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Related Experiment Video

Updated: Sep 6, 2025

Magnetic Resonance Imaging of Multiple Sclerosis at 7.0 Tesla
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Magnetic Resonance Imaging of Multiple Sclerosis at 7.0 Tesla

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A 32-element loop/dipole hybrid array for human head imaging at 7 T.

Nikolai I Avdievich1, Anton V Nikulin1,2, Loreen Ruhm1

  • 1High-Field MR Center, Max Planck Institute for Biological Cybernetics, Tübingen, Germany.

Magnetic Resonance in Medicine
|June 29, 2022
PubMed
Summary

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Deuterium 1-Channel Transmit/16-Channel High Impedance Receive Array Combined With 16-Channel <sup>1</sup>H Dual-Row Transceiver Array for 7 Tesla Brain Imaging.

Magnetic resonance in medicine·2026
This summary is machine-generated.

A new 32-element hybrid head array coil significantly boosts signal-to-noise ratio (SNR) at 7 Tesla. This novel design improves both central and peripheral SNR, offering better performance for brain imaging.

Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Biomedical Engineering
  • Radiology

Background:

  • Improving whole-brain signal-to-noise ratio (SNR) is crucial for high-field MRI, especially at 7 Tesla.
  • Existing commercial array coils face limitations in optimizing SNR across the entire brain volume.

Purpose of the Study:

  • To develop and evaluate a novel 32-element hybrid human head array coil for enhanced whole-brain SNR at 7 Tesla.

Main Methods:

  • A hybrid design combining transceive (TxRx) dipole antennas and receive-only (Rx) loop elements was employed.
  • The array integrated 8 TxRx-dipoles and 24 Rx-loops in a single layer on a tight-fit helmet.
  • Design strategy focused on intrinsic SNR theory and minimizing element count.

Main Results:

Keywords:
central SNR enhancementfolded-end dipolehuman head arrayhybrid array coilultimate intrinsic SNRultrahigh field MRI

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  • The hybrid array demonstrated significant in vivo SNR improvements: ~20% centrally and 20-80% peripherally compared to a commercial 8Tx/32Rx coil.
  • Addition of dipole structures to loop elements further enhanced central SNR.
  • The new coil achieved ~15% higher transmit (Tx) efficiency and better longitudinal coverage.

Conclusions:

  • The developed hybrid array coil effectively combines complementary TxRx and Rx resonant structures (dipoles and loops) in a single layer.
  • This strategy enhances both SNR and transmit performance while simplifying coil design.
  • The novel coil offers a more robust and improved solution for 7T brain imaging.