不同造影剂注射速率对下腔静脉直接法CTV成像图像质量的影响

The Effect of Contrast Medium Injection Rate on the Image Quality of Inferior Vena Cava Direct CTV

目的:通过改变造影剂注射速率的方式,进行多排螺旋CT直接法下腔静脉成像并对图像质量的优劣对比,寻找造影剂速率的最佳注射方案。方法:采用Siemens公司的64排螺旋CT,对临床疑诊疾为下腔静脉疾病的患者30例行直接法多排螺旋CT下腔静脉扫描,随机分为5组,在相同造影剂浓度(1︰4)、液体量(单侧液体量200 m L)、延迟扫描时间(30 s)及不结扎下肢浅静脉等同一条件下,每组造影剂注射速率分别采用2.5,3.0,3.5,4.0和4.5 m L/s,比较各组图像质量优劣。结果:所有患者均顺利完成检查,秩和检验各组间图像质量不完全相同(χ~2=21.254,P<0.001),3.5~4.0 m L/s造影剂注射速率的图像质量主要为良及以上,达到临床诊断要求,为最佳流速范围。两组间行χ~2检验,χ~2=1.588,P>0.05,两组间图像质量总体分布无显著差异。结论:下腔静脉多排螺旋CT直接法成像切实可行,在相同造影剂浓度(1︰4)、液体量(单侧液体量200 m L)、延迟扫描时间(30 s)、不结扎下肢浅静脉等条件下,最佳造影剂注射速率3.5~4.0 m L/s。

Objective： By comparing the image quality of the inferior vena cava （IVC） direct CT venography （CTV） using multi-detector computed tomography （MSCT）, under different contrast medium injection rate conditions, to obtain optimal contrast medium injection rate, Methods： Using 64-detector row scanner （Sensation 64; Siemens）, 30 patients who were suspected of inferior vena cava diseases underwent IVC direct CTV examination. Randomly divided into 5 groups, at the same conditions of contrast medium concentration （1 ： 6）, liquid volume （unilateral liquid volume 200 mL）, delay scan time （30 s） and without ligation of superficial veins of lower limbs, the contrast medium injection rate of each group was 2.5, 3.0, 3.5, 4.0, 4.5 mL/s respectively, then compare the image quality of each group. Result： All patients successfully completed the examination, the image quality of contrast medium injection rate 3.5-4.0 mL/s group is better than others, satisfied with clinical diagnostic purpose. Conclusion： IVC direct CTV using MDCT is feasible, at the same conditions of contrast medium concentration （1 ： 4）, liquid volume （unilateral liquid volume 200 mL）, and delay scan time （30 s） and without ligation of superficial veins of lower limbs, the optimal contrast medium injection rate is 3.5-4.0 mL/s.