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Target volumes – PRV
•
Spinal cord & optic nerves/chiasm perfect examples where a PRV
may be helpful
•
serial tissue organisation
•
damage is clinically catastrophic
Add PRV i ll if hi h d
l
d
•
a
, espec a y g oses are p anne
•
Almost no other OARs where a PRV is needed
•
PRV may be misleading for parallel organs
(This advice is more definitive than ICRU 83)