ULTRASONIC DIAGNOSTIC APPARATUS, METHOD, AND PROGRAM
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.
1 . An ultrasonic diagnostic apparatus comprising:
a computing device configured to
generate a Doppler waveform based on a signal obtained by transmitting and receiving an ultrasonic wave;
apply a second-order differentiation process to the generated Doppler waveform;
identify a plurality of peak detection periods that have a polarity corresponding to a curve of a detection target peak, the polarity being of a second-order differential value obtained by the second-order differentiation process;
obtain, for each of the plurality of 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 identified peak detection period; and
detect a peak in the Doppler waveform based on the peak scale corresponding to each of the plurality of peak detection periods.
2 . The ultrasonic diagnostic apparatus according to claim 1 , wherein
the peak scale is larger for a longer duration of the peak detection period or a larger peak value of the Doppler waveform.
3 . The ultrasonic diagnostic apparatus according to claim 1 , wherein
the peak scale is a value based on a time integrated value of the Doppler waveform in the peak detection period.
4 . The ultrasonic diagnostic apparatus according to claim 2 , wherein
the peak scale is a value based on a time integrated value of the Doppler waveform in the peak detection period.
5 . The ultrasonic diagnostic apparatus according to claim 1 , wherein
regarding a Doppler waveform for a single heartbeat, the computing device detects, of two of the peak detection periods that have top two peak scales, a peak of the Doppler waveform in a peak detection period in an earlier time phase as a peak of an E wave, whereas the computing device detects a peak of the Doppler waveform in the other peak detection period in a later time phase as a peak of an A wave.
6 . The ultrasonic diagnostic apparatus according to claim 2 , wherein
regarding a Doppler waveform for a single heartbeat, the computing device detects, of two of the peak detection periods that have top two peak scales, a peak of the Doppler waveform in a peak detection period in an earlier time phase as a peak of an E wave, whereas the computing device detects a peak of the Doppler waveform in the other peak detection period in a later time phase as a peak of an A wave.
7 . The ultrasonic diagnostic apparatus according to claim 3 , wherein
regarding a Doppler waveform for a single heartbeat, the computing device detects, of two of the peak detection periods that have top two peak scales, a peak of the Doppler waveform in a peak detection period in an earlier time phase as a peak of an E wave, whereas the computing device detects a peak of the Doppler waveform in the other peak detection period in a later time phase as a peak of an A wave.
8 . The ultrasonic diagnostic apparatus according to claim 4 , wherein
regarding a Doppler waveform for a single heartbeat, the computing device detects, of two of the peak detection periods that have top two peak scales, a peak of the Doppler waveform in a peak detection period in an earlier time phase as a peak of an E wave, whereas the computing device detects a peak of the Doppler waveform in the other peak detection period in a later time phase as a peak of an A wave.
9 . An ultrasonic diagnostic method comprising:
generating a Doppler waveform based on a signal obtained by transmitting and receiving an ultrasonic wave;
applying a second-order differentiation process to the generated Doppler waveform;
identifying a plurality of peak detection periods that have a polarity corresponding to a curve of a detection target peak, the polarity being of a second-order differential value obtained by the second-order differentiation process,
obtaining, for each of the plurality of 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
detecting a peak in the Doppler waveform based on the peak scale corresponding to each of the plurality of peak detection periods.
10 . An ultrasonic diagnostic program to be executed by a computing device of an ultrasonic diagnostic apparatus, the ultrasonic diagnostic program causing the computing device to:
generate a Doppler waveform based on a signal obtained by transmitting and receiving an ultrasonic wave;
apply a second-order differentiation process to the generated Doppler waveform;
identify a plural of peak detection periods that have a polarity corresponding to a curve of a detection target peak, the polarity being of a second-order differential value obtained by the second-order differentiation process;
obtain, for each of the plurality of 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
detect a peak in the Doppler waveform based on the peak scale corresponding to each of the plurality of peak detection periods.