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Piezoelectric‐controlled tuning capacitor for surface coils
Author(s) -
Hyde James S.,
Rilling Robert J.,
Jesmanowicz A.,
Kneeland J. Bruce
Publication year - 1989
Publication title -
magnetic resonance in medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.696
H-Index - 225
eISSN - 1522-2594
pISSN - 0740-3194
DOI - 10.1002/mrm.1910120106
Subject(s) - capacitor , electromagnetic coil , transmission line , piezoelectricity , quality (philosophy) , acoustics , line (geometry) , materials science , electrical engineering , nuclear magnetic resonance , physics , voltage , engineering , geometry , mathematics , quantum mechanics
The design of a piezoelectric‐controlled trimmer capacitor and its use as a tuning element of an MRI surface coil at 63.8 MHz are described. It is found that image quality does not depend strongly on match of the coil to the transmission line but that tuning can be a significant factor. The work is intended to lead eventually to an automatic frequency control circuit in which the capacitor serves as the active element in holding the resonant frequency of the nuclei and the resonant frequency of the coil in coincidence. © 1989 Academic Press, Inc.