CN103519840A - Multi-beam pulse inversion imaging method and system - Google Patents
Multi-beam pulse inversion imaging method and system Download PDFInfo
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- CN103519840A CN103519840A CN201210231622.6A CN201210231622A CN103519840A CN 103519840 A CN103519840 A CN 103519840A CN 201210231622 A CN201210231622 A CN 201210231622A CN 103519840 A CN103519840 A CN 103519840A
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Abstract
The invention discloses a multi-beam pulse inversion imaging method and a multi-beam pulse inversion imaging system. The method comprises the following steps: step S1, the emitter divides the emitted scanning lines into odd and even groups, and controls the emitting lines of one group to emit positive polarity or negative polarity pulse, and the other group to emit reversed phase pulse; in step S2, after receiving the reception beams corresponding to the scan lines transmitted in step S1, the receiver performs summation processing on the actual reception beams corresponding to the desired reception beams that are overlapped in spatial position, thereby obtaining harmonic signals. The method and the device simultaneously achieve the purposes of beam distortion correction and harmonic signal acquisition, and reduce the complexity of echo signal processing.
Description
Technical field
The present invention relates to medical ultrasound image technical field, particularly relate to a kind of multi-beam pulse inversion formation method and system.
Background technology
Harmonic imaging, by the fundamental signal of a certain frequency of transmitting, extracts the high-order harmonic wave composition receiving in signal, finally forms harmonic image.In Harmonic imaging, system front end transmitting fundamental signal enters tissue, non-linear due to tissue, and first-harmonic, in communication process, can produce higher harmonic components, can obtain the information with tissue non linear correlation.Because the generation of harmonic wave in tissue is the result of an energy accumulation, therefore in the near field of image, harmonic component is fewer, can reduce like this pseudomorphisms such as multiple reflections that echo near field.Secondly, the sound field of harmonic imaging distributes and with respect to first-harmonic, has less secondary lobe, so the contrast of image can be better; On the other hand, harmonic imaging, with respect to first-harmonic, has shorter wavelength, and the resolution of all harmonic imagings can be higher than first-harmonic.
Traditional harmonic imaging extracts harmonic component by the echo receiving is carried out to filtering, due to the bandwidth of principal wave harmonic wave have overlapping, no matter therefore take which kind of design of filter to be all difficult to harmonic wave and first-harmonic to make a distinction.Filter bandwidht design is too wide, can introduce the composition of first-harmonic, and final image, by the harmonious wave component of first-harmonic, has reduced the advantage of harmonic image; Otherwise filter bandwidht designs too narrowly, can lose harmonic information, also can reduce the quality of harmonic image.People propose a kind of pulse inversion Harmonic imaging, contrary by priority polarity of transmission, and two pulses that amplitude is identical are added the echo successively receiving to offset the technology that fundametal compoment strengthens harmonic component, have been widely used in tissue harmonic imaging.Pulse inversion imaging technique, with respect to common tissue harmonic imaging, first-harmonic is had to stronger inhibition ability, so image has better contrast and signal to noise ratio.
Pulse inversion technique can improve the picture quality of harmonic imaging, but owing to will successively launch twice on same scanning line, therefore adopts the frame frequency of image after pulse inversion technique to reduce by half.
In order to improve the frame frequency of pulse inversion imaging, multi-beam reception technique is widely used.So-called multi-beam, is exactly that ultrasound emission once just receives synthetic multi-strip scanning line, thereby improves frame per second.By multibeam technique, guarantee to receive in the situation of line density equally, the number of times that reduces transmitting improves frame frequency.In fact, multibeam technique is subject to transmitting and the impact receiving not at same position, thereby causes the distortion of received beam to reduce picture quality.Therefore, thus the distortion that must take some compensation techniques to compensate multi-beam improves the quality of image.
The current mode of taking mostly is the method for space filtering between adjacent lines and compensates multi-beam distortion, but existing method more complicated all, and practicality is not high.And further, it can cause frame frequency further to decline under multifocal point, can reduce the harmonic image quality in far field, and distortion meeting is more serious, reduce the quality of image.
Summary of the invention
The invention provides a kind of multi-beam pulse inversion formation method and system, its frame frequency that has solved pulse inversion Harmonic imaging reduces, the problems such as multi-beam complicated operation.
The present invention also provides multi-beam pulse inversion formation method and system under a kind of multifocal point, and its frame frequency that has solved pulse inversion Harmonic imaging reduces, the problems such as multi-beam complicated operation.
The present invention more provides different beams pulse inversion formation method and system under a kind of multifocal point, and its frame frequency that has solved pulse inversion Harmonic imaging reduces, the problems such as multi-beam complicated operation.
For realizing the pulse inversion formation method of a kind of multi-beam that the object of the invention provides, comprise the steps:
Step S1, emitter is divided into two groups of odd evens by the scanning line setting of transmitting, and controls wherein line of departure transmitting positive polarity or the negative pulse of one group, another group line transmitting rp pulse;
Step S2, receptor, after received beam corresponding to the scanning line that receives step S1 transmitting, for the corresponding actual received beam of the overlapping expectation received beam in locus, sums up processing, obtains harmonic signal.
