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

Magnetic Resonance Letters Pub Date : 2024-02-01 DOI:10.1016/j.mrl.2023.09.001

Yaohui Wang , Weimin Wang , Hui Liu , Shunzhong Chen , Feng Liu , Qiuliang Wang

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Abstract

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.

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为无低温超导磁共振成像系统设计具有增强屏蔽约束的梯度线圈

无低温超导磁共振成像（MRI）磁体的低温稳定性相对脆弱，需要对外源热源进行谨慎管理。强屏蔽梯度磁场对于无低温磁共振成像系统的最佳运行非常重要。在这项研究中，我们提出了一种包含区域化杂散磁场约束策略的增强型屏蔽方法。通过优化约束参数，我们可以在不增加系统复杂性的情况下开发出工程可行的梯度线圈方案，同时将杂散磁场强度降低一半。在集成磁共振成像系统的实际测量中，所开发的梯度组件表现出良好的性能，并支持输出质量上乘的图像。我们的研究结果表明，所提出的方法有可能成为无低温磁共振成像磁体的有用设计范例。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Magnetic Resonance Letters Analytical Chemistry, Spectroscopy, Radiology and Imaging, Biochemistry, Genetics and Molecular Biology (General)

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