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Finite sized pencil beams - beamlets

Pre-integrated over a finite beam area. Reduces time for super-position, assumes

constant energy fluence over the beamlet area.

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. The beamlet sizes must match

the resolution of the fluence grid.

1cm

2

1.25MeV

SSD=80cm

concepts: