- 期刊
- OpenAccess
Common Bile Duct Diameter Measurement by Magnetic Resonance Cholangiopancreatography
膽道胰管磁振造影術測量總膽管直徑
並列摘要
The aim of this study is to compare the diameters of proximal and distal common bile duct (CBO) using magnetic resonance cholangiopancreatography (MRCP). The results may help in the daily MR interpretation of CBO and hepatobiliary disease.From January 10 December 2006, a total of 153 subjects were recruited into our study. One hundred and twelve asymptomatic subjects who underwent health examinations including MRCP were recruited into the normal group. The remaining 41 patients were placed into the disease group, and their diagnosis included benign strictures (18), choledocholithiasis (14), gall stone with CBO dilation (3), cholecystectomy (4) and ampulla vater cancer (1). CBO measurements were performed using single shot thick slab MRCP projection. The CBO segment was divided into the proximal and distal parts. The largest diameters of both segments were recorded by two reviewers. Paired t-test was used to compare the difference between the proximal and distal CBD diameters, and regression analysis was used to analyze the difference between the normal and disease group.Proximal CBD (11.7 ± 2 .9 mm for reviewer A, 12.4 ± 3.3 mm for reviewer B) was significantly larger than distal CBD (8 .3 ± 2. 1 mm for reviewer A, 10.8 ± 2.3 mm for reviewer B) in the disease group (p ＜ 0.001). Similar result was seen in the normal group, with the proximal CBD (4.4 ± 2.0 mm for reviewer A, 5.0 ± 2.1 mm for reviewer B) significantly larger than the distal CBD (3.9 ± 1. 9 mm for reviewer A, 4.4 ± 2.0 mm for reviewer B) (p ＜ 0.001). Despite the presence of confounding factors (age and sex), CBD diameters in the disease group are significantly larger than that of normal group in both proximal and distal CBD (p ＜ 0.001).MRCP measurement of CBD diameter is easy and non-invasive. The proximal part is significantly larger than the distal part in both normal and disease groups. Therefore measuring only the distal segments of CBD may underestimate the degree of obstruction.