64排螺旋CT下肢动脉成像质量控制与评估动脉狭窄的效果研究  

The quality control of 64-slice spiral CT on lower extremity artery imaging and assessment on lower extremity artery stenosis

作　　者：李伟[1] 陈雄钊[1] 胡茂清[1] 李锦蓉[1] 罗学毛[1] 龙晚生[1] 

机构地区：[1]广东省江门市中心医院放射科,广东江门529030

出　　处：《海南医学院学报》2009年第9期1018-1023,共6页Journal of Hainan Medical University

基　　金：海南医学院科研基金资助学报项目(0020090132)~~

摘　　要：目的:探讨影响64排螺旋CT下肢动脉成像质量的各种因素及其消除方法,和其在评估下肢动脉狭窄的效果。方法:选取2007年3月～2009年4月进行64排螺旋CT下肢动脉成像的患者180例,其中有80例在1周内进行了常规下肢动脉造影。将CT下肢动脉成像图像分为6个级别打分,通过得分情况分析出影响64排螺旋CT下肢动脉成像的因素。以常规造影为标准,把动脉狭窄分为<50%、50%～74%、75%～99%、闭塞4个级别,分析64排螺旋CT下肢动脉成像的灵敏度、特异性。结果:影响64排螺旋CT下肢动脉成像的因素有造影剂(速度/浓度/剂量)、延迟时间、扫描参数(旋转时间/螺距)、血管钙化、重建技术、患者年龄等,64排螺旋CT下肢动脉成像在动脉狭窄<50%、50%～74%、75%～99%、闭塞的灵敏度、特异性分别为(46.5%、89.2%)、(60.6%、91.8%)、(76.5%、95.4%)、(87.1%、98.3%)。结论:64排螺旋CT下肢动脉成像具有多种重建模式,是一种准确的、非侵袭性的成像技术,其在很大程度上能满足临床要求。Objective： To study the various factors in imaging quality of lower extremity artery by 64- slice spiral CT and its elimination approaches, and to assess its diagnostic accuracy on lower extremity arterial stenosis. Methods： 180 artery images, from Mar. 2007 to Apr. 2009, of lower extremity taken by 64-slice spiral CT, were enrolled, of which 80 cases were examined by conventional lower extremity arteriography in a week. The image quality was marked as 6 levels, the impact factors were analyzed through scoring. Conventional angiography was regarded as standard, artery stenosis was graded as 〈50%, 50% - 74%, 75% - 99% and occlusion, the sensitivity and specificity of 64-slice spiral CT on lower extremity artery image were analyzed. Results ： The impact factors of artery images of 64-slice spiral CT were contrast medium （ speed / concentration / dosage）, delay time, scanning parameters （rotation time / pitch）, vascular calcification, reconstruction techniques, patient＇s age. The sensitivity and specificity of artery stenosis of 64-slice spiral CT on artery imaging of lower extremity were （46.5%, 89.2% ）, （60.6%, 91.8% ）, （76.5%, 95.4% ）, （87.1%, 98.3% ）, respectively. Conclusions ： The artery imaging of 64-slice spiral CT on lower extremity possesses varied reconstruction modeling. It is a precise and noninvasive imaging technique, at a large extents, this imaging technique can meet the clinical requirements

关 键 词：体层摄影术 X线计算机 下肢动脉成像 质量控制 动脉狭窄 血管造影术 

分 类 号：R814.42[医药卫生—影像医学与核医学] R543.5[医药卫生—放射医学]