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<p style="white-space: normal;"><img class="rich_pages js_insertlocalimg" data-backh="117" data-backw="578" data-cropselx1="0" data-cropselx2="578" data-cropsely1="0" data-cropsely2="117" data-ratio="0.2015625" data-s="300,640" src="http://mmbiz.qpic.cn/mmbiz_jpg/dx3KibwtDhvdaoLyYB5XBZDWW5tA6THRq1aemdicXWypwZ4kriaz1lY37fcH7CuVpSdjhcpWCXoLcibzLx4gam6U2A/640?wx_fmt=jpeg" data-type="jpeg" data-w="1280" style="width: 100%;height: auto;" /><br /></p><section style="font-variant-numeric: normal;font-variant-east-asian: normal;max-width: 100%;line-height: 27.2px;widows: 1;background-color: rgb(255, 255, 255);box-sizing: border-box !important;overflow-wrap: break-word !important;"><section powered-by="gulangu" style="max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"><section style="max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"><section powered-by="gulangu"><section powered-by="gulangu"><section style="letter-spacing: 0.544px;white-space: normal;"><span style="font-size: 15px;"> </span><span style="font-size: 15px;letter-spacing: 0.544px;"> </span><span style="font-size: 15px;letter-spacing: 0.544px;"> </span><span style="font-size: 15px;letter-spacing: 0.544px;">Vivid Five是GE公司在2002年推出的一款高档全数字彩色多普勒超声诊断系统，该</span><span style="font-size: 15px;letter-spacing: 0.544px;">机具有优异的图像质量和强大的处理功</span><span style="font-size: 15px;letter-spacing: 0.544px;">能，具有无创、简便、快速诊断的优点，对各种复杂疾病的诊断尤其是心血管疾病诊断具有重要辅助作用。</span><span style="font-size: 15px;letter-spacing: 0.544px;">该机除可进行消化科、泌尿科、妇</span><span style="font-size: 15px;letter-spacing: 0.544px;">产科等疾病的常规超声诊断外，还可进行心脏、血管、浅表脏器等全身多脏器疾病的彩色多普勒超声诊断，并能应用经阴道超声探头对妇产科疾病特别是子宫内膜疾病做出更准确的诊断，尤其是对各种复</span><span style="font-size: 15px;letter-spacing: 0.544px;">杂的心脏疾病如复杂的先天性心脏病、心肌病等的诊断具有重大的诊断价值。</span></section><p style="letter-spacing: 0.544px;white-space: normal;margin-top: 10px;"><strong><span style="font-size: 15px;">1.故障现象</span></strong></p><section><span style="letter-spacing: 0.544px;font-size: 15px;"> 机器能够正常启动，在选用相控阵探头（FPA 2.5MHz）时，在图像区域没有始波，只有噪声，无法进行超声扫描诊断。监视器上的图像如图 1所示。</span></section><section><span style="letter-spacing: 0.544px;font-size: 15px;"> 再切换到线阵探头（FLA 10MHz），在图像区域有始波，但只有正常情况下的1/3左右，中、远场部分没有回波。增大增益，噪声随之增多，无法进行临床诊断。监视器上的图像如图 2所示。</span></section><p style="letter-spacing: 0.544px;white-space: normal;text-align: center;margin-top: 5px;margin-bottom: 5px;"><img border="0" data-ratio="0.8" src="http://mmbiz.qpic.cn/mmbiz_jpg/dx3KibwtDhvfibzMQU1GSIAhAtFOGCTCM1SQkhmuibFsZLtNCfVBiclDRoF2AX7SgZayjcLw7IM8zvuIiaunRibZk7HA/640?wx_fmt=jpeg" data-type="jpeg" data-w="400" height="28" style="overflow-wrap: break-word;cursor: pointer;color: rgb(68, 68, 68);font-family: Tahoma, Helvetica, SimSun, sans-serif;font-size: 14px;text-align: start;white-space: normal;background-color: rgb(255, 255, 255);width: 100%;height: auto;" data-backw="400" data-backh="320" /><br style="overflow-wrap: break-word;color: rgb(68, 68, 68);font-family: Tahoma, Helvetica, SimSun, sans-serif;font-size: 