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. 2019 Mar 28;6:90. doi: 10.3389/fvets.2019.00090

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Copyright © 2019 Hansen and Kent.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Imaging and radiation planning for adaptive radiotherapy. (A) (Upper left) Original radiation planning CT image with PTV (red line and yellow-shaded region) contoured for a nasal carcinoma. (B) (Upper right) Mid-way through radiation treatment the tumor decreased in size. The shrinkage caused the right eye (blue shaded region) to fall within the original PTV (red line and yellow-shaded region). The green shaded area shows the region of the eye now overlapping with the PTV, and is also noted with a solid arrow.