Pulse wave velocity (PWV) is widely used for estimating the stiffness of an artery. It is well known that a stiffened artery can be associated with various diseases and with aging. Usually, PWV is measured using the “foot-to-foot” method in which the travel time of the blood pressure wave is measured over a distance. The “foot” of the pressure wave is not clear due to reflected waves. Also, PWV is an average indicator of artery stiffness between the two measuring points, and therefore does not identify local stiffness. The authors have developed a wave method in which the localized ultrasound...