An optical system for wireless detuning of parallel resonant circuits

E. Y. Wong, Q. Zhang, J. L. Duerk, J. S. Lewin, M. Wendt

Research output: Contribution to journalArticlepeer-review

58 Scopus citations


A new optical method of detuning parallel resonant circuits is described. This method involves the integration of a photoresistor in parallel with the inductor and capacitor of a parallel resonant circuit, in this case a magnetic resonance imaging (MRI) receiver coil. A fiberoptic cable extending the length of the interventional device is used in conjunction with an external light source to deliver light to the photoresistor. Exposing the photoresistor to light changes its bulk resistance and greatly lowers the Q of the parallel resonant circuit, effectively detuning it. By combining this optical detuning scheme with inductive coupling of the interventional device-mounted microcoils to a standard MRI coil, a completely wireless device for active device tracking has been created. This new device improves on current technology by simplifying device complexity and reducing patient risk by eliminating the need for electrical connections between the device-mounted microcoils to the MR receiver channel. 632-638 (C) 2000 Wiley-Liss, Inc.

Original languageEnglish (US)
Pages (from-to)632-638
Number of pages7
JournalJournal of Magnetic Resonance Imaging
Issue number4
StatePublished - 2000
Externally publishedYes


  • Active device tracking
  • Interventional MRI
  • Optical detuning
  • Patient safety

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging


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