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Monte Carlo dose calculation for a patient with distal esophageal cancer treated with 5,000 cGy in 25 fractions using pencil beam scanning proton beam therapy with two posterior oblique fields. (A) shows physical dose in cGy, (B) shows linear energy transfer (LET) in keV/μm, and (C) shows modeled biological dose incorporating physical dose and LET. Note that the high LET region is distal to the target in the heart.
