Varian High Energy Linear Accelerators* Comparison Chart
Model | TrueBeam / VitalBeam | Trilogy | Clinac iX | Clinac 21EX |
Other Variations | TrueBeam STX, SVC (Small Vault Configuration), VitalBeam | Trilogy STX, Novalis, Trilogy Silhouette | iX Silhouette, DMX, DHX, 2100C, CX | 21EX Silhouette, 2100C, 2100C/D 23EX |
Years Manufactured | 2010 & newer | 2005 & newer | 2004 - current | 1998-2006 |
Power Source | Klystron | Klystron | Klystron | Klystron |
Photon Energy Configuration | 6&10/15/18 | 6&10/15/18 | 6&10/15/18 | 6&10/15/18 |
Electron Energies | Yes | Yes | Yes | Yes |
Multi-Leaf Collimator (MLC)** | 120 MLC (Field size 40x40cm, Central 20cm of field - 5mm leaf width, Outer 20cm of field - 10mm leaf width) | 120 MLC (Field size 40x40cm, Central 20cm of field - 5mm leaf width, Outer 20cm of field - 10mm leaf width) | 120 MLC (Field size 40x40cm, Central 20cm of field - 5mm leaf width, Outer 20cm of field - 10mm leaf width) | 80 MLC (Field size 40x40cm); 120 MLC (Field size 40x40cm, Central 20cm of field - 5mm leaf width, Outer 20cm of field - 10mm leaf width) |
Portal Imager(EPID)** | aS1000 | aS1000 | aS1000 | LC250, aS500, aS1000 (optional) |
Treatment Delivery | 3D, IMRT, RapidArc, SRS/SBRT | 3D, IMRT, RapidArc, SRS/SBRT | 3D, IMRT, RapidArc, SRS/SBRT (optional) | 3D, IMRT, SRS/SBRT (optional) |
KV Imaging for IGRT** | OBI | OBI | OBI | OBI (optional) |
Cone-Beam CT | Yes | Yes | Only with OBI | Only with OBI |
VMAT | Yes | Yes | Only with OBI | Only with OBI |
Stereotactic Radiosurgery** | Integrated with Linear Accelerator (LINAC) | Integrated with Linear Accelerator (LINAC) | Optional Cones or mMLC | Optional Cones or mMLC |
Treatment Couch | Exact IGRT | Exact IGRT | Exact, Exact IGRT (optional) | Exact |
Silhouette Option Available for Smaller Room Size | Yes | Yes | Yes | Yes |
Market Demand*** | ||||
Pros | Fully integrates gating, imaging, and arc therapy High level of precision for SRS/SBRT, higher dose rate, Rapid Arc is standard | Great for SRS and SBRT Offers all the features of an iX Tighter isocenter than iX Service/maintenance costs lower than TrueBeam Very stable platform | Varian’s workhorse machine; very reliable Come with a variety of upgrades & options | Essentially the same as a 21/23iX for much lower cost Lots of available systems, many with low beam hours Great value system for an affordable price |
Cons | Expensive, although pricing has decreased Service/maintenance contracts are expensive Some parts are very expensive to replace So new that few exist in secondary market | Not many available in the secondary market | Some may not have all the desired upgrades Limited inventory in secondary (used) equipment market | Installation costs are similar to newer models Some may not have all the desired options |