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