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.
出处
《放射学实践》
2008年第8期843-845,共3页
Radiologic Practice
关键词
体层摄影术
X线计算机
成像
三维
动脉闭塞性疾病
Tomography,X-ray computed
Imaging,three-dimensional
Arterial occlusive diseases
