3.0T MR自由呼吸冠状动脉成像的重建及定量分析  

Reconstruction and Quantitative Analysis of Free-breathing Coronary MRA at 3.0T

作　　者：常时新[1] 郝楠馨[1] 杜育杉[1] 王葳[1] 宗根林[1] 王怡彬[1] 汪波[1] 

机构地区：[1]上海市东方医院放射科,200120

出　　处：《中国医学计算机成像杂志》2006年第6期384-387,共4页Chinese Computed Medical Imaging

基　　金：上海市浦东新区科委资助项目$项目编号:PK05-3

摘　　要：目的:介绍一种MR冠状动脉成像后处理重建和定量分析的方法,探讨其临床应用价值。材料和方法:采用矢量心电门控技术(VCG)和自由呼吸导航技术,对85例临床疑为冠心病的患者进行了3.0T全心冠状动脉检查,所有数据均使用Soap-Bubble进行后处理重建和定量分析,参照冠状动脉标准分段法(ACC1999)对冠脉进行分段评价,以“优”、“良”、“差”三个级别评判冠状动脉图像质量,分析测量冠脉长度、判断冠状动脉狭窄的原因及程度。结果:92%(78/85)的受检者扫描获得成功,共获得图像质量能够满足影像学评价(内径≥2mm)的冠状动脉节段385个,发现冠状动脉狭窄程度≥50%的血管共26支。图像质量优者占26例(33.3%),良者占34例(43.6%),差者占18例(23.1%)。右冠、左前降支及旋支的长度分别是(124.8±8.5)mm、(95.4±2.6)mm、(74.6±3.4)mm;直接为(2.6±0.3)mm、(2.4±0.3)mm、(2.4±0.2)mm。结论:Soap-Bubble重建能够把扭曲变形的三维冠脉映射到一个平面上,去掉和冠脉无关的干扰信息并对冠脉进行定量分析,对冠状动脉狭窄程度和原因进行初步评价。Purpose： To introduce a method of Soap - Bubble reconstruction and quantitative analysis of free - breathing coronary MR angiography at 3T. Materials and Methods： Eighty - five patients who were suspected of having coronary artery disease were examined. Whole - heart coronary MR angiography was obtained at 3T by using a TFE sequence with VCG and free breathing navigator. Reconstruction and quantitative of whole - heart coronary MR angiography was performed in 85 patients by using Soap -Bubble Visualization following computer - assisted image segmentation respectively. The vessel length and diameter can be measured. The quality of coronary artery imaging was assessed as excellent, good and bad according to ACC1999. The presence of significant stenosis in the coronary artery was assessed. Results： Whole - heart coronary MR angiography was successfully completed in 78 of 85 patients （92%）. Three hundred eighty - five segment of coronary which the imaging quality accord with diagnosis were assessed （diameter≥2mm） and the detecting significant stenosis（≥ 50% ） were 26 arteries andwere found. The excellent of imaging quality were 26 cases （33.3%） and the good were 34 cases （43.6%） and the bad were 18 cases（23.1% ） The average vessel length of RCA, LAD and LCX was（124.8 ± 8.5） mm, （95.4 ± 2.6）mm, （74.6± 3.4）mm. The average vessel diameter of RCA. LAD and LCX was（2.6 ±0.3）mm, （2.4 ± 0.3） mm, （2.4 ± 0.2）mm. Conclusion： With a 3D delaunay triangulation and a parallel projection, Soap - Bubble enables the simultaneous display of multiple coronary segments in one 2D representation. The voxels that are not included in this user - prescribed subvolume are discarded. The reason and stenosis extent of coronary artery is quantitative analyzed.

关 键 词：磁共振成像 冠状动脉 血管造影术 后处理 

分 类 号：R445.2[医药卫生—影像医学与核医学]