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. Author manuscript; available in PMC: 2010 Jul 1.
Published in final edited form as: Int J Radiat Oncol Biol Phys. 2009 Jul 1;74(3):859–867. doi: 10.1016/j.ijrobp.2009.02.012

Fig. 4.

Fig. 4

Offsets of kV and MV imager as a function of gantry angle with respect to the MV beam isocenter, along with sinusoidal fits. SID stands for source-to-imager distance.