I believe this is Zap Surgical, developed by the same Stanford oncologist who invented Truebeam Radiotherapy. This device specially targets brain, head and neck cancers.
https://zapsurgical.com
ZAP - Makers of the ZAP-X® Gyroscopic Radiosurgery® Platform
Zap Surgical — ZAP-X is the first self-shielded gyroscopic radiosurgery platform, combining self-shielding technology with linear-accelerator delivery.
https://zapsurgical.com