MR Cholangiography in Potential Liver Donors: Quantitative and Qualitative Improvement With Administration of an Oral Effervescent Agent

Abstract

Purpose: To determine whether an oral effervescent agent improves magnetic resonance cholangiography (MRC) images, both qualitatively and quantitatively, in potential live liver donors. Materials and Methods: This retrospective study was approved by the Institutional Review Board, and informed consent was waived. Seventy potential liver donors underwent 2D MRC before and after administration of an oral effervescent agent. One radiologist measured relative contrast ratio (rC) and relative signal intensity (rS) for right and left intrahepatic ducts (RHD and LHD), and common hepatic duct (CHD). After assessment of overall image quality, two other radiologists independently scored visualization of five ductal segments (RHD, LHD, CHD, cystic, and common bile duct) and assessed the preferred image set. In consensus, they assessed the biliary anatomy. The data were analyzed using a paired t-test, Wilcoxon's signed-rank test, and chi-square test. Results: Both rC and rS of RHD and CHD were significantly higher on MRC images after administration of an oral effervescent agent than before (P < 0.03). The overall image quality grades and biliary visualization scores for all five duct segments were significantly higher on MRC images after administration of an oral effervescent agent than before (P < 0.0001). Between these images, both readers more often preferred MRC images with an effervescent agent rather than those without this agent (reader 1: 56/70, 80.0%; reader 2: 55/70, 78.6%; P=0.0003). The readers correctly assessed second-order biliary tract anatomy in two more subjects on MRC after administration of an effervescent agent than before. Conclusion: Oral administration of an effervescent agent improves MRC images, both qualitatively and quantitatively, in live liver donors.