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Target volumes – PRV
•
The use of a PRV around an Organ at Risk is relevant for OARs
whose damage is especially dangerous
•
This applies to organs where loss of a
small
amount of tissue
would produce a
severe
clinical manifestation
•
A PRV is relevant for an OAR with serial organisation (almost
exclusively)
•
Spinal cord
•
Brain stem
•
Optic pathway
•
A PRV is
not
the same as a plan optimising volume