CyberKnife is a robotic system for radiosurgery which stands out from all the other radiosurgery systems currently on the market because of its potential and precision.
An exclusive characteristic of CyberKnife is its robotic arm that moves the linear accelerator (LINAC) with six degrees of freedom in space around the patient, with the advantage of being able to correct the direction of the treatment beam on the basis of target motion, completely automatically and without interruptions or repositioning of the patient. Furthermore, the robot is able to move the LINAC in space around the patient, generating a large number of radiation beams with different orientations in a non-coplanar, 3D geometry.
This feature provides highly conformal distributions of the doses and, at the same time, spares the healthy tissues surrounding the target. The conformality and immediate decrease in dose around the lesion being treated, together with the precision of orientation of the beams, allow the use of high doses of irradiation in one or a few treatment sessions.
Linac: the linear accelerator of the CyberKnife System produces X-rays with 6 MV energy and has twelve secondary, interchangeable, collimators with circular cross-sections for beams of 5 mm to 60 mm diameter. Localised tumours of different sizes, from very small to a few centimetres in diameter, can therefore be treated.
Image guidance system: this is formed of two radiogenic system and their two high-resolution detectors. This system keeps the patient’s position under control for the whole duration of the treatment, not only during the initial alignment, thus guiding the robot in directing the treatment beams so that they always hit the target lesion with extreme accuracy (0.5 mm). Thanks to the image guidance system, it is not necessary to use invasive systems for immobilising the patient.
The SynchronyTM system of tracking and compensating for breathing: CyberKnife is the only system in the world that synchronises the movements of the LINAC with those of the lesion caused by the patient’s respiration. It is possible to treat tumours which move during the patient’s normal breathing with exceptional accuracy (0.7 mm), without using techniques of respiratory gating or breath holding.