146 / 815
Volumes in ICRU78 and ICRU83
ICRU: “… the delineation of the PTV
margins should not be compromised”
“… subdivision of the PTV into regions
with different prescribed doses
(so-called PTV sub-volumes,
PTV
SV
) may be used”
The PTV might overlap an adjacent PRV or there might be
other reasons to subdivide the PTV
ICRU Report No.83 (2010)