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Radiation treatment planning. (A) Representative beam set-up in the axial plane for four radiation treatment plans: Plan 1—360° arc; Plan 2—two angled beams; Plan 3—two angled beams, parallel opposed; Plan 4—anterior/posterior opposed (AP-PA). (B) The corresponding dose–volume histograms for each radiation treatment plan. R brain = right brain; L brain = left brain.
