An objective of the present invention is to derive a veracity of circulatory speed information which is estimated in a circulatory flow mapping display. An ultrasound image capture device signal processing unit comprises a Doppler velocity computation unit which computes a Doppler speed using a Doppler effect from an echo signal, and a first circulatory speed computation unit which creates a tissue cross-section image from the echo signal, and, based on this tissue cross-section image, computes a circulatory speed at a prescribed site from the movement of the tissue. The ultrasound image capture device signal processing unit further comprises a second circulatory speed computation unit which computes the circulatory speed at the prescribed site using the Doppler speed which the Doppler speed which the Doppler speed computation unit has computed. The ultrasound image capture device signal processing unit computes a degree of matching between the circulatory speed which the first speed computation unit has computed and the circulatory speed which the second speed computation unit has computed for the prescribed site, derives a veracity/reliability of the circulatory speed information from the degree of matching, and displays same.La présente invention concerne la véracité des informations de vitesse circulatoire qui sont estimées dans un dispositif d'affichage de mappage de débit circulatoire. Une unité de traitement de signal de dispositif de capture d'image ultrasonore comporte une unité de calcul de vitesse Doppler, qui calcule une vitesse Doppler à l'aide d'un effet Doppler d'un signal d'écho, et une première unité de calcul de vitesse circulatoire, qui crée une image de section transversale d'un tissu à partir du signal d'écho, et, sur la base de cette image de section transversale du tissu, qui calcule une vitesse circulatoire au niveau d'un site prescrit à partir du déplacement du tissu. L'unité de traitement de signal de dispositif de capture d'image ultrasono
