多层CT下肢动脉扫描时间与不同准直器宽度的相关性研究  

Study of the Correlation of Scanning Time and Different Widths of Collimators in Lower Limb MSCT Angiography

作　　者：刘永华[1] 陈险峰[1] 杨明[1] 韩萍[1] 史河水[1] 

机构地区：[1]华中科技大学同济医学院附属协和医院放射科,武汉430022

出　　处：《放射学实践》2008年第8期843-845,共3页Radiologic Practice

摘　　要：目的：探讨多层CT下肢动脉扫描时间与两种准直器宽度的相关性。方法：对70例临床诊断疑似下肢动脉闭塞的病例分实验组和对照组进行CTA检查，每组病例35例。实验组采用16×1、5mm准直器宽度，对照组16×0．75mm准直器宽度，两组扫描参数一致，扫描范围均为1100～1200mm，对两种准直器宽度的扫描时间、对比剂用量以及Z轴的覆盖范围进行统计学分析，并列表显示。结果：使用两种不同的准直器宽度扫描，实验组扫描时间是18．13±5．12，对照组是31、43±3．12，对比剂用量实验组是（80±10）ml，对照组是（120±20）ml，实验组的Z轴覆盖范围是24mm，比对照组增加1倍。结论：使用16×1、5mm的准直器宽度扫描，可以大大缩短扫描时间，扩大Z轴的覆盖范围，减少对比剂的用量。Objective; To investigate the correlation between scanning time and collimation in lower limb MSCT angiography. Methods： 70 patients suspected of having lower limb arterial occlusion were divided into the experimental group （n=35） and the control group （n=35）,both receiving CTA examination. 16×1.5mm collimation was used for the experi- mental group and 16×0.75mm collimation for the control group. The scan ranges were both 1100-1200mm and the scan paramters of the two groups were the same. The scanning time,volume of contrast material and the coverage on z-axis were analyzed statistically. Result：Using two different collimations, the scanning time in the experimental group and the control group was （18.13±5.12）s and （31.43±3.12）s respectively,the volume of contrast material was （80±10）ml and （120±20）ml respectively,and the coverage on z axis was 24mm in the experimental group,doubling that in the control group. Conclusion：The 16×1.5mm collimation can markedly reduce the scanning time and volume of contrasts material,in the mean time it can extend the coverage on z-axis.

关 键 词：体层摄影术 X线计算机 成像 三维 动脉闭塞性疾病 

分 类 号：R816.2[医药卫生—放射医学]