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Design considerations and experimental results for MRI systems using HTS magnets

机译:使用HTS磁体的MRI系统的设计考虑和实验结果

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An increasing number of magnetic resonance imaging (MRI) systems using high temperature superconductors (HTS) magnets have been designed and constructed, with detailed results of their performance now available. Features of REBCO and BSCCO conductors are described as they pertain to use in high homogeneity magnets, with emphasis placed on the practical use of these conductors in magnets. Methods of coil winding are discussed, in particular the differences between pancake and layer winding techniques. Design considerations for HTS magnets are presented in light of the difficulties presented by quench in these magnets, but also in terms of the features of HTS magnets afforded by their high operating temperatures, namely robust cryogen free operation and the potential to use unshielded gradient coils. Drawing on two example MRI systems, namely a 3 T BSCCO brain imaging magnet developed in Japan and a 1.5 T REBCO orthopaedic imaging system developed in New Zealand, the report details real-world stability and homogeneity of HTS-MRI systems, in particular with regards to the screening current effects observed in these systems. It is concluded that, apart from conductor cost, there are currently no technical obstacles to use of HTS-MRI systems.
机译:设计并构造了使用高温超导体(HTS)磁铁的磁共振成像(MRI)系统的越来越多的磁共振成像(MRI)系统,其性能的详细结果现在可用。 REBCO和BSCCO导体的特点被描述为在高同质性磁体中使用,重点放置在磁铁中这些导体的实际应用。讨论了线圈绕组的方法,特别是煎饼和层绕组技术之间的差异。鉴于这些磁体中的淬火呈现的困难,还借鉴了HTS磁体的设计考虑,而且还提出了由其高工作温度提供的HTS磁体的特征,即鲁棒的低温操作以及使用非屏蔽梯度线圈的可能性。在两个示例MRI系统上绘制,即在日本开发的3T BSCCO脑成像磁铁和新西兰开发的1.5 T REBCO骨科成像系统,报告详细介绍了HTS-MRI系统的现实世界稳定性和同质性,特别是关于在这些系统中观察到的筛选电流效果。结论是,除了导体成本之外,目前没有使用HTS-MRI系统的技术障碍。

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