What are the tolerances for OAR
Lungs
Heart:
Spine:
Wedge, why do we use ?
To create an angular change in the isodose line.
What are the typical number of MU for this type of plan
MU
Which task group is that IMRT commissioning
TG IMRT 119
Why do we do IMRT QA
Modeling of leaf is not always accurate we want to double check
And also before the connection between the planning system and the treatment unit could failed, dicom converted wrong or corrupted. So patient would be treated with all MLC open.
How many leaf in a Varian
20 leafs to 80 ?
What is the leaf transmission
3-4%
What is the leaf interleaf transmission
3%
What is the transmission through jaws
Less than 1%, 3 ordre de grandeur less.
Contraint for lungs
V20<70%
V5<38%
Dose contrainst to heart
Mean dose is 20 Gy
