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4T split TEM volume head and knee coils for improved sensitivity and patient accessibility.

Nikolai I Avdievich1, Ken Bradshaw, Jing-Huei Lee

  • 1Department of Radiology, Albert Einstein College of Medicine, Bronx, NY, USA. nikolai.avdievich@yale.edu

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|May 30, 2007
PubMed
Summary

Split transverse electromagnetic (TEM) volume coils improve patient access in MRI by eliminating direct electrical connections. This study demonstrates that splitting the shield can be compensated for, retaining performance and enhancing knee imaging sensitivity by 15-20%.

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Area of Science:

  • Magnetic Resonance Imaging (MRI) hardware development
  • Radiofrequency (RF) coil engineering
  • Medical imaging physics

Background:

  • Split RF coils enhance patient access by avoiding the need to slide coils over the region of interest.
  • Unshielded birdcage coils require direct electrical connections between halves due to end ring currents.
  • High-field (>3T) shielded birdcage coils necessitate splitting both the shield and coil with reliable electrical connections.

Purpose of the Study:

  • To investigate the feasibility and performance of split transverse electromagnetic (TEM) volume coils for MRI.
  • To demonstrate compensation techniques for split shields in head and knee TEM coils.
  • To evaluate the impact of improved access on coil design and imaging sensitivity.

Main Methods:

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  • Utilized split transverse electromagnetic (TEM) volume coil designs for head and knee imaging.
  • Developed methods to compensate for the effects of splitting the coil shield.
  • Compared performance metrics of split TEM coils against conventional designs.

    • Main Results:

    • Demonstrated that splitting the shield of TEM coils can be compensated for, retaining coil performance.
    • Achieved improved patient access with split TEM coils.
    • For knee imaging, reduced coil diameter due to improved access enhanced sensitivity by 15-20%.

    Conclusions:

    • Split TEM volume coils offer a viable alternative to traditional birdcage coils, especially for high-field MRI.
    • Compensation techniques effectively mitigate issues associated with split shields in TEM coils.
    • Split TEM coils provide enhanced sensitivity and improved patient access, particularly beneficial for specific anatomical regions like the knee.