TÂ Simon1,2 *, CÂ Fox3 , WÂ Simon2 , JÂ Li4 , JÂ Palta4 , CÂ Liu4 , (1)Â University of Florida, Dpt. of Nuclear and Radiological Engineering, Gainesville, FL, (2)Â Sun Nuclear Corp, Melbourne, FL, (3) Tulane University, Dpt. of Radiation Oncology, New Orleans, LA, (4)Â University of Florida, Dpt. of Radiation Oncology, Gainesville, FL