Ultrasound system and method for forming BC-mode image

1. An ultrasound system, comprising:

a control unit configured to generate a first control signal for a B-mode scan and a second control signal for a C-mode scan:

a transmit/receive unit responsive to the first and second control signals and being configured to transmit ultrasound signals along a plurality of predetermined number of scan lines set in a target object and form receive signals based on the ultrasound echo signals reflected from the target object, said receive signals including first receive signals formed in response to the first control signal and second receive signals formed in response to the second control signal;

a storage unit configured to store the first and second receive signals;

and an image processing unit configured to form a B-mode image and a C-mode image based on the first and second receive signals stored in the storage unit and to combine the B-mode image with the C-mode image to form a BC-mode image,

wherein the control unit is configured to divide the scan lines into a plurality of scan line groups where the B-mode scan line groups are determined by the equation of T B =N B /PRF B and C-mode scan lines groups are determined by the equation of T c =(N c ×P s )/PRF c and generate a third control signal for alternately selecting one of the scan line groups for a B-mode scan along scan lines of the selected scan line group based on a time ratio, the control unit being further configured to repeatedly generate the second and third control signals,

wherein the receive signals include scan line group receive signals formed through the B-mode scan along scan lines of the selected scan line group in response to the third control signal and new second receive signals formed in response to the second control signal, and wherein the image processing unit is configured to update the first receive signals with the scan line group receive signals, and form a new B-mode image based on the updated first receive signals and a new C-mode image based on the new second receive signals and combine the new B-mode image with the new C-mode image to form a new BC-mode image.

2. The ultrasound system of claim 1 , further comprising an input unit configured to receive a user input for setting a color box on the B-mode image, wherein the C-mode scan is carried out along scan lines within the color box.

3. The ultrasound system of claim 2 , wherein the control unit includes:

a time computing unit configured to compute a first time duration required to form the B-mode image and a second time duration required to form the C-mode image;

a scan line group setting unit configured to divide the first time duration by the second time duration and divide the scan lines into the plurality of scan line groups based on the division result, wherein each of the scan line groups include different scan lines; and

a control signal generating unit for generating the control signal.

4. The ultrasound system of claim 1 , wherein the storage unit is configured to store the updated first receive signals.

5. A method of forming a BC-mode image, comprising:

a) generating a first control signal for a B-mode scan and a second control signal for a C- mode scan:

b) transmitting ultrasound signals along a plurality of predetermined number of scan lines set in a target object and form first receive signals and second receive signals based on the ultrasound echo signals reflected from the target object in response to the first and second control signals, respectively;

c) forming a B-mode image and a C-mode image based on the first and second receive signals, respectively, and combining the B-mode image with the C-mode image to form a BC-mode image;

d) dividing the scan lines into a plurality of scan line groups based on a first time duration required to form the B-mode image based on equation of T B =N B /PRF B and a second time duration required to form the C-mode image based on equation of T c =(N c ×P s )/PRF c ;

e) generating a third control signal for alternately selecting one of the scan line groups for a B-mode scan along scan lines of the selected scan line group to form scan line group receive signals;

f) updating the first receive signals with the scan line group receive signals formed through the B-mode scan along scan lines of the selected scan line group in response to the third control signal;

g) forming a new B-mode image based on the updated first receive signals; h) generating the second control signal to thereby form a new C-mode image and combining the new B-mode image with the new C-mode image to form a new BC-mode image; and

i) repeating steps e) to h).

6. The method of claim 5 , further comprising receiving a user input for setting a color box on the B-mode image, wherein the C-mode scan is carried out along scan lines within the color box.

7. The method of claim 6 , wherein the step d) includes:

dividing the first time duration by the second time; and

dividing the scan lines into the plurality of scan line groups based on the division result,

wherein each of the scan line groups include different scan lines.

8. The method of claim 5 , further comprising the first receive signals, the second receive signals and the updated first receive signals.