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Target volumes – PRV
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Spinal cord, brainstem & optic nerves/chiasm perfect examples
where a PRV may be helpful
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serial tissue organisation
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damage is clinically catastrophic
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Add a PRV, especially if high doses are planned
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Almost no other OARs where a PRV is needed
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PRV may be misleading for parallel organs
(This advice is more definitive than ICRU 83)