为显示更佳的超声图像，需要适当地调整观测装置的画质调整功能（增益、对比度）。
①增益：调整显示图像的亮度。
②对比度：调整显示图像的明暗差异。
通过将焦点聚集在目标（关注部位）上，提升焦点周围的分辨率。
将超声波传输到活体中后，使超声信号失真，产生高次谐波*（Harmonic）。THE是利用该高次谐波分量进行成像的技术。能够减少对查看图像造成干扰的伪影。
*高次谐波：针对某一频率，其整数倍的频率分量。
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