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Treatment beams arrangement in sagittal (a) and axial (b) planes for patient #7. The shaded red region is the primary PTV, blue is secondary PTV and green is the spinal cord. There are five treatment beams in total, four are coplanar and one is noncoplanar (couch rotated 90°). Only the noncoplanar beam propagates through the spinal cord. The rest of the beams are superior to the cord and situated in the same axial planes as PTV.
