摘要
目的 探讨320排容积CT（DVCT）冠状动脉血管成像患者心率,重组时相与图像质量的关系.方法 对2008年12月至2009年7月在济南军区总医院接受DVCT 80例患者行回顾性分析,其中男43例、女37例,年龄34～79（64±8）岁.以10%为间期,重建10%～100%R-R间期各时相图像.2位阅片者以图像质量1级（无运动伪影）至4级（严重伪影）对3支主要冠状动脉（右冠状动脉、前降支及左旋支）进行评价.分析心率对图像质量及收缩期/舒张期比例的影响;评价最佳重建时相与心率的关系.结果 平均扫描心率为47～128（71±15）次/min.随着心率的增加,3支冠状动脉平均图像质量评分呈线性增加（y=-0.154＋0.022x,t=11.0,P＜0.01）.在心率＜98次/min时,即可得到1、2级图像.收缩期/舒张期比例随心率的增加而增加（t=10.8,P＜0.01）,同时随着心率的增加,收缩期及舒张期最佳重建期相均向后推移.当心率＞93次/min时最佳图像重建时相由舒张期转为收缩期.结论 DVCT可在更宽心率范围内获得优良冠状动脉图像;对DVCT不同心率最佳重建时相的研究,有助于获得优良图像质量,减少患者吸收剂量.
Objective To investigate the impact of hart rate （HR） and reconstruction timing on image quality by a 320-detector row dynamic volume CT system （DVCT）. Methods A total of 80 patients were examined by DVCT angiography. There were 43 males and 37 females with a mean age of 64 ± 8 years old. The heart rate （HR） was 47 - 128 beats per minute. The data were reconstructed by 10% steps throughout the R-R interval. And the data sets were evaluated by 2 independent readers for each major coronary vessel, namely right coronary artery, left anterior descending artery and left circumflex artery. The motion score for each vessel was graded from 1 （ no motion artifacts） to 4 （ severe motion artifacts over an entire vessel）. The HR dependency of image quality was determined by an analysis of linear regression. The linear regression between HR and the optimal image quality in diastole or systole was also calculated.Results The average HR was 71 ± 15 beats per minute. And the image quality was significantly affected
出处
《中华医学杂志》
CAS
CSCD
北大核心
2011年第1期5-10,共6页
National Medical Journal of China
作者简介
通信作者：孙钢，E-mail：cir．sungang@vip．163．com
