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Comparison of treatment planning for particle vs. X-ray radiotherapy (RT). (A) Proton radiotherapy (PRT) and carbon-ion radiotherapy (CIRT) show a significant decrease in the average doses to the heart and lungs compared with (B) X-ray RT [mean heart dose, 13.95 gray equivalent to photon (GyE) vs. 16.40 Gy; mean lung dose, 9.12 GyE vs. 21.46 Gy].
