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. Author manuscript; available in PMC: 2016 Mar 10.
Published in final edited form as: Int J Radiat Oncol Biol Phys. 2013 Dec 5;88(2):446–452. doi: 10.1016/j.ijrobp.2013.10.038

Fig. 2.

Fig. 2

A series of shell structures is created to account for shrinkages from the original to predicted residual planning target volume (PTV).