高场磁共振成像常见伪影与消除分析

目的研究高磁共振成像（MRI）伪影产生的机理，表现特点和处理方式。方法回顾性分析对188例采用GE-HDe1．5T超导磁共振扫描的伪影图像进行分类并分析原因。结果将伪影归纳为四大类：运动伪影；与磁场和梯度场有关的伪影；化学位移伪影；卷褶伪影和部分容积效应伪影。一般的伪影可根据诊断的需要采用不同的方法加以克服。与磁场和梯度场有关的伪影在去除外界因素干扰仍无法改善时，则请专业的技术人员进行判断和维护。结论分析1．5T磁共振伪影产生的机理，对改善图像质量，提高诊断率具有重要意义。

Performance and Measures of Common Artifacts in High-field MRI

Objective To study the mechanism, perfomance and measurement of artifacts in high-field MRI. Methods To analyze 188 MRI images which have the different artifacts underwent GE-HDe 1.5T MRI. Results There were four different artifacts：motion artifact; magnetisability artifacts;chemical -shift artifact;fold volume and partial volume effect artifacts. We can improve the figure quality according to the different diagnosis objects except the professiohal question which need the help from professional engineer, Conclusion Knowing the mechanism of causing artifacts in 1.5T MR, the effective methods can be gotten and the imaging quality may be better in high field MRI.