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Target volumes – overlaps
•
There are always occasions when the PTV and OARs/PRVs overlap
•
What is the best strategy?
•
The planning concept has changed between ICRU 62 and 83
•
In fact it changed completely in ICRU 83
•
ICRU 62 – edit PTV (even CTV)
– fine for CRT
•
ICRU 83 –
do not
edit
– better for IMRT