Doppler Signal Processing For An Enhanced Spectral Doppler Image
Embodiment for processing Doppler signals for an enhanced spectral Doppler image in an ultrasound system is disclosed. The Doppler signals, which are obtained by transmitting/receiving an ultrasound signal to/from a target object, are window-processed with a plurality of windows, each of the windows having different sizes. The window-processed Doppler signals are transformed into a plurality of frequency-domain Doppler signals. The transformed Doppler signals are compounded and then a spectral Doppler image is formed based on the compound Doppler signals.
1 . An ultrasound system, comprising:
a Doppler signal acquisition unit for transmitting an ultrasound transmit beam into a target object and receiving echo signals reflected from the target object to form Doppler signals;
a signal processing unit for performing window-processing upon the Doppler signals with a plurality of windows, each of the windows having different sizes, to output a plurality of window-processed Doppler signals and transform the plurality of window-processed Doppler signals into a plurality of frequency-domain Doppler signals, the signal processing unit being further configured to compound the transformed Doppler signals to output compound Doppler signals; and
an image processing unit for forming a Spectral Doppler image based on the compound Doppler signals.
2 . The ultrasound system of claim 1 , further comprising:
a storage unit for storing a mapping table mapping a plurality of pulse repetition frequencies to a plurality of reference window sizes;
a user input unit for allowing a user to input window setting information for setting the plurality of windows; and
a control unit for controlling the transmission of the ultrasound transmit beam at one of the pulse repetition frequencies, the control unit being further configured to extract a reference window size corresponding to the pulse repetition frequency used to transmit the ultrasound transmit beam from the mapping table stored in the storage unit and set the plurality of windows based on the window setting information and the extracted reference window size.
3 . The ultrasound system of claim 2 , wherein the signal processing unit is further configured to compress the compound Doppler signals.
4 . The ultrasound system of claim 2 , wherein the user input is further configured to allow the user input compound setting information for setting different weights to be applied to the transformed Doppler signals.
5 . The ultrasound system of claim 4 , wherein the signal processing section is further configured to apply the weights to the transformed Doppler signals to output weighted Doppler signals and compound the weighted Doppler signals.