用于低场磁共振成像的多模态表面线圈

IF 2.1 4区 医学 Q2 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING Magnetic resonance imaging Pub Date : 2024-07-04 DOI:10.1016/j.mri.2024.07.005
Yunkun Zhao , Aditya A. Bhosale , Xiaoliang Zhang
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引用次数: 0

摘要

低磁场磁共振成像比高磁场磁共振成像更安全、更经济。低磁场磁共振成像的固有问题之一是信噪比或灵敏度较低。在这项工作中,我们引入了一种用于信号激发和接收的多模态表面线圈技术,以提高射频磁场(B1)效率,并有可能提高磁共振灵敏度。拟议的多模态表面线圈由多个相同的谐振器组成,这些谐振器通过电磁耦合形成一个多模态谐振器。其最低频率模式的场分布适合磁共振成像应用。我们制作了多模态表面线圈原型,并通过数值模拟、标准射频测量和测试以及与传统表面线圈在低磁场下的比较,对其性能进行了研究和验证。我们的结果表明,多模态表面线圈的 B1 效率优于传统表面线圈,而传统表面线圈的 B1 效率在所有线圈类别(即体积线圈、半体积线圈和表面线圈)中是最高的。此外,在低场磁共振成像中,所需的低频线圈通常使用大电容值来实现低谐振频率,这就给频率调谐带来了困难。所提出的多模态表面线圈可以方便地调谐到低场磁共振成像所需的低频,而且电容值大大降低,与传统的表面线圈相比,具有出色的低频工作能力。
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Multimodal surface coils for low field MR imaging

Low field MRI is safer and more cost effective than the high field MRI. One of the inherent problems of low field MRI is its low signal-to-noise ratio or sensitivity. In this work, we introduce a multimodal surface coil technique for signal excitation and reception to improve the RF magnetic field (B1) efficiency and potentially improve MR sensitivity. The proposed multimodal surface coil consists of multiple identical resonators that are electromagnetically coupled to form a multimodal resonator. The field distribution of its lowest frequency mode is suitable for MR imaging applications. The prototype multimodal surface coils are built, and the performance is investigated and validated through numerical simulation, standard RF measurements and tests, and comparison with the conventional surface coil at low fields. Our results show that the B1 efficiency of the multimodal surface coil outperforms that of the conventional surface coil which is known to offer the highest B1 efficiency among all coil categories, i.e., volume coil, half-volume coil and surface coil. In addition, in low-field MRI, the required low-frequency coils often use large value capacitance to achieve the low resonant frequency which makes frequency tuning difficult. The proposed multimodal surface coil can be conveniently tuned to the required low frequency for low-field MRI with significantly reduced capacitance value, demonstrating excellent low-frequency operation capability over the conventional surface coil.

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来源期刊
Magnetic resonance imaging
Magnetic resonance imaging 医学-核医学
CiteScore
4.70
自引率
4.00%
发文量
194
审稿时长
83 days
期刊介绍: Magnetic Resonance Imaging (MRI) is the first international multidisciplinary journal encompassing physical, life, and clinical science investigations as they relate to the development and use of magnetic resonance imaging. MRI is dedicated to both basic research, technological innovation and applications, providing a single forum for communication among radiologists, physicists, chemists, biochemists, biologists, engineers, internists, pathologists, physiologists, computer scientists, and mathematicians.
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