Current Recycled and Self-Phase Shift to Expand the Length of Radio-Frequency Coils, With Application to Brain and Spine Coil Array at 7T MRI

被引:1
作者
Hernandez, Daniel [1 ]
Kim, Donghyuk [1 ]
Nam, Taewoo [2 ]
Jeong, Yonghwa [1 ]
Seo, Minyeong [1 ]
Lee, Eunwoo [3 ]
Kim, Junghwan [4 ,5 ]
Kim, Kyoung-Nam [3 ]
机构
[1] Gachon Univ, Neurosci Res Inst, Incheon 21565, South Korea
[2] Gachon Univ, Dept Hlth Sci & Technol, GAIHST, Incheon 21999, South Korea
[3] Gachon Univ, Dept Biomed Engn, Seongnam 13120, South Korea
[4] Univ Missouri Columbia, Dept Radiol, Columbia, MO 65211 USA
[5] Univ Missouri Columbia, EECS, Columbia, MO 65211 USA
基金
新加坡国家研究基金会;
关键词
Coils; Magnetic resonance imaging; Geometry; Specific absorption rate; Computational modeling; Magnetic fields; Brain modeling; MRI; antennas; spine imaging; EM simulations; POWER; SAR;
D O I
10.1109/ACCESS.2023.3326822
中图分类号
TP [自动化技术、计算机技术];
学科分类号
0812 ;
摘要
The use of the 7-Tesla (T) magnetic resonance imaging (MRI) promises improved imaging quality and higher resolution compared with lower-field MRI systems. The design of the loop coil considers the tradeoff between coil size and performance. A larger coil enables deeper field penetration, but it may result in poorer field uniformity and localization. On the other hand, a smaller coil offers improved localization capabilities, however, field penetration reduces, and multiple coil elements are required to cover the same space as large coils. Additionally, safety concerns regarding the high-energy absorption of electromagnetic waves in healthy tissues principally limit the use of the 7T MRI, which is measured with the specific absorption rate (SAR). A coil that can generate a uniform magnetic field while maintaining a low SAR is necessary to comply with the SAR limits. We propose a coil design that recirculates the current and provides a phase shift in the same structure to provide a magnetic field over a broad area, thus reducing the number of channels required to cover the same area. We present electromagnetic (EM) simulations of the proposed coil with a magnetic field and SAR computed for the brain and human spine model. We built the coil and acquired images with a phantom using a 7T MRI system. The proposed coil improves the SAR by 43% compared with the reference coil in the spinal area in the case of EM simulations, indicating the imaging quality improvement potential of our proposed coil.
引用
收藏
页码:120438 / 120448
页数:11
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