时间分辨力-心动周期特性曲线在CT冠状动脉成像中的应用  

Application of temporal resolution-cardiac cycle curve in multi-slice spiral CT coronary angiography

作　　者：夏平[1] 徐青松[1] 郝敬明[1] 胡春艾[1] 曹伟[1] 师毅冰[1] 夏有生[1] 

机构地区：[1]徐州市中心医院CT室,江苏徐州221009

出　　处：《中国医学影像技术》2015年第1期127-131,共5页Chinese Journal of Medical Imaging Technology

摘　　要：目的评价时间分辨力-心动周期特性曲线在CT冠状动脉成像中的应用价值。方法将126例接受CT冠状动脉成像的患者作为研究组,根据患者心率采用不同的球管转速,并进行三扇区扫描。采用双扇区和三扇区两种方法重建。对照组为30例心率〈65次/分患者,采用350ms/rot的球管转速扫描,单扇区重建。比较各种球管转速、不同重建算法、不同心率分组的图像质量。结果双扇区图像质量评分1级1191节段（1191/1708,69.73%）,三扇区图像质量评分1级1370节段（1370/1708,80.21%）,对照组图像质量评分1级348节段（348/418,83.25%）,双扇区图像质量与对照组比较差异有统计学意义（Z=4.60,P〈0.001）;三扇区与对照组比较差异无统计学意义（Z=0.15,P=0.13）。不同球管转速间图像质量评分差异无统计学意义（χ2=0.98,P=0.61）。结论依照三扇区时间分辨力-心动周期曲线最佳成像条件选择扫描参数,可在65~122次/分的心率范围内获得优质、稳定的图像质量。Objective To evaluate the applicable value of temporal resolution-cardiac cycle curve in the multi-slice spiral CT coronary angiography（MSCTCA）.Methods Totally 126 patients undergoing MSCTCA with 320-slice spiral CT were enrolled.Optimum gantry rotation was chosen according to patient＇s heart rate,and scanning was done with three segment reconstruction algorithms.Scan data was reconstructed with two segment reconstruction algorithms and three segment reconstruction algorithms respectively.In control group,30 patients whose heart beat were〈65bpm were treated with 350ms/rot gantry rotation and half reconstruction.Image qualities were compared from the different gantry rotation,reconstruction algorithm and heart rate.Results All of 1191segments（1191/1708,69.73%）were graded score 1in two segment reconstruction algorithms;1370segments（1370/1708,80.21%）were graded score 1in three segment reconstruction algorithms;348segments（348/418,83.25%）were graded score 1in control group.There was significant difference between two segments reconstruction algorithms and control group（Z=4.60,P〈0.001）.There was no significant difference between three segment reconstruction algorithms and control group（Z=0.15,P=0.13）.Different gantry rotations had no influence on image quality（χ2=0.98,P=0.61）.Conclusion According to the curve of temporal resolution-cardiac cycle,high image quality can be acquired in a range of heart rate of 65—122bpm for CTCA through three segment reconstruction algorithms.

关 键 词：体层摄影术 X线计算机 冠状血管 时间分辨力 球管旋转时间 

分 类 号：R543.3[医药卫生—心血管疾病] R814.42[医药卫生—内科学]