Preferably, in described step S2, also comprise the steps:
Step S2 ', receptor, for there is no the corresponding actual received beam of the overlapping expectation received beam of wave beam, carries out direct filtering, extracts harmonic component; Or described in giving up, there is no the corresponding actual received beam of the overlapping expectation received beam of wave beam.
A kind of multi-beam pulse inversion imaging system also providing for realizing the object of the invention, comprises emitter and receptor, wherein:
Described emitter comprises that first arranges module, the first control module, wherein:
Described first arranges module, for the scanning line setting of transmitting is divided into two groups of odd evens;
Described the first control module, arranges for controlling first two groups of scanning lines that module arranges, and wherein the line of departure of a group is launched positive polarity or negative pulse, another group line transmitting rp pulse;
Described receptor comprises that first adds and module, wherein:
Described first adds and module, after received beam corresponding to the scanning line receiving emitter transmitting, for the corresponding actual received beam of the overlapping expectation received beam in locus, sums up processing, obtains harmonic signal.
Preferably, described receptor also comprises that the first filtration module and first gives up module, wherein:
Described the first filtration module, for for there is no the corresponding actual received beam of the overlapping expectation received beam of wave beam, carries out direct filtering, extracts harmonic component;
Described first gives up module, for for not having the corresponding actual received beam of the overlapping expectation received beam of wave beam to give up.
The pulse inversion formation method that multi-beam under a kind of multifocal point is also provided for realizing the object of the invention, comprises the steps:
Step S10, emitter is divided into two groups of odd evens by the scanning line setting of transmitting in i transmitting focus, and controls wherein one group of transmitting positive polarity or negative pulse, another group transmitting rp pulse;
Wherein, i=2 ..., N, N is more than or equal to 2 positive integer;
Step S20, receptor receives after the received beam that the scanning line of i transmitting focus of step S10 transmitting is corresponding, for the corresponding actual received beam of the overlapping expectation received beam in locus, sum up processing, obtain the harmonic signal of i transmitting focus;
Step S30, carries out focal point mosaic to the harmonic signal obtaining in N focus, obtains final harmonic signal.
For realizing the object of the invention, also provide multi-beam pulse inversion imaging system under a kind of multifocal point, comprise emitter and receptor, wherein:
Described emitter comprises that second arranges module, the second control module, wherein:
Described second arranges module, in i transmitting focus, the scanning line setting of transmitting being divided into two groups of odd evens, and controls wherein one group of transmitting positive polarity or negative pulse, another group transmitting rp pulse;
Wherein, i=2 ..., N, N is more than or equal to 2 positive integer;
Described the second control module, arranges for controlling second two groups of scanning lines that module arranges, and wherein the line of departure of a group is launched positive polarity or negative pulse, another group line transmitting rp pulse;
Described receptor comprises that second adds and module and the first concatenation module, wherein:
Described second adds and module, after received beam corresponding to the scanning line of i transmitting focus receiving emitter transmitting, for the corresponding actual received beam of the overlapping expectation received beam in locus, sum up processing, obtain the harmonic signal of i transmitting focus;
Described the first concatenation module, for the harmonic signal obtaining in N focus is carried out to focal point mosaic, obtains final harmonic signal.
The pulse inversion formation method that different beams under a kind of multifocal point is also provided for realizing the object of the invention, comprises the steps:
Step S100, emitter carries out different wave beams for different transmitting focuses to be controlled, according to focus configuration numbers of beams;
Step S200, emitter is controlled and is taked simple beam, in the first transmitting focus transmitting positive pulse or negative pulse;
Step S300, emitter is controlled at same position transmitting rp pulse;
Step S400, receptor receives after the echo wave beam of priority twice emitting of the first transmitting focus of step S200～300 transmittings, and the first transmitting focus echo-signal that successively twice emitting produces is summed up;
Step S500, emitter configures numbers of beams M in i transmitting focus, arranges the scanning line in i transmitting focus is divided into two groups of odd evens, and control wherein one group of transmitting positive polarity or negative pulse, another group transmitting rp pulse;
Wherein, i=2 ..., N, N, M are more than or equal to 2 positive integer;
Step S600, receptor receives after the received beam that the scanning line of i transmitting focus of step S500 transmitting is corresponding, for the corresponding actual received beam of the overlapping expectation received beam in locus, sum up processing, obtain the harmonic signal of i transmitting focus;
Step S700, the harmonic signal that the first transmitting focus is added and obtained, and the harmonic signal obtaining in other N-1 focus carries out focal point mosaic, obtains final harmonic signal.
Preferably, described step S600 comprises the steps:
Step S600 ', receptor, for there is no the corresponding actual received beam of the overlapping expectation received beam of wave beam, carries out direct filtering, extracts harmonic component; Or described in giving up, there is no the corresponding actual received beam of the overlapping expectation received beam of wave beam.
Preferably, in described step S100, according to focus configuration numbers of beams, refer in the near field of emitter and be configured to simple beam, in the middle far field of emitter, be configured to dualbeam or four wave beams or more wave beam.
