Conveners
Fri-Mo-Po.03 - Magnets for MRI
- Chaemin Im
- Vijay Soni (GE HealthCare Technology & Innovation Center)
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Rafael de Souza (Fluminense Federal University)04/07/2025, 09:30D02: Magnets for MRIPoster
Magnetic Resonance Imaging (MRI) is a technique that generates high-resolution volumetric images of the body using a strong magnetic flux density. The image quality directly depends on the magnetic field homogeneity. Commercial superconducting magnets have a magnetic field homogeneity below two parts per million (ppm) and use Nb-Ti magnets. However, they need to be cooled at 4 K. It is costly...
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Zhenghang Wang04/07/2025, 09:30Poster
3.0T Head-Only Superconducting magnetic resonance imaging (MRI) is under developed at the Wuhan National High Magnetic Field Center (WHMFC). Gradient coils, which generate linear gradient magnetic fields orthogonal to each other along the X, Y, and Z directions, are critical components of MRI systems. However, existing asymmetric gradient coil designs often encounter challenges, including...
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Dr Yaohui Wang (Division of Superconducting Magnet Science and Technology, Institute of Electrical Engineering, Chinese Academy of Sciences; School of Electronic, Electrical and Communication Engineering, University of Chinese Academy of Sciences)04/07/2025, 09:30Poster
The conventional iron matrix shimming method is sensitive to positional variations, which significantly impacts the magnetic field homogeneity of small-aperture 7T/54mm cryogen-free MRI superconducting magnets. This study aims to develop a robust, adjustable shimming method to improve magnetic field uniformity and precisely cancel low-order harmonics in these sensitive systems. A set of...
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Yaohui Wang04/07/2025, 09:30Poster
The pursuit of ultrahigh magnetic fields is a key research direction in MRI, offering high signal-to-noise ratio (SNR), high resolution, and advanced imaging methodologies. However, ultrahigh-field MRI systems, such as 7T human MRI, are extremely costly, often around 10 million US dollars, making them unaffordable for many researchers. Therefore, there is a high demand for developing...
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Mr João Henrique Ramos Silva (Brazilian Center for Research in Energy and Materials)04/07/2025, 09:30Poster
The Brazilian Center for Research in Energy and Materials (CNPEM) has built a medium field Magnetic Resonance Image (MRI) prototype as part of an overall effort on the in-house development of fundamental MRI technology know-how. The system is comprised of a permanent-magnet-based dipole, a set of planar coils for gradient field generation and a radiofrequency system with a...
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Dr Dongkeun Park (Massachusetts Institute of Technology), Jintao Hu04/07/2025, 09:30Poster
In this paper, we present the design and test results of a low-AC-loss Nb3Sn model coil developed to validate key enabling technologies for a fast-switching-field magnetic resonance imaging (MRI) magnet concept that can change the magnetic field very quickly in time, within 1 second, between significantly different field strengths: a high field (3 T) for relaxometry and prepolarization and a...
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Chao Zhou (Institute of Plasma Physics, Chinese Academy of Sciences)04/07/2025, 09:30Poster
Abstract：High field magnetic resonance imaging (HF-MRI) systems can achieve higher image resolution and sensitivity, resulting in better image quality and more biological information, which has significant value in life science and clinical medicine applications. The key to high field magnetic resonance imaging systems is the high homogeneous superconducting magnets, and active homogenization...
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Dr Anbo Wu (GE HealthCare Technology and Innovation Center)04/07/2025, 09:30Invited Poster
A low-cryogen compact 7T MRI system(C7T) dedicated for brain imaging has been developed at the GE HealthCare Technology and Innovation Center. The C7T magnet utilizes a fully sealed helium cooling system. Only 12 liters of liquid helium are condensed at 4.2 K from high pressure gaseous helium charged at room temperature. The C7T magnet is designed for a B0-field homogeneity <1.0 ppm in a 26-cm...
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