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Finite sized pencil beams (FSPB or beamlets)
Pre-integrated over a finite beam area. Reduces time for super-position, but requires
constant energy fluence over beamlet area.
1cm
2
U Jelen, et al (2005)
Phys Med Biol 50
, 1747-66.
Ostapiak, et al (1997)
Med Phys 24
, 743-50.
Mainly for fast calculations in IMRT optimization. However, the width of a beamlet
can not be larger than the resolution of the grid used for fluence optimization.
1.25MeV
SSD=80cm