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Dose Calculation
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SBRT commonly includes extremely high-dose gradients near the boundary of
the target
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AAPM 101 recommendation on calculation grid size:
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Use an isotropic grid size of 2 mm or finer
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The use of grid sizes greater than 3 mm is discouraged
for SBRT
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Also commission
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Dose-Volume Histogram calculation => segmentation of volume
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Margin generation algorithm