3.0T MRI流入反转恢复序列在门静脉非对比增强成像中的应用

Application of inflow inversion recovery sequence in non-enhanced 3.0 T MR portal venography

目的探讨3.0 T MR流入反转恢复(IFIR)序列对门静脉系统进行非对比增强成像的可行性。方法 60例疑诊上腹部病变患者行3.0 T MRI门静脉冠状位IFIR序列扫描及肝脏快速容积采集(LAVA)技术增强扫描,将扫描图像在工作站行三维MIP重建,由两名有经验的影像诊断医生分析两种方法对门静脉及其分支的显示,并进行评分,比较两者对门静脉显示的差异。结果 60例IFIR序列均能显示门静脉主干及肝内1、2级分支,其中门静脉成像评分5分16例,4分20例,3分21例,2分3例;60例LAVA序列均能显示门静脉主干及肝内1级分支,其中门静脉成像评分5分14例,4分24例,3分18例,2分3例,1分1例,两种方法门静脉成像评分的差异无统计学意义(P>0.05)。结论 3.0 T MRI IFIR成像序列能在不用对比剂情况下获得与增强MRA相似成像效果的门静脉系统图像。

Objective To evaluate the feasibility of inflow inversion recovery sequence in non-enhanced 3.0 T MR portal venography. Methods Portal vein imaging with the inflow inversion recovery（IFIR） sequence and with the liver acquisition volume acceleration（LAVA） sequence was performed on 60 patients with suspected abdominal disease using 3.0 T MRI. MIP reconstructed images of both sequences were scored from 1 to 5 by two experienced radiologists to compare the image quality of the branches and trunk of the portal vein. Results The IFIR sequence showed the first and second portal vein branches in all 60 patients with highest image quality score of 5 in 16, score 4 in 20, score 3 in 21, score 2 in 3. The LAVA sequence showed the first branches in all 60 patients with score of 5 in 14, score 4 in 24, score 3 in 18, score 2 in 3, score 1 in 1. There was no significant difference between the scores of the two sequences（P〉0.05）. Conclusion IFIR sequence is a feasible non-enhanced MR imaging method with imaging quality of the portal vein similar to the contrast-enhanced MRA at 3.0 T MRI.