| Model | Precise | Synergy/S | Synergy Platform | Compact | Infinity/Axesse | Versa HD | Harmony | Unity |
| Years Manufactured | 1997-2005 | 2002 & newer | 2002 & newer | 2008 & newer | 2009 & newer | 2013 & newer | 2020 & newer | 2018 & newer |
| Power Source | Magnetron | Magnetron | Magnetron | Magnetron | Magnetron | Magnetron | - | - |
| Photon Energy Configuration | 6&10/15/18 | 6&10/15/18 | 6&10/15/18 | 6 | 6&10/15/18 | 6&10/15/18 | - | - |
| Electron Energies | Yes | Yes | Yes | No | Yes | Yes | - | - |
| Multi-Leaf Collimator (MLC)** | 80 (Field size 40x40cm, leaf thickness-10mm) | 80 (Field size 40x40cm, leaf thickness-10mm) Optional: 160 Agility | 80 (Field size 40x40cm, leaf thickness-10mm) | 80 (Field size 40x40cm, leaf thickness-10mm) | 80 (Field size 40x40cm, leaf thickness-10mm) Optional: 160 Agility | 160 Agility (Field size 40x40cm, leaf thickness-5mm) | - | - |
| Portal Imager(EPID)** | iViewGT(Amorphous Silicon), iView (camera based) | iViewGT(Amorphous Silicon) | iViewGT(Amorphous Silicon) | Optional | iViewGT(Amorphous Silicon) | iViewGT(Amorphous Silicon) | - | - |
| Treatment Delivery | 3D, IMRT, SRS/SBRT (optional) | 3D, IMRT, VMAT, SRS/SBRT (optional) | 3D, IMRT, VMAT, SRS/SBRT (optional) | 3D, IMRT, SRS/SBRT (optional) | 3D, IMRT, VMAT, SRS/SBRT (Axesse) | 3D, IMRT, VMAT, SRS/SBRT, SRT, SABR | - | - |
| KV Imaging for IGRT** | N/A | XVI | N/A | N/A | XVI | XVI | - | - |
| CBCT | N/A | XVI | N/A | N/A | XVI | XVI | - | - |
| VMAT | N/A | Yes | Only with XVI | N/A | Yes | Yes | - | - |
| Treatment Couch | Precise | Precise | Precise | Precise | Precise, Hexapod (optional) | Hexapod (6 degrees of motion) | - | - |
| Pros | Many systems available in secondary market Relatively inexpensive to acquire Some are dismantled and used for parts | Reliable, digital technology Includes the XVi KV-imaging | Relatively inexpensive in secondary market | Good, budget system for international markets Reliable | Digital System | Latest, cutting-edge technology Competes with Varian TrueBeam Integrates VMAT, gating, CBCT | - | - |
| Cons | Installation costs can double the cost of equipment | Few | Does not include XVi component Fewer trained service engineers in U.S. than Varian | None available in the U.S. Single photon energy only | Few installed in the U.S. | More expensive than other devices None available in the secondary market yet | - | - |
*Data shown here may not be accurate and is based on equipment seen in the secondary market. See manufacturers for exact data.
**Similar devices are manufactured by vendors other than the linear accelerator manufacturer.
***Five stars indicate that the resale demand for like systems is high, and used equipment will therefore command a higher price. Few stars indicate that the resale demand is lower, and prices for used equipment is lower. One star indicates very little, if any, demand currently exists.
