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Abstract #4830

Automation system based on piezoelectric motor for tuning and matching miniature monolithic NMR coils

Zhoujian Li 1 , Georges Willoquet 1 , Marie Poirier-Quinot 1 , Luc Darrasse 1 , and Jean-christophe Ginefri 1

1 Imagerie par Rsonance Magntique Mdicale et Multi-Modalits (IR4M), UMR8081 CNRS, Univ. Paris Sud, Orsay, France

An automation system based on a piezoelectric motor that offers high resolution displacement is developed to automatically tune and match miniature monolithic coils used in MR microscopy. Tuning is done by approaching a dielectric slice to shift down the resonant frequency and matching is achieved by inductive coupling to a pick-up loop. The piezo-motor is driven by a dedicated board, which communicates with control software for automation. The resolution achieved by the developed system allows automatic matching and tuning with respect to specified matching level and target frequency with configurable tolerance.

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