Radiation oncology firm Varian Medical Systems said Moinhos de Vento Hospital is the first cancer center in Brazil to begin using its Calypso system.
The system was used with a Varian TrueBeam medical linear accelerator to treat a prostate cancer patient on January 10, Varian said. Calypso can detect slight movements of a tumor, enabling it to be targeted accurately with the treatment beam.
The Calypso beacon system implants transponders into the tumor that emit nonionizing electromagnetic signals; these signals are tracked in real-time and used to keep a treatment beam on target.
![A 53-year-old patient (patient number four) with a recurrent pituitary adenoma with extension of a cystic component of disease to the medial temporal lobe apparent on MRI (contoured in blue), and extension of disease to the left sphenoid bone and orbital apex apparent on [68Ga]Ga-DOTA-TATE (contoured in yellow).](https://img.auntminnie.com/mindful/smg/workspaces/default/uploads/2026/04/pituitary-tumor.QGsEnyB4bU.jpg?auto=format%2Ccompress&dpr=2&fit=crop&h=167&q=70&w=250)
