1 Department of Imaging Physics, The University of Texas MD Anderson Cancer Center, 1400 Pressler St., Unit 1352, Houston, TX 77030-3722. Electronic address: kyle.jones@mdanderson.org.
2 Department of Radiology, University of North Carolina, Chapel Hill, North Carolina.
3 Division of Interventional Radiology, Northwestern University Feinberg School of Medicine, Chicago, Illinois.
4 Department of Radiology, University of Texas Medical Branch, Galveston, Texas.
5 Department of Radiology, Stratton Medical Center, Albany, New York.