Preferably, described emitter carries out different wave beams to different transmitting focuses to be controlled, and according to focus configuration numbers of beams, by following engineering parameter, controls:
Focal position [pos
1pos
2pos
n]
Numbers of beams [M
1m
2m
n]
Wherein, M
1=1, M
2=2 ...
For realizing the object of the invention, also provide different beams pulse inversion imaging system under a kind of multifocal point, comprise emitter and receptor, wherein:
Described emitter comprises the first configuration module, the 3rd control module, and the 3rd adds and module, the 3rd module is set, the 4th control module, the 4th adds and module, the second concatenation module, wherein:
Described the first configuration module, carries out different wave beams for the transmitting focus for different and controls, according to focus configuration numbers of beams;
Described the 3rd control module, takes simple beam for controlling, in the first transmitting focus transmitting positive pulse or negative pulse; And be controlled at same position transmitting rp pulse;
The described the 3rd arranges module, in i transmitting focus, the scanning line setting of transmitting being divided into two groups of odd evens, and controls wherein one group of transmitting positive polarity or negative pulse, another group transmitting rp pulse;
Wherein, i=2 ..., N, N is more than or equal to 2 positive integer;
Described the 4th control module, arranges for controlling the 3rd two groups of scanning lines that module arranges, and wherein the line of departure of a group is launched positive polarity or negative pulse, another group line transmitting rp pulse;
Described receptor comprises that the 3rd adds with module, the 4th and add and module and the second concatenation module, wherein:
The described the 3rd adds and module, for receiving after the echo wave beam of priority twice emitting of the first transmitting focus of emitter transmitting, the first transmitting focus echo-signal that successively twice emitting produces is summed up;
The described the 4th adds and module, after received beam corresponding to the scanning line of i transmitting focus receiving emitter transmitting, for the corresponding actual received beam of the overlapping expectation received beam in locus, sum up processing, obtain the harmonic signal of i transmitting focus;
Described the second concatenation module, for the harmonic signal that the first transmitting focus is added and obtained, and the harmonic signal obtaining in other N-1 focus carries out focal point mosaic, obtains final harmonic signal.
The pulse inversion formation method of multi-beam of the present invention, only need be added the echo-signal successively receiving, and just can realize wave beam distortion correction simultaneously and obtain the object of harmonic signal, and reduction is for the complexity of echo signal processing; In multifocal some situation, different focuses are carried out to different received beam configurations, when guaranteeing frame frequency, can farthest reduce the quality that wave beam distortion and Operating Complexity improve pulse inversion image again.
Accompanying drawing explanation
In order to make object, technical scheme and the advantage of multi-beam pulse inversion formation method of the present invention and system clearer, below in conjunction with concrete drawings and the specific embodiments, multi-beam pulse inversion formation method of the present invention and system are further elaborated.
Fig. 1 is the schematic diagram of an embodiment of pulse inversion formation method of multi-beam of the present invention;
Fig. 2 is the schematic diagram of the pulse inversion formation method embodiment of multi-beam under the multifocal point of the present invention;
Fig. 3 is the schematic diagram of the pulse inversion formation method embodiment of different beams under the multifocal point of the present invention.
The specific embodiment
Embodiment mono-:
The multi-beam pulse inversion formation method of the embodiment of the present invention; for ease of describing; in the embodiment of the present invention; only adopted 3～4 lines of departure and described the embodiment of the present invention, but it should be noted that the present invention is not limited to this; it goes for the situation of more the lines of departure equally; wherein the application of line of departure number can have different settings, and the scope of the claims in the present invention protection is also not limited to the situation of 3～4 lines of departure, and its same protection has the situation of more the lines of departure.
The pulse inversion formation method of the embodiment of the present invention one multi-beam, as shown in Figure 1, comprises the steps:
Step S1, emitter is divided into two groups of odd evens by the scanning line setting of transmitting, and controls wherein line of departure transmitting positive polarity or the negative pulse of one group, another group line transmitting rp pulse;
Step S2, receptor, after received beam corresponding to the scanning line that receives step S1 transmitting, for the corresponding actual received beam of the overlapping expectation received beam in locus, sums up processing, obtains harmonic signal.
As a kind of embodiment, emitter arranges the scanning line of transmitting is divided into two groups of odd evens, and controls wherein line of departure transmitting positive polarity or the negative pulse (in the embodiment of the present invention, take positive pulse as example) of even number set, odd number group line transmitting rp pulse.As shown in Figure 1, T
+0, T
+2, T
+4 is the even number line of departure, transmitting be positive pulse, it is (R that corresponding expectation receives line
+01, R
+02), (R
+21, R
+22), (R
+41, R
+42), and actual distortion received beam is (R
+01 ', R
+02 '), (R
+21 ', R
+22 '), (R
+41 ', R
+42 '); T_1, T_3 is the odd number line of departure, transmitting be rp pulse, it be (R_11, R_12) that corresponding expectation receives line, (R_31, R_32), and the distortion received beam of reality is (R_11 ', R_12 '), (R_31 ', R_32 ');
T wherein
+the expectation received beam R of 0 correspondence
+the 02 expectation received beam R_11 corresponding with T_1 is overlapping on locus, wherein T
+the expectation received beam R of 2 correspondences
+21 expectation received beam R_12s corresponding with T_1 are overlapping on locus.The rest may be inferred, and a wave beam in expectation received beam that each line of departure the is corresponding expectation received beam corresponding with two adjacent lines of departure is overlapping on locus.Like this, from scanning sequential, basically identical with normal simple beam scanning, need to not adopt the method for the embodiment of the present invention not improve frame frequency in each transmitting site repeat its transmission twice, the frame frequency of its frame frequency and current techniques is basically identical.As the formula (1), for the overlapping expectation received beam in locus, actual wave beam is summed up to processing, obtain harmonic signal.
