| 1. | MA C M, JIANG S B, PAWLICKI T, et al. A quality assurance phantom for IMRT dose verification[J]. Phys Med Biol, 2003, 48(5):561-572. | 
				                                                        
				                                                            
				                                                                | 2. | YOO S, YIN F F. Dosimetric feasibility of cone-beam CT-based treatment planning compared to CT-based treatment planning[J]. Int J Radiat Oncol Biol Phys, 2006, 66(5):1553-1561. | 
				                                                        
				                                                            
				                                                                | 3. | OUYANG L, SOLBERG T, WANG J. Noise reduction in low-dose cone beam CT by incorporating prior volumetric image information[J]. Med Phys, 2012, 39(5):2569-2577. | 
				                                                        
				                                                            
				                                                                | 4. | PETER J, JASZCZAK R, COLEMAN R. Composite quadric-based object model for SPECT Monte-Carlo simulation[C]//45th Annual Meeting of the Society of Nuclear Medicine, Toronto:1998:121P. | 
				                                                        
				                                                            
				                                                                | 5. | PETER J, GILLAND D R, JASZCZAK R J, et al. Four-dimensional superquadric-based cardiac phantom for Monte Carlo simulation of radiological imaging systems[J]. IEEE Trans Nucl Sci, 1999, 46(6):2211-2217. | 
				                                                        
				                                                            
				                                                                | 6. | SEGARS W P, XCAT T B. The evolution of 4-D computerized phantoms for imaging research[J]. Proceedings of the IEEE, 2009, 97(12):1954-1968. | 
				                                                        
				                                                            
				                                                                | 7. | SEGARS W P, STURGEON G, MENDONCA S, et al. 4D XCAT phantom for multimodality imaging research[J]. Med Phys, 2010, 37(9):4902-4915. | 
				                                                        
				                                                            
				                                                                | 8. | S?HN M, SOBOTTA B, ALBER M. Dosimetric treatment course simulation based on a statistical model of deformable organ motion[J]. Phys Med Biol, 2012, 57(12):3693-3709. | 
				                                                        
				                                                            
				                                                                | 9. | ROLAND T, HALES R, MCNUTT T, et al. A method for deriving a 4D-interpolated balanced planning target for mobile tumor radiotherapy[J]. Med Phys, 2012, 39(1):195-205. | 
				                                                        
				                                                            
				                                                                | 10. | CAON M. Voxel-based computational models of real human anatomy:a review[J]. Radiat Environ Biophys, 2004, 42(4):229-235. | 
				                                                        
				                                                            
				                                                                | 11. | PETER J, TORNAI M P, JASZCZEK R J. Analytical versus voxelized phantom representation for Monte Carlo simulation in radiological imaging[J]. IEEE Trans Med Imaging, 2000, 19(5):556-564. | 
				                                                        
				                                                            
				                                                                | 12. | ELEKTA C M S. Xio DICOM conformance statement release 4.61[EB/OL] (2010-07-10)[2012-06-12].http://www.elekta.com/healthcare-professionals/products/elekta-software/DICOM-conformance-statements.html. | 
				                                                        
				                                                            
				                                                                | 13. | Python Software Foundation. Python v 2.7.3 documentation[EB/OL](2011-06-12)[2012-05-20].http://docs.python.org/2/library/index.html. | 
				                                                        
				                                                            
				                                                                | 14. | THOMAS S J. Relative electron density calibration of CT scanners for radiotherapy treatment planning[J]. Br J Radiol, 1999, 72(860):781-786. | 
				                                                        
				                                                            
				                                                                | 15. | KHAN, FAIZ M. Treatment planning in radiation oncology[M]. 2nd ed. New York:Lippincott Williams & Wilkins, 2007:64-78. | 
				                                                        
				                                                            
				                                                                | 16. | International Atomic Energy Agency. Commissioning of radiotherapy treatment planning systems:testing for typical external beam treatment techniques,IAEA TECDOC 1583[R]. Vienna:IAEA, 2008:35-42. |