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Related Experiment Videos

Adaptive technique for three-dimensional MR imaging of moving structures.

H W Korin1, J P Felmlee, R L Ehman

  • 1Department of Diagnostic Radiology, Mayo Clinic, Rochester, MN 55905.

Radiology
|October 1, 1990
PubMed
Summary

This study introduces an adaptive motion correction technique for 3D MRI scans. The method uses navigator echoes to correct motion-induced artifacts, improving image quality for mobile subjects.

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Area of Science:

  • Medical Imaging
  • Magnetic Resonance Imaging
  • Image Processing

Background:

  • Three-dimensional (3D) magnetic resonance (MR) imaging offers superior visualization but is prone to motion artifacts.
  • Motion during imaging corrupts data, limiting 3D MR's use for mobile structures and patients.
  • Longer scan times in 3D imaging exacerbate issues for patients prone to movement.

Purpose of the Study:

  • To develop an adaptive motion correction method for 3D MR imaging.
  • To mitigate image corruption caused by patient or subject motion.
  • To enhance the utility of 3D MR imaging for dynamic or uncooperative subjects.

Main Methods:

  • The technique employs interleaved "navigator" echoes acquired alongside image data.
  • Navigator echoes provide real-time displacement measurements for each image echo.

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  • Image data is corrected based on the measured displacements, assuming a motion model.

    • Main Results:

    • The proposed method effectively measures motion during 3D MR acquisition.
    • Correction based on navigator echoes significantly reduces motion-induced artifacts.
    • Excellent image quality is achievable when the motion is accurately modeled.

    Conclusions:

    • Adaptive motion correction using navigator echoes is a viable strategy for 3D MR imaging.
    • This technique broadens the applicability of 3D MR imaging in clinical and research settings.
    • Further refinement of motion modeling can optimize results for complex movements.