TVD 2017

Target volumes – PRV

• Spinal cord, brainstem & optic nerves/chiasm perfect examples where a PRV may be helpful • serial tissue organisation • damage is clinically catastrophic

• Add a PRV, especially if high doses are planned • Almost no other OARs where a PRV is needed • PRV may be misleading for parallel organs

(This advice is more definitive than ICRU 83)