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Protons
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PBT is harder to use than X-ray therapy
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Full of uncertainties
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Proton beam therapy (PBT) can deliver
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Lower exit doses – ideal for children
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Possibly higher doses close to dose-limiting structures
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Used for skull base and spinal chordoma
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Dose plans ‘less tolerant’ of variation in shape or density
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Needs consideration of robustness
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Careful comparison is needed