CT is a diagnostic imaging technique, the full name in English is computer-temography, translated into Chinese, that is, electronic computed tomography. This diagnostic imaging technology is composed of precise X-rays and highly sensitive detector system, around a target part of the human body, making one after another tomography scan, in the field of neurosurgery is very widely used, with fast scanning speed, clear images, three-dimensional reconstruction characteristics. A general plain scan of each area may cost 300 RMB, an enhanced scan costs another 300 RMB, and if a CT angiogram is done, it may cost close to 2000 RMB.