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Diagram of the reference directions. The red point denotes the Dmax. The green point denotes the center of the spinal canal. The outer red line denotes the contour of the PTV. The inner red line denotes the contour of the GTV. The green line denotes the contour of the spinal canal. The blue arrows denote the direction 1, 2, 3, and 4. Dmax Maximum dose; GTV: Gross tumor volume; PTV: Planned target volume.
