Abstract: To correctly trace a target component even when a folded component is included in a Doppler waveform. The Doppler waveform is configured by a plurality of luminance distributions 54 arranged on a time axis. In each luminance distribution 54, a minimum luminance value located in the trough portion 54c between the target portion 54a and the folded portion 54b is specified. A search start point Pn is set based on the minimum luminance value. A trace point 60 is specified by searching from the search start point Pn to a base line 61 side.

Abstract: A computing device generates a Doppler waveform based on a signal obtained by transmitting and receiving an ultrasonic wave; applies a second-order differentiation process to the generated Doppler waveform; and identifies peak detection periods that have a polarity corresponding to a curve of a detection target peak. The polarity is of a second-order differential value obtained by the second-order differentiation process. The computing device further obtains, for each of the multiple identified peak detection periods, a peak scale based on a duration of the peak detection period and a peak value of the Doppler waveform in the peak detection period, and detects a peak in the Doppler waveform based on the peak scale corresponding to each of the multiple peak detection periods.

Abstract: To correctly trace a target component even when a folded component is included in a Doppler waveform. The Doppler waveform is configured by a plurality of luminance distributions 54 arranged on a time axis. In each luminance distribution 54, a minimum luminance value located in the trough portion 54c between the target portion 54a and the folded portion 54b is specified. A search start point Pn is set based on the minimum luminance value. A trace point 60 is specified by searching from the search start point Pn to a base line 61 side.