VMAT
Also written as: VMAT — Volumetric Modulated Arc Therapy
Volumetric Modulated Arc Therapy - a radiation therapy technique that delivers dose while rotating around the patient.
Full Definition
Volumetric Modulated Arc Therapy (VMAT) is an advanced form of intensity-modulated radiation therapy (IMRT) that delivers precise radiation doses while the linear accelerator rotates in an arc around the patient. This technique allows for complex dose distributions while reducing treatment time compared to conventional IMRT. VMAT is particularly valuable in treating irregularly shaped tumors while minimizing exposure to surrounding healthy tissues. The technique requires sophisticated treatment planning software to optimize beam angles, dose rates, and multileaf collimator positions throughout the arc.
Usage
Usage note: Always spell out on first use in patient-facing documents. Commonly confused with IMRT in treatment planning discussions.
In Context
- "The patient received VMAT to the prostate with excellent dose conformity to the target volume." — Treatment summary report
- "VMAT planning reduced the treatment time from 45 minutes to 12 minutes compared to conventional IMRT." — Physics treatment plan