Volumetric modulated arc therapy (VMAT) is a novel radiation therapy technique that delivers the radiation dose continuously as the treatment machine rotates. This technique accurately shapes the radiation dose to the tumour while minimising the dose to organs surrounding the tumour.
VMAT involves the use of external radiation therapy beams which are directed in a series of arcs or angles by a rotating machine to allow for greater access to a cancerous tumour. The arc-shaped beams allow more difficult tumours, such as ones wrapped around organs and other important structures, to be targeted more precisely.
VMAT is a type of intensity-modulated radiation therapy (IMRT) in the way the radiation dose is continuously varied throughout your treatment. It is also known as Rapid Arc.