冠状动脉追踪冻结技术对冠状动脉多层螺旋CT血管成像质量的优化研究  

Research on image quality optimization of coronary computed tomography angiography with Snapshot freeze technique

作　　者：韩威[1] 胡刚[1] 路军良[1] 郭宁 陈华[1] 刘更槐[1] 周燕[1] 冯萌[1] 王莉[1] 李红敏[1] 吴新淮[1] HAN Wei;HU Gang;LU Jun-liang;GUO Ning;CHEN Hua;LIU Geng-huai;ZHOU Yan;FENG Meng;WANG Li;LI Hong-min;WU Xin-huai(General hospital of Beijing military command radiology department, Beijing, 100700, China)

机构地区：[1]北京军区总医院放射诊断科,北京100700 [2]GE中国CT影像研究中心,北京100176

出　　处：《中国循证心血管医学杂志》2016年第4期451-453,共3页Chinese Journal of Evidence-Based Cardiovascular Medicine

摘　　要：目的 探讨冠状动脉追踪冻结技术（snapshot freeze，SSF）对冠状动脉多层螺旋CT血管成像图像质量的优化价值。方法 回顾性分析北京军区总医院2013年3月~5月期间85例未服用控制心率药物的冠状动脉CTA检查患者影像学资料，应用SSF技术前后CT图像质量差异情况比较。患者按心率是否大于65次/min分为AB两组，其中A组26例，心率≤65 次/min； B组59例，心率＞65 次/min。应用冠状动脉追踪冻结技术对冠状动脉图像进行处理，测量应用SSF技术前后，左冠状动脉前降支、左回旋支及右冠状动脉的血管轴截面、运动伪影及邻近脂肪的SD值，计算运动伪影指数（MAI）数值；并采用盲法由两名高年资主治医师对图像质量进行五分制评分，对评分结果进行比较及量化分析。结果 A组患者平均心率（58.5±5.69）次/min；MAI：使用SSF技术为（12.65±5.96），低于未使用SSF技术（None-SSF）（24.10±8.62），差异有统计学意义（P＜0.05）；主观图像评分：使用SSF技术为SSF（4.15±0.45），高于None-SSF（3.00±1.04）, 差异有统计学意义（P＜0.05）。B组患者平均心率（77.73±9.67）次/min；MAI：使用SSF技术为（18.09±9.00），低于None-SSF（66.99±17.49），差异有显著统计学意义（P＜0.01）；主观图像评分使用SSF技术为（3.82±0.78），高于None-SSF（1.96±0.67），差异有显著统计学意义（P＜0.01）。A组患者应用SSF处理后MAI平均下降48%，B组患者应用SSF处理后MAI平均下降73%，下降幅度明显大于A组。结论 冠状动脉追踪冻结技术（SSF）可以提高冠状动脉CTA的图像质量，作用在患者心率超过65次/min时更为明显。Objective To explore the value of Snapshot Freeze (SSF) technique in image quality optimizationof coronary computed tomography angiography (CCTA). Methods Retrospective analysis was conducted on CCTAresults of 85 patients (without taking medications to control heart rate) from general hospital of Beijing militarybetween March and May 2013, in order to investigate differences of image quality before and after application ofSSF technique. Patients were divided into two groups: group A (26 patients with heart rate≤65 bpm) and groupB (59 patients with heart rate>65 bpm). Motion artifact index (MAI) of left anterior descending artery (LAD), leftcircumflex artery(LCX) and right coronary artery (RCA) were calculated before and after applied SSF technique.Image quality of CCTA was independently assessed by two radiologists using a 5-point scale and then analyzedquantitatively. Results The mean heart rates was 63.5±5.69 for group A and 77.73±6.67 for group B respectively.For group A, MAI of image quality of SSF images(12.65±5.96) was lower than those of non-SSF images(24.10±8.62, P<0.05), and subjective score of image quality of SSF images(4.15±0.45) were higher than those of non-SSF images(3.00±1.04, P<0.05). For group B, MAI of image quality of SSF images(18.09±9.00) was lower thanthose of non-SSF images(66.99±17.49, P<0.01), and subjective score of image quality of SSF image (3.82±0.78)were higher than those of non-SSF images(1.96±0.67, P<0.01). The MAI decrease rate of SSF image in group B(73%) was better than group A (48%). Conclusions SSF algorithm could improve image quality of CCTA, especiallyin patients with heart rate higher than 65bpm.

关 键 词：冠状动脉 X线计算机 体层摄影术 

分 类 号：R445.3[医药卫生—影像医学与核医学]