On-board Imaging


The Varian On-Board Imager® kV imaging system (OBI) is standard on the Trilogy linear accelerator and makes dynamic targeting IGRT more efficient and convenient.

Treat what you have planned – providing the ability to deliver more accurate treatment with confidence and repeatability.

Whether you want to image the patient daily or weekly OBI has the capability to define flexible imaging protocols that meet your needs.

The OBI kV imaging system delivers improved tumor targeting using high resolution, low dose digital imaging in the treatment room. Users can confidently manage patient and target movement- both before and during treatments. A choice of imaging modalities – 2D radiographic, fluoroscopic or 3D Cone beam CT imaging. The use of kV imaging means lower patient dose and better image quality than megavoltage imaging.

You need the best image information to help you make fast accurate decisions when comparing reference images to set up images prior to treatment – this information is what you base your decision on whether to continue to treat or make a change.

Clinical features
  • High quality means you can quickly see set up and anatomical differences, therefore enabling quick and accurate decisions before treatment.
  • Low dose imaging means that it is acceptable to do daily imaging if required.
  • Choice of imaging modalities that can be used whenever you need to using preset protocols or manual selection.
  • Easy-to-use user interface with automated comparison tools quickly show differences in patient positioning.
  • Automated extension and retraction of OBI hardware does not require operator intervention in the room.

The planning and delivery of tightly defined dose distributions in 3D is a challenge that has NOW been solved.