Fig. 5. Sagittal view of a brain metastases treatment plan (a) parallel to the IOM line and across the frontal lobe (the top of the ROI), (b) parallel to the IOM line and across the corpus callosum (the middle of the ROI), and (c) parallel to the IOM line and across the cerebellum (the end of the ROI). The local gamma passing rates for various passing criteria were compared for 1%/1 mm and show (d–f) ED calibrations of 80 and 140 kVp and (g–i) ED calibrations of 120 and 140 kVp. Passing criteria: gamma ≤1. Green 90.0%–100.0%, yellow 75.0%–90.0%, and red 0.0%–75.0%. IOM, inferior orbitomeatal; ROI, circular region of interest; ED, electron density.
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