639 / 1245
Modelling the MLC - 2
• Leaf-end shape is modelled
rounded
• Leaf end radius of curvature
: an adjustable (‘global’) parameter
• Leaf Offset:
an adjustable (‘global’) parameter (an estimate of the
increase in transmission through the leaf end relative to the
transmission from the full MLC thickness
the position of the leaf tip
projected to the plane of
the isocentre
position of the leaf
used for dose
calculations
Philips Pinnacle
3
,
Physics Reference Guide v9.10
Young et al, J App Clin Med Phys, 17(6), 2016