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Mathematical three-dimensional solid modeling of biventricular geometry

J S Pirolo¹, S J Bresina, L L Creswell

¹Department of Surgery, Washington University, St. Louis, MO.

Annals of Biomedical Engineering

|May 1, 1993

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Advanced computer-aided design and engineering (CAD/CAE) created accurate 3-D solid models of biventricular geometry. This method improves the characterization of regional myocardial stress distribution for better cardiac analysis.

Area of Science:

Biomedical Engineering
Cardiovascular Mechanics
Computational Anatomy

Background:

Characterizing regional myocardial stress distribution is limited by simplified mathematical models of heart geometry.
Advanced computer-aided design and engineering (CAD/CAE) offer precise geometric modeling capabilities.

Purpose of the Study:

To create an accurate 3-D solid model of the biventricular unit using CAD/CAE techniques.
To assess the accuracy of the solid model for representing myocardial geometry.
To evaluate the suitability of the model for finite element analysis.

Main Methods:

Utilized advanced CAD/CAE software to construct a 3-D solid model from planar geometric data of an ex vivo canine heart.
Performed volumetric analysis to determine global volume errors.

Related Experiment Videos

Calculated in-plane area and circumference errors.

Main Results:

Achieved low global volume errors for ventricular cavities, myocardial wall, and total enclosed volumes (ranging from -1.1% to 4.7%).
In-plane area and circumference determinations showed acceptable errors (5.3 +/- 6.7% and 3.8 +/- 2.7%, respectively).
Operator variability was identified as a potential source of model volume errors.

Conclusions:

Solid modeling using CAD/CAE provides an accurate mathematical representation of biventricular geometry.
The developed solid model is suitable for meshing and finite element analysis.
This approach can enhance the characterization of regional myocardial stress distribution.