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. Author manuscript; available in PMC: 2019 Jun 1.
Published in final edited form as: Int J Radiat Oncol Biol Phys. 2018 Feb 14;101(2):479–489. doi: 10.1016/j.ijrobp.2018.02.009

Figure 1.

Figure 1

Comparison of nominal dose distributions and DVH indices from large-spot and small-spot machines. A representative dose distribution comparison on one CT slice between (a) using large-spot and (b) using small-spot machine illustrated that small-spot machine decreased dose to total lung and spinal cord. The red arrows indicate beam directions. Comparison of the averaged DVH indices of different structures for ten lung cancer cases including (c) total lung V5Gy[RBE] and V20Gy[RBE], esophagus V60Gy[RBE], heart V50Gy[RBE], (d) ITV D95%, D5%- D95%, D2cc, total lung Dmean, esophagus D33%, and spinal cord Dmax, Comparison of nominal plan quality for 10 patients including: (e) esophagus Dmean, (f) heart D33%, and (g) heart Dmean. Numbers at the top of the columns in (c) and (d) were p values from Wilcoxon signed-rank test. The indices with significant difference were labeled with the bold font. Abbreviations: RBE = relative biological effectiveness.