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Related Experiment Videos

Aortic and mitral regurgitation: quantification using moving slice velocity mapping.

S Kozerke1, J Schwitter, E M Pedersen

  • 1Institute of Biomedical Engineering, University of Zurich and Swiss Federal Institute of Technology, Zurich, Switzerland.

Journal of Magnetic Resonance Imaging : JMRI
|July 31, 2001
PubMed
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Quantifying heart valve regurgitation is crucial. A new moving slice velocity mapping technique accurately measures regurgitant volumes by correcting for through-plane motion, improving assessment of aortic and mitral regurgitation severity.

Area of Science:

  • Cardiovascular imaging
  • Medical physics
  • Cardiac diagnostics

Background:

  • Accurate quantification of regurgitant volumes is essential for assessing valvular insufficiency severity.
  • Existing methods struggle with reliable slice positioning and are affected by through-plane motion, leading to velocity offsets.

Purpose of the Study:

  • To apply and validate the moving slice velocity mapping technique for quantifying mitral and aortic regurgitation.
  • To assess the impact of correcting for through-plane motion on regurgitant fraction calculations.

Main Methods:

  • Employed a moving slice velocity mapping technique with navigator-based respiratory artifact suppression and prospective k-space reordering.
  • Applied the technique to 12 patients with aortic insufficiency and 3 with mitral insufficiency.

Related Experiment Videos

  • Calculated aortic regurgitant volumes and indirectly assessed mitral regurgitant flow, comparing corrected and uncorrected data.

    • Main Results:

    • Demonstrated successful application of the moving slice velocity mapping technique in patients with aortic and mitral regurgitation.
    • Showed significant differences in regurgitant fractions when correcting for through-plane motion, especially in mild/moderate aortic (60%/15%) and moderate-to-severe mitral (19%) regurgitation.
    • Highlighted the importance of motion correction, with smaller differences in severe aortic regurgitation (7%).

    Conclusions:

    • The moving slice velocity mapping technique is effective for quantifying mitral and aortic regurgitation.
    • Correction for valvular through-plane motion is critical for accurate regurgitant volume assessment.
    • This technique improves the reliability of severity grading for valvular insufficiency.