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. Author manuscript; available in PMC: 2015 Aug 1.
Published in final edited form as: Int J Radiat Oncol Biol Phys. 2014 Jul 8;89(5):1121–1128. doi: 10.1016/j.ijrobp.2014.04.051

Fig. 1.

Fig. 1

Schema of the different PTV strategies. Clinically, the GTV was delineated on exhale 4DCT. DIR of 4DCT allowed for propagation of the exhale contours into the inhale (2) or time-averaged position (3). Figure adapted from [24].