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. 2020 Mar 25;21(5):38–47. doi: 10.1002/acm2.12851

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© 2020 The Authors. Journal of Applied Clinical Medical Physics published by Wiley Periodicals, Inc. on behalf of American Association of Physicists in Medicine.

This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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Fig. 7 — Population analysis: Collimator usage. Collimation usage distribution from 5 months before to 6 months after TPS upgrade. a) and b) show the distribution between fixed cone, Iris, and MLC collimation usage for treatment plans utilizing 6D Skull and Xsight Spine tracking, respectively. The absolute numbers are shown in c) with the introduction of the VOLO optimizer an increase in MLC collimation usage was seen. For plans generated with Xsight Spine tracking, the MLC usage was higher than Iris usage at five and six months after the TPS upgrade.