Methods and systems for pulse scanning and simultaneously displaying a blood flow image and a B-mode image

1. A pulse scanning method, the method comprising:

scanning a plurality of scan groups within an interleave-scan packet, wherein scanning each scan group of the plurality of scan groups comprises,

scanning a plurality of color blood flow image scan lines, wherein the plurality of color blood flow image scan lines comprise all color blood flow image scan lines for forming a frame of color blood flow image, and

scanning at least one B-mode scan line for a B-mode image,

wherein scanning each scan group of the plurality of scan groups is performed within a pulse repetition period of the color blood flow image scanning,

wherein the plurality of scan groups within the interleave-scan packet together comprises all B-mode scan lines for forming a frame of B-mode image,

wherein the method further comprising calculating the pulse repetition period using a formula:

t=C /(4 f*S ),

wherein t is the pulse repetition period, C is a speed of sound, f is current transmission frequency, and S is a maximal value of a speed test range selected by a user.

2. The pulse scanning method according to claim 1 , wherein:

scanning each scan line of the plurality of color blood flow image scan lines comprises a duration of at least time T 1 , which satisfies T 1 =(2*D/C), wherein D is a remote end depth of a color blood flow image sampling window, and C is the speed of sound; and

scanning each scan line of the B-mode scan lines comprises a duration of at least time T 2 , which satisfies T 2 =(2*d/C), wherein d is a maximal depth of the B-mode image, and C is the speed of sound.

3. The pulse scanning method according to claim 2 , further comprising calculating a number M of the B-mode scan lines in each of the scan groups using a formula:

M =floor[( t−N*T 1)/ T 2],

wherein M is the number of the B-mode scan lines, t is the pulse repetition period, N is the times of the repetition scan of the color blood flow image scan lines in one scan group, T 1 is the minimum time required for completing each color blood flow image scanning, T 2 is the minimum time required for completing each B-mode scan, and floor is a round-down function.

4. The pulse scanning method according to claim 3 , wherein scanning the plurality of scan groups comprises scanning the plurality of scan groups such that a time interval between a color blood flow image scan line followed by a color blood flow image scan line is CTx, a time interval between a color blood flow image scan line followed by a B-mode scan line is CTx, a time interval between a B-mode scan line followed by a B-mode scan line is BTx, and a time interval between a B-mode scan line followed by color blood flow image scan line is BTx, wherein

CTx=T 1; and

BTx =[( t−N*CTx )/ M].