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Method for measuring three-dimensional motion with tagged MR imaging.

J G Pipe1, J L Boes, T L Chenevert

  • 1Department of Radiology, University of Michigan Medical Center, Ann Arbor 48109-0553.

Radiology
|November 1, 1991
PubMed
Summary
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This study introduces a 3D magnetic resonance imaging technique to measure tissue motion. The method accurately quantizes three-dimensional displacements, enhancing analysis of cardiac and skeletal muscle dynamics.

Area of Science:

  • Medical Imaging
  • Biophysics
  • Cardiovascular Research

Background:

  • Current magnetic resonance imaging (MRI) techniques can measure 2D tissue displacement using saturation grids.
  • Measuring motion in the third dimension (normal to the imaging plane) is crucial for comprehensive biomechanical analysis.

Purpose of the Study:

  • To extend MRI techniques for accurate measurement of three-dimensional (3D) tissue motion.
  • To validate the accuracy of this 3D motion measurement technique.
  • To apply the technique to analyze motion in cardiac and skeletal muscles.

Main Methods:

  • Utilized a grid of saturation planes in MRI, with a second acquisition tilting the grid to capture motion normal to the imaging plane.
  • Employed a rotating phantom to quantitatively verify the accuracy of the 3D motion measurements.

Related Experiment Videos

  • Applied the validated technique to assess 3D displacements in the heart wall and skeletal muscle.

    • Main Results:

    • Phantom studies demonstrated that measuring motion in the z-direction (normal to the plane) achieved accuracy comparable to x and y motion measurements.
    • Successfully visualized and quantified 3D displacements of the heart wall and skeletal muscle.
    • The developed technique provides accurate quantification of motion in all three dimensions.

    Conclusions:

    • The extended MRI technique enables accurate measurement of 3D tissue motion, including motion normal to the imaging plane.
    • This advancement offers a more complete analysis of complex biomechanical behaviors, such as heart wall motion and contraction.
    • The findings support the utility of 3D MRI motion analysis in cardiovascular and musculoskeletal research.