Gradient coil design with enhanced shielding constraint for a cryogen-free superconducting MRI system  

作　　者：Yaohui Wang Weimin Wang Hui Liu Shunzhong Chen Feng Liu Qiuliang Wang 

机构地区：[1]Institute of Electrical Engineering,Chinese Academy of Sciences,Beijing,100190,China [2]School of Electronic,Electrical and Communication Engineering,University of Chinese Academy of Sciences,Beijing,100049,China [3]School of Electronics&Institute of Biomedical Engineering,Peking University&Shenzhen Graduate School,Shenzhen,518055,China [4]School of Information Technology and Electrical Engineering,The University of Queensland,St Lucia,Brisbane,QLD,4072,Australia

出　　处：《Magnetic Resonance Letters》2024年第1期1-9,共9页磁共振快报（英文）

基　　金：This work is funded by the Magnetic Resonance Union of the Chinese Academy of Sciences(Grant No.2021gzl002);the International Partnership Program of Chinese Academy of Sciences(Grant No.182111KYSB20210014);the National Science Foundation of China(Grant No.52293423,Grant No.52277031);the Research and Development of Key Technologies and Equipment for Major Science and Technology Infrastructure of Development and Reform Commission of Shenzhen Municipality,China(Grant No.ZDKJ20190305002).

摘　　要：The relatively fragile low-temperature stability of cryogen-free superconducting magnetic resonance imaging(MRI)magnets requires the careful management of exogenous heat sources.A strongly shielded gradient magnetic field is important for the optimal operation of cryogen-free MRI systems.In this study,we present an enhanced shielding method incorporating a regionalized stray field constraining strategy.By optimizing the constraint parameters,we could develop engineering-feasible gradient coil schemes without increasing system complexity but with the stray field intensity reduced by half.In real measurement in an integrated MRI system,the developed gradient assembly demonstrated good performance and supported to output images of excellent quality.Our findings suggested that the proposed method could potentially form a useful design paradigm for cryogen-free MRI magnets.

关 键 词：MRI Gradient coil Superconducting magnet Cryogen-free Magnetic shielding 

分 类 号：R445.2[医药卫生—影像医学与核医学] O482.532[医药卫生—诊断学]