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Hybrid monopole/loop coil array for human head MR imaging at 7T.

Xinqiang Yan1, Long Wei2, Rong Xue3

  • 1Key Laboratory of Nuclear Radiation and Nuclear Energy Technology, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China ; Beijing Engineering Research Center of Radiographic Techniques and Equipment, Beijing 100049, China ; State Key Laboratory of Brain and Cognitive Science, Beijing MRI Center for Brain Research, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, China.

Applied Magnetic Resonance
|June 30, 2015
PubMed
Summary

A novel hybrid monopole and loop radiofrequency (RF) coil array offers superior performance for 7T human head MRI. This new design achieves higher signal-to-noise ratio (SNR) and better parallel imaging capabilities.

Keywords:
HybridRF coilarraydecoupleloopmonopoleparallel imagingultrahigh field MRI

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Area of Science:

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

Background:

  • Monopole and loop coils possess orthogonal RF fields, enabling intrinsic electromagnetic decoupling when properly arranged.
  • Combining loop and monopole arrays offers potential advantages for MR imaging applications.

Purpose of the Study:

  • To develop and evaluate a hybrid monopole/loop RF coil array for ultrahigh field (7T) human head MRI.
  • To assess the imaging performance, including SNR and parallel imaging capabilities, of the hybrid array compared to standalone monopole and loop arrays.

Main Methods:

  • A hybrid RF coil array with 4 monopole and 4 loop channels was constructed for 7T MRI.
  • In vivo human head MR imaging was performed using monopole-only, loop-only, and the full hybrid array configurations.
  • Image quality metrics, including SNR and g-factor for parallel imaging, were evaluated.

Main Results:

  • The hybrid monopole/loop array demonstrated significantly higher SNR compared to monopole-only and loop-only configurations.
  • The hybrid array exhibited superior parallel imaging performance, indicated by lower g-factor values.
  • Excellent SNR and low g-factor were achieved across both the periphery and center of the brain.

Conclusions:

  • The proposed hybrid monopole/loop array effectively combines the benefits of both coil types for enhanced 7T head MRI.
  • Sufficient electromagnetic decoupling and diverse RF field distributions contribute to the improved performance.
  • This hybrid coil design is valuable for achieving high-quality human head imaging at ultrahigh magnetic fields.