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Related Experiment Videos

Partially parallel imaging with localized sensitivities (PILS).

M A Griswold1, P M Jakob, M Nittka

  • 1Department of Physics, University of Würzburg, Würzburg, Germany. mark@physik.uni-wuerzberg.de

Magnetic Resonance in Medicine
|October 12, 2000
PubMed
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A new method called Parallel Imaging with Localized Sensitivities (PILS) accelerates MRI scans by assuming localized coil sensitivities. This technique simplifies reconstruction, requiring only two parameters per coil for faster, efficient imaging.

Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Medical Imaging Technology
  • Signal Processing

Background:

  • Accelerated MRI acquisition is crucial for reducing scan times and improving patient comfort.
  • Existing parallel imaging techniques often require accurate RF field maps, complicating implementation.
  • Coil sensitivity variations are inherent in RF coil arrays used for spatial encoding.

Purpose of the Study:

  • To introduce and evaluate a novel partially parallel acquisition method, Parallel Imaging with Localized Sensitivities (PILS).
  • To demonstrate that PILS can accelerate image acquisition without needing detailed RF field maps.
  • To assess the practical implementation aspects of PILS, including parameter determination and image quality.

Main Methods:

  • Development of the PILS technique, which assumes localized RF coil sensitivity patterns.

Related Experiment Videos

  • Characterization of each coil using only the center and width of its sensitivity region.
  • Application of a localized Fourier transform incorporating coil parameters for image reconstruction.
  • Evaluation of signal-to-noise ratio (SNR) and artifact power for PILS images.

    • Main Results:

    • PILS enables reconstruction of full field-of-view (FOV) images using reduced phase encoding steps.
    • The method bypasses the need for precise RF field mapping.
    • Practical implementation considerations, including coil parameter estimation, were addressed.
    • In vivo imaging demonstrated the feasibility and utility of the PILS technique.

    Conclusions:

    • Parallel Imaging with Localized Sensitivities (PILS) offers an effective approach to accelerate MRI acquisition.
    • The simplified coil characterization in PILS facilitates practical implementation.
    • PILS shows promise for routine clinical use in accelerating imaging procedures.