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CyberKnife vs. Gamma Knife

While there are many comparisons to the Gamma Knife, the CyberKnife System is the only dedicated stereotactic radiosurgery (SRS) treatment technology that also can be used to deliver stereotactic body radiation therapy (SBRT) for treatments throughout the body.

Gamma Knife and CyberKnife are both radiation emitting machines that are used for radiation therapy. CyberKnife can deliver anywhere in the body, but when treating brain tumors, a preponderance of data shows that CyberKnife unequivocally matches or beats the results of Gamma Knife. Whether you are a patient, or loved one seeking your best option, understand that CyberKnife matches or exceeds Gamma Knife clinically by design. This means studies show efficacy, safety, subsequent quality of life, and survival rates are always at least as good as Gamma Knife, and often better. In addition, patients tend to have much greater comfort and satisfaction with the process involved in CyberKnife treatment due to there being no need for a surgically placed headframe. Independent studies corroborating these claims are found on this page. It is important that if you have questions regarding the CyberKnife or its efficacy that you consult with our radiation oncologist; keep in mind, radiation therapy is a discipline unique from neurosurgery, and you should consult with a radiation expert because these are radiation procedures. With that understanding, this article will elucidate significant differences between the technology.

The Gamma Knife requires a headframe to be drilled into the patient’s skull (Look at Patient Experiences with headframe placement).  If that seems an antiquated process, that is because the Gamma Knife was designed in 1967 by a neurosurgeon, Lars Leksell, and the original methodology is largely still the method being used. As it is old technology, it is essentially culturally entrenched in the neurosurgery community. The bias, therefore, makes getting a fair comparison to CyberKnife quite difficult for patients.

CyberKnife, which started treating in 1994, was also invented by a neurosurgeon, John Adler, in collaboration with physicists and engineers, to improve on the Gamma Knife’s limitations. It can be implemented quickly and comfortably using a custom mask, no procedure or anesthesia required. CyberKnife has an electronic source, this means when the machine is off, the beam is off.  Gamma Knife surrounds the patient’s head with 192 live Co-60 sources.  Some falsely claim that, despite the additional pain and potential side effects to the patient from the headframe procedure, the Gamma Knife is still worthwhile because it is overall safer and more precise.  This is NOT true.

One of the limitations Gamma Knife has is that its deliveries center around a single point in space, this limits the machine’s ability to be as accurate when treating tumors with shapes that do not resemble an egg or a globe. Because this type of delivery is basic, the CyberKnife, and many other machines, can do this as well. But because CyberKnife is a robotic arm, it can freely move about the patient, allowing the radiation oncologist to make much more precise adjustments to the dose. In this way, they can avoid healthy tissue more readily, or simply limit high doses when the tumor is irregularly shaped.

One of the most significant limitations Gamma Knife has that Dr. Adler was attempting to overcome is that, due to the headframe, treatments must be a single fraction. This is problematic as, depending on the size and location of a tumor, a single fraction delivery can carry with it much greater risk of complication to the patient. Sometimes to accommodate a single treatment delivery, a sacrifice must be made to the dose being delivered to the tumor that could ultimately lower the efficacy of treatment.  Worse still, if a patient must hence be re-treated, it is much more difficult because of this.

We applaud your interest in researching your options, and encourage you to speak directly to experts, do not rely on one source, it is your health!

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