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Treatment plan for proton radiotherapy with a total dose of 84 GyE in 20 fractions. A: Isodose curves demonstrate 100% of the prescribed dose at the center and decreasing by 10% of the dose from the inside out; B: Dose-volume histogram of the target volume and the intestine shows that the tumor is entirely irradiated by almost 100% of the prescribed dose, and the intestine is hardly irradiated.
