Intraluminal MRI probe using small size variable capacitor

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

Research output: Contribution to journalArticlepeer-review


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 languageEnglish
Pages (from-to)153-159
Number of pages7
JournalIEEJ Transactions on Sensors and Micromachines
Issue number5
Publication statusPublished - 2016


  • Intraluminal MRI probe
  • Minimally invasive therapy
  • MRI
  • Non-planar photofabrication
  • Receive coil
  • Variable capacitor


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