Intraluminal MRI Probe Using Small Size Variable Capacitor

Tadao Matsunaga; Yuichiro Matsuoka; Masayoshi Nakazono; Kagayaki Kuroda; Masayoshi Esashi; Yoichi Haga

doi:10.1002/ecj.11932

Intraluminal MRI Probe Using Small Size Variable Capacitor

Tadao Matsunaga, Yuichiro Matsuoka, Masayoshi Nakazono, Kagayaki Kuroda, Masayoshi Esashi, Yoichi Haga

Research output: Contribution to journal › Article › peer-review

Abstract

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.

Original language	English
Pages (from-to)	29-38
Number of pages	10
Journal	Electronics and Communications in Japan
Volume	100
Issue number	3
DOIs	https://doi.org/10.1002/ecj.11932
Publication status	Published - 2017 Mar 1

Keywords

MRI, nonplaner photofabrication
intraluminal MRI probe
minimally invasive therapy
receive coil
variable capacitor

ASJC Scopus subject areas

Signal Processing
Physics and Astronomy(all)
Computer Networks and Communications
Electrical and Electronic Engineering
Applied Mathematics

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10.1002/ecj.11932

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abstract = "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.",

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AU - Esashi, Masayoshi

AU - Haga, Yoichi

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