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Related Experiment Videos

Motion artifacts reduction in DWI using navigator echoes: a robust and simple correction scheme

P Latta1, V Jellús, L Budinský

  • 1Institute of Measurement Science SAS, Bratislava, Slovakia. umerlatt@savba.sk

Magma (New York, N.Y.)
|January 7, 1999
PubMed
Summary
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Motion during diffusion-weighted imaging (DWI) causes artifacts. This study introduces a novel time-domain algorithm for phase error correction, improving image quality and reducing motion-induced artifacts in DWI.

Area of Science:

  • Medical Imaging
  • Biophysics
  • Magnetic Resonance Imaging

Background:

  • Macroscopic motion during diffusion gradients in diffusion-weighted imaging (DWI) causes NMR signal phase variation.
  • This phase error leads to severe ghost artifacts in 2D Fourier Transform (2DFT) images.
  • The navigator echo technique is a known method for motion correction in DWI.

Purpose of the Study:

  • To present a simple algorithm for evaluating and correcting motion-induced phase errors in DWI.
  • To improve the correction of motional artifacts compared to existing methods.
  • To minimize sensitivity to noise and experimental setup inaccuracies.

Main Methods:

  • Development of a novel time-domain algorithm for phase error evaluation and correction.

Related Experiment Videos

  • Utilizing navigator echoes to estimate phase errors (zero and first order).
  • Correction applied in the time domain, avoiding Fourier transform in the readout direction.

    • Main Results:

    • The proposed algorithm enables effective evaluation and correction of phase errors in the time domain.
    • This approach offers improved correction of motional artifacts in DWI.
    • The method demonstrates minimized sensitivity to noise and experimental setup.

    Conclusions:

    • A simple time-domain algorithm effectively corrects motion-induced phase errors in DWI.
    • This technique enhances image quality by reducing ghost artifacts.
    • The algorithm provides a robust and less sensitive alternative for motion correction in diffusion-weighted imaging.