SPECT-CT 常见故障及解决办法

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                    <p style=""><span style="margin: 0px; padding: 0px; max-width: 100%; color: rgb(31, 73, 125); box-sizing: border-box !important; word-wrap: break-word !important;"><strong style="margin: 0px; padding: 0px; max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">1、故障现象一：机器自检，提示CONTOUR FAIL。   </strong></span>  <br style="margin: 0px; padding: 0px; max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;"  /><br style="margin: 0px; padding: 0px; max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;"  /></p><p style=""><span style="margin: 0px; padding: 0px; max-width: 100%; color: rgb(31, 73, 125); box-sizing: border-box !important; word-wrap: break-word !important;">分析与检修：</span>contour是人体轨迹功能，检查时，探头能根据病人的身体曲线，尽可能近地贴近病人，尽可能大地消除干扰，更精确地定位核素放射信号，从而使成像清晰度提高，定位更准确。 <span style="margin: 0px; padding: 0px; max-width: 100%; line-height: 1.5em; box-sizing: border-box !important; word-wrap: break-word !important;">     </span></p><p style="">此故障出现，机器一般仍能工作，但是对图像清晰度影响很大，严重影响诊断的准确性。查阅相关资料和对照实物，我们分析出此功能的工作原理。每个探头两侧各有20个小孔，一排是红外发射二极管，另一排是红外接收二极管，探头就是根据人体对红外光线的遮挡，来探测人体轨迹。5V供电电源位于探头内部，探测信号经电缆P303传输到BEC板，然后经电缆P14传到MCH板。由MCH板控制探头的运动。依次检查供电电源、BEC板、MCH板、接插件、电缆等，最后确定为BEC板故障。检查BEC板负责相应功能的元件，发现限流熔断器F8烧断，检查后级元器件，没有短路发生，用万用表串接检测电路电流为12mA，无异常，换上20mA左右熔断器替代，数月之后，至今仍然正常工作。      <br style="margin: 0px; padding: 0px; max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;"  /><br style="margin: 0px; padding: 0px; max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;"  /></p><p style=""><span style="margin: 0px; padding: 0px; max-width: 100%; color: rgb(31, 73, 125); box-sizing: border-box !important; word-wrap: break-word !important;"><strong style="margin: 0px; padding: 0px; max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">2、故障现象二：机器开机自检，电脑屏幕提示HEAD2 ERROR信息，然后机架死机。做gantry reset数次，故障现象不变。</strong></span> </p><p style=""><br style="margin: 0px; padding: 0px; max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;"  /><span style="margin: 0px; padding: 0px; max-width: 100%; line-height: 1.5em; color: rgb(31, 73, 125); box-sizing: border-box !important; word-wrap: break-word !important;">分析与检修：</span><span style="margin: 0px; padding: 0px; max-width: 100%; line-height: 1.5em; box-sizing: border-box !important; word-wrap: break-word !important;">SPECT</span><span style="margin: 0px; padding: 0px; max-width: 100%; line-height: 1.5em; box-sizing: border-box !important; word-wrap: break-word !important;">每个探头内，共有</span><span style="margin: 0px; padding: 0px; max-width: 100%; line-height: 1.5em; box-sizing: border-box !important; word-wrap: break-word !important;">5</span><span style="margin: 0px; padding: 0px; max-width: 100%; line-height: 1.5em; box-sizing: border-box !important; word-wrap: break-word !important;">块电路板，</span><span style="margin: 0px; padding: 0px; max-width: 100%; line-height: 1.5em; box-sizing: border-box !important; word-wrap: break-word !important;">1</span><span style="margin: 0px; padding: 0px; max-width: 100%; line-height: 1.5em; box-sizing: border-box !important; word-wrap: break-word !important;">块</span><span style="margin: 0px; padding: 0px; max-width: 100%; line-height: 1.5em; box-sizing: border-box !important; word-wrap: break-word !important;">DOC(data organizerand controller)</span><span style="margin: 0px; padding: 0px; max-width: 100%; line-height: 1.5em; box-sizing: border-box !important; word-wrap: break-word !important;">板，</span><span style="margin: 0px; padding: 0px; max-width: 100%; line-height: 1.5em; box-sizing: border-box !important; word-wrap: break-word !important;">2</span><span style="margin: 0px; padding: 0px; max-width: 100%; line-height: 1.5em; box-sizing: border-box !important; word-wrap: break-word !important;">块</span><span style="margin: 0px; padding: 0px; max-width: 100%; line-height: 1.5em; box-sizing: border-box !important; word-wrap: break-word !important;">ADAM(analog</span><span style="margin: 0px; padding: 0px; max-width: 100%; line-height: 1.5em; box-sizing: border-box !important; word-wrap: break-word !important;">／</span><span style="margin: 0px; padding: 0px; max-width: 100%; line-height: 1.5em; box-sizing: border-box !important; word-wrap: break-word !important;">digitd acquisition module)</span><span style="margin: 0px; padding: 0px; max-width: 