17 consecutive patients ( mean age , 60.1 10.3 years ) with ST-segment elevation AMI underwent two randomized cardiac magnetic resonance studies ( exam intervals between 24 and 48h ) on a 1.5 T unit during the first week after the event using gadobenate dimeglumine ( Gd-BOPTA ) at the dose of 0.1 mmol/kg BW ( standard dose or SD group ) and 0.05 mmol/kg BW ( half dose or HD group ) .