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Effect of collimator angle depends on the IMRT delivery
▪
In step&shoot delivery: block the ‘central area’
▪
in d-MLC delivery:
leafs should be closed when travelling ‘across’ the central area
Elekta MLCi 90º versus Varian / Elekta MLCi2: 0º / 90º
or allow for ‘
move only segments
’
segment 1
segment x