Real-time MRI guided percutaneous transthoracic left ventricular access and closure - Slack Michael C; Schenke William H; Wu Vincent; Bell Jamie A; Kocaturk Ozgur; Faranesh Anthony Z; Ratnayaka Kanishka; Saikus Christina E; Barbash Israel M; Lederman Robert J (Journal of Cardiovascular Magnetic Resonance, 2011)