新型非对比剂增强MR血管成像技术用于肝门静脉成像的可行性研究

Feasibility of A Novel Non-contrast Enhanced MR Angiography for Hepatic Portal Vein Imaging

本研究探讨了非对比剂非触发增强磁共振血管成像技术(REACT)用于肝门静脉成像的可行性。前瞻性研究22名健康志愿者分别行上腹部平衡式梯度回波序列(BTFE)和REACT序列扫描,比较两组序列图像整体显示质量评分,以及肝门静脉主干、左支、右支的最小与最大信号强度比值(RSI)、信噪比(SNR)以及对比信噪比(CNR),采用配对t检验或配对秩和检验分析RSI、SNR及CNR在两组间差异,采用Kappa检验评估图像质量评分的一致性。结果显示REACT组肝门静脉整体图像质量平均评分(3.86)略高于BTFE组(3.2),两组间差异具有统计学意义(Z=-4.6,P<0.05);BTFE组肝门静脉的RSI数值(0.81)略高于REACT组(0.76),REACT组肝门静脉主干、左右支的SNR、CNR显著高于BTFE组,两组间差异均具有统计学意义(Z值-4.57~-3.82,P值均<0.05)。因此,REACT序列的图像质量要优于BTFE序列,同时运用水脂分离技术(Dixon)抑脂的REACT序列得到的背景信号更加干净,门静脉血管成像显示也更为清晰。

This study explored the feasibility of using relaxation-enhanced MR angiography without contrast and triggering(REACT)for imaging the hepatic portal vein,and to explore.Prospective study of 22 healthy volunteers who underwent upper abdominal imaging with balance turbo field echo(BTFE)and REACT sequences.The overall image quality score,the ratio of minimum to maximum signal intensity(RSI),signal to noise ratio(SNR)and contrast to noise ratio(CNR)of the main hepatic portal vein,right portal vein and left portal vein were compared between the BTFE group and the REACT group.Paired t-test or paired rank sum test was used to analyze the differences in RSI,SNR,and CNR between the two groups,and Kappa test was used to evaluate the consistency of image quality scores.The results showed the average score of overall image quality of hepatic portal vein in REACT group(3.86)was slightly higher than that in BTFE group(3.2),and the difference between the two groups was statistically significant(Z=-4.6,P<0.05).The RSI of hepatic portal vein in BTFE group(0.81)was slightly higher than that in REACT group(0.76).The SNR and CNR of hepatic portal vein trunk,left and right branches in REACT group were significantly higher than those in BTFE group,and the differences between the two groups were statistically significant(Z value-4.57--3.82,P<0.05).Therefore,the image quality of REACT sequence is a little better than that of BTFE sequence in non-contrast enhanced portal vein angiography.In addition,the use of water-fat separation technology(Dixon)to suppress fat in the REACT sequence can obtain a cleaner background signal,and the imaging display of hepatic portal vein is clearer.