Varian Edge
Manufacturer: Varian · Modality: Linear Accelerator
SRS- and SBRT-dedicated compact linac. High dose rate (2400 MU/min flattening-filter-free) + HD 120 MLC (micro-leaf multi-leaf collimator) + PerfectPitch 6 degrees-of-freedom couch. Sold to centers that do high-volume SRS + SBRT and want a platform optimized for those fraction patterns rather than general IMRT/VMAT.
What makes Edge distinct from TrueBeam
- 2400 MU/min FFF — shortest SRS fraction times in the Varian lineup
- HD 120 MLC — 2.5 mm leaf width at isocenter center + 5 mm at periphery (vs TrueBeam's standard Millennium 5/10 mm)
- PerfectPitch 6DoF couch — pitch / roll / yaw correction in addition to X/Y/Z. Essential for SRS.
- Calypso real-time tracking integration
- Limited energy set — 6 MV + 6 MV FFF + 10 MV FFF (no 15/18 MV). Not a workhorse linac; SRS/SBRT-optimized.
Clinical use
- Brain SRS (stereotactic radiosurgery)
- Spine SBRT
- Lung SBRT
- Liver SBRT
- Oligometastatic disease
- Prostate SBRT
Specs
- 6 MV + 6 MV FFF + 10 MV FFF
- 2400 MU/min (FFF)
- HD 120 MLC
- PerfectPitch 6DoF couch
- Calypso real-time tracking
- OBI + CBCT
- RapidArc / VMAT
Clinical positioning
Direct competitor to CyberKnife for SRS/SBRT. Different architecture (conventional gantry vs robotic arm), different beam geometry. Edge delivers faster (higher MU/min) but fewer unique beam angles per patient vs CyberKnife's non-coplanar approach.