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Inductively coupled wireless RF coil arrays.

S B Bulumulla1, E Fiveland1, K J Park1

  • 1GE Global Research, 1 Research Circle, K1-3C12A, Niskayuna, NY 12309.

Magnetic Resonance Imaging
|December 20, 2014
PubMed
Summary
This summary is machine-generated.

Wireless MRI receiver coils using inductive coupling reduce bulk and improve patient comfort. This novel approach offers lightweight, untethered signal reception for enhanced magnetic resonance imaging (MRI) workflows.

Keywords:
Inductive couplingPhased array coilsWireless MRIWireless coils

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Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Biomedical Engineering
  • Radiofrequency (RF) Engineering

Background:

  • Increasing multi-channel MRI receiver-coil arrays lead to bulky and heavy RF cables, impacting patient comfort and workflow.
  • Inductive coupling offers a wireless alternative to reduce coil weight, cost, and simplify patient setup in MRI.

Purpose of the Study:

  • To develop and characterize multi-channel inductively coupled anterior arrays for 1.5T MRI.
  • To evaluate the performance of wireless receiver coils compared to conventional cabled arrays.

Main Methods:

  • Developed passive, inductively coupled MR receiver coils linked to secondary 'sniffer' coils.
  • Implemented passive diode circuits to block induced currents during RF transmit.
  • Acquired single-shot fast spin echo images using 7-element inductively coupled and cabled coil arrays in 5 volunteers.

Main Results:

  • The inductively coupled array demonstrated a relative signal-to-noise ratio of 0.86 +/- 0.07 compared to the cabled array.
  • The developed arrays were passive, lightweight, and untethered, simplifying coil positioning.
  • The concept was extended to a 9-element array to assess coil element size effects.

Conclusions:

  • Inductive coupling is a viable wireless approach for multi-channel MRI receiver arrays, enhancing patient comfort and workflow.
  • Passive, inductively coupled coils offer a lightweight and untethered solution for MRI signal reception.
  • Further studies can optimize coil element design for improved signal transfer and RF transmit blocking.