Quantitative analysis of LGE were performed by measuring signal intensity ( SI ) , signal-to-noise ratio ( SNR ) in the infarcted myocardium ( IM ) , non-infarcted myocardium ( N-IM ) and left ventricular cavity ( LVC ) in images acquired at 1 , 3 , 5 , 10 , 15 and 20 min after administration of Gd-BOPTA using both contrast media protocol .