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Related Experiment Videos

Correction of translational motion artifacts in multi-slice spin-echo imaging using self-calibration

L H Zang1, J Fielden, J Wilbrink

  • 1Department of Research and Engineering, Hitachi Instruments, Inc., San Jose, CA 95134.

Magnetic Resonance in Medicine
|March 1, 1993
PubMed
Summary

This study presents a novel method for correcting translational motion artifacts in multislice spin-echo MRI. The technique uses self-calibration to accurately detect and fix motion, significantly improving image quality without extra scan time.

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Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Medical Physics
  • Image Processing

Background:

  • Multislice spin-echo imaging is susceptible to in-plane bulk translational motion.
  • Motion artifacts degrade image quality and can lead to misdiagnosis.
  • Existing correction methods may require additional scan time or specialized hardware.

Purpose of the Study:

  • To develop and validate a self-calibration and postprocessing method for detecting and correcting in-plane bulk translational motion in multislice spin-echo MRI.
  • To improve the accuracy and reliability of MRI scans affected by patient movement.

Main Methods:

  • A constant phase encoding offset between slices was employed to spread low spatial frequency echoes for self-calibration.
  • Readout and phase encoding directions were interchanged for alternate slices to detect motion in both x and y directions.

Related Experiment Videos

  • Displacements were calculated using cross-correlation of echo modulus with a reference box car function; phase errors were corrected using displacement data.

    • Main Results:

    • The proposed method successfully detected and corrected in-plane translational motion in multislice spin-echo MRI.
    • Significant suppression of motion-induced artifacts was observed in knee studies at 0.5 T and 1.5 T.
    • The correction method did not require additional imaging pulses or increase acquisition time.

    Conclusions:

    • The developed self-calibration and postprocessing technique effectively corrects translational motion artifacts in multislice spin-echo MRI.
    • This method offers a practical solution for enhancing image quality in routine clinical MRI examinations.
    • The approach is easily implementable and does not impose additional constraints on MRI acquisition protocols.