1. University of Wisconsin-Madison, Department of Medical Physics, 1111 Highland Avenue, Madison, Wisconsin 53705, United States
2. University of Wisconsin-Madison, Department of Medicine, 600 Highland Avenue, Madison, Wisconsin 53792, United States
3. University of Wisconsin-Madison, Department of Medical Physics, 1111 Highland Avenue, Madison, Wisconsin 53705, United StatesbUniversity of Wisconsin-Madison, Department of Medicine, 600 Highland Avenue, Madison, Wisconsin 53792, United States
4. Triple Ring Technologies, Inc., 39655 Eureka Drive, Newark, California 94560, United States