5Aguirre DA, Behling CA, Alpert E, et al. Liver fibrosis: noninvasive diagnosis with double contrast material-enhanced MR imaging [J]. Radiology, 2006, 239:425-437.
6Muller MF, Prasad P, Siewert B, et al. Abdominal diffusion mapping with use of a whole body echo-planar system [J]. Radiology, 1994, 190(2): 475-478.