提高冠状动脉图像质量。Objective To observe the application value of modified single short-time breath-holding method in subtraction coronary CT angiography(S-CCTA).Methods Twenty-one patients who received re-examination of coronary calcifications(n=18)or after coronary stent implantation(n=3)were collected and underwent modified single short-time breath-holding S-CCTA.The images obtained from 2 times of scanning and subtraction were processed.The image qualities of coronary CT angiography(CCTA)and S-CCTA were evaluated using a 4-point scale,and the effective dose(ED)was calculated.Results The breath-holding time was(10.34±1.07)s,and the radiation ED was(3.43±1.04)mSv.The image qualities of S-CCTA of 90 calcified plaques in 18 patients with coronary calcifications([3.47±0.69]points)were significantly higher than those of CCTA([2.48±0.70]points,P<0.001),and S-CCTA images showed that the severe calcified coronary segments(88.89%)which could be used to evaluate the degree of lumen stenosis were significantly more than those of CCTA(66.67%,P<0.001),while the image qualities of S-CCTA([2.75±0.29]points)of 5 stents in 3 patients were significantly higher than those of CCTA([1.84±0.23]points,P<0.05).Conclusion The modified single short-time breath-holding S-CCTA could effectively shorten the breath-holding time,reduce radiation ED and improve image quality of CCTA.

关 键 词：冠状动脉疾病 支架 冠状动脉血管造影术 减影技术 

分 类 号：R541.4[医药卫生—心血管疾病] R814.42[医药卫生—内科学]