CyberKnife stereotactic radiosurgery precisely targets a brain tumor in a patient.
Stereotactic radiosurgery refers to the use of three-dimensional targeting system to direct a high-energy beam of radiation at cancerous or other diseased tissue. More specifically, the CyberKnife® uses a combination of image guidance technology and computer-controlled robotics to continuously track, detect and correct for tumor and patient movements throughout the treatment. If the patient moves during treatment, the CyberKnifeÒ automatically detects and compensates for the change, further ensuring that the target tumor location, and not healthy tissue, is reached.
The Technology
The machine is made up of a lightweight linear accelerator (which supplies the radiation) mounted on a robotic arm. Using image guidance cameras, the system locates the position of the tumor. Real-time imaging allows for patient movement tracking with sub-millimeter spatial accuracy. Multiple radiation beams enter the body from different targeting positions and angles.
All the beams intersect within the tumor or lesion where the cumulative dose is high enough to destroy the cancer cells. The system’s accuracy minimizes the amount of radiation affecting surrounding healthy tissue.
Procedure Performed by Radiation
Oncologists and Surgeons
CyberKnife® procedures are typically completed by a radiation oncologist and a surgeon working as a team. The radiation oncologist develops the treatment plan with the assistance of a surgeon, who provides anatomical consultation. Thus far, Crozer-Keystone physicians and surgeons have treated patients for thoracic and head and neck cancers. But malignant and benign tumors in other areas – such as the spine, prostate, liver and pancreas – can be treated with the CyberKnife®.