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Planar strip array (PSA) for MRI.

R F Lee1, C R Westgate, R G Weiss

  • 1Division of MR Research, Department of Radiology, Johns Hopkins University, Baltimore, Maryland, USA. lee@crd.ge.com

Magnetic Resonance in Medicine
|April 3, 2001
PubMed
Summary
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A new planar strip array (PSA) detector eliminates coil coupling issues in parallel MRI. This advancement enables a higher number of detectors for faster MRI scans with improved signal quality.

Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Electromagnetics
  • Detector Array Technology

Background:

  • Parallel MRI techniques require numerous detectors for faster imaging.
  • Conventional phased arrays have limitations due to coil structure and mutual coupling.
  • These limitations restrict the number of coils and potential scan time reduction.

Purpose of the Study:

  • To introduce a novel near-field MRI detector array, the planar strip array (PSA).
  • To address and eliminate coupling problems in conventional phased arrays.
  • To enable a larger number of detectors for high-frequency MRI and reduced scan times.

Main Methods:

  • Developed a planar strip array (PSA) using parallel microstrips on a high permittivity substrate.
  • Analyzed electromagnetic wave behavior and strip coupling based on strip length and wavelength.

Related Experiment Videos

  • Conducted measurements on a prototype PSA and performed phantom and human MRI experiments at 1.5 T.

    • Main Results:

    • Demonstrated vanishing inter-strip coupling when strip lengths are specific fractions of the electromagnetic wavelength.
    • Achieved high quality factor and signal-to-noise ratio with properly terminated, tuned, and matched PSA elements.
    • Validated performance in both conventional and parallel-encoded MRI at 1.5 T.

    Conclusions:

    • The planar strip array (PSA) effectively overcomes coupling limitations of conventional phased arrays.
    • PSA technology supports a significantly larger number of detectors, enhancing parallel MRI capabilities.
    • This innovation promises reduced MRI scan times and improved image quality.