LINAC-MLC-based radiosurgery Non-invasive stereotactic radiosurgery procedures that utilises technologies that focus small high-dose radiation beams onto specific points (focus spot) within the trigeminal nerve root (isocentric treatment). The technologies use a large high-energy linear accelerator (LINAC) x-ray source and have multileaf collimator (MLC) capability. Machines that utilise this technology include Novalis®, Trilogy®, and Truebeam®. The procedures are usually performed with CT scan guidance, without the use of a stereotactic reference frame.