彩超和黑白超的区别

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                    <h3 style="line-height: 2em;">普通B超</h3><p style="line-height: 2em;">　　B超经过了三个发展阶段，最早采用的是黑白超声诊断技术，也就是现在的普通B超。通过超声探头测得的图像是黑白的，只能观测到胎儿的组织结构，测量头有多大、身有多长。</p><p style="line-height: 2em;"><br  /></p><p style="line-height: 2em;"><img data-s="300,640" data-type="jpeg" src="http://mmbiz.qpic.cn/mmbiz_jpg/dx3KibwtDhvc5y2cAfeY3M8ap1xBlKRL3ia0GB8Bm3sxuIcQiapVF1FgXh1m0pliae3uHSq2J9d13Ij33kTUQF3Fbg/0?wx_fmt=jpeg" data-ratio="0.7018813314037626" data-w="691"  /><br  /></p><p style="line-height: 2em;"><br  /></p><p style="line-height: 2em;"><br  /></p><h3 style="line-height: 2em;">彩色B超</h3><p style="line-height: 2em;">　　上世纪80年代在普通B超的基础上出现了彩色-多普勒超声波探测诊断技术，观测到的图像以红蓝两色为主，面向探头的呈现红色，反之为蓝色。</p><p style="line-height: 2em;">　　这种技术能够观测到胎儿的血液流动情况，有利于及时发现胎儿的异常，例如胎儿颈部如有血流环，则意味着发生了可导致窒息死亡的脐带绕颈。</p><p style="text-align:center"><br  /></p><h3 style="line-height: 2em;">三维B超</h3><p style="line-height: 2em;">　　普通B超和彩色B超都是二维平面图像，目前这两种技术仍在使用，但由于观测效果较为依赖羊水量和胎儿体位，一旦在怀孕晚期羊水减少或者胎儿面向母亲的背部，观测效果就不太理想。而且，二维图像不能满足准妈妈们“看到”宝宝模样的愿望。因此，最近几年，随着计算机技术的发展，又出现了三维B超，也就是将二维图像合成模型，透过屏幕可从各个方位观察胎宝宝。</p><p style="line-height: 2em;"><br  /></p><p style="text-align:center"><img data-s="300,640" data-type="jpeg" src="http://mmbiz.qpic.cn/mmbiz_jpg/dx3KibwtDhvc5y2cAfeY3M8ap1xBlKRL3VS6f7JhIxia7omxLDAMwmyLGPu8yoqQoCCicZYNullhM7I4vDCduGYibg/0?wx_fmt=jpeg" data-ratio="0.779510022271715" data-w="449"  /></p><p style="text-align:center"><br  /></p><h3 style="line-height: 2em;">四维B超</h3><p style="line-height: 2em;">　　简称4D超声，是目前世界上最先进的彩色超声设备。第四维是指时间这个矢量。对于超声学来说，4D超声技术是新近发展的技术，4维超声技术就是采用3维超声图像加上时间维度参数。该技术能够实时获取三维图像，超越了传统超声的限制。它提供了包括腹部、血管、小器官、产科、妇科、泌尿科、新生儿和儿科等多领域的多方面的应用。</p><p><br  /></p><p style="max-width: 100%; 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