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Measured and calculated dose differences for five spine plans as a function of DLG (g) for 6X, 6XFFF, and 10XFFF; e = (DIC − DTPS)/DTPS × 100; DIC – measured dose using ion chamber and DTPS – calculated dose in TPS. Each data point is the mean error of five measurements at given DLG. All three R2 values were equal to 1.0.
