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Inverse Planning - Beam Modeling
• Dosimetric accuracy of the IMRT plan delivery
depends on the accurate representation of
✓
Beam Penumbra – MLC / collimator jaws.
✓
transmission and scattering properties of MLC leaves.
✓
Output factor for small field size.
✓
Accuracy of dose calculation algorithm.
✓
Approximations of leaf sequence generation algorithm.
✓
Leaf positioning accuracy.
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