[1] Fujian Med Univ Union Hosp, Dept Radiol, Fuzhou 350001, Fujian, Peoples R China
[2] Fudan Univ, Shanghai Canc Ctr, Dept Radiol, 270 Dongan Rd, Shanghai 200023, Peoples R China
[3] Fudan Univ, Shanghai Med Coll, Dept Oncol, Shanghai 200032, Peoples R China
[4] Univ Oklahoma, Sch Elect & Comp Engn, Norman, OK 73019 USA