Method:Measure the CT localization acuracy using special markers in skullphantom and clinical use of different CT scanning method inlocalization of intracranial tumor during X-knife treatment.

• 方法：应用人体头颅模型内特定标记物测定CT定位的精度，在临床工作中应用不同的扫描方法对颅内肿瘤进行CT定位，观察其效果。