bixel

A small photon intensity element used to subdivide an intensity-modulated beam for intensity distribution optimisation or dose calculations treatment planning

beam·let

(bēm'lĕt)

Also referred to as a bixel; a small photon intensity element used to subdivide an IMRT beam for the purpose of treatment calculation for radiation therapy.
Synonym(s): bixel.

[beam + -let, dim. suffix]

bixel

(bĭks′ĕl) [Fr. b(eam) + (pi)xel]

A beam element or ray in radiation oncology.