Design, construction and performance testing of a 1.5 T cryogen-free low-temperature superconductor whole-body MRI magnet
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Published:2023-02-13
Issue:4
Volume:36
Page:045002
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ISSN:0953-2048
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Container-title:Superconductor Science and Technology
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language:
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Short-container-title:Supercond. Sci. Technol.
Author:
Wang YulinORCID,
Wang Sucong,
Liang Ping,
Brusic Vladimir,
Zeng Jie,
Liu Bingjian,
Ge Yuwei,
Zheng Jianjun,
Zhang Jingfeng,
Wang ChengboORCID
Abstract
Abstract
This work describes the design, construction and testing of a 1.5 T cryogen-free low-temperature superconductor niobium–titanium whole-body magnet with a bore diameter of 850 mm that is suitable for clinical magnetic resonance imaging (MRI) applications. The magnet is actively shielded and passively shimmed to achieve confinement within a 0.5 mT stray magnetic field at 2.5/4 m radial/axial positions and 12.1 ppm field inhomogeneity over a 45 mm diameter of spherical volume. The magnet is conductively refrigerated using a two-stage Gifford–McMahon cryocooler and can be maintained at a steady temperature below 5.7 K during MRI scanning. The MRI scanner assembled with the designed cryogen-free magnet demonstrated stable performance and provided MRI images with good quality and high contrast.
Funder
National Key R&D Program of China
Ningbo Clinical Research Centre for Medical Imaging
Ningbo ‘S&T Innovation 2025’ Major program
Subject
Materials Chemistry,Electrical and Electronic Engineering,Metals and Alloys,Condensed Matter Physics,Ceramics and Composites
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