ViewRay (MRIdian)
ViewRay makes MRIdian, the MR-linac that pairs a low-field MRI with a linear accelerator so tumours in the pancreas, liver and prostate can be watched and the beam gated while it treats; the original company went bankrupt in 2023 and the business continues under new ownership.
Overview
Founded in 2004 by physicist James Dempsey, ViewRay first sold a cobalt-based MR-guided system and then MRIdian Linac, which combines a split superconducting low-field MRI with a 6 MV linac and treats while imaging, gating the beam automatically when the target leaves its boundary. Washington University in St Louis, the University of Wisconsin, UCLA, Heidelberg and Amsterdam were among the early users, and the SMART trial of MR-guided stereotactic radiotherapy in pancreatic cancer used the platform. ViewRay Technologies filed for bankruptcy in 2023 and the MRIdian business was bought out and continues to support and sell the system as ViewRay Systems. OnCo links it to MR-guided adaptive radiotherapy.
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