Ultrasound diagnostic apparatus
An ultrasound diagnostic apparatus includes a transmission unit, a reception unit, and an information processing unit. The transmission unit transmits an ultrasonic wave to a subject via an ultrasound probe. The reception unit receives the ultrasonic wave reflected by the subject via the ultrasound probe. The information processing unit executes processing on a reception signal output from the reception unit. The information processing unit generates Doppler waveform data based on the reception signal, obtains a maximum value, a minimum value, and a reference value of a Doppler waveform line obtained from the Doppler waveform data, and decides a display range of blood flow velocity indicated by a Doppler waveform based on the maximum value, the minimum value, the reference value.
1 . An ultrasound diagnostic apparatus comprising:
a transmission unit that transmits an ultrasonic wave to a subject via an ultrasound probe;
a reception unit that receives the ultrasonic wave reflected by the subject via the ultrasound probe; and
an information processing unit that executes processing on a reception signal output from the reception unit,
wherein the information processing unit
generates Doppler waveform data based on the reception signal,
obtains a maximum value, a minimum value, and a reference value of a Doppler waveform line obtained from the Doppler waveform data,
decides a display range of blood flow velocity indicated by a Doppler waveform based on the maximum value, the minimum value, the reference value, and
decides the display range by multiplying a larger value of an absolute value of a value obtained by subtracting the reference value from the maximum value and an absolute value of a value obtained by subtracting the reference value from the minimum value by a predetermined scale factor, and
wherein the predetermined scale factor is decided according to an index value obtained by dividing an absolute value of a value obtained by subtracting the minimum value from the maximum value by a larger value of an absolute value of the maximum value and an absolute value of the minimum value.
2 . An ultrasound diagnostic apparatus comprising:
a transmission unit that transmits an ultrasonic wave to a subject via an ultrasound probe;
a reception unit that receives the ultrasonic wave reflected by the subject via the ultrasound probe; and
an information processing unit that executes processing on a reception signal output from the reception unit,
wherein the information processing unit
generates Doppler waveform data based on the reception signal,
obtains a maximum value, a minimum value, and a reference value of a Doppler waveform line obtained from the Doppler waveform data,
decides a display range of blood flow velocity indicated by a Doppler waveform based on the maximum value, the minimum value, the reference value, and
decides the display range by multiplying a larger value of an absolute value of a value obtained by subtracting the reference value from the maximum value and an absolute value of a value obtained by subtracting the reference value from the minimum value by a predetermined scale factor,
wherein the information processing unit calculates the predetermined scale factor according to values of a scale function for obtaining the predetermined scale factor using an index value, the scale function indicating a curve passing through a plurality of set points or a curve approximated to the curve passing through the plurality of set points,
the index value is a value indicating a difference between the maximum value and the minimum value, and
one of the plurality of set points is a point on a coordinate plane in which the index value and the predetermined scale factor are associated with each other.
3 . The ultrasound diagnostic apparatus according to claim 2 ,
wherein the information processing unit sets the set point via a user interface.