摘要
目的：探讨月国动脉监测触发扫描对64层螺旋CT下肢动脉血管造影（CTA）成像质量的影响。方法：该项前瞻性研究共纳入62例患者,采用Toshiba Aquilion 64扫描仪和月国动脉监测触发扫描进行下肢动脉CTA。主观评价每例患者主-髂部、股-月国部及膝下部3段动脉的VR和MIP图像质量和整体图像质量,并对3段动脉的增强CT值进行方差分析,记录下肢动脉节段的显示数目和出现下肢远端静脉显影的例数。结果：1例患者因双侧月国动脉闭塞未能触发扫描,其余61例患者中VR总体图像质量优秀、良好、中等和差分别为33例（54.1%）、23例（37.7%）、4例（6.6%）和1例（1.6%）,优良率为91.8%（56/61）;MIP总体图像质量优秀、良好、中等和差分别为41例（67.2%）、17例（27.9%）、2例（3.3%）和1例（1.6%）,优良率为95.1%（58/61）;主-髂部、股-月国部及膝下部平均增强CT值分别为（536.42±99.68）Hu（352.43~742.71Hu）、（541.72±119.05）Hu（338.38~800.75Hu）和（421.29±97.15）Hu（264.58~739.00Hu）,方差分析显示三部分血管间平均CT值有统计学差异（F=25.25,P=0.00）;下肢动脉节段显示率为98.9%（1531/1549）,22.9%（14/61）的患者出现下肢静脉显影。结论：多层螺旋CT下肢动脉血管成像采用月国动脉监测触发扫描能获得较好的图像质量,下肢动脉远端分支可能显示不佳和静脉显影是其不足,对于双侧月国动脉闭塞的患者则会导致无法触发。
Purpose： To evaluate the effect of using a monitoring scan at knee level on image quality for 64-row detector CT angiography of aortoiliac and lower extremity arteries.Methods： The study was performed with approval of the institutional review board and with informed consent of the subjects.A total of 62 subjects were included in this prospective study.The monitoring trigger was sited at knee level of the popliteal artery for CT angiography.Image analysis was performed as follows：Subjective evaluation of the image quality of aorto-iliac area,femoro-popliteal district and run-off vessels with VR and MIP reconstruction respectively;Calculation of the CT value of aorto-iliac area,femoro-popliteal district and run-off vessels;and evaluation of the data by variance analysis;Evalution of the distal arterial and venous visibility.Results：The monitoring scan at the level of the popliteal artery was unavailable in 1 case.The overall quality of VR images in 33 of the 61 patients（54.1%） were categorized as excellent,in 23（37.7%）as good,in 4（6.6%）as fair,and in 1（1.6%）as poor,the rate of excellent and good was 91.8%;MIP images in 41（67.2%）as excellent,in 17（27.9%）as good,for 2（3.3%）as fair,and for 1（1.6%）as poor,the rate of excellent and good was 95.1%.There was a high consistency between two observers（VR：Kappa=0.719;MIP：Kappa=0.678）.The mean CT values measured at aorto-iliac area,femoro-popliteal district and run-off vessels were 536.42Hu±99.68 Hu（352.43～742.71Hu）,541.72Hu±119.05 Hu（338.38～800.75Hu）and 421.29Hu±97.15 Hu（264.58～739.00Hu）,respectively.There were significant differences among these three segments（F=25.25,P=0.00）.The rate of distal arterial and venous visibility were 98.9%（1531/1549）and 22.9%（14/61）,respectively.Conclusion： Using a monitoring scan at knee level was useful for 64-row detector CT angiography of aortoiliac and lower extremity arteries.Its drawbacks include inadequate opacification of distal arterial branches and veno
出处
《中国医学计算机成像杂志》
CSCD
北大核心
2011年第2期150-154,共5页
Chinese Computed Medical Imaging
基金
广东省自然科学基金项目(项目编号:8151008901000210)~~
