Patent ID: 8366624

Claim:
A method comprising: acquiring color Doppler data associated with a pulse repetition frequency (f PRF ) and a baseline shift; detecting a first area of the color Doppler data representing zero flow velocity; detecting a second area of the color Doppler data adjacent to the first area and representing non-zero flow velocities in a first direction; detecting a first transition between one or more velocities of the second area corresponding to Doppler shift frequencies greater than f PRF 2 minus a first positive preset value minus the baseline shift if the first direction is positive or plus the baseline shift if the first direction is negative and one or more velocities of an adjacent third area of the color Doppler data in a second direction substantially opposite to the first direction and corresponding to Doppler shift frequencies greater than f PRF 2 minus a second positive preset value plus the baseline shift if the second direction is negative or minus the baseline shift if the second direction is positive; detecting a second transition between the third data and an adjacent fourth area of the color Doppler data representing non-zero flow velocities in the first direction; subtracting a velocity corresponding to f PRF from each of the flow velocities of the third area if the second direction is positive; and adding the velocity corresponding to f PRF to each of the flow velocities of the third area if the second direction is negative.