1. Clinical Imaging Physics Group; Department of Radiology; Duke University Medical Center; Durham NC 27705 USA
2. Clinical Imaging Physics Group; Carl E. Ravin Advanced Imaging Laboratories; Department of Radiology; Duke University Medical Center; Durham NC 27705 USA
3. Departments of Physics, Electrical and Computer Engineering, and Biomedical Engineering; Medical Physics Graduate Program; Duke University; Durham NC 27705 USA