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VMAT stands for Volumetric Modulated Arc Therapy. It is a type of radiation therapy used in the treatment of cancer. VMAT is an advanced form of intensity-modulated radiation therapy (IMRT) that delivers radiation beams in a continuous arc around the patient. This technique allows for more precise targeting of the tumor while minimizing radiation exposure to surrounding healthy tissues.

VMAT works by modulating the intensity of the radiation beams as they rotate around the patient, adjusting the dose delivery based on the shape and size of the tumor. This dynamic process helps to deliver higher doses of radiation to the tumor while sparing nearby healthy tissues, reducing the risk of side effects.

Overall, VMAT offers several advantages over conventional radiation therapy techniques, including shorter treatment times, improved dose conformity, and reduced radiation exposure to surrounding organs. It is commonly used in the treatment of various types of cancers, including prostate, lung, head and neck, and brain tumors.