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Gamma Knife® versus the Accuray CyberKnife®

Gamma Knife stereotactic radiosurgery (SRS) is the gold standard for treating intracranial SRS procedures. It has been used for nearly four decades, with more than 350,000 cases treated worldwide. It has provided the data for over 2,000 medical publications. Gamma Knife is used as the standard against which other technologies, such as the Accuray CyberKnife®, are measured.

UK HealthCare's team of specialists offer the following comparison of Gamma Knife and CyberKnife®: 

Gamma Knife




Radiologic accuracy better than 0.3mm  

1 mm accuracy; dose outside the target area is 2-6x greater than with GK  

Rigid immobilization to prevent head movement using a lightweight stereotactic head frame fixed to the outer skull.  Provides exact MR and CT correlation from planning to treatment delivery in 3D.  

Non-rigid immobilization reduces head movement by using a thermoplastic face mask that is shrink-wrapped to the table during treatment.  Provides relative MR and CT correlation from planning to treatment delivery in 3D.  The CK is inherently less accurate since the positioning is optically guided, not head-frame based.  

Treatment delivered during one session  

Single or multiple treatments , possibly over a period of days  

Target position is confirmed 10 times per second  

Target position confirmed once every 10 seconds  

  From both a technical and clinical standpoint, Gamma Knife is unmatched in its design.

Page last updated: 10/16/2013 4:48:46 PM