4VAN S?RNSEN DE KOSTE JR,DE BOER HC,SCHUCHHARD-SCHlPPER RH,et al.Procedures for high precision setup verification and correction of lung eancer patients using CT-simulation and digitally reconstructed radiographs(DRR)[J].Int J Radiat Oncol Biol Phys,2003,55(3):804-810.
5JOHN RZ,RAJAT K,RICHARD W,et al.Implication of CT table say on geometrical accuracy during virtual simulation[J].Medical Dosimetry,2007,32(4):233-236.