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IMRT – the tongue and groove effects
The ‘tongue-and-groove’ effect may potentially be of
significance as
under-dosage
occurs
between two
adjacent leaf pairs
due to the fact that the region in
between is always covered by the tongue, or the
groove or both.
Tongue&Groove
Effects MLC
97 MU*
97 MU*
100 MU
=
Nominal
leaf edge
*3% leakage through MLC