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•
The algorithm is based on progressive beam angle sampling to
optimize a large number of apertures using direct aperture
optimization (coarse-to-fine scheme)
•
starts with a small number of beams and large angular spacing, and
gradually inserts new beam angles to be optimized
•
Geometric connectivity is facilitated by initializing the shapes of new
apertures with shape interpolation between its neighbors and by
constraining maximum leaf travel near the end of the optimization
process
VMAT
–
Plan optimization
Otto K et al. Med Phys 2008