M Murphy1 *, R Li2 *, K Suzuki3 *, I El Naqa4 *, S Jiang5 *, (1) Virginia Commonwealth University, Richmond, VA, (2) University of California, San Diego, La Jolla, CA, (3) The University of Chicago, Chicago, IL, (4) Washington University in St. Louis, St. Louis, MO, (5) University of California, San Deigo, La Jolla, CA