ΔB₀ Field Control in High Field MRI with Local Multcoil Shim Arrays
Name
arango-narango-phd-eecs-2025-thesis.pdf
Description
Thesis PDF
Size
32.92 MB
Format
Adobe PDF
Checksum (MD5)
4b227157bcff977fb9954839a65a111e
Author(s)
Arango, Nicolas
Advisor(s)
White, Jacob
Date Issued
February 2025
Publisher
Massachusetts Institute of Technology
Abstract
Local multicoil ΔB₀ shim arrays enable low-cost, simple to fabricate, and physically small, static magnetic field control in magnetic resonance imaging. The presented thesis will show frameworks for coil current calculation for homogeneity and novel selective excitation applications. As MRI RF coils trend towards repositionable and flexible systems for their ease of use and tight-to-the-patient fit, ΔB₀ shim arrays are left behind for lack of rapid, patient-on-the-table calibration. We show an inverse problem approach with physics-based regularization and adaptation to accelerate calibration by over 50 fold. The numerical tools developed for calibration also proved useful for design to enable novel upper bounds on ΔB₀ shim performance and new tools for automatic application and anatomy-specific local multicoil array design.
MIT Department
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
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