Patent ID: 9474504
Filing Date: 2016-10-25
CPC Classification: A61B

Claim Text:
1. A method of obtaining a Doppler image of tissue, which is captured using an ultrasonic wave, the method comprising: transmitting an ultrasonic signal to a target object such that two ensembles are formed; receiving an ultrasonic response signal from the target object; filtering the received ultrasonic response signal by using a variable filter; obtaining data about a filtered phase of the received ultrasonic response signal; correcting the data about a filtered phase by using a value on a frequency phase response curve of the variable filter corresponding to the data about a filtered phase; estimating a frequency of the received ultrasonic response signal based on the corrected data about a filtered phase; and generating the Doppler image of the tissue based on the estimated frequency, wherein the variable filter variably decreases an amplitude of a direct current (DC) component from the received ultrasonic response signal.