[1] [1] K M Langen, D T L Jones. Organ motion and its management［J］. International Journal of Radiation Oncology, Biology, Physics, 2001, 50(1): 265-278.

[2] [2] Keall P J, Mageras G S, Balter J M, et al. The management of respiratory motion in radiation oncology report of AAPM Task Group 76.［J］. Medical Physics, 2006, 33(10): 3874-3900.

[3] [3] C T Smith, S Singha Roy, A Kanhere, et al. A mems based electronic incentive spirometer for measuring breathing pattern, velocity, and volume［J］. Journal of Surgical Research, 2011, 172(2): 339-339.

[4] [4] Liu S, Gao R X, Freedson P S. Non-invasive respiration and ventilation prediction using a single abdominal sensor belt［J］. Signal Processing in Medicine & Biology Symposium, IEEE, 2011: 1-5.

[5] [5] Loring S H, Townsend S R, Gallagher D C, et al. Expiratory abdominal rounding in acute dyspnea suggests congestive heart failure［J］. Lung, 2006, 184(6): 324-329.

[6] [6] Pickerd N, Williams E M, Kotecha S. Electromagnetic inductance plethysmography to measure tidal breathing in preterm and term infants［J］. Pediatric Pulmonology, 2013, 48(2): 160-166.

[7] [7] Gurney-Champion Oliver J, et al. Visibility and artifacts of gold fiducial markers used for image guided radiation therapy of pancreatic cancer on MRI［J］. Medical Physics, 2015, 42(5): 2638-2647.