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MR spectroscopy using multi-ring surface coils.

S B King1, L N Ryner, B Tomanek

  • 1Institute for Biodiagnostics, National Research Council of Canada, Winnipeg, Canada.

Magnetic Resonance in Medicine
|September 30, 1999
PubMed
Summary
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New multi-ring surface coils offer a solution for magnetic resonance spectroscopy (MRS) when volume coils are unavailable. These coils provide a uniform B(1)-field, improving quantitative metabolite concentration measurements and spectral quality.

Area of Science:

  • Magnetic Resonance Imaging and Spectroscopy
  • Radiofrequency Coil Design

Background:

  • Spatially uniform B(1)-fields are crucial for accurate MR imaging and spectroscopy.
  • Volume coils are not always available or suitable for all applications, leading to challenges in quantitative MRS due to non-uniform coil responses.
  • Standard single-loop surface coils offer high signal-to-noise ratio (SNR) but suffer from poor B(1) field homogeneity.

Purpose of the Study:

  • To introduce and evaluate novel multi-ring surface coils designed to produce a locally uniform B(1) field.
  • To assess the performance of these coils in MR spectroscopy compared to traditional volume and surface coils.
  • To determine if these coils can overcome the limitations of existing coil technologies for quantitative MRS.

Main Methods:

  • Development of two and three-ring surface coil designs.

Related Experiment Videos

  • MR spectroscopy experiments were conducted using the proposed multi-ring coils.
  • Comparison of spatial localization, RF power requirements, SNR, water suppression, and specific absorption rate (SAR) against standard volume and single-loop surface coils.

    • Main Results:

    • The multi-ring coils produced a locally uniform B(1) field, comparable in sensitivity and power requirements to standard surface coils.
    • MR spectroscopy with multi-ring coils achieved spatial localization similar to volume coils.
    • Compared to standard surface coils, multi-ring coils demonstrated improved water suppression, localization, and reduced outer voxel contamination, with only a minor SNR loss and moderate SAR increase.

    Conclusions:

    • Multi-ring surface coils represent a hybrid technology, bridging the gap between volume and standard surface coils.
    • These coils offer a practical solution for applications requiring a uniform B(1) field when volume coils are not feasible.
    • The proposed coils enhance quantitative MRS by providing improved B(1) homogeneity and localization characteristics.