Patent ID: 8303507

Claim:
An ultrasonic Doppler diagnostic apparatus comprising: a Doppler signal detecting unit which detects a Doppler signal at a predetermined region from a reception signal obtained by performing ultrasonic wave transmission/reception with respect to an object to be examined; a spectrum calculating unit which calculates a frequency spectrum of the Doppler signal; a trace waveform generating unit which generates a trace waveform representing a temporal change in a predetermined spectrum component in the frequency spectrum; a processing unit which generates data by extracting a trace waveform for each cardiac cycle from the generated trace waveform, and arraying said plurality of extracted trace waveforms along a first time axis representing a time direction associated with a heart rate and a second time axis representing a time direction within one cardiac cycle; a statistical processing unit which generates a diagnostic waveform by performing statistical processing using the data; a storage unit which stores a selection criterion; a feature amount selecting unit which automatically selects a feature amount for the diagnostic waveform on the basis of the stored selection criterion; a diagnostic parameter measuring unit which measures a diagnostic parameter on the basis of the feature amount; and a display unit which displays a measurement result on the diagnostic parameter; wherein the feature amount comprises an E wave and A wave of the trace waveform which are obtained in left ventricular blood inflow measurement; and wherein the diagnostic parameter measuring unit measures at least one of an amplitude ratio E/A between E and A waves of a trace waveform of a maximum flow velocity and a lower limit period DCT of an E wave as the diagnostic parameter on the basis of the feature amount selected by the feature amount selecting unit.