R0’=R
+01’,R1’=R
+02’+R_11’，R2’=R
+21’+R_12’，
R3’=R
+22’+R_31’,R4’=R
+41’+R_32’，…（1）
The rest may be inferred, can obtain adding and after wave beam.These have overlapping wave beam, and polarity is contrary, take to add and can remove fundametal compoment, strengthen harmonic component.Due to T
+0 and the T_1 R overlapping to locus
+02 and the phase-inversion symmetric that pulls effect of R_11, after taking to add and processing, just compensated again distortion separately, the overlapping wave beam in other space is also all by adding and having compensated distortion.
Preferably, as a kind of embodiment, in described step S2, also comprise the steps:
Step S2 ', receptor, for there is no the corresponding actual received beam of the overlapping expectation received beam of wave beam, carries out direct filtering, extracts harmonic component; Or described in giving up, there is no the corresponding actual received beam of the overlapping expectation received beam of wave beam.
In the embodiment of the present invention, as shown in Figure 1, leftmost line and rightmost line are distortion lines, and in this position, do not have wave beam overlapping with it, cannot sum up.For these two received beams, in the embodiment of the present invention, as a kind of embodiment, can be handled as follows: 1, directly filtering, extract harmonic component; 2, give up this two received beams.
Based on same inventive concept, the embodiment of the present invention one also provides a kind of multi-beam pulse inversion imaging system, comprises emitter and receptor, wherein:
Described emitter comprises that first arranges module, the first control module, wherein:
Described first arranges module, for the scanning line setting of transmitting is divided into two groups of odd evens;
Described the first control module, arranges for controlling first two groups of scanning lines that module arranges, and wherein the line of departure of a group is launched positive polarity or negative pulse, another group line transmitting rp pulse;
Described receptor comprises that first adds and module, wherein:
Described first adds and module, after received beam corresponding to the scanning line receiving emitter transmitting, for the corresponding actual received beam of the overlapping expectation received beam in locus, sums up processing, obtains harmonic signal.
Preferably, as a kind of embodiment, described receptor also comprises that the first filtration module and first gives up module, wherein:
Described the first filtration module, for for there is no the corresponding actual received beam of the overlapping expectation received beam of wave beam, carries out direct filtering, extracts harmonic component;
Described first gives up module, for for not having the corresponding actual received beam of the overlapping expectation received beam of wave beam to give up.
The multi-beam pulse inversion imaging system of the embodiment of the present invention one, with the process work identical with described multi-beam pulse inversion formation method, therefore, in the embodiment of the present invention one, describes in detail no longer one by one.
Pulse inversion formation method and the system of the embodiment of the present invention one multi-beam, by the opposite polarity pulse of parity line alternate emission, the received beam that adjacent transmission line is corresponding is spatially overlapping, then by adding and processing, both reach extraction harmonic component, reached again the object of beam alignment.
Embodiment bis-:
Same inventive concept based on embodiment mono-, in the embodiment of the present invention two, provides the pulse inversion formation method of multi-beam under a kind of multifocal point, comprises the steps:
Step S10, emitter is divided into two groups of odd evens by the scanning line setting of transmitting in i transmitting focus, and controls wherein one group of transmitting positive polarity or negative pulse, another group transmitting rp pulse;
Wherein, i=1 ..., N, N is more than or equal to 2 positive integer;
Step S20, receptor receives after the received beam that the scanning line of i transmitting focus of step S10 transmitting is corresponding, for the corresponding actual received beam of the overlapping expectation received beam in locus, sum up processing, obtain the harmonic signal of i transmitting focus;
Step S30, carries out focal point mosaic to the harmonic signal obtaining in N focus, obtains final harmonic signal.
According to the description of embodiment mono-, owing to all obtaining distortionless harmonic signal in a plurality of focuses, spliced signal is also distortionless harmonic signal, as a kind of embodiment, nonoverlapping two wave beams for edge are distortion wave beam, and directly filtering is extracted harmonic signal or given up this two wave beams.
As shown in Figure 2, as a kind of embodiment, two the transmitting focuses of take are below example, and the pulse inversion formation method of multi-beam under the multifocal point of the embodiment of the present invention two is described, comprise the steps:
1), emitter is divided into transmit scan line setting two groups of odd evens in the first transmitting focus, controls even number array line transmitting positive polarity or negative pulse (take positive pulse as example), odd number group line transmitting rp pulse.
