Inductively coupled wireless RF coil arrays

S. B. Bulumulla, E. Fiveland, K. J. Park, T. K. Foo, C. J. Hardy

Research output: Contribution to journalArticle

Abstract

As the number of coils increases in multi-channel MRI receiver-coil arrays, RF cables and connectors become increasingly bulky and heavy, degrading patient comfort and slowing workflow. Inductive coupling of signals provides an attractive "wireless" approach, with the potential to reduce coil weight and cost while simplifying patient setup. In this work, multi-channel inductively coupled anterior arrays were developed and characterized for 1.5. T imaging. These comprised MR receiver coils inductively (or "wirelessly") linked to secondary or "sniffer" coils whose outputs were transmitted via preamps to the MR system cabinet. The induced currents in the imaging coils were blocked by passive diode circuits during RF transmit. The imaging arrays were totally passive, obviating the need to deliver power to the coils, and providing lightweight, untethered signal reception with easily positioned coils. Single-shot fast spin echo images were acquired from 5 volunteers using a 7-element inductively coupled coil array and a conventionally cabled 7-element coil array of identical geometry, with the inductively-coupled array showing a relative signal-to-noise ratio of 0.86 +/- 0.07. The concept was extended to a larger 9-element coil array to demonstrate the effect of coil element size on signal transfer and RF-transmit blocking.

Original languageEnglish (US)
Pages (from-to)351-357
Number of pages7
JournalMagnetic Resonance Imaging
Volume33
Issue number3
DOIs
StatePublished - Apr 1 2015
Externally publishedYes

Keywords

  • Inductive coupling
  • Phased array coils
  • Wireless coils
  • Wireless MRI

ASJC Scopus subject areas

  • Biophysics
  • Radiology Nuclear Medicine and imaging
  • Biomedical Engineering
  • Medicine(all)

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  • Cite this

    Bulumulla, S. B., Fiveland, E., Park, K. J., Foo, T. K., & Hardy, C. J. (2015). Inductively coupled wireless RF coil arrays. Magnetic Resonance Imaging, 33(3), 351-357. https://doi.org/10.1016/j.mri.2014.12.004