Proton therapy is a precise and effective treatment for tumors in sensitive areas of the body, such as the brain or the eyes, with the advantage that it spares healthy tissue. In this procedure, protons (positively charged particles) are strongly accelerated and directed with precision into the tumor tissue, which is destroyed in the process. However, this efficient method of treatment has so far required large accelerators, which is why it is only available in major treatment centers.
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Source: Phys.org