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Abstract #4396

Dual-Tuned Floating Solenoid Balun for Multi-nuclear MRI and MRS

Yijin Yang1, Ming Lu2,3, and Xinqiang Yan1,2,3
1Electrical and Computer Engineering, Vanderbilt University, Nashville, TN, United States, 2Vanderbilt University Institute of Imaging Science, Vanderbilt University Medical Center, Nashville, TN, United States, 3Department of Radiology and Radiological Sciences, Vanderbilt University Medical Center, Nashville, TN, United States

Synopsis

Keywords: New Devices, Safety, Balun

Motivation: Conventional baluns for multi-nuclei MRI and MRS applications require extensive space and numerous components, resulting in complex soldering processes.

Goal(s): Developing dual-tuned and float balun with minimum size and great common-mode current reduction ratio (CMRR).

Approach: A double-layer solenoidal design was implemented to maximize mutual inductance, with a floating configuration that reduces overall dimensions, while incorporating a pole-insertion circuit to achieve the second resonance frequency.

Results: The CMRR reached -21.1 dB at 78.6 MHz and -26.8 dB at 298 MHz which indicates 99% common-mode current is suppressed with the balun dimension 16mm in diameter and 24mm in length for RG-174 alike cable design.

Impact: This balun design effectively reduces the space requirements and component count for multi-nuclei MRI and MRS. It achieves excellent CMRR across various cable types and can be tuned to different resonant frequencies, thereby enhancing patient safety and maintaining signal integrity.

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