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Geometric model of proton therapy unit and the voxelized phantom oriented for the superior spinal proton field. The beam delivery system includes a vacuum window (A), a beam profile monitor (B), a range modulator wheel (C), a second scatterer (D), a range shifter assembly (E), backup and primary monitors (F), the snout (G), the range compensator (H), the treatment couch (I), and the patient (J).
