在1970～1975年间曾出现一次将超声成象术应用到临床医学的高潮。当时应用频率范围为1～10兆赫的超声能量发展了多种成象技术。今天这些应用主要属于脉冲回波技术的范畴,如腹内显象法和用于产科的B-扫描截面显象法,用于脑回波摄影术的A-扫描,以及用于心动回波描记术的M-扫描。一种叫做多普勒超声的特殊脉冲回波技术在测 In the period from 1970 to 1975, there was a climax of applying ultrasound imaging to clinical medicine. A variety of imaging techniques were developed using ultrasonic energy in the frequency range of 1 to 10 megahertz. Today these applications are mainly in the category of pulse echo techniques such as intra-abdominal imaging and B-scan cross-sectional imaging for obstetrics, A-scan for brain echo photography, and echocardiography M-scan of surgery. A special pulse echo technique called Doppler ultrasound is under investigation