2Erridge S C,Seppenwoolde Y,Muller S H,et al. Portal imaging to assess set-up errors, tumor motion and tumor shrinkage during conformal radiotherapy of non-small cell lung cancer[J]. Radiother Oncol, 2003,66:75-85.
3Shimizu S, Shirato H, Kagei K, et al. Impact of respiratory movement on the computed tomographic images of small lung tumors in the three-dimensional (3D)radiotherapy [J]. Int J Radiat Oncol Biol Phys,2000,46(5) : 1127- 1133.
4Liu F,Hu Y,Zhang Q,et al. Evaluation of deformable image registration and a motion model in CT images with limited features[J]. Phys Med Biol,2012,57 (9):2539- 2554.
5Kyriakou E, Mckenzie D R.Changes in lung tumor shape during respiration[J]. Phys bled Biol,2012,57 (4):919- 935.
6Bosmans G,Buijsen J,Dekker A,et al.An "in silico" clinical trial comparing free breathing, slow and respir- :ation correlated computed tomography in lung cancer pa-tients [J].Radiother 0ncol,2006,81(1):73-80.
7Hoisak J D, Sixel K E,Tirona R, et al. Correlation of lung tumor motion with external surrogate indicators of resp- iration[J ].Int J Radiat Oncol Biol Phys,2004,60(4):1298- 1306.
8Caldwell C B,Mah K,Skinner M ,et al. Can PET provide the 3D extent of tumor motion for individualized internal target volumes A phantom study of the limitations of CT and the promise of PET[J]. Int J Radiat Oncol Biol Ph- ys, 2003,55(5):1381-1393.
9Rao M, Wu J, Cao D, et al.Dosimetric impact of breath- ing motion in lung stereotactic body radiotherapy treat- ment using image-modulated radiotherapy and volume- tric modulated arc therapy[J]. Int J Radiat Oncol Biol Phys,2012,83 (2): e251-e256.
