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Related Experiment Videos

Optimized quadrature surface coil designs.

Ananda Kumar1, Paul A Bottomley

  • 1Department of Radiology and Electrical and Computer Engineering, Johns Hopkins University, Division of MR research, 601 N. Caroline Street, JHOC room 4243, Baltimore, MD 21287, USA. ankumar@mri.jhu.edu

Magma (New York, N.Y.)
|December 7, 2007
PubMed
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New design rules for figure-8 and butterfly coils optimize magnetic resonance imaging (MRI) detectors. These optimized coils improve signal-to-noise ratio (SNR) for better imaging performance.

Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Electromagnetics
  • Coil Design

Background:

  • Quadrature surface detectors using loop, figure-8, or butterfly coils enhance signal-to-noise ratio (SNR) in MRI/MRS compared to single coils.
  • These detectors also reduce power and specific absorption rates (SAR) during MRI excitation.
  • Optimal loop coil radius for depth-dependent MRI is known, but optimal geometries for figure-8 and butterfly coils are not.

Purpose of the Study:

  • To determine the optimal geometries for figure-8 and butterfly coils for improved SNR in MRI.
  • To compare the SNR performance of novel quadrature detectors with existing configurations.

Main Methods:

  • Numerical determination of optimal figure-8 and square butterfly coil geometries using the electromagnetic method of moments.

Related Experiment Videos

  • Creation of SNR-optimized quadrature detectors by combining figure-8 and loop detectors.
  • Comparison of theoretical and experimental SNR performance against a strip-loop detector and two overlapped loops at 3 Tesla (T).

    • Main Results:

    • The SNR-optimized figure-8 detector features a loop radius (r8) of approximately 0.6d, with r8/r0 approximately 1.3 in an optimized quadrature detector at 3 T.
    • The optimized butterfly coil has a side length of approximately d and a crossover angle greater than or equal to 150 degrees.
    • Analysis of quadrature detection efficiency and local SAR during transmission for different configurations.

    Conclusions:

    • New design rules for figure-8 and butterfly coils have been established.
    • These rules optimize the performance of these coils as both linear and quadrature detectors in MRI applications.