Intermediate
Technical
IVT
beam modulation
The process of varying radiation beam intensity across the treatment field to achieve desired dose distribution.
Full Definition
Beam modulation refers to techniques that modify the intensity of radiation across different portions of the treatment beam to create complex dose distributions. This can be achieved through various methods including multileaf collimator movement (IMRT), volumetric arc techniques (VMAT), or compensating filters. Beam modulation allows for highly conformal dose delivery while sparing nearby critical structures. The degree of modulation is often quantified by modulation complexity scores.
In Context
- "Increased beam modulation was necessary to achieve adequate organ sparing." — Treatment planning note
- "The physicist reviewed beam modulation complexity before plan approval." — Plan review documentation
Also known as
intensity modulation
fluence modulation
Contrasted with
uniform beam
open beam
Don't confuse with
beam steering
beam shaping