Developed by a Swedish neurosurgeon, Gamma Knife is a technology to treat cranial diseases with gamma beams with millimeter accuracy. The current model of Gamma Knife device, Gamma Knife Icon, is used for treatments at Acıbadem Gamma Knife unit. Gamma Knife directs the beams originating from hundreds of cobalt sources to a punctual target. Although each source directs low-energy ray bundles, it is possible to transmit very high energy to the target by combining hundreds of rays on a single focus. It is considered that the effect of Gamma Knife therapy is the result of damage to genetic codes of tumors in brain. This damage follows two different pathways in different brain diseases. The therapy intends to destroy the rapidly growing tumors and arteriovenous malformations and to stop growth in slowly growing tumors. Diseases of brain can be treated with Gamma Knife along with the diseases that involve bones, vessels, nerves, skin and other tissues around the brain. Gamma Knife is most commonly preferred for metastases of various cancers to brain, AVMs, metastatic brain tumors as well as benign brain tumors, such as vestibular schwannomas and meningiomas. Gamma Knife has been installed at more than three hundred facilities and used to treat more than one million patients around the world. It is a standard treatment for intracranial diseases. 7000 patients have been treated at Acıbadem Gamma Knife Unit since 2005. Gamma Knife has been designed and…