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. 2014 Apr 20;9(6):1079–1086. doi: 10.1007/s11548-014-1001-4

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© The Author(s) 2014

Open AccessThis article is distributed under the terms of the Creative Commons Attribution License which permits any use, distribution, and reproduction in any medium, provided the original author(s) and the source are credited.

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Fig. 4 — Comparison of the normal beam-on time for treatment plans with $N = 3, 6, 9$ , and 12 targets respectively. The four SRS modalities are denoted as: $G K$ Gamma Knife Perfexion, $C K$ CyberKnife, $N O V$ Novalis, $F F F$ flattening filter free Truebeam