Dr Abd Hamid Mat Sain <[EMAIL PROTECTED]> wrote:
What is stereotactic radiosurgery?Stereotactic radiosurgery is a medical procedure that utilizes very accurately targeted, large killing doses of radiation. This noninvasive operation has proven to be an effective alternative to surgery or conventional radiation for treating many small tumors and a few other select medical disorders.
Standard stereotactic techniques rely on a rigid metal frame fixed to a patients skull for head immobilization and target localization. However, such frame-based systems have numerous limitations, including:
1) restricting treatment to the brain,
2) limiting the possible angles which radiation could be delivered,
3) causing considerable discomfort for the patient.In contrast to the standard frame-based radiosurgical instruments, the CyberKnife uses noninvasive image-guided localization, and a robotic delivery system. This combination of technologies enables the CyberKnife to overcome the limitations of older frame-based radiosurgery such as the Gamma Knife and LINAC.
What is image-guided CyberKnife radiosurgery?The present design of the CyberKnife derives from the original concept of a frameless alternative to frame-based radiosurgery. The CyberKnife consists of three key components: 1) an advanced, lightweight linear accelerator (LINAC) (this device is used to produce a high energy (6MV) "killing beam" of radiation), 2) a robot which can point the linear accelerator from a wide variety of angles, and 3) several x-ray cameras (imaging devices) that are combined with powerful software to track patient position. The cameras obtain frequent pictures of the patient during treatment, and use this information to target the radiation beam emitted by the linear accelerator.
The robot is instrumental in precisely aiming this device. When a patient moves during treatment, the change in position is detected by the cameras, and the robot compensates by re-targeting the linear accelerator before administering the radiation beam. This process of continually checking and correcting ensures accurate radiation targeting throughout treatment.
In summary, the CyberKnife replaces the stereotactic head frame with a patient-friendly image-guided localization system. This technology has the added benefit of enabling the CyberKnife to be used for radiosurgical applications outside the brain and for staged radiosurgery. It is difficult if not impossible to perform these other procedures with standard frame-based radiosurgical systems.From:CyberKnife.com
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