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What to do about a low D
90
?
Ask a few questions (and act if necessary):
1.
How “low” is it ?
–
If < 120 Gy , maybe something should be done …
–
If between 120 and 145 Gy, maybe
nothing
should be done
2.
Was it measured accurately ?
(image modalities, contouring, time frame, …)
3.
Where is the underdose ?
4.
Where is the tumour ?