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Figure 4. Advanced Radiotherapy Modality Comparison. IMRT and proton therapy plans for a 32-year-old with stage IIA thymoma, WHO type B2 s/p thymectomy showing an 11.2 cm tumor with close margins (< 1 mm) and invasion into the mediastinal fat treated with adjuvant radiation therapy to 50.4/1.8 Gy. Radiation dose distribution and beam arrangements for proton (left) and VMAT IMRT (right) comparison plans depicting dose above 20% of the prescription (A) and 50% of the prescription (B). Dose-volume histogram (C) and key organ at risk tabular summary (D) between proton and photon plans.