Objective To compare the value of two ultrasonic tissue characterization (UTC) methods (video frequency method and radio frequency method) in quantitative myocardial contrast echocardiography.
目的比较超声组织定征视频法与射频法在心肌声学造影定量分析中的应用价值。
In the method, the target reflected signal is generated by the way of coherent video simulation and the Doppler frequency of target is simulated on video.
本方法对目标回波信号采用了相干视频模拟法，在视频上模拟目标回波的多普勒频率。
Revesible video frequency teaching system is a new kind of important teaching method of distant teaching. It can realize distant teaching and studying and improve the teaching quality.
双向视频教学系统是远程教学的一种新的重要教学手段，它能实现远程交互教学，提高教学质量。
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