High-quality soft-tissue imaging for accurate patient positioning

At the heart of the ViewRay™ system is a custom-designed MRI unit that can capture volumetric soft-tissue images in just a few seconds. MRI is the clinically preferred method of imaging soft tissue: unlike CT imaging, MRI provides high-contrast images without exposing the patient to unnecessary ionizing radiation. 

Volumetric MR imaging can be used for planning and daily positioning as well as for precision targeting during treatment. Prior to treatment, MRI assists in accurate patient setups without interrupting conventional workflows. Volumetric pretreatment images deliver:

  • High soft-tissue contrast. Positioning accuracy requires high-quality images, and ViewRay’s MRI subsystem delivers excellent soft-tissue contrast.
  • High spatial resolution. Images of a moving tumor require high spatial fidelity. Volumetric imaging shows exactly where the tumor is in space, relative to other structures.
  • Sharper penumbra. The ViewRay system’s double-focused multileaf collimator (MLC) is designed to sharpen field edges, producing penumbra comparable to conventional accelerators, so clinicians can treat with greater confidence.
  • High throughput. Pretreatment imaging fits into a conventional timeslot, similar to the timeslot required for cone-beam CTs. Images are reconstructed at the same time they’re acquired, so there’s no delay.

Once a pretreatment image is captured, the ViewRay system can rigidly register the image of the moment with the treatment planning image. In addition, the system offers extremely fast deformable registration capabilities, enabling accurate positioning—all within the typical workflow.

Resources

MRI and Soft-Tissue Imaging Brief [PDF]




pretreatment imaging

With the ViewRay system, MR imaging can be used for planning and daily positioning as well as for precision targeting during treatment.