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Advanced RF Hardware Solutions for I...

Bhosale, Aditya Ashok,

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Advanced RF Hardware Solutions for Improved Imaging Performance and Safety in Ultra-High and Very-Low-Field MRI /

Record Type:	Electronic resources : Monograph/item
Title/Author:	Advanced RF Hardware Solutions for Improved Imaging Performance and Safety in Ultra-High and Very-Low-Field MRI // Aditya Ashok Bhosale.
Author:	Bhosale, Aditya Ashok,
Description:	1 electronic resource (236 pages)
Notes:	Source: Dissertations Abstracts International, Volume: 86-12, Section: B.
Contained By:	Dissertations Abstracts International86-12B.
Subject:	Medical imaging. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=32038404
ISBN:	9798280781702

Advanced RF Hardware Solutions for Improved Imaging Performance and Safety in Ultra-High and Very-Low-Field MRI /
Bhosale, Aditya Ashok,

Advanced RF Hardware Solutions for Improved Imaging Performance and Safety in Ultra-High and Very-Low-Field MRI /Aditya Ashok Bhosale. - 1 electronic resource (236 pages)

Source: Dissertations Abstracts International, Volume: 86-12, Section: B.

Magnetic resonance imaging (MRI) continues to evolve across a wide range of field strengths, from ultra-high-field (7T) to very-low-field (70 mT) systems. Despite their clinical potential, each regime presents unique challenges in RF coil design, affecting imaging quality, patient safety, and system accessibility. This dissertation introduces a series of innovations in antenna structures, multi-channel array configurations, safety enhancement techniques, and material-based performance improvements to address these challenges and expand MRI's diagnostic capabilities.At ultra-high fields, discretely dielectric-coated dipole (DDMC) antennas were developed to improve tuning stability, B1⁺ efficiency, and SAR control, offering a significant advancement over conventional designs. Complementary solenoidal dipole geometries further enhanced field uniformity for compact anatomical imaging. Extending these concepts to multi-channel arrays, systems such as a 15-channel DDMC dipole array and a 13-channel hybrid microstrip-birdcage array demonstrated improved B1⁺ coverage and SAR management across complex anatomical regions. Systematic evaluations of dipole types and array configurations provided new insights into optimizing SNR, field distribution, and inter-element coupling.At very-low-field, simulations revealed that superconducting materials substantially enhance coil SNR compared to room-temperature and low-temperature copper, particularly in surface coil designs. The integration of high-dielectric constant materials successfully mitigated electric fields and SAR in high-impedance coils, offering a pathway toward safer imaging. Finally, advanced catheter markers were designed for low-field interventional MRI, enabling robust, orientation-independent device visualization without disturbing background fields. Together, these advancements form a foundation for safer, higher-performance, and more accessible MRI systems, paving the way for future innovations in flexible coil arrays, dynamic SAR control, superconducting technologies, and portable MRI platforms.

English

ISBN: 9798280781702Subjects--Topical Terms:

3172799
Medical imaging.
Subjects--Index Terms:

Electromagnetic simulations

Advanced RF Hardware Solutions for Improved Imaging Performance and Safety in Ultra-High and Very-Low-Field MRI /
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520 $a Magnetic resonance imaging (MRI) continues to evolve across a wide range of field strengths, from ultra-high-field (7T) to very-low-field (70 mT) systems. Despite their clinical potential, each regime presents unique challenges in RF coil design, affecting imaging quality, patient safety, and system accessibility. This dissertation introduces a series of innovations in antenna structures, multi-channel array configurations, safety enhancement techniques, and material-based performance improvements to address these challenges and expand MRI's diagnostic capabilities.At ultra-high fields, discretely dielectric-coated dipole (DDMC) antennas were developed to improve tuning stability, B1⁺ efficiency, and SAR control, offering a significant advancement over conventional designs. Complementary solenoidal dipole geometries further enhanced field uniformity for compact anatomical imaging. Extending these concepts to multi-channel arrays, systems such as a 15-channel DDMC dipole array and a 13-channel hybrid microstrip-birdcage array demonstrated improved B1⁺ coverage and SAR management across complex anatomical regions. Systematic evaluations of dipole types and array configurations provided new insights into optimizing SNR, field distribution, and inter-element coupling.At very-low-field, simulations revealed that superconducting materials substantially enhance coil SNR compared to room-temperature and low-temperature copper, particularly in surface coil designs. The integration of high-dielectric constant materials successfully mitigated electric fields and SAR in high-impedance coils, offering a pathway toward safer imaging. Finally, advanced catheter markers were designed for low-field interventional MRI, enabling robust, orientation-independent device visualization without disturbing background fields. Together, these advancements form a foundation for safer, higher-performance, and more accessible MRI systems, paving the way for future innovations in flexible coil arrays, dynamic SAR control, superconducting technologies, and portable MRI platforms.
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