不同翻转角对3.0T Gd-EOB-DTPA增强胆道系统图像质量影响的研究  

Study on the effect of different flip angles on the image quality of Gd-EOB-DTPA-enhanced 3.0T MRI in biliary tract system imaging

作　　者：蔡磊[1] 陈国勇[1] 吕琴 熊凡 唐鹤菡[1] CAI Lei;CHEN Guo-yong;LV Qin;XIONG Fan;TANG He-han(Department of Radiology,West China Hospital,Sichuan University,Chengdu 610041,China)

机构地区：[1]四川大学华西医院放射科,四川成都610041

出　　处：《中国临床医学影像杂志》2022年第2期118-121,126,共5页Journal of China Clinic Medical Imaging

摘　　要：目的:探讨不同翻转角(FA)对Gd-EOB-DTPA胆道系统成像图像质量的影响。方法:研究纳入31例行Gd-EOBDTPA上腹部MRI增强的患者,采用T1加权三维容积式内插值法屏气检查(VIBE)序列进行扫描,获取FA分别为9°、20°、30°、45°、60°的斜冠状位图像。测量胆道系统各部位(胆囊、左肝管、右肝管、肝总管、胆总管)的信号强度(SI),比较不同FA之间各部位的信噪比(SNR)、对比噪声比(CNR)的差异;采用5分法评价胆道可视性及伪影表现。结果:(1)FA=30°~60°时,胆道各部位图像的SNR均明显高于FA=9°的图像(P<0.05),但FA=30°、45°、60°之间,SNR无统计学差异(P>0.05),左肝管及胆总管SNR在FA=30°时最优,右肝管、肝总管、胆总管及胆囊SNR在FA=45°时最优;(2)FA=30°~60°时胆道各部位图像的CNR均明显高于FA=9°的图像(P<0.05),左肝管、右肝管、肝总管、胆总管图像CNR在FA=30°~60°时均高于FA=20°的图像(P<0.05),左肝管CNR在FA=30°最优,右肝管、肝总管、胆总管及胆囊CNR在FA=45°时最优;(3)FA=30°~60°胆道可视性均高于FA=9°和FA=20°的图像,但FA=60°时伪影增多、图像质量有所下降。结论:Gd-EOB-DTPA增强胆道系统成像中,增大FA(FA=30°~60°)可提高图像SNR及CNR,但FA过大(FA=60°)将导致图像伪影增加,我们推荐在FA=45°作为3T临床扫描延迟成像中Gd-EOB-DTPA增强T1WI肝胆道成像的最佳FA。Objective:To investigate the effect of different flip angles(FA)on the image quality of Gd-EOB-DTPA biliary tract system imaging.Methods:Thirty-one patients undergoing Gd-EOB-DTPA upper abdominal MRI enhancement were scanned by T1-weighted three-dimensional volumetric interpolated breath-hold examination(VIBE)sequence,and oblique coronal images were obtained with the FA of 9°,20°,30°,45°,and 60°,respectively.The signal intensity(SI)of various parts of the biliary system(gallbladder,left hepatic duct,right hepatic duct,common hepatic duct and common bile duct)was measured,and the differences of signal-to-noise ratio(SNR)and contrast to noise ratio(CNR)between different FA were compared.Biliary tract visibility and artifact appearance were evaluated by 5-point method.Results:(1)When FA=30°~60°,the SNR of each part of biliary tract was significantly higher than that of FA=9°(P<0.05),but there was no significant difference between FA=30°,45°and 60°(P>0.05).The SNRs of left hepatic duct and common bile duct were the best when FA=30°,and SNRs of right hepatic duct,common hepatic duct,common bile duct and gallbladder were the best when FA=45°.(2)When FA=30°~60°,the CNR of each part of biliary duct was significantly higher than that of FA=9°(P<0.05),the CNRs of left hepatic duct,right hepatic duct,common hepatic duct and common bile duct were higher than those of FA=20°(P<0.05).The CNR of left hepatic duct was the best when FA=30°,and the CNRs of right hepatic duct,common hepatic duct,common bile duct and gallbladder were the best when FA=45°.(3)The biliary tract visibility of FA=30°~60°was higher than that of FA=9°and FA=20°images,but the image quality decreased when FA=60°with more artifacts.Conclusion:In Gd-EOB-DTPA enhanced biliary tract imaging,increasing the FA(FA=30°~60°)can improve the image SNR and CNR,but too large FA(FA=60°)will lead to the increase of image artifacts.We recommend FA=45°as the optimal FA for Gd-EOB-DTPA enhanced T1 WI hepatobiliary imaging at 3 T scanner.

关 键 词：肝疾病 磁共振成像 

分 类 号：R575[医药卫生—消化系统] R445.2[医药卫生—内科学]