飞利浦PHILIPS Eclipse 1.5T核磁共振故障维修方案

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                    <p style="margin-top: 0px; margin-bottom: 10px; padding: 0px; color: rgb(51, 51, 51); white-space: normal; background-color: rgb(255, 255, 255); font-family: 宋体; font-size: 12px;"><span style="font-size: 18px;"><strong style="line-height: 21px;">1、故障现象</strong></span></p><p style="margin-top: 0px; margin-bottom: 10px; padding: 0px; color: rgb(51, 51, 51); white-space: normal; background-color: rgb(255, 255, 255); font-family: 宋体; font-size: 12px;"><span style="font-size: 18px;">不能扫描1.1时而找不到中心频率。</span></p><p style="margin-top: 0px; margin-bottom: 10px; padding: 0px; color: rgb(51, 51, 51); white-space: normal; background-color: rgb(255, 255, 255); font-family: 宋体; font-size: 12px;"><span style="font-size: 18px;"><br  /></span></p><p style="margin-top: 0px; margin-bottom: 10px; padding: 0px; color: rgb(51, 51, 51); white-space: normal; background-color: rgb(255, 255, 255); font-family: 宋体; font-size: 12px;"><span style="font-size: 18px;">扫描时。控制台提示无法完成射频校正的错误，有时会找不到中心频率。</span></p><p style="margin-top: 0px; margin-bottom: 10px; padding: 0px; color: rgb(51, 51, 51); white-space: normal; background-color: rgb(255, 255, 255); font-family: 宋体; font-size: 12px;"><span style="font-size: 18px;"><br  /></span></p><p style="margin-top: 0px; margin-bottom: 10px; padding: 0px; color: rgb(51, 51, 51); white-space: normal; background-color: rgb(255, 255, 255); font-family: 宋体; font-size: 12px;"><span style="font-size: 18px;">提示检查。射频功放状态，受检部位是否在等中心。线圈连接是否正常;选择的线圈模式;并在控制柜上显示Y轴梯度场控制点喽位180.4A 图显示的控制台的错误提示)</span></p><p style="margin-top: 0px; margin-bottom: 10px; padding: 0px; color: rgb(51, 51, 51); white-space: normal; background-color: rgb(255, 255, 255); font-family: 宋体; font-size: 12px;"><span style="font-size: 18px;">出现伪影1.2能扫描时。</span></p><p style="margin-top: 0px; margin-bottom: 10px; padding: 0px; color: rgb(51, 51, 51); white-space: normal; background-color: rgb(255, 255, 255); font-family: 宋体; font-size: 12px;"><span style="font-size: 18px;"><strong style="line-height: 21px;"><br  /></strong></span></p><p style="margin-top: 0px; margin-bottom: 10px; padding: 0px; color: rgb(51, 51, 51); white-space: normal; background-color: rgb(255, 255, 255); font-family: 宋体; font-size: 12px;"><span style="font-size: 18px;"><strong style="line-height: 21px;">2、故障分析及处理</strong></span></p><p style="margin-top: 0px; margin-bottom: 10px; padding: 0px; color: rgb(51, 51, 51); white-space: normal; background-color: rgb(255, 255, 255); font-family: 宋体; font-size: 12px;"><span style="font-size: 18px;">　　</span></p><p style="margin-top: 0px; margin-bottom: 10px; padding: 0px; color: rgb(51, 51, 51); white-space: normal; background-color: rgb(255, 255, 255); font-family: 宋体; font-size: 12px;"><span style="font-size: 18px;">2.1 怀疑Y轴梯度场回路出现问题</span></p><p style="margin-top: 0px; margin-bottom: 10px; padding: 0px; color: rgb(51, 51, 51); white-space: normal; background-color: rgb(255, 255, 255); font-family: 宋体; font-size: 12px;"><span style="font-size: 18px;">　　</span></p><p style="margin-top: 0px; margin-bottom: 10px; padding: 0px; color: rgb(51, 51, 51); white-space: normal; background-color: rgb(255, 255, 255); font-family: 宋体; font-size: 12px;"><span style="font-size: 18px;">根据1.1故障现象。导致磁场中心偏移而不能找到共振信号，不扫描时Y轴梯度场的电流为180.4A 故首先怀疑Y轴梯度场不受控。