The mean values of CNRinfarct/myocardium and CNRinfarct/blood were 14.5 5.9 and 4.0 4.6 , respectively , for gadobutrol and 13.9 6.1 and 0.9 4.5 , respectively , for gadobenate dimeglumine ( P = 0.69 and P = 0.02 , respectively ) .