VMAT
Pronunciation: VEE-mat
Also written as: VMAT — Volumetric Modulated Arc Therapy
Volumetric Modulated Arc Therapy, an advanced radiation delivery technique using rotating treatment beams with continuously varying parameters.
Full Definition
VMAT (Volumetric Modulated Arc Therapy) is a sophisticated radiation therapy technique that delivers treatment while the linear accelerator gantry rotates around the patient in one or more arcs. Unlike conventional IMRT, VMAT continuously varies the dose rate, gantry speed, and multileaf collimator positions during delivery, allowing for highly conformal dose distributions with shorter treatment times. This technique is particularly advantageous for complex target volumes and when sparing multiple critical structures. Medical editors working with radiation oncology literature should understand that VMAT represents a specific subset of intensity-modulated radiation therapy with distinct technical and clinical advantages.
Usage
Usage note: Specific type of IMRT delivery, not synonymous with all intensity-modulated techniques.
In Context
- "The patient received VMAT to the prostate with excellent target coverage and organ sparing." — Treatment summary report
- "VMAT delivery reduced treatment time compared to conventional step-and-shoot IMRT." — Technical comparison study