Volumetric Modulated Radiotherapy (VMAT or Rapidarc)
VMAT / RapidArc is an advanced form of IMRT that was introduced in 2007. VMAT, or volumetric arc therapy, uses special software and an advanced linear accelerator to deliver IMRT treatments up to eight times faster than what was previously possible. 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 single rotation — in less than two minutes.
Patient Benefits from VMAT Rapidarc
- Minimizes exposure to surrounding healthy tissues
- The radiation is delivered only to the intended area resulting in fewer side effects
- Less Treatment Time
- VMAT cuts radiation treatment times by one-half to two-thirds through delivering a higher and more targeted dose to cancerous tumors, without compromising patient safety
- Greater patient comfort and stillness
- VMAT benefits patients who find it difficult to lie completely still for the typical 30 or more minutes of treatment time
How VMAT Works?
Right on Target
VMAT precisely conforms the radiation to the cancer. The radiation is delivered only to the intended area, allowing the radiation oncologist to spare more surrounding healthy tissue and better avoid nearby critical anatomy. To further ensure accuracy, 3D imaging at ultra-low doses allows the radiation oncologist and technologists to quickly and safely verify tumor position prior to treatment. Sophisticated monitoring tools further enhance precision by monitoring your treatment in real-time to ensure that the dose is delivered as precisely as your radiation oncologist prescribes it.
Single or Multiple Arc Delivery:
During VMAT treatment, the radiation machine rotates around the patient in single or a series of arcs delivering focused beams of radiation to the cancer. The shape and intensity of the radiation beams changes as the machine rotates. These features mean that, in effect, the beam of radiation can come from an infinite number of angles, thereby reducing the dose of radiation to normal tissue while increasing the dose to the cancer. The arc-based delivery also allows the radiation
Oncologist to treat tumors that are adjacent to critical structures in the body, such as a tumor that may be wrapped around an organ.