Helical CT Imaging Accurately Guides Radiation Therapy

A cutting-edge imaging solution produces high quality computerized tomography (CT) scans to enhance the versatility and efficiency of radiation therapy (RT) procedures.

The Accuray (Sunnyvale, CA) ClearRT Imaging Solution is a helical kVCT system that provides fan-beam capabilities at both kV and MV wavelengths. The large transverse field of view and continuous scan length enable rapid acquisition and facilitate patient setup and registration, including for patients with metal implants, which is a contraindication for alternative magnetic resonance (MR) imaging. The system offers both excellent uniformity and low noise across the entire scanned image, with improved soft tissue visualization and spatial resolution.


The ClearRT imaging solution integrates seamlessly into the Accuray Radixact System, delivering imaging capabilities comparable to conventional linear accelerator systems that rely on cone-beam CT (CBCT) imaging. It leverages the same 5-step delivery workflow as the Radixact System. Additionally, ClearRT helical kVCT images will be available within the Accuray PreciseART automated dose trending tool for clinicians to evaluate if plan adaptation would be beneficial, enabling personalized patient care.

“ClearRT integrates with other Accuray-only applications on the Radixact System, making it possible for providers to offer a new level of precision and accuracy in the treatment of the simplest to the most complex pathologies,” said Suzanne Winter, senior vice president of R&D at Accuray. “Our continuing innovation on the Radixact System is designed to leverage its 360-degree, helical delivery platform to facilitate hypofractionated and ultra-hypofractionated treatments that support our customers' efforts to maintain the highest standard of care for their community.”

The Radixact System is an image guided, intensity modulated radiation therapy (IG-IMRT) system with a unique ultra-fast binary multi-leaf collimator (MLC) and a continuous 360 degree ring gantry with low-dose helical fan beam technology revolving at 10 RPM. Using the refined x-ray beamline and integrated imaging solution enables clinicians to deliver highly accurate dose distributions that conform precisely to the shape of the patient’s tumor and minimize RT dose to normal, healthy tissue.