As shown in Figure 2, T+0, T+2, T+4 is the even number line of departure, what launch is positive pulse, T-1, T-3 is the odd number line of departure, what launch is rp pulse, the expectation received beam R-11 that expectation received beam R+02 that wherein T+0 is corresponding is corresponding with T-1 is overlapping on locus, the expectation received beam R-12 that expectation received beam R+21 that wherein T+2 is corresponding is corresponding with T-1 is overlapping on locus, and the rest may be inferred, and a wave beam in expectation received beam that each line of departure the is corresponding expectation received beam corresponding with two adjacent lines of departure is overlapping on locus;
2), receptor is received after wave beam, for the overlapping expectation received beam in locus, actual wave beam is summed up to processing, obtains harmonic signal, adds with method identical with formula (1).Like this through adding and after, due to the phase-inversion symmetric that pulls effect of the folded received beam of adjacent transmission line counterweight, just obtain distortionless harmonic signal in first transmitting focus (two that ignore edge receive scanning lines);
3), then in second focus, repeat above-mentioned steps 1), in second focus, just transmit scan line is divided into two groups of odd evens, even number array line transmitting positive polarity or negative pulse (take positive pulse as example), odd number group line transmitting rp pulse, a wave beam in expectation received beam that each line of departure the is corresponding expectation received beam corresponding with two adjacent lines of departure is overlapping on locus, for the overlapping expectation received beam in locus;
4), actual wave beam is summed up to processing and obtain distortionless harmonic signal in second transmitting focus;
5), the harmonic signal obtaining is carried out to focal point mosaic in two transmitting focuses, obtain final harmonic signal.
Due in two focuses, all obtain distortionless harmonic signal, therefore spliced signal is also distortionless harmonic signal.Same, two wave beams that wave beam is distortion at edge, can take direct filtering to extract harmonic signal or the method for giving up these two wave beams is processed two of edge and received lines.
As a kind of embodiment, described two focuses can extend to any focus number and be not limited to two.
Based on same inventive concept, the embodiment of the present invention two also provides multi-beam pulse inversion imaging system under a kind of multifocal point, comprises emitter and receptor, wherein:
Described emitter comprises that second arranges module, the second control module, wherein:
Described second arranges module, in i transmitting focus, the scanning line setting of transmitting being divided into two groups of odd evens, and controls wherein one group of transmitting positive polarity or negative pulse, another group transmitting rp pulse;
Wherein, i=1 ..., N, N is more than or equal to 2 positive integer;
Described the second control module, arranges for controlling second two groups of scanning lines that module arranges, and wherein the line of departure of a group is launched positive polarity or negative pulse, another group line transmitting rp pulse;
Described receptor comprises that second adds and module and the first concatenation module, wherein:
Described second adds and module, after received beam corresponding to the scanning line of i transmitting focus receiving emitter transmitting, for the corresponding actual received beam of the overlapping expectation received beam in locus, sum up processing, obtain the harmonic signal of i transmitting focus;
Described the first concatenation module, for the harmonic signal obtaining in N focus is carried out to focal point mosaic, obtains final harmonic signal.
Preferably, as a kind of embodiment, described receptor also comprises filtration module and give up module, wherein:
Described filtration module, for for there is no the corresponding actual received beam of the overlapping expectation received beam of wave beam, carries out direct filtering, extracts harmonic component;
The described module of giving up, for for not having the corresponding actual received beam of the overlapping expectation received beam of wave beam to give up.
Multi-beam pulse inversion imaging system under the multifocal point of the embodiment of the present invention two, with the process work identical with multi-beam pulse inversion formation method under multifocal point described in embodiment bis-, therefore, in the embodiment of the present invention two, describes in detail no longer one by one.
Pulse inversion formation method and the system of multi-beam under the multifocal point of the embodiment of the present invention two, by the opposite polarity pulse of parity line alternate emission, the received beam that adjacent transmission line is corresponding is spatially overlapping, again by adding and processing, both reach extraction harmonic component, reached again the object of beam alignment.
Embodiment tri-:
Same inventive concept based on embodiment mono-and embodiment bis-, in the embodiment of the present invention three, provides the pulse inversion formation method of different beams under a kind of multifocal point, comprises the steps:
Step S100, emitter carries out different wave beams for different transmitting focuses to be controlled, according to focus configuration numbers of beams;
In embodiment tri-, the pulse inversion imaging technique of multi-beam of the present invention, in multifocal some situation, carries out different wave beams to different transmitting focuses and controls, according to focus configuration numbers of beams.
As a kind of embodiment, preferably, describedly according to focus configuration numbers of beams, refer in the near field of emitter and be configured to simple beam, in the middle far field of emitter, be configured to dualbeam or four wave beams or more wave beam.
More preferably, as a kind of embodiment, described emitter carries out different wave beams to different transmitting focuses to be controlled, and according to focus configuration numbers of beams, by following engineering parameter, controls:
Focal position [pos
1pos
2pos
n]
Numbers of beams [M
1m
2m
n]
Wherein, M
1=1, M
2=2 ...According to different application, there is different configurations.To different transmitting focuses, keep the reception line number of expectation the same with the position of line.
If the reception line density of image is L, corresponding line of departure number in different focuses so:
Line of departure number [L/M
1l/M
2l/M
n]
The position of the line of departure is determined according to the position and the numbers of beams that receive line.
