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Related Experiment Video

Updated: Jan 20, 2026

Energy Stored In A Coaxial Cable
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Shielded-coaxial-cable coils as receive and transceive array elements for 7T human MRI.

Thomas Ruytenberg1, Andrew Webb1, Irena Zivkovic1

  • 1C.J. Gorter Center for High Field MRI, Department of Radiology, Leiden University Medical Center, Leiden, The Netherlands.

Magnetic Resonance in Medicine
|September 5, 2019
PubMed
Summary

Shielded-coaxial-cable (SCC) coils offer superior inter-element decoupling in multi-channel 7T human MRI arrays compared to conventional loop coils. These flexible SCC coils are ideal for adjustable array construction, maintaining performance under flexion.

Keywords:
7T arrayscoaxial coilstransceive coils

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Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Coil Engineering
  • Radiofrequency (RF) Coil Design

Background:

  • Multi-channel arrays are crucial for high-field MRI (7T) to improve signal-to-noise ratio and parallel imaging capabilities.
  • Conventional loop coils face challenges with inter-element coupling and mechanical flexibility in high-density arrays.
  • Shielded-coaxial-cable (SCC) coils present a novel design for MRI coil elements.

Purpose of the Study:

  • To evaluate shielded-coaxial-cable (SCC) coils as components for 7T human MRI receive-only and transceive arrays.
  • To compare the performance of SCC coils against conventional loop coils of similar size.
  • To assess inter-element decoupling, transmit efficiency, and thermal properties of SCC coil arrays.

Main Methods:

  • Constructed three multi-channel arrays: a 4-channel receive-only, an 8-channel transceive, and a 5-channel transceive array using SCC elements.
  • Characterized inter-element decoupling using measured noise correlation matrices under static and flexed conditions.
  • Evaluated transmit efficiency, sample heating via thermal measurements, and acquired in vivo images.

Main Results:

  • SCC and conventional loop coils exhibited similar measured and simulated B1+ maps.
  • SCC coil arrays demonstrated significantly greater inter-element decoupling compared to conventional arrays.
  • Low coupling coefficients (< -10 dB) and minimal frequency shifts were observed in SCC arrays, even under substantial flexion.

Conclusions:

  • SCC coil elements provide superior mechanical flexibility and are less sensitive to shape deformation than conventional loop coils.
  • The enhanced decoupling and flexibility make SCC coils highly suitable for constructing size-adjustable multi-channel MRI arrays.
  • SCC coils represent a promising advancement for high-performance 7T human MRI array design.