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While x-rays deliver energy to all the tissues they travel through, proton beams deposit almost all of their energy on their target, with a low amount of radiation deposited in tissues from the surface of the skin to the front of the tumor, and almost no exit dose beyond the tumor. The physics of charged particles is such that there is always a lower entrance dose and, after a bragg peak at a depth specific to the particle, there is no exit dose. Unlike conventional radiation treatment, there is no exit dose, side effects are less significant and the tumor receives higher radiation. |
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