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Introduction:Magnetic Resonance Imaging, or MRI, can include a specialized imaging technique of the urinary system known as Magnetic Resonance Urography (MRU). This radiation-free technique uses strong magnetic fields and radio waves to produce detailed images with the help of a computer. MRU is particularly effective for visualizing fluid-filled structures like the kidneys, ureters, and bladder.Applications of MRI in the Genitourinary SystemKidneys and Ureters: MRI detects tumors, cysts,...
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Open birdcage coil for head imaging at 7T.

Anton V Nikulin1, Alexandre Vignaud2, Nikolai I Avdievich3

  • 1Institut Langevin, ESPCI Paris, CNRS, PSL University, Paris, France.

Magnetic Resonance in Medicine
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A novel opencage coil design for 7 Tesla brain imaging enhances patient comfort and functional MRI capabilities. This innovative birdcage coil geometry maintains performance while improving usability for research and clinical applications.

Keywords:
birdcage coilbrain imaginghead coilopen coilultra-high field MRI

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Area of Science:

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

Background:

  • Conventional birdcage coils face limitations in patient comfort and functional MRI integration.
  • Improving RF coil design is crucial for advancing high-field MRI applications.
  • Existing designs may compromise homogeneity or efficiency with modifications.

Purpose of the Study:

  • To develop and validate a new birdcage coil geometry for 7 Tesla (T) brain imaging.
  • The design aims to incorporate a large top window for enhanced patient comfort and functional MRI stimulus presentation.
  • To ensure the new geometry does not compromise RF field homogeneity and transmit efficiency.

Main Methods:

  • Theoretical description and design using the transfer matrix approach for a nonperiodic rung distribution.
  • Full-wave simulations for coil adjustment and optimization.
  • Experimental assembly, fine-tuning, matching, and validation on phantoms and in vivo.

Main Results:

  • Optimized coil demonstrated good isolation (-14.9 dB) and symmetric circular polarized mode pattern.
  • Experimental assessment confirmed competitive transmit efficiency and coverage compared to conventional coils.
  • The opencage design maintained key performance metrics without significant degradation.

Conclusions:

  • The proposed opencage coil is feasible for 7T brain imaging without compromising performance.
  • Key parameters like B1 field homogeneity, transmit efficiency, and SAR were preserved.
  • This design offers improved patient comfort and opens possibilities for enhanced fMRI studies and motion correction.