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. Author manuscript; available in PMC: 2007 Oct 17.
Published in final edited form as: Med Phys. 2007 Mar;34(3):923–934. doi: 10.1118/1.2436972

Fig. 8.

Fig. 8

Standard deviation of the intrafraction dose variation due to organ motion presented for the sin(x), sin4(x), and sin6(x) motion, where X axis represent the ratio of delivery time to breathing period (DB). As an example, for breathing period of 4 s and dose rate of 500 MU/min, a DB value of 1 or 0.5 corresponds approximately to 33 or 17 MU intensity per beam segment.