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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