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Fig. 1D. —Three-dimensional (3D) conformal radiation therapy treatment-planning images. Note that maximal radiation dose (green area) is limited to area immediately around tumor. As distance from maximal area of exposure (red, orange, yellow, indigo, pink, and dark orange lines) increases, radiation dose to surrounding normal lung decreases. Radiation dose to surrounding lung is asymmetric because multiple angled beams were used to deliver maximal dose to tumor. Sagittal image shows isodose curves.