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Observation of Motion

Tumor motion varies widely (0-50 mm)

12 mm on average in CC direction

2 mm on average in AP and LR direction

The tumor position in the exhale phase is more stable than the tumor position in the

inhale phase

Seppenwoolde et al. Int. J. Radiation Oncology Biol. Phys., Vol. 53, No. 4, pp. 822–834, 2002

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