Vascular elastography: a validation study.

Area of Science:

• Biomedical Engineering
• Medical Imaging
• Cardiovascular Research

Background:

• Vascular elastography offers promising methods for characterizing diseased artery mechanics.
• Current validation relies on simulations, phantoms, histology, or other imaging.
• Direct mechanical testing provides a gold standard for validation.

Purpose of the Study:

• To validate vascular elastography by comparing its results with standard bi-axial tensile testing.
• To assess the mechanical properties of porcine aortas using ultrasound elastography.
• To evaluate the correspondence between ultrasound elastography and tensile testing in vitro.

Main Methods:

• In vitro inflation testing of 10 porcine aortas.
• Application of vascular elastography (ultrasound) and bi-axial tensile testing.
• Fitting a neo-Hookean material model to stress-strain data for large deformations.

Main Results:

• Good correspondence was found between ultrasound elastography (GUS = 110 ± 11 kPa) and tensile testing (GTT = 108 ± 10 kPa).
• Bland-Altman analysis showed minimal bias between the two methods (GUS-GTT = 2 ± 20 kPa).
• The neo-Hookean model effectively described the large deformations of the aortic tissue.

Conclusions:

• Vascular elastography demonstrates high accuracy and reliability for mechanical characterization of arteries.
• The findings support the use of ultrasound elastography as a viable alternative to tensile testing for in vitro arterial analysis.
• Future work will focus on non-linear material models for in vivo applications.