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Axial (A), coronal (B) and sagittal (C) views of the isodose distribution with a 10% step gradient, and the dose volume histogram of the planning target volume (PTV) and spinal cord (D). A dose of 26 Gy was prescribed to the 75% isodose lines, divided into 4 fractions with the PTV coverage of 92.64%. The maximal spinal cord dose is 744.3 cGy, which is equal to a biologically effective dose (BED3) of 12.1 Gy.
