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The resulting penumbra is not only dependent on the leaf edges,

but also on the location of the MLC in the treatment head.

Huq

et al

[5]

46 cm

@

d

max

Siemens 160 MLC

53.3 cm

37.9 cm

37.3 cm

(F)

(not Agility)

To

geometric penumbra

Numbers equal

SCD (outer edge)

MLC penumbras (motion direction)

Dublin 2018