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. 2020 Apr 23;10:598. doi: 10.3389/fonc.2020.00598

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Copyright © 2020 Zhang, Peng, Ding, Zhu, Liu, Chen, Sun, Zhou and Deng.

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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Dose distributions in the target volume in the coronal plane of the four plans in a patient with nasopharyngeal carcinoma (NPC). In these four plans, the 70-Gy dose cloud covers the planning target volume (PTV)_nx (green line), the 66-Gy dose cloud covers the PTV_nd (purple line), the 60-Gy dose cloud covers the PTV₁ (cyan line), and the 54-Gy dose cloud covers the PTV₂ (orange line).