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Subwavelength dielectric waveguide for efficient travelling-wave magnetic resonance imaging

Author

Listed:
  • Yang Gao

    (Xidian University
    Xidian University
    Zhejiang University)

  • Tong Liu

    (Xidian University)

  • Tao Hong

    (Xidian University
    Xidian University)

  • Youtong Fang

    (Zhejiang University)

  • Wen Jiang

    (Xidian University
    Xidian University)

  • Xiaotong Zhang

    (Zhejiang University
    Second Affiliated Hospital of Zhejiang University School of Medicine
    Zhejiang University
    Zhejiang University)

Abstract

Magnetic resonance imaging (MRI) has diverse applications in physics, biology, and medicine. Uniform excitation of nuclei spins through circular-polarized transverse magnetic component of electromagnetic field is vital for obtaining unbiased tissue contrasts. However, achieving this in the electrically large human body poses a significant challenge, especially at ultra-high fields (UHF) with increased working frequencies (≥297 MHz). Canonical volume resonators struggle to meet this challenge, while radiative excitation methods like travelling-wave (TW) show promise but often suffer from inadequate excitation efficiency. Here, we introduce a new technique using a subwavelength dielectric waveguide insert that enhances both efficiency and homogeneity at 7 T. Through TE11-to-TM11 mode conversion, power focusing, wave impedance matching, and phase velocity matching, we achieved a 114% improvement in TW efficiency and mitigated the center-brightening effect. This fundamental advancement in TW MRI through effective wave manipulation could promote the electromagnetic design of UHF MRI systems.

Suggested Citation

  • Yang Gao & Tong Liu & Tao Hong & Youtong Fang & Wen Jiang & Xiaotong Zhang, 2024. "Subwavelength dielectric waveguide for efficient travelling-wave magnetic resonance imaging," Nature Communications, Nature, vol. 15(1), pages 1-11, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-46638-5
    DOI: 10.1038/s41467-024-46638-5
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    References listed on IDEAS

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    1. Alena Shchelokova & Viacheslav Ivanov & Anna Mikhailovskaya & Egor Kretov & Ivan Sushkov & Svetlana Serebryakova & Elizaveta Nenasheva & Irina Melchakova & Pavel Belov & Alexey Slobozhanyuk & Anna And, 2020. "Ceramic resonators for targeted clinical magnetic resonance imaging of the breast," Nature Communications, Nature, vol. 11(1), pages 1-7, December.
    2. David O. Brunner & Nicola De Zanche & Jürg Fröhlich & Jan Paska & Klaas P. Pruessmann, 2009. "Travelling-wave nuclear magnetic resonance," Nature, Nature, vol. 457(7232), pages 994-998, February.
    3. Xinqiang Yan & John C. Gore & William A. Grissom, 2018. "Self-decoupled radiofrequency coils for magnetic resonance imaging," Nature Communications, Nature, vol. 9(1), pages 1-12, December.
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