Performing receive-focusing based on mid-point algorithm in ultrasound system
There are provided embodiments for changing initial values of a mid-point algorithm to calculate a constant delay value throughout depths based on a sample volume and performing a receive-focusing based on the constant delay value. In one embodiment, an ultrasound system comprises: an ultrasound data acquisition unit configured to calculate a constant delay value throughout depths based on a sample volume by using a mid-point algorithm, transmit ultrasound signals to a living body, receive ultrasound echo signals from the living body and form digital signals based on the ultrasound echo signals, the ultrasound data acquisition unit being further configured to apply the constant delay value to the digital signals to acquire ultrasound data corresponding to a high pulse rate frequency Doppler image of the sample volume.
1. An ultrasound system, comprising:
an input interface configured to receive, from a user, a user input of setting a sample volume and a pulse rate frequency (PRF) on an ultrasound image;
an ultrasound probe configured to transmit ultrasound signals to a living body based on the PRF, and receive ultrasound echo signals from the living body; and
a controller configured to determine a constant delay value based on position of the sample volume by using a mid-point algorithm, form digital signals based on the ultrasound echo signals, focus the digital signals based on the constant delay value throughout depths, and form a high pulse rate frequency Doppler image of the sample volume based on the focused digital signals,
wherein a round trip time of the ultrasound signals to the sample volume is larger than a pulse repetition period corresponding to the PRF.
2. The ultrasound system of claim 1 , wherein the controller is further configured to:
determine the constant delay value corresponding to each of a plurality of transducer elements of the ultrasound probe based on a receiving focusing delay curve which is calculated based on the mid-point algorithm.
3. A method of forming a high pulse rate frequency Doppler image, comprising:
a) receiving a user input of setting a sample volume and a pulse rate frequency (PRF) on an ultrasound image;
b) transmitting ultrasound signals to a living body based on the PRF, and receiving ultrasound echo signals from the living body;
c) determining a constant delay value based on position of the sample volume by using a mid-point algorithm;
d) forming digital signals based on the ultrasound echo signals and focusing the digital signals based on the constant delay value throughout depths; and
e) forming a high pulse rate frequency Doppler image of the sample volume based on the focused digital signals,
wherein a round trip time of the ultrasound signals to the sample volume is larger than a pulse repetition period corresponding to the PRF.
4. The method of claim 3 , wherein the step c) comprises:
determining the constant delay value corresponding to each of a plurality of transducer elements of the ultrasound probe based on a receiving focusing delay curve which is calculated based on the mid-point algorithm.