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Valvular regurgitation: dynamic MR imaging.

J A Utz1, R J Herfkens, J A Heinsimer

  • 1Department of Radiology, Duke University Medical Center, Durham, NC 27710.

Radiology
|July 1, 1988
PubMed
Summary
This summary is machine-generated.

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Cine magnetic resonance (MR) imaging detects valvular regurgitation by identifying signal loss related to blood flow turbulence. This new technique shows promise for diagnosing valve incompetence with high sensitivity.

Area of Science:

  • Cardiovascular Imaging
  • Medical Physics
  • Diagnostic Radiology

Background:

  • Valvular heart disease diagnosis relies on imaging modalities.
  • Accurate assessment of valvular incompetence is crucial for patient management.
  • Novel imaging techniques are needed to improve diagnostic capabilities.

Purpose of the Study:

  • To evaluate the efficacy of cine magnetic resonance (MR) imaging in detecting valvular regurgitation.
  • To compare cine MR imaging findings with established diagnostic methods like Doppler echocardiography and cardiac catheterization.
  • To assess the sensitivity of cine MR imaging to blood flow turbulence associated with valvular incompetence.

Main Methods:

  • Cine magnetic resonance (MR) imaging was performed using short repetition times, limited flip angles, gradient refocused echoes, and cardiac gating.

Related Experiment Videos

  • Temporal resolution achieved up to 32 time frames per cardiac cycle.
  • Images of 56 valves in 27 patients were analyzed and compared with Doppler echocardiograms or cardiac catheterization.

    • Main Results:

    • An area of decreased signal, correlating with regurgitant blood flow, was observed in all 20 cases with confirmed valvular incompetence.
    • This abnormality was also detected in 9 out of 36 cases without diagnosed valvular incompetence.
    • The technique demonstrated sensitivity to turbulent blood flow patterns.

    Conclusions:

    • Cine MR imaging shows potential as a sensitive tool for detecting valvular regurgitation.
    • The observed signal abnormalities may indicate sensitivity to blood flow turbulence, a marker of valvular incompetence.
    • Further research is warranted to establish the full clinical utility of cine MR imaging in valvular assessment.