Current Recycled and Self-Phase Shift to Expand the Length of Radio-Frequency Coils, With Application to Brain and Spine Coil Array at 7T MRIopen access
- Authors
- Hernandez, Daniel; Kim, Donghyuk; Nam, Taewoo; Jeong, Yonghwa; Seo, Minyeong; Lee, Eunwoo; Kim, Junghwan; Kim, Kyoung-Nam
- Issue Date
- Oct-2023
- Publisher
- IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
- Keywords
- Coils; Magnetic resonance imaging; Geometry; Specific absorption rate; Computational modeling; Magnetic fields; Brain modeling; MRI; antennas; spine imaging; EM simulations
- Citation
- IEEE ACCESS, v.11, pp 120438 - 120448
- Pages
- 11
- Journal Title
- IEEE ACCESS
- Volume
- 11
- Start Page
- 120438
- End Page
- 120448
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/89667
- DOI
- 10.1109/ACCESS.2023.3326822
- ISSN
- 2169-3536
- Abstract
- 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.
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