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Related Experiment Videos

Aortic regurgitation: quantitation with MR imaging velocity mapping

N Honda1, K Machida, M Hashimoto

  • 1Department of Radiology, Saitama Medical Center, Saitama Medical School, Japan.

Radiology
|January 1, 1993
PubMed
Summary

Magnetic resonance (MR) imaging velocity mapping offers a reproducible, noninvasive method for quantifying aortic regurgitation (AR). This technique accurately measures forward and regurgitant flow, showing excellent agreement with other diagnostic methods.

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Area of Science:

  • Cardiovascular Imaging
  • Medical Physics

Background:

  • Aortic regurgitation (AR) is a significant valvular heart disease.
  • Accurate quantitative assessment of AR is crucial for patient management.
  • Noninvasive imaging techniques are preferred for AR evaluation.

Purpose of the Study:

  • To quantitatively measure aortic regurgitation (AR) using magnetic resonance (MR) imaging velocity mapping.
  • To assess the reproducibility and accuracy of MR imaging for AR quantification.

Main Methods:

  • Cine transverse images of the ascending aorta were acquired using a 1.5-T MR imager with velocity mapping.
  • Aortic flow was calculated by integrating area and mean velocity over the cardiac cycle.
  • Regurgitant fraction (RF) was determined from antegrade and regurgitant flow measurements.

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Main Results:

  • Inter- and intraobserver variability for RF measurement was low (r = .956 and r = .998, respectively).
  • MR imaging-derived RF showed good agreement with Doppler echocardiography and aortography.
  • The method allowed for reproducible, quantitative, and noninvasive measurement of AR.

Conclusions:

  • MR imaging velocity mapping is a reliable and accurate tool for the quantitative assessment of aortic regurgitation.
  • This noninvasive technique provides reproducible measurements, aiding in clinical decision-making for AR patients.