Varian Single Energy Linear Accelerators* Comparison Chart

Model Clinac 600CD/6EX Clinac 600C/CD Unique Halcyon
Years Manufactured 1999 & newer 1989 -1999 2012 & newer 2017 & newer
Power Source Magnetron Magnetron Magnetron Magnetron
Photon Energy Configuration 4 MV or 6 MV 4 MV or 6 MV 6 MV 6 MV FFF
Electron Energies N/A N/A N/A N/A
Multi-Leaf Collimator (MLC)** 80 MLC (Field size 40x40cm); 120 MLC (Field size 40x40cm, Central 20cm of field - 5mm leaf width, Outer 20cm of field - 10mm leaf width) 52 MLC (Field size 26x40cm, Leaf widths 10mm); 80 MLC (Field size 40x40cm); 120 MLC (Field size 40x40cm, Central 20cm of field - 5mm leaf width, Outer 20cm of field - 10mm leaf width) (optional) 120 MLC Dual Layer MLC
Portal Imager(EPID)** aS500, aS1000 (optional) (optional) LC250, aS500, aS1000 aS500II NO
Treatment Delivery 3D, IMRT, SRS (optional) 2D, 3D (optional), IMRT (optional), SRS (optional) 2D, 3D (optional), IMRT (optional), SRS/SBRT (optional) IMRT, RapidArc
KV Imaging for IGRT** N/A N/A N/A YES
CBCT N/A N/A N/A Volumectric CMBCT, 15 sec Image Capture
VMAT N/A N/A Yes with Software Multi-Arc VMAT
Treatment Couch Exact ETR, Exact (optional) Exact Halcyon
Market Demand***
Pros Will fit into smaller vaults than high energy systems, even Silhouette models Simpler and faster to install Easier and less expensive to service Similar to a 6EX in performance Two versions available Can be upgraded to perform Rapid Arc 2X quieter than other systems Accelerated treatment time 100% image guidance
Cons Only available with single photon energy (6MV or 4MV) Waveguides and magnetrons often require replacement No electron energies available Only available with single photon energy No electrons Not sold in the U.S. as new Limited availability in the used market Only available with single photon energy No electrons
*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 are lower. One star indicates very little, if any, demand currently exists.

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