Patent ID: 6530890
Filing Date: 2003-03-11
Classification: A61B,G01S

Abstract:
An ultrasound diagnostic apparatus for measuring a blood flow velocity, the apparatus comprising:means for generating sample data by transmitting an ultrasound signal into a human body and sampling a reflected signal of the ultrasound signal; means for generating frequency distribution data by processing the sample data, wherein the frequency distribution data includes a number of frequency components, each of the frequency components having a corresponding power level; first determining means for selecting one of a positive frequency range and a negative frequency range of the frequency distribution data; second determining means for determining a noise threshold by using a predetermined number of frequency components within the frequency range selected by the first determining means; and third determining means for determining a peak frequency component having a highest frequency among the frequency components, each having a power level higher than the noise threshold and the peak frequency component corresponding to the peak blood flow velocity; wherein the first determining means determines the frequency range selected by the first determining means by selecting a frequency range having the largest sum of power levels of the frequency components between the positive frequency range and the negative frequency range.