磁共振设备安装调试过程中的不常见故障与对策

Unfamiliar Artifacts and Elimination of MRI Installation and Adjustment

目的:探讨磁共振设备安装调试过程中几种不常见伪影的成因与消除方法。方法:回顾性分析了近三年来i_Open 0.36T磁共振设备安装调试过程中遇到的困难问题和不常见伪影,分析其图象表现和干扰来源,给出了改善方案。结果:干扰来源:外部(屏蔽门没有关严导致外界射频干扰进入磁体空间);屏蔽室内照明灯、激光定位灯;射频、梯度线圈(发热后绝缘材料性能降低后的瞬时放电);冷却系统部件(特别是水管接头);信号采集的模拟电路(放大器、连线、滤波板);信号采集后的数字电路(ADC等,不可测因素较少)。结论:本文列举故障的排除虽简单,但寻找故障的原因可能耗费大量的时间。在此整理分析,供广大同仁参考。以期在磁共振设备的安装调试时,提高效率,保证质量,更好为医院和患者服务。

Objective： 5 examples of unfamiliar artifacts of 0.36T MRI at past 3 years presented, and the reason and solution were analysed. Result： The result shows that the main interference is from：a. External （not related to strict platform screen doors lead outside RF interference into the magnet space）;b, indoor lights, laser positioning lights; RF and gradient coils （heat insulation material properties decreased after the instantaneous discharge）;c. Cooling system components （especially water mains connector）; signal acquisition of analog circuits （amplifiers, connect ware, filter plate）;d. Digital Circuit （ADC, imponderables less）. Conclusion： We expect the work is benefit to magnetic resonance practitioners.