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. 2019 Jan 22;9:7. doi: 10.3389/fonc.2019.00007

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Copyright © 2019 Li, Irmen, Liu, Shi, Alonso-Basanta, Zou, Teo, Metz and Dong.

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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(Left) MLC Design comparison of current dual-layer Halcyon MLC (brown) vs. 0.25 cm wide HD-120 MLC (Green) and 0.5 cm wide Millenium-120 MLC (Red) showing increased leaf thickness and rounding radius. (Right) Different between Halcyon MLC version 1 and version 2. Halcyon V2 enables the upper layer to be used for beam shaping, effectively producing 0.5 cm modulation resolution.