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ENGINEERED FOR CLINICAL BENEFITSUnique components, developed andpatented by Varian, advance theeffectiveness and the efficiency ofreliably delivering the prescribed dose.TARGETED TREATMENTSThe right doseWhen a Varian linear accelerator delivers a beam, clinicians havecome to trust that it is the exact dose they specified and thatthe accelerator will repeat the exact same dose deliverysequence, time and time again, in the blink of an eye, without fail.Here are just some of the reasons why:WAVEGUIDE. Steering the beam with precision.Real-time beam steering is a great example of Varian’s precise dosedelivery. Our waveguide, bending magnet, and other unique componentswork seamlessly together to steer Varian beams with great accuracy. Dualsealed ion chambers work as a feedback loop, keeping the steering mechanismtrue, so that every pulse ensures delivery of exactly the right dose tothe patient. Any asymmetry is automatically corrected in milliseconds.Gated radiotherapy beam-on pulses aresynchronized with tumor position andverified using On-Board Imager kVimaging system fluoro capability.GRIDDED ELECTRON GUN. Fastest beam-on, beam-off.Varian’s gridded electron gun provides 2 to 3 ms beam control (full ON tofull OFF). This true, gated radiotherapy “freezes” the patient’s respiratorymotion, restricting treatment to certain respiratory cycle phases andsparing normal tissue from irradiation.ENERGY SWITCH, TIGHTEST ISOCENTER. Highest dose and shortest time.Consistency, stability and alignment are all critical in delivery systems.Varian’s patented energy switch provides a full range of beam energies atconsistently high, stable dose rates—even with low-energy x-ray beams.It also boasts the industry’s tightest isocenter (±0.5 mm), enablingstereotactic radiosurgery.Pinpoint stereotactic treatments areenabled through tight mechanicaland electronic processes.RELIABLE DOSEYou can be certain that every timeyou turn on a Varian beam, dayafter day, second after second, you’llachieve the best possible therapeuticratio of tumor-to-normal-tissue dose.Varian’s real-time beam steering anddual sealed ion chamber ➊ ensurethat optimal beam symmetry,flatness and dosimetry is deliveredthroughout all gantry angles.FAST TREATMENT TIMESA unique energy switch ➋ optimizesthe guide length to deliver thehighest dose rates for all energies,up to 1000 MU per minute forstereotactic beams. That translatesto shorter treatment times, whichbenefit the patient as well as thetreatment facility.ACCURATE BEAM CONTROLBy coordinating an optimallydesigned system of gridded gun ➌,waveguide ➍, bending magnet ➎and solenoid ➏, Varian systemscreate an instantly controllable,tightly focused beam that makesmotion management possible, andresults in both the best conformalityto the tumor and the sharpestpossible images.BENDING MAGNET. Smallest, sharpest beam focal spot.Coupled with Varian’s 3D servo system, the achromatic three-field bendingmagnet provides for a 2 mm circular focal spot that’s optimal for portalimaging and allows high-dose treatment of diseased tissue even when it’snext to a critical structure.Targets located near critical organs are wellcovered while adjacent structures are spared.