The Clinac® EX linear accelerators that offer high performance while maintaining maximum efficiency. The systems feature an instant beam-on with dynamic treatment control. A large variety of energy options are available in order to treat the widest number of patients. The units feature a precise focal spot size for optimum portal imaging and deliver high dose rates for the greatest throughput. Combined with optional integrated Varian multi leaf collimation and electronic portal imaging systems, the Clinac allows clinicians to to perform computer driven or conventional techniques.