Keywords: High-Field MRI, System Imperfections: Measurement & Correction, dielectric pads
Motivation: At ultra-high fields, B1+ inhomogeneities induce unwanted signal loss or hyper-intensity. Current shimming approaches lack an easy-to-apply solution like dielectric pads, that would also allow subject-specific tailoring.
Goal(s): To evaluate a novel remote shimming device based on actively-coupled dielectric pads.
Approach: A switchboard was constructed using MR-compatible PIN-diodes. Previously proposed dielectric pocket manual coupling configuration was compared to the equivalent remotely enabled connection, in a 3x3 dielectric pad array.
Results: Remote shimming device achieved up to 8% modulation across the ROI, compared to X% in the equivalent manual coupling. Shimming location was movable with the choice of coupled dielectric pockets within the array.
Impact: At ultra-high field imaging, B1+ inhomogeneities become increasingly prominent. Current shimming approaches lack wide-availability with an option for subject-specific tailoring. In this work, we evaluate a novel remote shimming device based on a dielectric pad array with PIN-diode switchboards.
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