volumetric modulated arc therapy
Also written as: VMAT — Volumetric Modulated Arc Therapy
Advanced radiation delivery technique where the treatment machine rotates around the patient while simultaneously modulating beam intensity.
Full Definition
Volumetric modulated arc therapy (VMAT) is a sophisticated form of intensity-modulated radiation therapy that delivers treatment while the linear accelerator gantry rotates in an arc around the patient. During delivery, the multileaf collimator leaves move dynamically to modulate the beam intensity, and the dose rate may vary continuously. This technique allows for highly conformal dose distributions with improved efficiency compared to static-field IMRT, typically reducing treatment times while maintaining plan quality.
Usage
Usage note: Distinguish from standard IMRT in technical documentation.
In Context
- "The prostate case was planned using volumetric modulated arc therapy to minimize rectal dose." — Treatment planning conference
- "VMAT delivery completed in 3 minutes compared to 15 minutes for step-and-shoot IMRT." — Technical efficiency report