这个问题可以通过使用超声波来解决，也就是利用一个大小和心脏起搏器差不多，名为“脉冲发生器”的盒子来完成，但是它需要被放在胸腔下部(如上图所示)。
That is done using ultrasound, which is generated by a box called a pulse-generator that is similar in size to a pacemaker box, but is inserted lower down in the chest (see illustration).
因此，根据现有实验条件和其他客观因素，我们进行了多频率超声波发生器的自主研制工作，为我们后面的实验创造实验了条件。
Therefore, according to existing experiment conditions and other objective factors, we carried on an independence research and manufacture work of multi-frequencies ultrasonic device.
高性能，可编程的超声波脉冲发生器和宽频接收器。与仪器配套软件一起使用。
High performance, programmable ultrasonic pulser and broad band receiver. For use with virtual instrument software.
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