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Interplay – VMAT (+ FFF)
Ong CL et al, Int J Radiat Oncol Biol Phys. 2013 Jul 15;86(4):743-8
Dosimetric impact
of the interplay
effect for lung
SBRT with
flattening filter-free
beams and
RapidArc VMAT
2400MU/min - reduce treatment times –
< breathing cycles
fast IMRT of a mobile target under free breathing conditions
interplay effect (no averaging)
Over/Underdosage within the target region
during a single fraction, mitigated by using 2 to 3 fractions and 2
arcs per fraction