Step S200, emitter is controlled and is taked simple beam, in the first transmitting focus transmitting positive pulse or negative pulse;
Step S300, emitter is controlled at same position transmitting rp pulse;
Step S400, receptor receives after the echo wave beam of priority twice emitting of the first transmitting focus of step S200～300 transmittings, and the first transmitting focus echo-signal that successively twice emitting produces is summed up;
Step S500, emitter configures numbers of beams M in i transmitting focus, arranges the scanning line in i transmitting focus is divided into two groups of odd evens, and control wherein one group of transmitting positive polarity or negative pulse, another group transmitting rp pulse;
Wherein, i=2 ..., N, N, M are more than or equal to 2 positive integer;
Step S600, receptor receives after the received beam that the scanning line of i transmitting focus of step S500 transmitting is corresponding, for the corresponding actual received beam of the overlapping expectation received beam in locus, sum up processing, obtain the harmonic signal of i transmitting focus;
Step S700, the harmonic signal that the first transmitting focus is added and obtained, and the harmonic signal obtaining in other N-1 focus carries out focal point mosaic, obtains final harmonic signal.
Preferably, as shown in Figure 3, below with two transmitting focuses, and first focus is near field, and second focus is example in far field, and the pulse inversion formation method of different beams under the multifocal point of the embodiment of the present invention three is described, step is as follows:
1 '), take simple beam, in the first transmitting focus transmitting positive pulse (can be also negative pulse),
2 '), at same position transmitting rp pulse;
3 '), the first transmitting focus echo-signal that successively twice emitting produces is summed up.
Owing to taking simple beam, launching beam and received beam overlap, and can not produce distortion like this, therefore add and process after obtain distortionless harmonic signal in the first transmitting focus situation;
4 '), in the second transmitting focus, take multi-beam (2 wave beam), transmit scan line is divided into two groups of odd evens, even number array line transmitting positive polarity or negative pulse (take positive pulse as example), odd number group line transmitting rp pulse;
5 '), a wave beam in expectation received beam that each line of departure the is corresponding expectation received beam corresponding with two adjacent lines of departure is overlapping on locus, for the overlapping expectation received beam in locus, actual wave beam is summed up to processing, obtain second harmonic signal in transmitting focus.
Due to the phase-inversion symmetric that pulls effect of the folded received beam of adjacent transmission line counterweight, make to add and after just obtain distortionless harmonic signal.
In the first transmitting focus and the second transmitting focus situation, the position that receives line is consistent, and as R+0 and R+01, the position of R+1 and R+02 is all identical, and other received beam position is also identical.Due to the first transmitting focus and the second transmitting focus, take different numbers of beams, it is not identical causing the position of the first transmitting focus and the second transmitting focus line of departure, if the T+0 position of the T+0 of the first transmitting focus and the second transmitting focus is not identical;
6 '), the harmonic signal obtaining is carried out to focal point mosaic in two transmitting focuses, obtain final harmonic signal.
Due in two focuses, all obtain distortionless harmonic signal, therefore spliced signal is also distortionless harmonic signal.
Preferably, as a kind of embodiment, the wave beam at edge is the wave beam of distortion in the second transmitting focus situation, can take following method to process: 1. directly the harmonic signal in the second transmitting focus situation is extracted in filtering, and then splice with the harmonic signal in the first transmitting focus situation; 2. the wave beam of giving up the first transmitting focus and the second transmitting focus situation lower limb.
As a kind of embodiment, described two focuses can extend to any focus number and be not limited to two.
Based on same inventive concept, the embodiment of the present invention three also provides different beams pulse inversion imaging system under a kind of multifocal point, comprises emitter and receptor, wherein:
Described emitter comprises the first configuration module, the 3rd control module, and the 3rd adds and module, the 3rd module is set, the 4th control module, the 4th adds and module, the second concatenation module, wherein:
Described the first configuration module, carries out different wave beams for the transmitting focus for different and controls, according to focus configuration numbers of beams;
Described the 3rd control module, takes simple beam for controlling, in the first transmitting focus transmitting positive pulse or negative pulse; And be controlled at same position transmitting rp pulse;
The described the 3rd arranges module, in i transmitting focus, the scanning line setting of transmitting being divided into two groups of odd evens, and controls wherein one group of transmitting positive polarity or negative pulse, another group transmitting rp pulse;
Wherein, i=2 ..., N, N is more than or equal to 2 positive integer;
Described the 4th control module, arranges for controlling the 3rd two groups of scanning lines that module arranges, and wherein the line of departure of a group is launched positive polarity or negative pulse, another group line transmitting rp pulse;
Described receptor comprises that the 3rd adds with module, the 4th and add and module and the second concatenation module, wherein:
The described the 3rd adds and module, for receiving after the echo wave beam of priority twice emitting of the first transmitting focus of emitter transmitting, the first transmitting focus echo-signal that successively twice emitting produces is summed up;
The described the 4th adds and module, after received beam corresponding to the scanning line of i transmitting focus receiving emitter transmitting, for the corresponding actual received beam of the overlapping expectation received beam in locus, sum up processing, obtain the harmonic signal of i transmitting focus;
Described the second concatenation module, for the harmonic signal that the first transmitting focus is added and obtained, and the harmonic signal obtaining in other N-1 focus carries out focal point mosaic, obtains final harmonic signal.
