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</div> <!--[diy=diysummarybottom]--><div id="diysummarybottom" class="area"></div><!--[/diy]--> <div class="d"> <!--[diy=diycontenttop]--><div id="diycontenttop" class="area"></div><!--[/diy]--> <table cellpadding="0" cellspacing="0" class="vwtb"><tr><td id="article_content"><P>X光机是产生X光的设备，其主要由X光管和X光<a href="http://machine.oecr.com" target="_blank" class="relatedlink">机电</a>源组成，而X光管又由阴极灯丝 （Cathod）和阳极靶（Anode）以及真空玻璃管组成，X光机电源又可分为高压电源和灯丝电源两部分，其中灯丝电源用于为灯丝加热，高压电源的高压输出端分别家在阴极灯丝和阳极靶两端，提供一个高压电场使灯丝上活跃的<a href="http://electronic.oecr.com" target="_blank" class="relatedlink">电子</a>加速流向阳极靶，形成一个高速的电子流，X光的产生方式有两种：制动辐射（Bremsstrahlung）和特性辐射（Characteristic）。制动辐射：高速电子突然减速后，其动能以X光的形式释放出来；特性辐射： 高速电子撞击原子和外围轨道上电子，使之游离且释放出能量，这种能量即X光。</P> <P>自 1895 年伦琴发现 X 射线并摄取第一张 X 光片以来，X 射线在医学领域的应用至今已有 100 余年的历史。其间的发展可大致分为三个阶段。</P> <P>第一阶段约在 20 世纪70 年代以前，X 光管球由固定阳极发展为旋转阳极，由中速发展至高速，靶及灯丝<a href="http://material.oecr.com" target="_blank" class="relatedlink">材料</a>的不断改进，使得 X 光管球的热容量越来越大，体积越来越小，各项<a href="http://optics.oecr.com" target="_blank" class="relatedlink">工艺</a>技术极为成熟。高压发生装置由<a href="http://machine.oecr.com" target="_blank" class="relatedlink">机械</a>控制模式发展为电子管控制并进化成<a href="http://material.oecr.com" target="_blank" class="relatedlink">晶体</a>管控制。成像为增感屏—胶片模式，同样经历过慢速、中速、高速的发展过程，透视及摄影剂量变得越来越小。这一阶段的特点可概括为工频 50／60 H z，增感屏—胶片。</P> <P>第二阶段为 70—90 年代约 20 年内。首先是 X 射线影像增强器的出现，使得 X 射线电视系统成为现实。其次是现代电子计算机技术的发展，使人们对图像可进行存储、处理，DSA 技术出现。最后是大功率高频可控硅的出现，使得高压发生器的工作频率由 50／60 H z发展到 10 kH z左右，随着频率的提高，高压发生器的体积得以大幅减小，实现了脉冲曝光。这一阶段可概括为 DSA，高频可控硅。</P> <P>第三阶段为 90 年代至今，这一阶段是 X 光机发展最为迅快的时期。由于大功率高频功率模块的应用，如 IG-BT、IPM 、GTR 及大功率 CM OS 模块使得高压发生器的工作频率达到 20～100kH z，进入无声时代。图像采集方面，出现 l249 线高扫电视系统，充气电离室探测器阵列，多丝正比探测器阵列，<a href="http://sensor.oecr.com" target="_blank" class="relatedlink">半导体</a>光敏探测器阵列，后四种方式抛弃了传统的增感屏—胶片组合，完成了直接数字摄影。并且随着计算机的处理速度越来越快及计算机图像处理技术的成熟，实时处理的 DSA 成为现实。这一时期可概括为无声的数字化时代。</P></td></tr></table> <!--[diy=diycontentbottom]--><div id="diycontentbottom" class="area"></div><!--[/diy]--> <script src="data/cache/home.js?eOg" 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