Varian High Energy Linear Accelerators* Comparison Chart

Model Edge TrueBeam Trilogy Clinac iX Clinac <2100C / 2100CD Clinac 21EX
Other Variations Edge Radiosurgery System TrueBeam STX, SVC (Small Vault Configuration), VitalBeam Trilogy STX, Novalis, Trilogy Silhouette iX Silhouette, DMX, DHX, 2100C, CX 2100C, 2300C/D, 2100C/D 21EX Silhouette, 2100C, 2100C/D 23EX
Years Manufactured 2013 & newer 2010 & newer 2005 & newer 2004 - current 1988-2007 1998-2006
Power Source Klystron Klystron Klystron Klystron Klystron Klystron
Photon Energy Configuration 6&10/15/18 6&10/15/18 6&10/15/18 6&10/15/18 6&10/15/18 6&10/15/18
Electron Energies Yes Yes Yes Yes Yes Yes
Multi-Leaf Collimator (MLC)** 120 Leaf HDMLC 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) 80 MLC (Field size 40x40cm); 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 aS500, aS1000 LC250, aS500, aS1000 (optional) LC250, aS500, aS1000 (optional)
Treatment Delivery 3D, IMRT, SRS/SBRT 3D, IMRT, RapidArc, SRS/SBRT 3D, IMRT, RapidArc, SRS/SBRT 3D, IMRT, RapidArc, SRS/SBRT (optional) 3D, IMRT, SRS/SBRT (optional) 3D, IMRT, SRS/SBRT (optional)
KV Imaging for IGRT** OBI OBI OBI OBI (optional) OBI (optional) OBI (optional)
Cone-Beam CT Yes Yes Yes Only with OBI Only with OBI Only with OBI
VMAT Yes Yes Yes Only with OBI Only with OBI Only with OBI
Stereotactic Radiosurgery** Integrated with LINAC Integrated with LINAC Integrated with LINAC Optional Cones or mMLC Optional Cones or mMLC Optional Cones or mMLC
Treatment Couch PerfectPitch Exact IGRT Exact IGRT Exact, Exact IGRT (optional) ETR, Exact (optional) Exact
Silhouette Option Available for Smaller Room Size Yes Yes Yes Yes Yes
Market Demand***
Pros Designed for stereotactic radiosurgery (SRS)

Intracranial radiosurgery package

2400 mu/min dose rate
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
Similar to 21EX and iX 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 So new that none exist in secondary market 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
Similar to 21EX and 21iX Installation costs are similar to newer models

Some may not have all the desired options
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*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.

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