HDCT不同扫描模式对国产冠状动脉支架成像管腔显示的影响：体模实验研究  

Impact of Scanning Mode of HDCT on Image Quality of Coronary Artery Stent:an Experimental Study

作　　者：范丽娟[1] 徐冬生[1] 张计旺[1] 孙凤伟[1] 张立仁[1] 

机构地区：[1]天津医科大学心血管临床学院,泰达国际心血管病医院放射科

出　　处：《中国医学计算机成像杂志》2015年第2期172-175,共4页Chinese Computed Medical Imaging

基　　金：天津市滨海新区卫生局科技项目(2012BWKZ022)~~

摘　　要：目的:探讨HDCT高清(HD)和非高清(NHD)扫描模式显示不同内径冠状动脉支架的区别。方法:不同直径的乐普316L和L605支架各5枚,分别注入稀释后CT值为300HU(管电压120k V时测量)的碘对比剂。丙烯腈-丁二烯-苯乙烯树脂制成空心管状结构模拟冠状动脉,将支架分别置入每支模拟冠状动脉内,封闭开口后固定于一圆柱形塑料瓶外,并将瓶内注入同样CT值的对比剂溶液模拟心腔,再将模型静置于注满水的塑料盒内上机扫描。对支架体模分别进行HD模式和NHD模式扫描。采用前瞻性心电门控扫描,心电模拟规则心跳60次/min,仅采集75%R-R间期时相,采用HD Detail(HD组)和Detail(NHD组)模式后重建。测量所有支架内径、分别计算支架的平均内径测量值及支架腔内显示率,并进行统计学分析。结果:HD组支架内腔平均显示率为(49.2±8.9)%,NHD组支架内腔平均显示率为(45.9±10.0)%,两组差异有统计学意义(t=-5.250;P<0.05),HD组支架管腔显示率较NHD组高约7.2%。316L组支架平均显示率(50.3±7.3)%,L605组支架平均显示率(44.8±10.7)%,两组差异无统计学意义(t=1.350;P>0.05)。5枚316L支架中,两种扫描模式在直径2.5mm和4mm支架管腔显示率上差异无统计学意义(P=0.785和P=0.468)。结论:HDCT HD扫描模式对内径≥2.75mm且<4.00mm的冠状动脉支架的显示效果优于NHD扫描模式,对于显示内径<2.75mm和≥4.00mm的冠状动脉支架,两者无显著差异。Purpose：To explore the differences of image quality of coronary stent with various diameters between that acquired with high-definition（HD） and non-high-definition（NHD） scan mode by HDCT.Methods：Ten coronary artery stents of different material and diameter were studied.Five stents were made of stainless surgical steel（316L）,five were made of cobalt-chromium alloy（L605）.All stents were implanted in a coronary vessel phantom made of a plastic tube filled with contrast material.Images were acquired on a HDCT scanner,the Discovery CT750 HD,with two scan mode of high-definition and standard-definition.Prospective ECG-gating scanning mode was used,the simulate heart rate was 60 bpm,and 75%R-R interval images were acquired with HD Detail（HD） and Detail（NHD） mode reconstruction.Stent diameters were measured.The mean inner diameter and visibility of different type stents were calculated and compared between two groups.Results：There was a statistical difference of the measured inner stent diameter between HD group（49.2±8.9）%and NHD group（45.9± 10.0）%（P〈0.05）.The visibility of HD group was 7.2%higher than that of NHD group.For stents diameter of 2.50 mm and 4.00 mm of 316 L,there was no statistical difference in visibility between them.Conclusion：HD scan mode of HDCT is better than NHD to visualize stents from 2.75 mm to 4.00 mm.For stents with diameter 〈2.75 mm or ≥4.00 mm,there is no significant difference between these two modes.

关 键 词：冠状动脉疾病 X线计算机 体层摄影 支架 

分 类 号：R816.2[医药卫生—放射医学] R543.3[医药卫生—临床医学]