Varian Medical Systems has installed its On Board Imager system for image guided radiation therapy (IGRT) at the Hirslanden Klinik in Aarau, Switzerland. It is the second European install of the technology to date.
Varian's On-Board Imager is a digital imaging device mounted on a facility's cancer treatment machine via robotically controlled arms that operate along three axes of motion. The device produces high-resolution images of the tumour, and it can also track tumour motion to provide doctors with a clear indication of exactly how a tumour will move during treatment due to normal breathing and other physiological processes.
In addition to the On-Board Imager, the system incorporates Varian's RPM Respiratory Gating system, which tracks tumor motion and turns the treatment beam on and off as the tumor moves in and out of range. By "gating" the treatment beam, doctors are able to deliver a more precise dose to the tumor, and avoid more of the surrounding healthy tissues.