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On-Board Imager (OBI) – confidence in tumor targeting

On-Board Imager (OBI) – confidence in tumor targeting

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 challenges
  • An easy to use and efficient system is paramount for IGRT to be a real clinical solution that can be implemented for all patients.
  • Versatility to enable standard protocols to be supported but also that individual patients needs can be supported to.
  • Image quality needs to be good enough to be able to make clinical decisions quickly and accurately before treatment delivery.
  • Acceptable dose.
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 of 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.
Automated 2D/2D matching process

The planning and delivery of tightly defined dose distributions in three dimensions is a challenge that has been solved. Yet aligning the treatment beam to the target volume remains a key challenge to improving outcomes because patients, tumors and normal tissues move. The OBI provides the tools to manage both interfraction motion (changes in position caused by day-to day set up conditions) and intrafraction motion (changes in position during a treatment session because of normal respiratory and organ motion).

Automated 3D/3D matching process

To minimize both types of motion, the OBI introduces pretreatment online imaging to the clinical process.

Managing interfraction motion with ease. Fast. Reliable. Automation.

The OBI identifies the patients position at the time of treatment so that small couch adjustments can position the patient optimally. The system has two modes of operation – radiographic repositioning using fast reliable automated tools for anatomical registration or radio opaque marker registration, and cone beam CT repositioning. The OBI is designed for convenience so that all types in the patient repositioning process can be performed remotely – saving time and simplifying the process.

Managing Intrafraction motion

Treatment adaptation

Tumors that move because of respiratory motion may be more effectively treated using the Real-time Position Management™ (RPM) system. Gating automatically turns the treatment beam on and off at intervals synchronised with the patient's respiratory pattern, effectively freezing the moving target.

Robotic Technology – geared to performance, accuracy and image quality

The OBI is mounted on the treatment machine via robotically controlled arms which operate along three axes of motion so that they can be positioned for the best possible view of the tumor. Positioning is all automated.

By using the robotic technology and control software to position the OBI and patient couch, the complete system offers the automation, speed, and flexibility needed to make IGRT treatment clinically practical for thousands of cancer patients. All functionality is supported in a fully integrated environment.

 

Contact Varian Oncology

Varian Oncology Headquarters
Tel: 1.650.424.5700
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