参考：

[1] http://radiologykey.com/the-cross-sectional-anatomy-of-the-liver-and-normal-variations/

[2]http://www.radiologyassistant.nl/en/p4375bb8dc241d/anatomy-of-the-liver-segments.html

[3] Altun E. Liver Imaging: MRI with CT Correlation[J]. 2015.