From the *Department of Radiology, University of Michigan, Ann Arbor, Michigan;
the †Department of Radiology, German Cancer Research Center, Heidelberg, Germany;
the ‡Department of Surgery, University of Michigan, Ann Arbor, Michigan;
and §General Electric Medical Systems, Milwaukee, Wisconsin.
This work was partially supported by a grant from the Deutsche Forschungsgemeinschaft (DFG).
Reprint requests: Stefan O. Schoenberg, MD, Deutsches Krebsforschungszentrum, FSP Radiologie E0103, Im Neuenheimer Feld 280, 69120 Heidelberg, Germany.
Received September 1, 2000, and accepted for publication, after revision, February 13, 2001.