[1] Rhein Westfal TH Aachen, Dept Diagnost Radiol, Aachen, Germany
[2] Rhein Westfal TH Aachen, Med Clin 1, Aachen, Germany
[3] Beth Israel Deaconess Med Ctr, Dept Med, Div Cardiovasc, Boston, MA 02215 USA
[4] Harvard Univ, Sch Med, Boston, MA USA
[5] Philips Med Syst, Best, Netherlands