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Intraluminal MRI Probe Using Small Size Variable Capacitor
Author(s) -
MATSUNAGA TADAO,
MATSUOKA YUICHIRO,
NAKAZONO MASAYOSHI,
KURODA KAGAYAKI,
ESASHI MASAYOSHI,
HAGA YOICHI
Publication year - 2017
Publication title -
electronics and communications in japan
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.131
H-Index - 13
eISSN - 1942-9541
pISSN - 1942-9533
DOI - 10.1002/ecj.11932
Subject(s) - imaging phantom , capacitor , variable capacitor , scanner , magnetic resonance imaging , materials science , voltage , impedance matching , signal (programming language) , electrical impedance , biomedical engineering , signal to noise ratio (imaging) , nuclear magnetic resonance , physics , optics , computer science , engineering , medicine , radiology , quantum mechanics , programming language
SUMMARY An intraluminal magnetic resonance imaging (MRI) probe holds promise to achieve a higher resolution image of a small pathological lesion than conventional external probes. Such an intraluminal probe requires precise resonant frequency tuning to 63.865 MHz and impedance matching to 50 Ω, if used for instance in a 1.5‐T scanner. Tuning and matching have to be performed after inserted into the subject body as electric permittivity varies according to the tissue location. Thus, in this study, a novel intraluminal MRI probe, which can be tuned and matched remotely by voltage‐controlled, MOSFET‐type variable capacitors was developed and fabricated. The imaging capability and signal‐to‐noise ratio (SNR) was evaluated in an agar phantom.