14px;text-align: start;white-space: normal;background-color: rgb(255, 255, 255);" /><span style="font-size: 12px;color: rgb(136, 136, 136);">图 1 使用心脏探头时的故障图像</span></p><p style="letter-spacing: 0.544px;white-space: normal;text-align: center;margin-top: 5px;margin-bottom: 5px;"><img border="0" data-ratio="0.8" src="http://mmbiz.qpic.cn/mmbiz_jpg/dx3KibwtDhvfibzMQU1GSIAhAtFOGCTCM1CzCqPiat47UxHRnVYPOVlicibnX7SX2TV57LaVyOCIJMB1ZMBU7xgae4Q/640?wx_fmt=jpeg" data-type="jpeg" data-w="400" height="28" style="overflow-wrap: break-word;cursor: pointer;color: rgb(68, 68, 68);font-family: Tahoma, Helvetica, SimSun, sans-serif;font-size: 14px;text-align: start;white-space: normal;background-color: rgb(255, 255, 255);width: 100%;height: auto;" data-backw="400" data-backh="320" /><br style="overflow-wrap: break-word;color: rgb(68, 68, 68);font-family: Tahoma, Helvetica, SimSun, sans-serif;font-size: 14px;text-align: start;white-space: normal;background-color: rgb(255, 255, 255);" /><span style="font-size: 12px;color: rgb(136, 136, 136);">图 2 使用线阵探头时的故障图像</span></p><p style="letter-spacing: 0.544px;white-space: normal;text-align: left;text-indent: 0em;margin-top: 10px;"><strong><span style="font-size: 15px;">2.分析检修</span></strong></p><section style="letter-spacing: 0.544px;white-space: normal;text-align: left;text-indent: 0em;"><span style="font-size: 15px;"> 根据故障现象分析判断，怀疑系统的超声发射部分存在故障。</span><span style="font-size: 15px;">影响超声波的产生和发射的部件主要包括：</span><span style="font-size: 15px;">探头、通道板、发射板、前端控制板和高压电源，因此需要逐步检查，进一步缩小故障范围。</span></section><section style="letter-spacing: 0.544px;white-space: normal;text-align: left;text-indent: 0em;"><span style="font-size: 15px;"> 首先，检查探头是否正常。</span><span style="font-size: 15px;">将探头拔下，插入另外一个插座，然后看探头的切换是否正常。</span><span style="font-size: 15px;">经检查，探头的切换正常，故障现象依旧。</span><span style="font-size: 15px;">这说明，探头、通道板这部分运行正常。</span></section><section style="letter-spacing: 0.544px;white-space: normal;text-align: left;text-indent: 0em;"><span style="font-size: 15px;"> 接着，再检查发射脉冲触发信号，结果正常。</span><span style="font-size: 15px;">当检测高压电源时，结果发现+/- 80V电源没有输出。</span><span style="font-size: 15px;">这说明，高压电源存在故障。</span></section><section style="letter-spacing: 0.544px;white-space: normal;text-align: left;text-indent: 0em;"><span style="font-size: 15px;"> 高压电源故障，将导致发射板无法产生超声波脉冲输出，也就无法有始波图像显示。</span></section><p style="letter-spacing: 0.544px;white-space: normal;text-align: left;text-indent: 0em;margin-top: 10px;"><strong><span style="font-size: 15px;">3.故障排除</span></strong></p><section style="letter-spacing: 0.544px;white-space: normal;text-align: left;text-indent: 0em;"><span style="font-size: 15px;"> 从机箱将高压电源模块取出，打开金属外壳，使用万用表进行检测发现，有两个保险管已经烧断，说明高压电源内部有短路故障。</span><span style="font-size: 15px;">经过测量，发现有两个三极管发生短路击穿。</span><span style="font-size: 15px;">更换同样规格的三极管和保险管，短路故障排除。</span><span style="font-size: 15px;">将高压电源模块装入机器后，开机运行，系统恢复正常。