Millennium MLC constraints
Earner Benjamin (ROYAL FREE LONDON NHS FOUNDATION TRUST)
We have Varian millennium 120-leaf MLC banks fitted in our linacs and I'm in the process of checking the beam model MLC limitations. The sample Varian 2100 machine that comes with Pinnacle also has a 120 leaf MLC with the following leaf constraints:
Maximum tip difference from jaw: 14cm
Dynamic Leaf gap: 0.05cm
Static leaf gap: 0cm
Maximum tip to tip difference: 14.5cm
Max/min leaf/jaw overlap: 0.5cm
Looking at the Varian millennium 120-leaf specifications (taken from the systems and maintenance guide) the following parameters are given:
Maximum leaf extension beyond most retracted leaf: 15cm
Leaf effective shielding length: 15cm
I would like to know why these parameters aren't used for the tip to tip difference, are the default Pinnacle constraints overly cautious? Or I am I missing something?
If anyone has constraints for a Varian millennium 120-leaf bank they would be willing to share that would be very useful.
Many thanks,
Ben
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Grégory Bolard
Hello,
We have set 14.9 cm due to possible rounding issues on jaw values (Allow Jaw Motion option in IMRT optimization).
The other values seem ok.
Greg
Genolier, Switzerland
> Message du 10/10/12 12:29
> De : "Earner Benjamin (ROYAL FREE LONDON NHS FOUNDATION TRUST)"
> A : "pinnacl...@googlegroups.com"
> Copie à :
> Objet : [p3rtp] Millennium MLC constraints
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Weber, Michael F.
I wonder if the 2100 machine model is using the old Mark MLC and not the millennium. If memory serves me correct the Mark MLC had a tip difference of 14cm.
We use 15cm in our clinic, static gap = 0cm and dynamic = .05cm.
Michael Weber, MS, DABR
Medical Physicists and RSO
Park Nicollet Methodist Hospital
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