There were significant differences between the two conversion methods for the following parameters : AUC60 ( area under the curve at 60 s , P < 0.001 ) , peak gadolinium concentration ( Cpeak , P < 0.001 ) , upslope ( P < 0.001 ) , Fp ( portal flow , P = 0.04 ) , total hepatic flow ( Ft , P = 0.007 ) , and MTT ( mean transit time , P < 0.001 ) .