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. 2014 Jun 18;55(5):1015–1020. doi: 10.1093/jrr/rru042

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© The Author 2014. Published by Oxford University Press on behalf of The Japan Radiation Research Society and Japanese Society for Radiation Oncology.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.

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Fig. 7. — Plots of Paddick's gradient index (PGI) of the 14-mets plan as a function of the target volume, where D₉₅ was prescribed for each of the PTVs (marked with filled circles) and to the entire PTVs (marked with X's). Again, PGIs for two targets were significantly lower than others (marked with open circle), possibly resulting from an exceptionally short distance between the two targets (1 cm).