作者单位:Mem Sloan Kettering Canc Ctr, Dept Med Phys, New York, NY 10021 USA[1]Mem Sloan Kettering Canc Ctr, Dept Radiol, Mol Imaging & Therapy Serv, 1275 York Ave, New York, NY[2]Mem Sloan Kettering Canc Ctr, Dept Pediat, 1275 York Ave, New York, NY 10065 USA[3]