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. 2016 Nov 28;90(1070):20160652. doi: 10.1259/bjr.20160652

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© 2016 The Authors. Published by the British Institute of Radiology

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Figure 5. — The calculated penumbrae using the treatment planning system in a water phantom with a dimension of 30 × 30 × 30 cm are shown. The field sizes are 4 × 4 cm and the source-to-surface distance is 100 cm. Penumbrae of 6- and 10-MV flattening filter-free (FFF) photon beams by a linear accelerator and Co-60 gamma ray by the ViewRay^™ system (ViewRay inc., Cleveland, OH) are shown with solid lines, dashed lines and dotted lines, respectively. Penumbrae at depths of 3 (a), 5 (b), 10 (c) and 15 cm (d) are shown.