SIEMENS Sensation Cardiac 64排螺旋CT滑环故障

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                    <p><p><img src="image/20201019/27c2bef2264902feeb2edb748387bf64_1.png" /></p></p><p><span><span>一.故障现象</span>:</span></p><p><span><span>&nbsp; &nbsp; 执行</span> “CHECH UP”<span>预热和校正程序时曝光中途停止，校正无法通过</span><span>; </span><span>定位扫描正常，螺旋扫描时系统自动退出，并伴有扫描控制盒上的扫描启动灯短暂鸣叫声</span><span>; </span><span>错误提示信息为</span><span>“See Event </span><span>－ </span><span>LOG”</span><span>。</span></span></p><p><span><span>二.故障分析和维修</span>:</span></p><p><span><span>&nbsp; &nbsp;从故障现象看，此故障的最大可能性来自滑环的通信异常。</span></span></p><p><span>&nbsp; &nbsp; &nbsp; Sensation Cardiac64 <span>滑环系统由 </span><span>15 </span><span>组滑环组成，由外到内排列顺序</span><span>: 1</span><span>、</span><span>2 </span><span>组为系统提供 </span><span>UDC 560V </span><span>直流电压</span><span>; </span><span>第</span><span>3</span><span>组为接地</span><span>; </span><span>第 </span><span>4</span><span>、</span><span>5 </span><span>组为 </span><span>DMS</span><span>、</span><span>DPU </span><span>提供 </span><span>230V </span><span>交流电压</span><span>; </span><span>第</span><span>6</span><span>、</span><span>7 </span><span>组在为高压系统提供所需的低压</span><span>( </span><span>如</span><span>: </span><span>球 管 灯 丝 变 压 器</span><span>) </span><span>的同时也为</span><span>DPU </span><span>提供</span><span>230V </span><span>交流电压</span><span>; </span><span>第 </span><span>8 </span><span>至 </span><span>15 </span><span>组滑环实</span><span>MCU/RTC</span><span>与 </span><span>ACU </span><span>之间的控制信号、系统信息传输。</span></span></p><p><span><span>&nbsp; 进入维修模式，显示错误信息为</span>: “CT_ RTC3031" “CT_ RTC 3052”<span>和 </span><span>“CT_ RTC 3039”</span><span>。</span></span></p><p><span><span>&nbsp; 此信息提示</span>: </span></p><p><span>&nbsp; &nbsp; &nbsp;(1) <span>旋转系统启动</span><span>20s </span><span>时间内，脉冲接收器没有接收到转速脉冲信号；</span></span></p><p><span>&nbsp; &nbsp; &nbsp;(2) <span>旋转系统用于评价角度脉冲的时间间隔和 </span><span>GANTRY </span><span>的平衡性的定位 </span><span>AP </span><span>脉冲数偏离</span><span>1200</span><span>。</span></span></p><p><span><span>为此进行如下操作</span>:</span></p><p><span>&nbsp; &nbsp; &nbsp; &nbsp; (1) <span>使用软件程序检查 </span><span>AP </span><span>脉冲情况</span><span>: </span><span>选择</span><span>OPTION </span><span>＞ </span><span>SERVICE </span><span>＞ － － － </span><span>CONTROLLER </span><span>＞</span><span>ACD </span><span>，设置扫描时间 </span><span>1s</span><span>，启动测试，系统检测失败。</span></span></p><p><span>&nbsp; &nbsp; &nbsp; &nbsp; (2) <span>检查扫描架内部</span><span>: </span><span>在静止模式下，手动转动 </span><span>GANTRY </span><span>使球管到达五个不同位置 </span><span>(0</span><span>、</span><span>90°</span><span>、</span><span>180°</span><span>、</span><span>270°</span><span>和</span><span>300°) </span><span>，维修软件表格自动显示各位置对应脉冲均正常。</span></span></p><p><span>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; (3) <span>检查碳刷长度正常</span><span>: </span><span>发现滑环表面有污物，使用蘸取无水酒精的医用纱布清理滑环，故障消失，机器恢复正常。</span><span>SIEMENS Sensation Cardiac 64 </span><span>螺旋 </span><span>CT </span><span>采用封闭式水冷和内置风冷方式。当附着于滑环上的污物导致旋转 </span><span>AP </span><span>脉冲的读出错误、控制数据错误，一旦系统检测 </span><span>AP </span><span>脉冲偏离达到 </span><span>1200 </span><span>时，认为旋转频率驱动器有问题，设备启动安全性停机保护。这是一起因污物附着滑环表面致使滑环碳刷接触不良，最终使数据、控制信号传输异常的故障。</span></span></p><p><span><br clear="all"  /></span></p><p><br  /></p>