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从1972年第一代CT机问世至今,将近二十年的历史,CT机的结构和性能已有很大的发展,其普及的速度和范围也超出人们的想象,国外较大的医疗中心拥有5台左右CT机,国内区县级医院也拥有或将添置CT机。鉴于这种形势,不论该单位目前有否CT机,也不论放射科医生还是临床医生对CT知识的普及显得十分重要。本文分三个方面扼要介绍一下有关CT的基本知识。一、CT的优点和发展况CT的密度分辨率远高于常规X线摄影,比如普通头颅平片和腹部平片根本无法显示正常解剖结构,而现代高分辨率CT机可清
Since the introduction of the first generation of CT machines in 1972, nearly two decades of history, the structure and performance of CT machines have been greatly developed, and the popularity of the CT machines has exceeded the speed and scope of people’s imagination, and foreign large medical centers have About 5 sets of CT machines, domestic district and county hospitals also have or will acquire CT machines. Given this situation, whether or not the unit currently has CT machines, and whether radiologists or clinicians are very important to the spread of CT knowledge. This article briefly describes the basics of CT in three aspects. I. Advantages and development of CT The CT’s density resolution is much higher than that of conventional X-ray photography. For example, ordinary skull and abdomen plain films cannot display normal anatomical structures at all, but modern high-resolution CT machines can be used to