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自从一九七二年英国EMI公司首次制成第一代头部用X线CT以来,仅仅经过三年的时间,第三代和第四代X线CT就相继问世。X线CT的摄影时间从初期的4.5分钟缩短到5秒钟以内,使用范围也从头部扩大到全身,在屏气条件下可以对全身任意部位进行摄影,图象质量也比初期显著提高。目前,国外用于临床的全身X线CT装置,几乎都是第三代或第四代。人体的内脏器官中,运动最剧烈的是心
Since the British EMI company first made the first generation of X-ray computed tomography headphone in 1972, it took only three years for the third and fourth generations of X-ray CT to come out in succession. X-ray CT imaging time from the initial 4.5 minutes reduced to 5 seconds, the use of the range from the head extended to the whole body, under breath holding anywhere in the body can be photographed, the image quality is also significantly higher than the initial. Currently, foreign countries for clinical X-ray CT devices, almost all third-generation or fourth-generation. The body’s internal organs, the most violent exercise is the heart