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eBook details

• Title: Ultrasonic Methods for Measurement of Small Motion and Deformation of Biological Tissues for Assessment of Viscoelasticity
• Author : Hideyuki Hasegawa & Hiroshi Kanai
• Release Date : January 15, 2014
• Genre: Engineering,Books,Professional & Technical,
• Pages : * pages
• Size : 6318 KB

Description

In this monograph, an accurate ultrasonic method for measurement of

small motion and deformation of biological tissue is described. In the

displacement estimation based on the phase change of echoes, the displacement

estimates are biased when the center frequency of the RF echo

changes. Such an apparent change in the center frequency could be caused

by the interference of echoes from scatterers. To reduce the influence of

the center frequency variation on the estimation of motion and deformation,

an error correcting function, which does not require the assumption

that the center frequency distributions in 2 different frames are the same,

was introduced. As a result, the proposed method provides better strain

estimates in comparison with conventional phase-sensitive correlation

methods.

This monograph also shows examples of applications of this method to

measurement of small motion and deformation of biological tissues. This

method can be applied to measurement of elasticity of dynamic tissues,

such as the artery. Also, elastic properties of static tissues can be also measured

by combining with actuation using the acoustic radiation force.

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