Patent ID: 9700285
Date: 2017-07-11
CPC Classifications: A61B,G01S,G06T

Claim:
1. A method for spectral Doppler imaging, the method comprising: transmitting, from a transducer, ultrasound energy to a Doppler gate location at a set or higher pulse repetition frequency allowable by roundtrip travel of the ultrasound energy between the transducer and the Doppler gate location; storing responses to the transmitting over time; calculating a first velocity scale from at least one of the responses to the transmitting, the first velocity scale less than or equal to the pulse repetition frequency; estimating from the responses, first spectra over time for the Doppler gate location, the estimating using the first velocity scale; displaying a first image of the first spectra with the first velocity scale, the first image representing a first range of times; later calculating a second velocity scale from at least another one of the responses to the transmitting, the second velocity scale different from the first velocity scale; estimating from the responses, second spectra over time for the Doppler gate location, the estimating of the second spectra using the second velocity scale; and displaying second image of the second spectra with the second velocity scale, the second spectra including spectra from times within the first range of times also represented in the first image.