Ultrasounds Importance in the Clinic and Medical Diagnostics

L. Ferrara
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Abstract

17 Ultrasounds are acoustic vibrations that are not perceived by the human ear as their frequency is greater than 20,000 Hz. They are artificially generated by the action of the electric current, whose polarity is periodically reversed, on a quartz crystal, subjecting it, by the action of the electromagnetic field created, to successive contractions and expansions. This alternation of movements generates vibrations, which, transmitted to cellular and intercellular structures, cause collisions and generate heat [1].
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超声在临床和医学诊断中的重要性
17超声波是人耳无法感知的声波振动,其频率大于20,000赫兹。它们是通过电流的作用人工产生的,电流的极性周期性地反转,在石英晶体上,通过产生的电磁场的作用,使它连续收缩和膨胀。这种运动的交替产生振动,振动传递到细胞和细胞间结构,引起碰撞并产生热量[1]。
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