1. Department of Radiology and Imaging Sciences; Emory University School of Medicine; Atlanta GA 30329 USA
2. The Wallace H. Coulter Department of Biomedical Engineering; Emory University and Georgia Institute of Technology; Atlanta GA 30329 USA
3. Winship Cancer Institute of Emory University; Atlanta GA 30329 USA
4. Department of Mathematics and Computer Science; Emory College of Emory University; Atlanta GA 30329 USA