MR胆管水成像和钆贝葡胺增强胆管成像对肝移植供体胆管显示的对照研究

目的 探讨MR胆管水成像(T2WI-MRC)和钆贝葡胺增强后胆管成像(CE-MRC)对肝移植供体胆管显示的差别.方法 32名肝移植供体术前均行T2WI-MRC和CE-MRC检查,以术中胆管造影结果为金标准,对比2种成像方法对肝内外胆管的显示情况,并对胃肠内液体影、呼吸引起的运动伪影进行比较.结果 胆管变异9名,2种检查方法均正确诊断.2种方法均可清楚显示3级肝内胆管,T2WI-MRC有28名(87.5%)能显示肝内3级以上胆管,CE-MRC只有14名(43.8%)可以显示.2名受检者T2WI-MRC显示胆总管不连续,CE-MRC及术中胆管造影显示胆总管正常.T2WI-MRC有6名(18.8%)受检者肠道内液体影响胆管显示,CE-MRC则无一名受检者肠道液体影响胆管显示.呼吸引起的运动伪影2种检查方法均不明显.结论 T2WI-MRC和CE-MRC均可用来评估术前肝移植供体胆管解剖,但CE-MRC受肠道液体影响少,较T2WI-MRC对于肝内3级以上胆管显示具有优势.

Comparison between T2-weighted MR and contrast-enhanced MR cholangiography in the evalutian of biliary anatomy in liver transplant donor candidates

Objective To compare conventional T2-weighted MR cholangiography (T2WI-MRC) with gadobenate dimeglumine enhanced T1-weighted MR cholangiography(CE-MRC) for evalution of biliary anatomy in liver transplant donor candidates. Methods Thirty-two healthy liver transplant donor candidates were examined with two MR cholangiogaphic methods. For T2WI-MRC, a three-dimensional turbo spin-echo sequence and oblique coronal heavily T2-weighted thick-slab turbo spin-echo imaging sequence were performed. For CE-MRC, three-dimensional fat-suppressed spoiled gradient-echo sequences were performed, with a time delay of 60 minutes following the administration of gadobenate dimeglumine. To compare the depiction of biliary duct anatomy and the artifact caused by intestinal liquid and breathing between the two methods. Intraoperative cholangiography was the reference-standard examination. Results The both methods depicted the biliary anatomy correctly in all 9 cases. The both methods showed the third branches of intrahepatic biliary duct clearly. T2WI-MRC showed interhepatic bihary duct before the third branches in 28 cases (87.5%), CE-MRC showed the same finding in 14 cases (43.8% ). T2WI-MRC showed common bile ducts intermitantly in 2 cases, which were normal in CE-MRC and intraoperative cholangiography. Intestinal liquid affected the image quality of biliary duct in 6 cases (18.8%) performed with T2WI-MRC, but none with CE-MRC. The artifacts caused by breathing were not obvious in the either method. Conclusion T2WI-MRC and CE-MRC both can be used to evaluate bihary anatomy of liver transplant donor candidates, but CE-MRC appears to be more accurate than T2WI-MRC.