Innovative Design and Optimization of Adjustable Capacitors for Radio-Frequency new MRI Systems

Abstract

Zaineb JEBRI and Mahfoudh TALEB ALI

This review delineates significant strides in the evolution of adjustable capacitors tailored specifically for high- frequency Magnetic Resonance Imaging (MRI) applications. The research spans critical phases, meticulously detailing the adaptation of electrode shapes to attain versatile capacitance within a high-frequency spectrum. The prototype, a key focal point, showcases distinctive attributes, featuring silver-fixed and CuNiZn half-disc mobile plates mounted on a MgTiCa ceramic pellet. Comprehensive evaluation, incorporating simulation and measurement at 10MHz, illuminates the prototype's capacitance dynamics.

The optimization model scrutinizes pivotal parameters governing capacitor assembly, placing a specific emphasis on the profound influence of air gap thickness on rotor equilibrium. A granular analysis of the air gap's impact on capacitance and self-resonance frequency enriches the study, offering valuable insights into configurations optimized for high- frequency MRI applications. Validation of the prototype's electrical properties through the HP Agilent 4192A LF Impedance Analyzer establishes a robust correlation with simulation results, effectively aligning with stringent MRI system specifications. The intricate assembly process, inclusive of electrode optimization considering frequency nuances and the innovative use of silver glue, is meticulously expounded upon.

In-depth discussion encapsulates the rigorous validation of the development process, the stability exhibited by chosen materials across varying frequencies, and the nuanced influence of the air gap on capacitance. After concluding that the prototype meets specifications, the study charts a course for future research toward competitive trimmers for high- frequency MRIs.

What distinguishes this research is its meticulous exploration of electrode shapes, the unique composition of the prototype, and a comprehensive analysis of the intricate interplay between air gap variations and capacitor performance. This work is distinguished further by the inclusion of silver glue that enhances practical implementation.

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