RapidArc™ Radiation Therapy
RapidArc™ Radiotherapy Technology
RapidArc™ radiotherapy technology from Varian Medical Systems is a new approach to image-guided, intensity-modulated radiation therapy (IG-IMRT) that delivers precise treatments in shorter times than conventional IMRT.
RapidArc represents a major medical advance and is more comfortable for patients because they spend less time in their daily treatments. A fast, precise RapidArc treatment takes less than two minutes. Patients can be in and out of treatment quickly and return to their daily routine.
RapidArc rotates 360 degrees around the patient, enabling the very small beams with varying intensity to be aimed at the tumor from multiple angles. Unlike helical IMRT treatments or other forms of radiation therapy, with RapidArc the radiation treatment being delivered to the patient can be modulated continuously throughout treatment. This means that higher doses of radiation are delivered to hit the tumor harder, and less radiation is delivered to surrounding healthy tissue.
RapidArc treatments are delivered using either a Clinac® or a Trilogy® linear accelerator from Varian Medical Systems outfitted with imaging capabilities. The RapidArc imaging capabilities let the clinician see the location of the tumor in three dimensions before treatment. If the cancer has moved due to physical changes, treatment can be adjusted so the patient receives a precise treatment. This treatment platform is the most widely used and reliable platform available. Over 75 percent of the leading U.S. hospitals and clinics use Varian technology.**1. Data based on the 2006 edition of “America’s Best Hospitals” from U.S. News & World Report.
How It Works
RapidArc™ radiotherapy technology from Varian Medical Systems delivers treatments using either a Clinac® or a Trilogy® linear accelerator, outfitted with an On-Board Imager® kV imaging system for using images to guide patient placement and treatment delivery. The linear accelerator rotates around the patient to deliver radiation treatments from nearly any angle. During a RapidArc treatment, radiation is shaped and reshaped as it is delivered continuously from virtually every angle in a 360-degree revolution around the patient.
Like other forms of radiation therapy, RapidArc treatments are planned using sophisticated computer programs that analyze diagnostic image data and calculate the best way of delivering the radiation dose to minimize impact on healthy tissues for each patient.
Immediately prior to treatment, the exact location, size, and shape of the patient’s tumor is visually observed through a simple two-minute imaging procedure using the machine’s On-Board Imager.
After imaging is completed, the images are reviewed by the therapist and the patient’s position can be adjusted so that an accurate treatment can be delivered. The patient does not need to move off the treatment couch for this process—all adjustments are made automatically by the treatment couch.
A RapidArc radiotherapy treatment is delivered quickly—in less than two minutes and with just one turn of the machine around the patient. RapidArc shapes and modulates a highly focused treatment beam so that it targets the tumor precisely, sparing surrounding healthy tissues. It treats the entire tumor with pinpoint accuracy and is easier on the patient, who does not have to hold still for long periods of time.
During a RapidArc treatment, the treatment beam is continually shaped by a multileaf collimator (MLC), a device with 120 computer-controlled mechanical “leaves” or “fingers” that move to create apertures of different shapes and sizes.
RapidArc™ radiotherapy technology from Varian Medical Systems represents a new revolution in cancer care. RapidArc enables your clinician to treat some types of cancer with great precision in less than two minutes.
- RapidArc is delivered with a medical linear accelerator, which is a large machine that generates high-powered X-rays and rotates around you as you lie on a treatment couch, delivering the beams from many angles. With RapidArc, the entire treatment is completed with a single rotation of the machine.
- RapidArc is a new approach to delivering image-guided, intensity-modulated radiation therapy (IG-IMRT). Image guidance improves tumor targeting, and IMRT shapes the radiation dose so that it conforms closely to the three-dimensional shape of the tumor. That means more radiation is delivered to the tumor and less to surrounding healthy tissues.
- The treatments are fast. That makes it easier on you—you don’t have to hold still for long, and you’re in and out in a matter of minutes each day. With RapidArc, IMRT treatments that typically require at least 10 minutes can be completed in less than 2 minutes.
- A RapidArc radiotherapy system incorporates technology that makes it possible for your treatment team to position you for treatment with sub-millimeter accuracy. An On-Board Imager® kV imaging system mounted on the treatment machine provides high-resolution X-ray images of the targeted area just before each daily treatment.