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<section><section powered-by="gulangu"><section><section data-role="paragraph" data-color="rgb(182, 228, 253)" data-custom="rgb(182, 228, 253)"><section><section><section><section powered-by="gulangu"><section><section><section><section powered-by="gulangu"><section><section><section><section powered-by="gulangu"><section><section><section><section powered-by="gulangu"><section><section><section><section><p><p><img src="image/20201014/86b79d371e9862b01189f0252a03b2cd_1.png" /></p></p></section><section><section><span><strong></strong></span></section><p><span>医疗器械媒体报道先锋</span></p><p><span>分享专业医疗器械知识</span></p></section><section><section><section>关注</section></section></section></section></section></section></section></section></section></section></section></section></section></section></section></section></section></section></section></section></section></section></section><p><strong><span>来源：</span></strong></p><section><br /></section></section><section><section><p><img src="image/20201014/90e57e58fe6abde5e9766283e870d46c_2.jpg" /></p></section></section></section><section powered-by="gulangu"><section><section><p><br /></p><p>抹香鲸头部的鲸蜡器官是一个超级传导体，有极其灵敏的探测功能，相当于一个“声纳”。它能用发出超声波的喀嗒声而听其回音，用以在漆黑的深海探寻食物，以“声纳”替代不发达的小眼睛。</p><p><br /></p><p>你知道医学影像中的“抹香鲸”是谁吗？快戳下面这个视频了解一下呗~</p><p><br /></p><p><iframe src="https://v.qq.com/iframe/player.html?width=500&height=375&auto=0&vid=h0808zqoogf&auto=0" width="100%" height="580" frameborder="0"></iframe></p><p><strong><span><br /></span></strong></p><p><strong><span>超声波是如何产生的？</span></strong></p><p><strong><span><br /></span></strong></p></section></section></section><section powered-by="gulangu"><section><section><p>超声诊断仪主要由超声换能器、基本电路、显示电路组成。换能器的核心是晶片，承担着机械能与电能之间的转换。当在镜片上施加一机械振动时，晶片材料将机械能转换为电能，称为正压电效应。当在晶片上施加一交变电信号时，晶片材料将电能转变为与交变信号同频率的机械能，称为逆压电效应。这种逆压电效应产生了超声波。</p><p><br /></p></section></section></section><section powered-by="gulangu"><section><section><p><img src="image/20201014/db07409ff84f7b386233a85a7f1e1792_3.png" /></p></section></section></section><section powered-by="gulangu"><section powered-by="gulangu"><section><section><p><strong><br /></strong></p><p><strong>超声如何成像？</strong></p><p><strong><br /></strong></p></section></section></section><section powered-by="gulangu"><section><section></section></section><section><br /></section></section></section><section powered-by="gulangu"><section><section><p><span>人体组织和脏器具有不同的声阻抗，在声阻抗突变的界面会产生回波。将超声脉冲波发射到生物体内，再接受来自生物体的反射回波信号，完成对生物体组织的扫差。由于超声波在人体内的传播速度比X射线要慢很多，在发射完持续时间仅几微秒的超声波脉冲后，随着超声波脉冲在人体内的传播，大约有700微秒的时间可以用来接受、放大和处理微波信号。</span><br /></p></section></section></section><section powered-by="gulangu"><section><section><p><br /></p></section></section></section><section powered-by="gulangu"><section><section><p><img src="image/20201014/7955931631680f01b88e541e9f737a89_4.png" /></p></section></section></section><section powered-by="gulangu"><section><section><p><br /></p></section></section></section></section><section><section powered-by="gulangu"><section><section><p><strong><span>本文视频来源网络，出于科普目的翻译整理，转载请注明出处。</span></strong></p></section></section></section></section><section><section powered-by="gulangu"><section><section><section><section powered-by="gulangu"><section><section><p><br /></p><section data-id="1658"><section><section><section data-id="1658"><section><section><section data-id="1658"><section><section><section data-id="1658"><section><section><p><span><strong>相关阅读</strong></span></p></section><p><p><img src="image/20201014/ec237188ae1e9c03eb4d9814f31b18ab_5.gif" /></p></p><p><span>科普动画|MRI、CT、PET分别是怎么扫描图像的？</span><br /></p><p><br /></p><p><span>重磅！ “超声CT”问世，有望解放超声科医生双手！</span><br /></p><p><br /></p><p><span>同为64排CT，为什么“它”叫128层，“你”却是64层？</span><br /></p><p><br /></p><p><span>医疗器械唯一标识（UDI）为什么如此重要？</span><br /></p></section></section></section></section></section></section></section></section></section></section><br /></section><p><br /></p><p><p><img src="image/20201014/225eae26a91575de7508aebe3e999278_6.jpg" /></p></p></section></section></section></section></section></section></section></section>
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发表于 2020-10-14 15:10:31