100%; line-height: 1.5em; box-sizing: border-box !important; word-wrap: break-word !important;">板，</span><span style="margin: 0px; padding: 0px; max-width: 100%; line-height: 1.5em; box-sizing: border-box !important; word-wrap: break-word !important;">1</span><span style="margin: 0px; padding: 0px; max-width: 100%; line-height: 1.5em; box-sizing: border-box !important; word-wrap: break-word !important;">块</span><span style="margin: 0px; padding: 0px; max-width: 100%; line-height: 1.5em; box-sizing: border-box !important; word-wrap: break-word !important;">BEC</span><span style="margin: 0px; padding: 0px; max-width: 100%; line-height: 1.5em; box-sizing: border-box !important; word-wrap: break-word !important;">板，</span><span style="margin: 0px; padding: 0px; max-width: 100%; line-height: 1.5em; box-sizing: border-box !important; word-wrap: break-word !important;">1</span><span style="margin: 0px; padding: 0px; max-width: 100%; line-height: 1.5em; box-sizing: border-box !important; word-wrap: break-word !important;">块电源板</span><span style="margin: 0px; padding: 0px; max-width: 100%; line-height: 1.5em; box-sizing: border-box !important; word-wrap: break-word !important;">(</span><span style="margin: 0px; padding: 0px; max-width: 100%; line-height: 1.5em; box-sizing: border-box !important; word-wrap: break-word !important;">光电倍增管上的小控制板未计算在内</span><span style="margin: 0px; padding: 0px; max-width: 100%; line-height: 1.5em; box-sizing: border-box !important; word-wrap: break-word !important;">)</span><span style="margin: 0px; padding: 0px; max-width: 100%; line-height: 1.5em; box-sizing: border-box !important; word-wrap: break-word !important;">。探测器</span><span style="margin: 0px; padding: 0px; max-width: 100%; line-height: 1.5em; box-sizing: border-box !important; word-wrap: break-word !important;">PMT</span><span style="margin: 0px; padding: 0px; max-width: 100%; line-height: 1.5em; box-sizing: border-box !important; word-wrap: break-word !important;">紧贴碘化钠晶体呈蜂窝状排列。辐射信号轰击晶体，产生光子，被</span><span style="margin: 0px; padding: 0px; max-width: 100%; line-height: 1.5em; box-sizing: border-box !important; word-wrap: break-word !important;">PMT</span><span style="margin: 0px; padding: 0px; max-width: 100%; line-height: 1.5em; box-sizing: border-box !important; word-wrap: break-word !important;">扑捉、放大，以电流的形式提供给</span><span style="margin: 0px; padding: 0px; max-width: 100%; line-height: 1.5em; box-sizing: border-box !important; word-wrap: break-word !important;">ADAM</span><span style="margin: 0px; padding: 0px; max-width: 100%; line-height: 1.5em; box-sizing: border-box !important; word-wrap: break-word !important;">板，数字化处理后传递给</span><span style="margin: 0px; padding: 0px; max-width: 100%; line-height: 1.5em; box-sizing: border-box !important; word-wrap: break-word !important;">DOC</span><span style="margin: 0px; padding: 0px; max-width: 100%; line-height: 1.5em; box-sizing: border-box !important; word-wrap: break-word !important;">板。两个探头内的信号经</span><span style="margin: 0px; padding: 0px; max-width: 100%; line-height: 1.5em; box-sizing: border-box !important; word-wrap: break-word !important;">DOC</span><span style="margin: 0px; padding: 0px; max-width: 100%; line-height: 1.5em; box-sizing: border-box !important; word-wrap: break-word !important;">组织，传递给旋转机架内的</span><span style="margin: 0px; padding: 0px; max-width: 100%; line-height: 1.5em; box-sizing: border-box !important; word-wrap: break-word !important;">POP(position processor)</span><span style="margin: 0px; padding: 0px; max-width: 100%; line-height: 1.5em; box-sizing: border-box !important; word-wrap: break-word !important;">板，这些信息再以</span><span style="margin: 0px; padding: 0px; max-width: 100%; line-height: 1.5em; box-sizing: border-box !important; word-wrap: break-word !important;">80M</span><span style="margin: 0px; padding: 0px; max-width: 100%; line-height: 1.5em; box-sizing: border-box !important; word-wrap: break-word !important;">／</span><span style="margin: 0px; padding: 0px; max-width: 100%; line-height: 1.5em; box-sizing: border-box !important; word-wrap: break-word !important;">s</span><span style="margin: 0px; padding: 0px; max-width: 100%; line-height: 1.5em; box-sizing: border-box !important; word-wrap: break-word !important;">的速度经</span><span style="margin: 0px; padding: 0px; max-width: 100%; line-height: 1.5em; box-sizing: border-box !important; word-wrap: break-word !important;">FOX(front endtransceiver)</span><span style="margin: 0px; padding: 0px; max-width: 100%; line-height: 1.5em; box-sizing: border-box !important; word-wrap: break-word !important;">传输器，给静止机架的</span><span style="margin: 0px; padding: 0px; max-width: 100%; line-height: 1.5em; box-sizing: border-box !important; word-wrap: break-word !important;">SOREC(sta-tor optical data link receiver)</span><span style="margin: 0px; padding: 0px; max-width: 100%; line-height: 1.5em; box-sizing: border-box !important; word-wrap: break-word !important;">板，然后再与主控电脑及</span><span style="margin: 0px; padding: 0px; max-width: 100%; line-height: 1.5em; box-sizing: border-box !important; word-wrap: break-word !important;">MCH</span><span style="margin: 0px; padding: 0px; max-width: 100%; line-height: 1.5em; box-sizing: border-box !important; word-wrap: break-word !important;">、</span><span style="margin: 0px; padding: 0px; max-width: 100%; line-height: 1.5em; box-sizing: border-box !important; word-wrap: break-word !important;">ECLC</span><span style="margin: 0px; padding: 0px; max-width: 100%; line-height: 1.5em; box-sizing: border-box !important; word-wrap: break-word !important;">板交流信息。</span><span style="margin: 0px; padding: 0px; max-width: 100%; line-height: 1.5em; box-sizing: border-box !important; word-wrap: break-word !important;">      </span><br style="margin: 0px; padding: 0px; max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;"  /></p><p style="">从信息流程上判断，如果机器只报探头1或2错误，那么故障很可能就在其自身的电路上。重点检查ADAM,DOC及电源板，供电+lSV、HV,5V、-9V电压正常。每个探头内的2块ADAM板完全相同，DOC板也是一样的，可以通过互换法，缩小故障范围。互换排除后，确定为探头2的1块ADAM板有问题。细查板上元器件，发现限流电阻12阻值偏大，约50Ω，与标称值1Ω不符。再查其余二极管、三极管、电阻、电容等，无损坏。用集成电路测试仪检测各集成电路，未发现异常。用万用表串接，检测工作电流，直流0.1A，与另外几路电流完全相等。32个PMT将32路电流信号分为4组传给ADAM，每组8路，各有1个保险限流电阻，完全相同，所以可以对照。换用同型号电阻，正常工作至今。</p><p><span style="">郭晋纲  山西省肿瘤医院核医学科</span></p><p style=""><img src="http://mmbiz.qpic.cn/mmbiz/rz7R73cuHRrv6jdOCoJeZmYwvEAIoHpY0a7yJL2egiaEokLTpwkIsIRTzTFUic09aEThKHS4hrEcSqU0lAS3tu5g/0" data-ratio="0.14784394250513347" data-w="487" width="auto" width="auto" src="http://mmbiz.qpic.cn/mmbiz/rz7R73cuHRrv6jdOCoJeZmYwvEAIoHpY0a7yJL2egiaEokLTpwkIsIRTzTFUic09aEThKHS4hrEcSqU0lAS3tu5g/0?tp=webp" style="margin: 0px; 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border: 0px; color: rgb(255, 255, 255); font-weight: bold; font-size: 14px; border-top-left-radius: 5px; border-top-right-radius: 5px; border-bottom-right-radius: 5px; border-bottom-left-radius: 5px; background-color: rgb(0, 187, 236); box-sizing: border-box !important; word-wrap: break-word !important;"><span style="margin: 0px; padding: 0px; max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">复制上面微信号</span><img data-s="300,640" data-ratio="1.35" data-w="20" src="http://mmbiz.qpic.cn/mmbiz/A1DicCH9Vl6NE8iaIXiblrE1WKyXQz6qbATAS0VZxTKlGupjMMNvicoNs9vhvYGBr83wmsdO1ouTw7kVDibk9w6VoMg/0" class="" id="c6" width="auto" width="auto" src="http://mmbiz.qpic.cn/mmbiz/A1DicCH9Vl6NE8iaIXiblrE1WKyXQz6qbATAS0VZxTKlGupjMMNvicoNs9vhvYGBr83wmsdO1ouTw7kVDibk9w6VoMg/640?tp=webp" style="margin: 0px; padding: 0px; border: 0px; box-sizing: border-box !important; word-wrap: break-word !important; visibility: visible !important; width: auto !important;"  /><span style="margin: 0px; padding: 0px; max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">联系我哟</span></span></legend><blockquote style="padding: 0px; max-width: 100%; border: 0px; box-sizing: border-box !important; word-wrap: break-word !important;"><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; max-width: 100%; word-wrap: normal; min-height: 1em; white-space: pre-wrap; overflow: hidden; border: 0px; box-sizing: border-box !important;"><span style="margin: 0px; padding: 0px; max-width: 100%; border: 0px; color: rgb(255, 192, 0); font-size: 14px; box-sizing: border-box !important; word-wrap: break-word !important;"></span><span style="margin: 0px; padding: 0px; max-width: 100%; color: rgb(255, 192, 0); border: 0px; font-size: 14px; box-sizing: border-box !important; word-wrap: break-word !important;">? </span><span style="margin: 0px; padding: 0px; max-width: 100%; color: rgb(127, 127, 127); border: 0px; line-height: 28px; box-sizing: border-box !important; word-wrap: break-word !important;">定期推送</span><span style="margin: 0px; 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