How to construct a novel, non-invasive, accurate, and convenient method to achieve prediction of hepatic venous pressure gradient (HVPG) is an important general problem in the management of portal hypertension in cirrhosis. We plan to compare the ability of three demensional-magnetic resonance elastography (3D-MRE) to two demensional-magnetic resonance elastography (2D-MRE) to establish a risk stratification system and perform tailored management for portal hypertension in cirrhosis.