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Abstract #4266

Discretely Dielectric-Material Coated Dipole Antenna: Enhanced Tuning and Electric Field Reduction for Safety at 300 MHz

Aditya Ashok Bhosale1, Yunkun Zhao1, Komlan Payne1, Leslie L Ying1,2, and Xiaoliang Zhang1,2
1Department of Biomedical Engineering, The State University of New York at Buffalo, Buffalo, NY, United States, 2Department of Electrical Engineering, The State University of New York at Buffalo, Buffalo, NY, United States

Synopsis

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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