Vascular intramural strain imaging using arterial pressure equalization

Ultrasound in Medicine & Biology
Kang KimM O'Donnell

Abstract

Peripheral vascular strain imaging has limited strain dynamic range because arterial wall deformations only exhibit small strains under physiologic pressures. A noninvasive freehand ultrasound (US) scanning procedure was performed to apply external force, comparable to the force generated in measuring a subject's blood pressure, to achieve higher strains by equalizing the internal arterial baseline pressure. When the applied pressure matched the internal baseline diastolic pressure, intramural strain and strain rate increased by a factor of 10 over a cardiac cycle. Radial arterial strain was assessed within the vessel wall over the entire deformation procedure using a phase-sensitive 2-D speckle-tracking algorithm. The feasibility of this technique to assess vascular nonlinear elastic properties is demonstrated in an ex vivo experiment and further supported by in vivo measurements. With some uncertainty associated with the elastic properties of surrounding tissue, an elastic modulus reconstruction procedure was developed to estimate the nonlinear elastic properties of the vascular wall.

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Citations

Sep 21, 2013·Computerized Medical Imaging and Graphics : the Official Journal of the Computerized Medical Imaging Society·Elizabeth MercureGuy Cloutier
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Nov 7, 2008·IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control·Hideyuki Hasegawa, Hiroshi Kanai
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