Preferably, as a kind of embodiment, described receptor is filtration module and give up module also, wherein:
Described filtration module, for for there is no the corresponding actual received beam of the overlapping expectation received beam of wave beam, carries out direct filtering, extracts harmonic component;
The described module of giving up, for for not having the corresponding actual received beam of the overlapping expectation received beam of wave beam to give up.
Different beams pulse inversion imaging system under the multifocal point of the embodiment of the present invention three, with the process work identical with different beams pulse inversion formation method under multifocal point described in embodiment tri-, therefore, in the embodiment of the present invention three, describes in detail no longer one by one.
The pulse inversion formation method of multi-beam of the present invention, only need be added the echo-signal successively receiving, and just can realize wave beam distortion correction simultaneously and obtain the object of harmonic signal, and reduction is for the complexity of echo signal processing; In multifocal some situation, different focuses are carried out to different received beam configurations, when guaranteeing frame frequency, can farthest reduce the quality that wave beam distortion and Operating Complexity improve pulse inversion image again.
The above embodiment has only expressed several embodiment of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (14)
1. a pulse inversion formation method for multi-beam, is characterized in that, comprises the steps:
Step S1, emitter is divided into two groups of odd evens by the scanning line setting of transmitting, and controls wherein line of departure transmitting positive polarity or the negative pulse of one group, another group line transmitting rp pulse;
Step S2, receptor, after received beam corresponding to the scanning line that receives step S1 transmitting, for the corresponding actual received beam of the overlapping expectation received beam in locus, sums up processing, obtains harmonic signal.
2. the pulse inversion formation method of multi-beam according to claim 1, is characterized in that, in described step S2, also comprises the steps:
Step S2 ', receptor, for there is no the corresponding actual received beam of the overlapping expectation received beam of wave beam, carries out direct filtering, extracts harmonic component; Or described in giving up, there is no the corresponding actual received beam of the overlapping expectation received beam of wave beam.
3. a multi-beam pulse inversion imaging system, is characterized in that, comprises emitter and receptor, wherein:
Described emitter comprises that first arranges module, the first control module, wherein:
Described first arranges module, for the scanning line setting of transmitting is divided into two groups of odd evens;
Described the first control module, arranges for controlling first two groups of scanning lines that module arranges, and wherein the line of departure of a group is launched positive polarity or negative pulse, another group line transmitting rp pulse;
Described receptor comprises that first adds and module, wherein:
Described first adds and module, after received beam corresponding to the scanning line receiving emitter transmitting, for the corresponding actual received beam of the overlapping expectation received beam in locus, sums up processing, obtains harmonic signal.
4. multi-beam pulse inversion imaging system according to claim 3, is characterized in that, described receptor also comprises that the first filtration module and first gives up module, wherein:
Described the first filtration module, for for there is no the corresponding actual received beam of the overlapping expectation received beam of wave beam, carries out direct filtering, extracts harmonic component;
Described first gives up module, for for not having the corresponding actual received beam of the overlapping expectation received beam of wave beam to give up.
5. a pulse inversion formation method for multi-beam under multifocal point, is characterized in that, comprises the steps:
Step S10, emitter is divided into two groups of odd evens by the scanning line setting of transmitting in i transmitting focus, and controls wherein one group of transmitting positive polarity or negative pulse, another group transmitting rp pulse;
Wherein, i=1,2 ..., N, N is more than or equal to 2 positive integer;
Step S20, receptor receives after the received beam that the scanning line of i transmitting focus of step S10 transmitting is corresponding, for the corresponding actual received beam of the overlapping expectation received beam in locus, sum up processing, obtain the harmonic signal of i transmitting focus;
Step S30, carries out focal point mosaic to the harmonic signal obtaining in N focus, obtains final harmonic signal.
6. the pulse inversion formation method of multi-beam under multifocal point according to claim 5, is characterized in that, in described step S20, also comprises the steps:
Step S20 ', receptor, for there is no the corresponding actual received beam of the overlapping expectation received beam of wave beam, carries out direct filtering, extracts harmonic component; Or described in giving up, there is no the corresponding actual received beam of the overlapping expectation received beam of wave beam.
7. a multi-beam pulse inversion imaging system under multifocal point, is characterized in that, comprises emitter and receptor, wherein:
Described emitter comprises that second arranges module, the second control module, wherein:
Described second arranges module, in i transmitting focus, the scanning line setting of transmitting being divided into two groups of odd evens, and controls wherein one group of transmitting positive polarity or negative pulse, another group transmitting rp pulse;
Wherein, i=1,2 ..., N, N is more than or equal to 2 positive integer;
Described the second control module, arranges for controlling second two groups of scanning lines that module arranges, and wherein the line of departure of a group is launched positive polarity or negative pulse, another group line transmitting rp pulse;
Described receptor comprises that second adds and module and the first concatenation module, wherein:
Described second adds and module, after received beam corresponding to the scanning line of i transmitting focus receiving emitter transmitting, for the corresponding actual received beam of the overlapping expectation received beam in locus, sum up processing, obtain the harmonic signal of i transmitting focus;
Described the first concatenation module, for the harmonic signal obtaining in N focus is carried out to focal point mosaic, obtains final harmonic signal.
