同为64排CT，为什么“它”叫128层，“你”却是64层？

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                    <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>医疗器械第一新媒体</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><section><section powered-by="gulangu"><section><section><p><span><strong><span>来源：</span></strong></span></p><p><span><strong><span><br  /></span></strong></span></p></section></section></section></section><section><section powered-by="gulangu"><section><section><p>对于CT的“排”和“层”，你是不是有十万个为什么？同为64排CT,为什么有的是128层，而有的却是64层？小编针对大家的疑惑，特意整理了这篇文章。</p></section></section></section><section powered-by="gulangu"><section><section><p><br  /></p></section></section></section><section powered-by="gulangu"><section><section><section powered-by="gulangu"><section><section><p><strong>CT的“排”和“层”</strong></p></section></section></section></section></section></section><section powered-by="gulangu"><section><section><p><br  /></p><p>一般我们说CT的“排”（detector row），其实指的就是CT的探测器在Z轴方向的物理排列数目，即有多少排探测器,是CT的硬件结构性参数。</p></section></section></section><section powered-by="gulangu"><section><section><p><img src="image/20201014/825e0c9dabe54e62bdcf675c06cbbd7d_2.png" /></p></section></section></section><section powered-by="gulangu"><section><section><p>多排探测器系统一般采用的是闪烁陶瓷探测器。闪烁探测器是利用射线能使某些物质闪烁发光的特性来探测射线的装置。目前广泛采用的是UFC——超高速稀土陶瓷探测器。</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/f2b3a44cd3be20ed3ebcf59b956b1748_3.png" /></p></section></section></section><section powered-by="gulangu"><section><section><p>（<span>西门子的超高速稀土陶瓷探测器（UFC）实物</span><span>）</span></p></section></section></section><section powered-by="gulangu"><section><section><p><br  /></p></section></section></section><section powered-by="gulangu"><section><section><p><span>而“层”（Slice）指机器每旋转一周，CT数据采集系统DAS同步获得图像的能力，也就是同时扫描（或说采集数据）多少层，是一个功能性参数。</span></p><p><span><br  /></span></p><p><br  /></p></section></section></section><section powered-by="gulangu"><section><section><p>很显然，“多层”才是人们真正期待的。目前的CT基本上都是多层CT（MSCT），即Multi-Slice CT或Multi-slice&nbsp;spiral CT或Multislice CT。</p></section></section></section><section powered-by="gulangu"><section><section><p><br  /></p></section></section></section><section powered-by="gulangu"><section><section><section powered-by="gulangu"><section><section><p><strong>“排”和“层”的区别</strong></p></section></section></section></section></section></section><section powered-by="gulangu"><section><section><p><br  /></p></section></section></section><section powered-by="gulangu"><section><section><p><span>看到这里大家肯定都清楚了“排”不等于“层”。同样的64排CT，128层的表示扫描一圈能获得128层图像，64层的表示扫描一圈能获得64层图像。</span></p><p><span><br  /></span></p><p><br  /></p><p>如下图所示明峰这台128层64排探测器CT，在Z轴用了<span>飞焦点技术，保证了高空间分辨率。采用</span><span>256通道A/D ASIC技术，保证低噪声，可用于心脏扫描。</span></p><p><br  /></p></section></section></section><section powered-by="gulangu"><section><section><p><img src="image/20201014/451b348018877074b5b0e2f4dcc1778d_4.jpg" /></p></section></section></section><section powered-by="gulangu"><section><section><p>明峰 ScintCare CT64/128</p></section></section></section><section powered-by="gulangu"><section><section><p><br  /></p></section></section></section><section powered-by="gulangu"><section><section><p>GE家的这台大家应该不陌生了吧，CT680的技术奥秘在于一直以来闻名业内的“自由心”技术。这项技术可以做到在自由心率下实现冠脉清晰成像。此外还有开发的动态500排(VolumeHelicalShuttle)技术，使CT680自由心成为业内首台全器官4D功能CT，实现了在不降低图像质量前提之下的更大范围成像。</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/20201014/934b066e59803a4caf9d26b91e9dab14_5.jpg" /></p></section></section></section><section powered-by="gulangu"><section><section><p>GE Optima CT680</p></section></section></section><section powered-by="gulangu"><section><section><p><br  /></p></section></section></section><section powered-by="gulangu"><section><section><p>安科的ANATOM 16 HD 多层螺旋CT：全球首款精准平台的高清16层CT，32排探测器，每排探测器单元数912个，信号提升25%，最大可视空间分辨率高达0.24mm。</p><p><br  /></p></section></section></section><section powered-by="gulangu"><section><section><p><img src="image/20201014/f1bfb7709077f497d998f9c4dab55c15_6.png" /></p></section></section></section><section powered-by="gulangu"><section><section><p>安科的ANATOM 16 HD 多层螺旋CT</p><p><br  /></p></section></section></section><section powered-by="gulangu"><section><section><p><br  /></p><p><span>这里需要注意的是：当探测器的排数多于层数的时候，可以选择不同层厚进行扫描。即在探测器DAS之间设有电子开关电路，开关被同步控制，用来选择Z轴方向上探测器的数目及组合，以此来控制扫描的厚度。（未被激发的探测器处于关闭状态）</span></p><p><br  /></p></section></section></section><section powered-by="gulangu"><section><section><p><img src="image/20201014/8889617bec7965eccd34c134d9697d0a_7.png" /></p></section></section></section><section powered-by="gulangu"><section><section><p><span>（飞利浦16层24排探测器阵列）</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/20201014/586254ee5326484b45e00bd294043d46_8.png" /></p></section></section></section><section powered-by="gulangu"><section><section><p><span>（东芝16层40排探测器阵列）</span><br  /></p></section></section></section><section powered-by="gulangu"><section><section><p><br  /></p></section></section></section><section powered-by="gulangu"><section><section><section powered-by="gulangu"><section><section><p><strong>DAS是什么？</strong></p></section></section></section></section></section></section><section powered-by="gulangu"><section><section><p><br  /></p><p>DAS即Data&nbsp;Acquisition&nbsp;System，是CT数据采集系统。它的作用是将探测器输出的微弱的电信号放大、积分、采样保持后经多路开关混合成若干路，经过A/D转换器把相应的人体组织的密度信息转变为数字信号送入计算机进行图像重建处理。</p></section></section></section><section powered-by="gulangu"><section><section><p><img src="image/20201014/c90753b19a1a61971058b0cc7ca77b82_9.jpg" /></p></section></section></section><section powered-by="gulangu"><section><section><p>看完这篇文章，大家是不是清楚了CT的“排”指的是探测器的数量而“层”是指DAS获取数据的能力呢？关于CT你还有什么想了解的，欢迎在下面留言哦~</p><p><br  /></p><p><strong><span>本文由原创，转载请注明出处</span></strong></p><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_10.gif" /></p></p><p><span>为什么多层螺旋CT能风靡世界20年？</span><br  /></p><p><br  /></p><p><span>医疗装备行业真正的价值到底在哪里？——专访东软医疗CEO武少杰</span><br  /></p><p><br  /></p><p><span>同档次CT，国产与进口的价格竟相差2倍？</span><br  /></p><p><br  /></p><p><span>国产CT厂商的崛起，让基层医院用得起64层CT！</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_11.jpg" /></p></p></section></section></section></section>