A Preliminary Study for Reference RF Coil at 11.7 T MRI: Based on Electromagnetic Field Simulation of Hybrid-BC RF Coil According to Diameter and Length at 3.0, 7.0 and 11.7 T
- Authors
- Seo, Jeung-Hoon; Chung, Jun-Young
- Issue Date
- Feb-2022
- Publisher
- MDPI
- Keywords
- 11.7 T MRI; Electromagnetic field simulation; FDTD method; Finite difference time-domain method; Hybrid-type birdcage coil; Magnetic resonance imaging; Reference radiofrequency coil
- Citation
- Sensors, v.22, no.4
- Journal Title
- Sensors
- Volume
- 22
- Number
- 4
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/83860
- DOI
- 10.3390/s22041512
- ISSN
- 1424-8220
- Abstract
- Magnetic resonance imaging (MRI) systems must undergo quantitative evaluation through daily and periodic performance assessments. In general, the reference or standard radiof-requency (RF) coils for these performance assessments of 1.5 to 7.0 T MRI systems have been low-pass-type birdcage (LP-BC) RF coils. However, LP-BC RF coils are inappropriate for use as reference RF coils because of their relatively lower magnetic field (B1-field) sensitivity than other types of BC RF coils, especially in ultrahigh-field (UHF) MRI systems above 3.0 T. Herein, we propose a hybrid-type BC (Hybrid-BC) RF coil as a reference RF coil with improved B1-field sensitivity in UHF MRI system and applied it to an 11.7 T MRI system. An electromagnetic field (EM-field) analysis on the Hybrid-BC RF coil was performed to provide the proper dimensions for its use as a reference RF coil. Commercial finite difference time-domain program was used in EM-field simulation, and home-made analysis programs were used in analysis. The optimal specifications of the proposed Hybrid-BC RF coils for them to qualify as reference RF coils are proposed based on their B1+-field sensitivity under unnormalized conditions, as well as by considering their B1+-field uniformity and RF safety under normalized conditions. © 2022 by the authors. Licensee MDPI, Basel, Switzerland.
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