Keywords: High-Field MRI, RF Arrays & Systems, Ultra-high-field MRI, Dipole antenna, Frequency tuning, B1+ distribution, Electric field reduction
Motivation: Dipole antennas struggle with imaging small regions at 300 MHz due to their reliance on physical length for tuning, which limits resolution.
Goal(s): This study aims to develop a discretely dielectric-material-coated (DDMC) dipole antenna for dipole-length-independent frequency tuning, improving imaging quality and safety.
Approach: We designed and constructed discretely dielectric-material-coated dipole antenna and compared the DDMC design with fractionated dipole designs using simulations and bench-testing, employing a high-dielectric-material to achieve 300 MHz resonance without altering physical dimensions.
Results: The DDMC dipole provided a more uniform B1+ distribution and lower electric fields, demonstrating superior decoupling and a higher Q-factor for enhanced ultra-high-field MRI performance.
Impact: This research advances ultra-high-field MRI technology by enhancing imaging quality and safety through innovative dipole antenna designs. Future studies can explore optimized dielectric materials, improving access to high-resolution imaging in clinical settings and benefiting patients with complex anatomical needs.
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