Volumetric Arc Therapy (VMAT) or RapidArc® Radiotherapy Technology is an advanced form of IMRT that delivers a precisely-sculpted 3D dose distribution with a 360-degree rotation of the gantry in a single or multi-arc treatment. Unlike conventional IMRT treatments, during which the machine must rotate several times around the patient or make repeated stops and starts to treat the tumor from a number of different angles, VMAT / RapidArc can deliver the dose to the entire tumor in a 360-degree rotation, typically in less than two minutes. RapidArc uses special software and an advanced linear accelerator from Varian to deliver IMRT treatments up to eight times faster than what was previously possible. The algorithm ensures treatment precision, helping to spare surrounding healthy tissue. RapidArc is made possible by software innovations that may be used with Varian manufactured treatment technology. RapidArc consists of two components: (1) treatment planning and (2) treatment delivery and is used for both radiotherapy and radiosurgery patients. Volumetric modulated arc therapy differs from existing techniques like helical IMRT or intensity-modulated arc therapy (IMAT) because it delivers dose to the whole volume, rather than slice by slice. And the treatment planning algorithm ensures the treatment precision, helping to minimize dose to surrounding healthy tissue.
RapidArc radiotherapy technology is a major advance from Varian Medical Systems that improves dose conformality while shortening treatment times. RapidArc is available for Varian linear accelerators including the Edge™, TrueBeam®, Trilogy® and many Clinac® linear accelerators. RapidArc uses a dynamic multileaf collimator (MLC), variable dose rate, and variable gantry speed to generate IMRT-quality dose distributions. RapidArc planning for Eclipse™ treatment planning system is fast, simple, and precise. With minimal learning curve, you can quickly plan for IMRT-quality treatments and deliver RapidArc treatments in just a fraction of the time.