</span></section><section style="letter-spacing: 0.544px;white-space: normal;text-align: left;text-indent: 0em;"><span style="font-size: 15px;"><br style="overflow-wrap: break-word;text-align: start;white-space: normal;background-color: rgb(255, 255, 255);" /><strong>4.心得体会</strong></span></section><section style="letter-spacing: 0.544px;white-space: normal;text-align: left;text-indent: 0em;"><span style="letter-spacing: 0.544px;text-indent: 2em;font-size: 15px;"> B超的维修是精密复杂的工程。</span><span style="letter-spacing: 0.544px;text-indent: 2em;font-size: 15px;">首先必须对设备的工作原理有一定程度的了解，然后根据故障现象，逐步缩小故障的范围，最终定位到一个故障部件。</span><span style="letter-spacing: 0.544px;text-indent: 2em;font-size: 15px;">然后，针对故障部件进行详细的检查和分析，找出失效或故障元件。</span></section><p style="letter-spacing: 0.544px;white-space: normal;text-align: left;text-indent: 2em;"><span style="font-size: 15px;"></span></p><section style="letter-spacing: 0.544px;white-space: normal;text-align: left;text-indent: 0em;"><span style="color: rgb(136, 136, 136);font-size: 12px;">[参考文献]<br style="overflow-wrap: break-word;color: rgb(68, 68, 68);font-family: Tahoma, Helvetica, SimSun, sans-serif;font-size: 14px;text-align: start;white-space: normal;background-color: rgb(255, 255, 255);" />[1] 《GE Vivid Five Basic Service Manual》</span></section></section></section></section></section></section><p style="font-variant-numeric: normal;font-variant-east-asian: normal;white-space: normal;max-width: 100%;min-height: 1em;font-family: -apple-system-font, BlinkMacSystemFont, "Helvetica Neue", " ingFang SC", "Hiragino Sans GB", "Microsoft YaHei UI", "Microsoft YaHei", Arial, sans-serif;letter-spacing: 0.544px;widows: 1;font-size: 16px;text-align: center;background-color: rgb(255, 255, 255);box-sizing: border-box !important;overflow-wrap: break-word !important;"><span style="max-width: 100%;font-size: 12px;box-sizing: border-box !important;overflow-wrap: break-word !important;">-end-</span><br style="max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;" /></p><p style="font-variant-numeric: normal;font-variant-east-asian: normal;white-space: normal;max-width: 100%;min-height: 1em;font-family: -apple-system-font, BlinkMacSystemFont, "Helvetica Neue", "ingFang SC", "Hiragino Sans GB", "Microsoft YaHei UI", "Microsoft YaHei", Arial, sans-serif;letter-spacing: 0.544px;widows: 1;font-size: 16px;text-align: center;background-color: rgb(255, 255, 255);box-sizing: border-box !important;overflow-wrap: break-word !important;"><span style="max-width: 100%;font-size: 12px;box-sizing: border-box !important;overflow-wrap: break-word !important;">部分图片来源于网络，如有侵权，请联系小编进行删除</span></p><p style="font-variant-numeric: normal;font-variant-east-asian: normal;white-space: normal;max-width: 100%;min-height: 1em;font-family: -apple-system-font, BlinkMacSystemFont, "Helvetica Neue", "ingFang SC", "Hiragino Sans GB", "Microsoft YaHei UI", "Microsoft YaHei", Arial, sans-serif;letter-spacing: 0.544px;widows: 1;font-size: 16px;text-align: center;background-color: rgb(255, 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发表于 2020-10-19 22:39:34