SuperMark 1.5T MR维修案例三

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                    <p><p><img src="image/20201019/1bd08b695d5fd805cb63ee05a2610294_1.jpg" /></p></p><p>&nbsp; &nbsp;</p><p><audio src="audio/202010/1603070556870.mp3" controls="controls"></audio></p><p><strong><span>&nbsp;设备名称：MR1.5T&nbsp;</span></strong></p><p><strong><span>&nbsp;时间：2018.4</span></strong></p><p><strong><span>地点：gz</span></strong></p><p><strong><span><br  /></span></strong></p><p><strong><span>&nbsp;一.故障现象：</span></strong><strong><span>&nbsp;</span></strong><strong><span>&nbsp;</span></strong><span>安装结束后，扫描球形水膜（170）定位相，有干扰类似拉连装的artifact</span></p><p><strong><span><br  /></span></strong></p><p><span><strong>二 故障排查：</strong></span><strong>&nbsp;</strong><span>a.检查是否是电源电缆对 信号线的干扰，梳理电源线，避开与信号线接触，因为数据传输采用的是同轴电缆，而非是光纤。</span></p><p><span>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; b.检查磁体室内的24v直流灯 对信号线干扰，关掉电源，扫描测试 &nbsp;</span></p><p><span><span>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;c.检查</span><span>检查传导屏蔽孔，用铜纸将所有有孔有份的地方全部重新填补。测试故障依旧。</span></span></p><p><br  /></p><p><span>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; d.理论分析，应该还是信号在传输的某个环节受到了干扰，接收系统 线圈接收信号到16通道数据接收，到传到版，再到普仪，普仪到梯度功放，梯度线圈。检查各个环节线路。插拔测试。</span></p><p><span><span>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;1.将单独的射频关掉，设置后，扫描测试，有干扰，排除了RF</span></span></p><p><strong><span>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;</span></strong><span> &nbsp;2.将梯度关掉，RF开，扫描测试，无干扰。说明问题在梯度功放这一块。</span></p><p><span>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;3.检查梯度和evo之间的线，断开evo这段，测试有干扰，俩头都断开，无干扰，说明线有问题，梯度功放把干扰电流放大了，导致了故障的发生</span></p><p><span><strong><span>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;</span></strong></span></p><p><p><img src="image/20201019/0db89ff56e8d7e359af60e19c090dce4_2.png" /></p></p><p><span><strong><span> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;</span></strong></span></p><p><span><strong><span>&nbsp;三 故障解决：</span></strong></span><strong><span>&nbsp; &nbsp;</span></strong><span><span>处理梯度信号线，更换梯度信号线，故障消除</span></span></p><p><span>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp;</span></p><p><strong><span>四 &nbsp;总结</span></strong><span>：。。。。。。。。in &nbsp;my head</span></p><p><span><strong><span><br  /></span></strong></span></p><p><span><strong><span></span></strong></span></p><p><p><img src="image/20201019/00ee6d2cc6b1fb297f8aea2bfcc30ceb_3.png" /></p></p><p><span><strong><span></span></strong></span><br  /></p><p><span><strong><span>&nbsp; &nbsp; &nbsp;&nbsp;</span></strong></span></p><p><span><strong><span>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;</span></strong></span></p><p><span></span></p><p><p><img src="image/20201019/7822a4e2249e86a45760fbbfc1675e38_4.gif" /></p></p><p><br  /></p><p>&nbsp; &nbsp;&nbsp;</p><p>&nbsp;</p>