The treatment planning of the Gamma Knife Radiosurgery is based on diagnostic imaging examinations (e.g. MRI, CT, or Angiography). Using advanced computer program to determine the precise radiology treatment area, this would avoid damaging surrounding normal brain tissue while effectively treating the pathological area such as the brain tumor or vascular abnormality. With the above mentioned high tech equipment, gamma knife surgery is a highly safe treatment method. It can avoid the danger and risks of traditional operation of the brain. Thus, Gamma Knife Radiosurgery plays a very important role in the modern neurological surgical treatment.