磁共振伪影简介培训课件

GE Medical SystemsTraining in Partnership磁共振伪影简介GE Medical SystemsTraining in Partnership内容内容伪影分类.伪影产生的原因及解决方案.2磁共振伪影简介GE Medical SystemsTraining in Partnership内容内容伪影分类.伪影产生的原因及解决方案.3磁共振伪影简介GE Medical SystemsTraining in Partnership常见伪影常见伪影射频相关的伪影梯度相关的伪影主磁场相关的伪影图像处理相关的伪影患者相关的伪影操作者相关的伪影4磁共振伪影简介GE Medical SystemsTraining in Partnership射频相关伪影射频相关伪影周围环境的射频干扰汽车，电话，其他电动工具，高压注射器，灯丝在运行时也会产生电磁波，干扰磁共振的射频脉冲磁体间临近磁体间临近马路、停车场、地铁站伪影在相位方向上伪影的位置会随着带宽的增大而向图像中心移动必须找工程师解决5磁共振伪影简介GE Medical SystemsTraining in Partnership射频相关伪影射频相关伪影6磁共振伪影简介GE Medical SystemsTraining in Partnership射频相关伪影射频相关伪影RF 溢出采集的信号过强，在模数转化时无法精确地数字化MRCP时出现这种伪影，可以在image option中加上EDR其他部位扫描出现这种情况，点击manual prescan,在其中手动调节TG7磁共振伪影简介GE Medical SystemsTraining in Partnership梯度相关伪影梯度相关伪影矢冠状图像变形梯度场切换率过高未使用梯度线性校正 缩小扫描视野打开梯度线性校正8磁共振伪影简介GE Medical SystemsTraining in Partnership梯度相关伪影梯度相关伪影Eddy current 伪影9磁共振伪影简介GE Medical SystemsTraining in PartnershipDWIXYZ梯度相关伪影梯度相关伪影10磁共振伪影简介GE Medical SystemsTraining in Partnership梯度相关伪影梯度相关伪影梯度线圈损坏11磁共振伪影简介GE Medical SystemsTraining in Partnership梯度相关伪影梯度相关伪影12磁共振伪影简介GE Medical SystemsTraining in Partnership图像处理相关伪影图像处理相关伪影Spike 伪影K空间中出现错误数据 重新扫描，如果伪影持续存在，请联系工程师13磁共振伪影简介GE Medical SystemsTraining in Partnership图像处理相关伪影图像处理相关伪影化学伪影伪影出现在脂肪与水的交界面处出现在频率方向一侧表现为高信号线，另一侧为低信号线解决方法是增大采样带宽14磁共振伪影简介GE Medical SystemsTraining in Partnership图像处理相关伪影图像处理相关伪影化学位移伪影15磁共振伪影简介GE Medical SystemsTraining in Partnership图像处理相关伪影图像处理相关伪影Gibbs伪影相位或频率方向数据采集不足表现为与边界平行的黑色或白色的线解决方法是增大扫描矩阵，降低扫描FOV128*128256*25616磁共振伪影简介GE Medical SystemsTraining in Partnership图像处理相关伪影图像处理相关伪影Gibbs伪影17磁共振伪影简介GE Medical SystemsTraining in Partnership图像处理相关伪影图像处理相关伪影Annefect 伪影扫描视野过小时，翻转相位方向扫描视野与线圈范围严重不匹配增大扫描视野或调整线圈与扫描视野相匹配18磁共振伪影简介GE Medical SystemsTraining in Partnership图像处理相关伪影图像处理相关伪影Aliasing 伪影19磁共振伪影简介GE Medical SystemsTraining in Partnership图像处理相关伪影图像处理相关伪影Aliasing 伪影20磁共振伪影简介GE Medical SystemsTraining in Partnership磁敏感性伪影磁敏感性伪影局部磁场不均匀引起的EPI图像变形21磁共振伪影简介GE Medical SystemsTraining in Partnership磁敏感性伪影磁敏感性伪影局部磁场不均匀引起的常规图像变形22磁共振伪影简介GE Medical SystemsTraining in Partnership磁敏感性伪影磁敏感性伪影23磁共振伪影简介GE Medical SystemsTraining in Partnership磁敏感性伪影磁敏感性伪影局部磁场不均匀引起脂肪抑制异常24磁共振伪影简介GE Medical SystemsTraining in PartnershipGE Medical SystemsTraining in Partnership磁敏感性伪影磁敏感性伪影磁敏感伪影扫描时患者上肢没有上举26磁共振伪影简介GE Medical SystemsTraining in Partnership磁敏感性伪影磁敏感性伪影扫描视野过大降低TE，降低ETL27磁共振伪影简介GE Medical SystemsTraining in Partnership患者相关伪影患者相关伪影Magic angle 效应肌腱与主磁场成55度夹角时会表现为异常高信号主要出现在T1和PD图像上，T2 会明显衰减28磁共振伪影简介GE Medical SystemsTraining in Partnership1333参数相关伪影参数相关伪影修改ETL29磁共振伪影简介GE Medical SystemsTraining in Partnership1333参数相关伪影参数相关伪影修改ETL154130磁共振伪影简介GE Medical SystemsTraining in Partnership参数相关伪影参数相关伪影修改带宽154131磁共振伪影简介GE Medical SystemsTraining in Partnership参数相关伪影参数相关伪影定位线交叉32磁共振伪影简介GE Medical SystemsTraining in Partnership参数相关伪影参数相关伪影定位线交叉33磁共振伪影简介GE Medical SystemsTraining in Partnership参数相关伪影参数相关伪影Phase correction打开或关闭34磁共振伪影简介GE Medical SystemsTraining in Partnership参数相关伪影参数相关伪影PURE伪影线线圈圈摆摆放放错错误误线线圈圈单单元元损损坏坏35磁共振伪影简介GE Medical SystemsTraining in Partnership参数相关伪影参数相关伪影修改NEX36磁共振伪影简介GE Medical SystemsTraining in Partnership参数相关伪影参数相关伪影频率方向错误37磁共振伪影简介GE Medical SystemsTraining in Partnership总结总结出现伪影，首先明确伪影的性质出现伪影，首先明确伪影的性质排除操作原因排除操作原因寻求工程师帮助寻求工程师帮助38磁共振伪影简介GE Medical SystemsTraining in Partnership谢谢谢谢39磁共振伪影简介