An ultrasonic imaging device that detects, during ultrasonic imaging, periodic shape changes in living tissue and, from that change information, precisely measures speed information about fluid flowing inside the living tissue as well as pressure fluctuation and absolute pressure inside the living tissue. A signal processing unit in an ultrasonic diagnostic device comprises: an elliptical shape detection unit that detects detection data about elliptical shapes included in an inspection target and an elliptical shape arithmetic calculation unit that performs arithmetic calculations on the basis of the elliptical shapes. The elliptical shape detection unit: analyzes the elliptical shapes on the basis of chronological imaging data extracted as an elliptical shape of the living tissue, e.g., by capturing the diagonal cross section of a blood vessel and calculates temporal changes in the long axis and short axis thereof, temporal changes in the aspect ratio, or temporal changes in the blood vessel cross sectional area, etc. The elliptical shape arithmetic calculation unit: uses these elliptical shape temporal changes or, if necessary, correction information from outside calculates the speed of pulse waves propagated through the blood vessels, arterial pressure changes, and arterial pressure and displays these as further processed diagnosis information, on a display unit.La présente invention se rapporte à un dispositif dimagerie acoustique qui détecte, pendant une imagerie acoustique, des changements de forme périodiques dans un tissu vivant et, à partir des informations de changement, mesure précisément les informations de débit concernant le fluide qui circule à lintérieur du tissu vivant ainsi quune fluctuation de pression et une pression absolue dans le tissu vivant. Une unité de traitement de signal dans un dispositif de diagnostic par ultrasons comprend : une unité de détection de forme elliptique qui détecte des données de détection concernant des formes elliptiqu
