Oellinger H, Wendt O, Siewert C, Park I C, Dorsch M, Lüth T C, Felix R, Boenick U
Universitätsklinikum Charité Berlin.
Biomed Tech (Berl). 1998 Oct;43(10):281-6. doi: 10.1515/bmte.1998.43.10.281.
This article shows the results of an experimental investigation of the interference by paramagnetic and diamagnetic materials on imaging in a closed 1.5 Tesla high field magnetic resonance imaging system (MRI). For different types of sequences (SE, GE, EPI) the effects of metal and non-metal profiles in producing artefacts were investigated. A phantom (plastic trunk) filled with Gd-Mn-solution was used for representation of the artefacts. The materials analysed were placed parallel to the phantom at predetermined distances. The images were obtained in transverse and sagittal planes and analysed with respect to the resulting artefacts. The results show that aluminum and polymer profiles produce the weakest artefacts, even when the material is positioned close to the phantom. A comparison of the sequence types shows that the SE-sequence has a low sensitivity to artefacts, despite the great profile variation in size and shape. The SE-sequence accordingly showed a higher imaging stability as compared with the GE- and EPI-sequences. Steel and copper produced the strongest artefacts. The examination was begun after an intensive study of the literature (Internet, Medline, Meditec). So far have been few publications on this subject.
本文展示了一项实验研究的结果，该研究探讨了顺磁性和抗磁性材料对封闭的1.5特斯拉高场磁共振成像系统（MRI）成像的干扰。针对不同类型的序列（自旋回波序列（SE）、梯度回波序列（GE）、回波平面成像序列（EPI）），研究了金属和非金属轮廓在产生伪影方面的影响。使用一个填充钆 - 锰溶液的体模（塑料躯干）来模拟伪影。将分析的材料以预定距离平行于体模放置。在横断面和矢状面获取图像，并针对产生的伪影进行分析。结果表明，即使材料靠近体模放置，铝和聚合物轮廓产生的伪影最弱。序列类型的比较表明，尽管轮廓在尺寸和形状上变化很大，但SE序列对伪影的敏感性较低。因此，与GE序列和EPI序列相比，SE序列显示出更高的成像稳定性。钢和铜产生的伪影最强。这项研究是在对文献（互联网、医学文献数据库、医学技术文献）进行深入研究之后开始的。到目前为止，关于这个主题的出版物很少。