关掉所有梯度控制，并通过手动扫描方式进行逐一打开，发现在打开Y轴梯度场时，共振信号消失，说明不能扫描时有Y轴梯度场引起的</span></p><p style="margin-top: 0px; margin-bottom: 10px; padding: 0px; color: rgb(51, 51, 51); white-space: normal; background-color: rgb(255, 255, 255); font-family: 宋体; font-size: 12px;"><span style="font-size: 18px;">　　</span></p><p style="margin-top: 0px; margin-bottom: 10px; padding: 0px; color: rgb(51, 51, 51); white-space: normal; background-color: rgb(255, 255, 255); font-family: 宋体; font-size: 12px;"><span style="font-size: 18px;">将Y轴梯度线圈与Z轴梯度线圈交换。发现仍旧在打开Y梯度控制时共振信号消失。说明Y轴梯度线圈没有问题，偏重新做手动扫描。应该是有Y轴梯度场的控制回路出现问题。</span></p><p style="margin-top: 0px; margin-bottom: 10px; padding: 0px; color: rgb(51, 51, 51); white-space: normal; background-color: rgb(255, 255, 255); font-family: 宋体; font-size: 12px;"><span style="font-size: 18px;">　　</span></p><p style="margin-top: 0px; margin-bottom: 10px; padding: 0px; color: rgb(51, 51, 51); white-space: normal; background-color: rgb(255, 255, 255); font-family: 宋体; font-size: 12px;"><span style="font-size: 18px;">Y轴梯度场的控制主要时Channel板。更换后使用一段时间故障依旧;然后奉还DA C板，DA C板以及梯度功放这三局部硬件组成。先怀疑梯度功放。Y梯度电流消失，液就是说1.1中的故障现象消失。但是1.2中的伪影故障还是没有消除。说明引起伪影的故障不只仅是只有Y轴梯度场叠加导致磁场中心偏离这一原因，氦应该存在其他原因。</span></p><p style="margin-top: 0px; margin-bottom: 10px; padding: 0px; color: rgb(51, 51, 51); white-space: normal; background-color: rgb(255, 255, 255); font-family: 宋体; font-size: 12px;"><span style="font-size: 18px;">　　</span></p><p style="margin-top: 0px; margin-bottom: 10px; padding: 0px; color: rgb(51, 51, 51); white-space: normal; background-color: rgb(255, 255, 255); font-family: 宋体; font-size: 12px;"><span style="font-size: 18px;">2.2 还是射频场回路出现问题</span></p><p style="margin-top: 0px; margin-bottom: 10px; padding: 0px; color: rgb(51, 51, 51); white-space: normal; background-color: rgb(255, 255, 255); font-family: 宋体; font-size: 12px;"><span style="font-size: 18px;">　　</span></p><p style="margin-top: 0px; margin-bottom: 10px; padding: 0px; color: rgb(51, 51, 51); white-space: normal; background-color: rgb(255, 255, 255); font-family: 宋体; font-size: 12px;"><span style="font-size: 18px;">考虑1.2中引起伪影原因。还有射频场也可引起伪影，除了梯度场外。故检查射频场回路。射频场回路由Exciter板，RF功放板以及发射线圈组成。先怀疑RF功放板，更换后故障现象消失，扫描图像正常。说明故障由RF功放引起的</span></p><p style="margin-top: 0px; margin-bottom: 10px; padding: 0px; color: rgb(51, 51, 51); white-space: normal; background-color: rgb(255, 255, 255); font-family: 宋体; font-size: 12px;"><span style="font-size: 18px;">　　</span></p><p style="margin-top: 0px; margin-bottom: 10px; padding: 0px; color: rgb(51, 51, 51); white-space: normal; background-color: rgb(255, 255, 255); font-family: 宋体; font-size: 12px;"><span style="font-size: 18px;"><strong style="line-height: 21px;">3、故障总结、</strong></span></p><p style="margin-top: 0px; margin-bottom: 10px; padding: 0px; color: rgb(51, 51, 51); white-space: normal; background-color: rgb(255, 255, 255); font-family: 宋体; font-size: 12px;"><span style="font-size: 18px;">　　</span></p><p style="margin-top: 0px; margin-bottom: 10px; padding: 0px; color: rgb(51, 51, 51); white-space: normal; background-color: rgb(255, 255, 255); font-family: 宋体; font-size: 12px;"><span style="font-size: 18px;">通过1.1中的故障分析和处理后，可以知道由于DA C板的不稳定，导致Y轴梯度场控制的不稳定，使磁场中心偏移而不能找到共振信号</span></p><p style="margin-top: 0px; margin-bottom: 10px; padding: 0px; color: rgb(51, 51, 51); white-space: normal; background-color: rgb(255, 255, 255); font-family: 宋体; font-size: 12px;"><span style="font-size: 18px;">　　</span></p><p style="margin-top: 0px; margin-bottom: 10px; padding: 0px; color: rgb(51, 51, 51); white-space: normal; background-color: rgb(255, 255, 255); font-family: 宋体; font-size: 12px;"><span style="font-size: 18px;">对于1.2中的故障分析和处理。图像会出现严重的条文状伪影;射频功放输出功率下降时，可以知道射频功放输出不稳定时。则会导致图像信噪比降低。</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="word-wrap: break-word !important; 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