Varian Single Energy Linear Accelerator Comparison Chart
Varian’s single-energy linear accelerators are designed for facilities that require a reliable, lower-cost solution focused on 6 MV photon energy treatments. These systems, such as the Clinac 6EX and Clinac 600CD, deliver solid performance for 3D conformal radiation therapy and are often used in palliative care or lower-volume treatment environments. This comparison chart outlines key specifications—including years of manufacture, beam configuration, and system variations—to help you evaluate which Varian single-energy system best fits your clinical and operational needs.
| Model | Clinac 600CD/6EX/DBX | Clinac 600C/CD/DBX | 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 (Field size 40x40cm); 120 MLC (Field size 40x40cm, Central 20cm of field - 5mm leaf width, Outer 20cm of field - 10mm leaf width) | 52 (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 | Dual Layer |
| 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 |
| Pros | Will fit into smaller vaults than high energy systems, even Silhouette models Simpler and faster to install Easier and less expensive to service | It is a versatile and powerful machine that is reliable, durable, and an efficient linear accelerator. | 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 | It is also a large and complex machine that requires regular maintenance and calibration | 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 |
Feedback and Updates This comparison chart is maintained to provide current and accurate information about Varian linear accelerator models. Given the ongoing advancement of radiation therapy technology and the medical equipment market, we welcome feedback to ensure this resource remains valuable for healthcare professionals making equipment decisions. Feel free to Contact Us to speak with a radiation oncology specialist about your specific needs or questions.