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Evaluation of reference systems for quantitative wall motion analysis from three-dimensional endocardial surface

K Bjørnstad1, J Maehle, S Aakhus

  • 1Department of Medicine, University Hospital of Trondheim, Norway.

American Journal of Cardiac Imaging
|October 1, 1996
PubMed

Insights

Computerized 3D analysis of left ventricular wall motion was compared to visual assessment. A reference system based on wall motion toward the major ventricular axis showed the best agreement for abnormality localization.

Area of Science:

  • Cardiology
  • Medical Imaging
  • Computational Biology

Background:

  • Assessing left ventricular (LV) wall motion is crucial for diagnosing cardiac conditions.
  • Traditional visual analysis of 2D echocardiograms has limitations in quantitative accuracy.
  • Three-dimensional (3D) quantitative assessment offers a more comprehensive approach to LV function evaluation.

Purpose of the Study:

  • To compare the accuracy of six computer-implemented reference systems for 3D quantitative assessment of LV wall motion abnormalities.
  • To evaluate the concordance between 3D computerized methods and standard 2D visual analysis.
  • To identify the optimal reference system for accurate LV wall motion abnormality assessment.

Main Methods:

  • Endocardial borders were traced in three apical echocardiographic views at end-diastole and end-systole.
  • 3D reconstruction of endocardial surfaces was performed for 10 myocardial infarction patients and 5 healthy subjects.
  • Systolic wall motion was assessed at 1,024 points using six different reference systems, with results displayed in bull's-eye maps.

Main Results:

  • The best agreement between 3D computerized and visual analysis for localizing abnormal wall motion was achieved using a reference system based on wall motion towards the major ventricular axis.
  • The poorest agreement was observed when using the center of the left ventricular cavity as the reference.
  • The highest correlation (r = .92) between the estimated area of wall motion abnormality and the visual wall motion score index was obtained using the aligned center of the mitral valve plane as the reference.

Conclusions:

  • The choice of reference system significantly impacts the accuracy of 3D computerized LV wall motion analysis.
  • A reference system aligned with the major ventricular axis or mitral valve plane offers superior performance compared to cavity-centered references.
  • These findings support the development of more accurate and reliable quantitative tools for echocardiographic assessment of cardiac function.

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