正常人十二指肠乳头低张MR成像

目的 探讨正常人十二指肠乳头的低张MRI最佳成像方法。方法 将94名志愿者随机分为低张组(n=64)和对照组(n=30)。采用χ²检验比较两组中能够清晰显示十二指肠乳头的序列的百分率,及低张组内同一扫描方位MRI不同序列、同一序列不同层厚、不同扫描方位、不同后处理重建方法以及不同b值对十二指肠乳头显示率的差异。结果 低张组中能够清晰显示十二指肠乳头的序列的百分率高于对照组(P<0.01);轴位T2WI FS、T1WI FS对于十二指肠乳头显示率差异无统计学意义(P>0.05);层厚1.5 mm轴位T1WI FS较层厚3.0 mm T1WI FS显示十二指肠乳头更佳;轴位T2WI HASTE较冠状位显示十二指肠乳头更佳(P<0.05);T1WI FS重建斜冠状位更能清晰显示十二指肠乳头全貌(P<0.05);b值800 s/mm²较b值1 000 s/mm²显示十二指肠乳头更佳(P<0.05)。结论 MR序列中轴位T1WI FS(层厚1.5 mm)、轴位及冠状位T2WI HASTE(4 mm)、T1WI FS重建斜冠状位、b值800 s/mm²DWI对十二指肠乳头及壶腹区的显示明显优于其他序列,联合低张饮水可作为十二指肠乳头首选检查组合方式。

Hypotonic MRI of normal human duodenal papilla

Objective To investigate the best imaging method of the hypotonic MRI of normal human duodenal papilla. Methods Totally 94 healthy volunteers were collected, who were randomly divided into hypotonic group (n=64) and control group (n=30). Differences between two groups about proportion of the sequence that showed duodenal papilla clearly were compared by Chi-square test. In hypotonic group, the different MR sequences of the same scanning directions, the same sequence of different thickness, scanning directions, postprocessing reconstruction methods and different b values for the positive incidence of duodenal papilla were also compared with Chi-square test. Results The percentage of sequences which showed the papilla clearly was higher in the hypotonic group than in control group (P<0.01); there was no statistical significance of the positive incidence of duodenal papilla between axial T2WI FS and T1WI FS (P>0.05); axial T1WI FS (1.5 mm thickness) showed the duodenal papilla better then T1WI FS (3 mm thickness; P<0.05); the difference between coronal and axial T2WI HASTE (4 mm) was statistically significant (P<0.05); the reconstruction of oblique coronal TIWI FS showed the panorama of the duodenal papilla more clearly (P<0.05); compared to 1000 s/mm², the b value of 800 s/mm² showed better (P<0.05). Conclusion Combination of MR sequences including axial T1WI FS (thickness 1.5 mm), axial and coronal T2WI HASTE (4 mm), T1WI FS reconstruction oblique coronal position, b value of 800 s/mm² for duodenal papilla and ampullary region, as well as using hypotensive drugs and drinking water, serves as a preferred check for duodenal papilla.