8. multi-beam pulse inversion imaging system under multifocal point according to claim 7, is characterized in that, described receptor also comprises filtration module and give up module, wherein:
Described filtration module, for for there is no the corresponding actual received beam of the overlapping expectation received beam of wave beam, carries out direct filtering, extracts harmonic component;
The described module of giving up, for for not having the corresponding actual received beam of the overlapping expectation received beam of wave beam to give up.
9. a pulse inversion formation method for different beams under multifocal point, is characterized in that, comprises the steps:
Step S100, emitter carries out different wave beams for different transmitting focuses to be controlled, according to focus configuration numbers of beams;
Step S200, emitter is controlled and is taked simple beam, in the first transmitting focus transmitting positive pulse or negative pulse;
Step S300, emitter is controlled at same position transmitting rp pulse;
Step S400, receptor receives after the echo wave beam of priority twice emitting of the first transmitting focus of step S200～300 transmittings, and the first transmitting focus echo-signal that successively twice emitting produces is summed up;
Step S500, emitter configures numbers of beams M in i transmitting focus, arranges the scanning line in i transmitting focus is divided into two groups of odd evens, and control wherein one group of transmitting positive polarity or negative pulse, another group transmitting rp pulse;
Wherein, i=2 ..., N, N, M are more than or equal to 2 positive integer;
Step S600, receptor receives after the received beam that the scanning line of i transmitting focus of step S500 transmitting is corresponding, for the corresponding actual received beam of the overlapping expectation received beam in locus, sum up processing, obtain the harmonic signal of i transmitting focus;
Step S700, the harmonic signal that the first transmitting focus is added and obtained, and the harmonic signal obtaining in other N-1 focus carries out focal point mosaic, obtains final harmonic signal.
10. the pulse inversion formation method of different beams under multifocal point according to claim 9, is characterized in that, described step S600 comprises the steps:
Step S600 ', receptor, for there is no the corresponding actual received beam of the overlapping expectation received beam of wave beam, carries out direct filtering, extracts harmonic component; Or described in giving up, there is no the corresponding actual received beam of the overlapping expectation received beam of wave beam.
11. according to the pulse inversion formation method of different beams under the multifocal point described in claim 9 or 10, it is characterized in that, in described step S100, according to focus configuration numbers of beams, refer in the near field of emitter and be configured to simple beam, in the middle far field of emitter, be configured to dualbeam or four wave beams or more wave beam.
Under 12. multifocal points according to claim 11, the pulse inversion formation method of different beams, is characterized in that, described emitter carries out different wave beams to different transmitting focuses to be controlled, and according to focus configuration numbers of beams, by following engineering parameter, controls:
Focal position [pos
1pos
2pos
n]
Numbers of beams [M
1m
2m
n]
Wherein, M
1=1, M
2=2 ...
Different beams pulse inversion imaging system under 13. 1 kinds of multifocal points, is characterized in that, comprises emitter and receptor, wherein:
Described emitter comprises the first configuration module, the 3rd control module, and the 3rd adds and module, the 3rd module is set, the 4th control module, the 4th adds and module, the second concatenation module, wherein:
Described the first configuration module, carries out different wave beams for the transmitting focus for different and controls, according to focus configuration numbers of beams;
Described the 3rd control module, takes simple beam for controlling, in the first transmitting focus transmitting positive pulse or negative pulse; And be controlled at same position transmitting rp pulse;
The described the 3rd arranges module, in i transmitting focus, the scanning line setting of transmitting being divided into two groups of odd evens, and controls wherein one group of transmitting positive polarity or negative pulse, another group transmitting rp pulse;
Wherein, i=2 ..., N, N is more than or equal to 2 positive integer;
Described the 4th control module, arranges for controlling the 3rd two groups of scanning lines that module arranges, and wherein the line of departure of a group is launched positive polarity or negative pulse, another group line transmitting rp pulse;
Described receptor comprises that the 3rd adds with module, the 4th and add and module and the second concatenation module, wherein:
The described the 3rd adds and module, for receiving after the echo wave beam of priority twice emitting of the first transmitting focus of emitter transmitting, the first transmitting focus echo-signal that successively twice emitting produces is summed up;
The described the 4th adds and module, after received beam corresponding to the scanning line of i transmitting focus receiving emitter transmitting, for the corresponding actual received beam of the overlapping expectation received beam in locus, sum up processing, obtain the harmonic signal of i transmitting focus;
Described the second concatenation module, for the harmonic signal that the first transmitting focus is added and obtained, and the harmonic signal obtaining in other N-1 focus carries out focal point mosaic, obtains final harmonic signal.
Different beams pulse inversion imaging system under 14. multifocal points according to claim 13, is characterized in that, described receptor is filtration module and give up module also, wherein:
Described filtration module, for for there is no the corresponding actual received beam of the overlapping expectation received beam of wave beam, carries out direct filtering, extracts harmonic component;
The described module of giving up, for for not having the corresponding actual received beam of the overlapping expectation received beam of wave beam to give up.
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