longitudinal strain การใช้

• It has been shown clinically that longitudinal strain rate and wall thickening are diagnostically equivalent.
• This ensures that the longitudinal strain, except near bridges where an expansion joint is sometimes used.
• The strain pulse forms a pancake-like region of longitudinal strain that propagates directly into the solid away from the surface.
• The fiber strain ( ?f ) experienced by the longitudinal red muscle fibers is equivalent to the longitudinal strain ( ?x ).
• This phenomenon results in an architectural gear ratio, determined as longitudinal strain divided by fiber strain ( ?x / ?f ), greater than one and longitudinal velocity amplification; furthermore, this emergent velocity amplification may be augmented by variable architectural gearing via mesolateral and dorsoventral shape changes, a pattern seen in pennate muscle contractions.
• Due to this, and the fact that the left ventricle in normal conditions contract with a relatively invariant outer contour, the longitudinal strain contains the main information, while transmural strain ( wall thickening ) is a function of wall shortening, wall thickness and chamber diameter, while circumferential shortening is mainly a function of wall thickening.