CN103142252A - Method and system for realizing automatic deflection of spectral Doppler angle - Google Patents
Method and system for realizing automatic deflection of spectral Doppler angle Download PDFInfo
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- CN103142252A CN103142252A CN2013100919844A CN201310091984A CN103142252A CN 103142252 A CN103142252 A CN 103142252A CN 2013100919844 A CN2013100919844 A CN 2013100919844A CN 201310091984 A CN201310091984 A CN 201310091984A CN 103142252 A CN103142252 A CN 103142252A
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Abstract
The invention provides a method and system for realizing automatic deflection of a spectral Doppler angle. The method comprises the following steps: configuring ultrasound scanning lines of a plurality of scanning angles; transmitting the ultrasound scanning lines to a tissue to be detected; acquiring back wave data corresponding to each deflection angle; carrying out fast Fourier transform on the back wave data of each deflection angle in a pulse repetition frequency domain; and determining the deflection angle corresponding to the maximum value in each energy to be a best angle needed to be deflected in ultrasound scanning. With the adoption of the method and the system, the condition that at least one transmitting wave beam at one direction is not vertical to a bleeding direction can be satisfied through configuring transmitting wave beams of a plurality of deflection angles, an optimum deflection angle can be automatically acquired, so that automatic deflection of the spectral Doppler angle can be realized through the optimum deflection angle; and the sensitivity of spectral Doppler is improved. With the adoption of the method and the system, the working process of doctors can be simplified, and the operation is convenient.
Description
Technical field
The present invention relates to the medical ultrasound image field, relate in particular to a kind of method and system that realize the automatic deflection of frequency spectrum Doppler angle.
Background technology
Frequency spectrum Doppler imaging technique and color Doppler imaging are the topmost two kinds of means in present blood flow imaging field.Color Doppler imaging can provide blood distribution situation intuitively, but lacks the ability of quantitative analysis blood flow movement velocity; The frequency spectrum Doppler imaging technique but can detect blood flow rate accurate quantitative analysis, thereby the frequency spectrum Doppler imaging technique more is applied to blood flow detection.
For the frequency spectrum Doppler imaging technique, depend on Doppler effect.When ultrasonic sound beam direction was vertical with the flow direction of blood flow, according to Doppler effect, Doppler frequency deviation is intimate at this moment was 0.Therefore very low to the sensitivity of blood flow signal in this case, also just can not get high-quality spectrogram, thereby affect the extraction of blood flow relevant parameter.At present, nearly all supersonic imaging apparatus all provides deflection, when the doctor sees that sound beam direction and blood flow flow near vertical, the doctor can (for example carry out deflection with acoustic beam by enabling deflection, 15 spend to the left or to the right), so that sound beam direction and blood flow flow to out of plumb, thus the sensitivity of raising frequency spectrum Doppler imaging.This specification requirement doctor is according to the yawing moment of always constantly adjusting ultrasonic acoustic beam of walking of blood flow, thereby increased doctor's workflow, and sometimes be difficult to judgement blood flow trend (easily erroneous judgement) from X-Y scheme, the doctor can only travel through all yawing moments one time, find optimum velocity of sound deflection angle, operate more loaded down with trivial details.
Summary of the invention
The technical problem of solution required for the present invention is to provide a kind of method that realizes the automatic deflection of frequency spectrum Doppler angle, and the frequency spectrum Doppler deflection angle of its automatic acquisition the best is also realized deflection, thereby guarantees the sensitivity of blood flow imaging, optimizes the quality of ultrasonoscopy.
Correspondingly, the present invention also provides a kind of system that realizes the automatic deflection of frequency spectrum Doppler angle.
For solving the problems of the technologies described above, technical scheme of the present invention is:
A kind of method that realizes the automatic deflection of frequency spectrum Doppler angle comprises the steps:
S1, the configuration a plurality of corresponding to the scanning angle A
1~ A
NUltrasonic scan line T
1~ T
N, and different sampling gate SV is set for the scanning line correspondence of different directions
1~ SV
N, wherein, N 〉=2;
S2, has the scanning angle A to tissue to be detected emission
1~ A
NUltrasonic scan line T
1~ T
N
S3, reception are corresponding to deflection angle A
1~ A
NReceived beam R
1~ R
N, and obtain N the corresponding echo data of deflection angle, and wherein, received beam R
1~ R
NThe corresponding sampling gate SV of difference
1~ SV
N
S4, to the sampling gate SV of N deflection angle
1~ SV
NEcho data do the fast Fourier transform that K is ordered on the pulse recurrence frequency territory, to obtain the blood flow frequency spectrum P on N direction
i(m), calculate the energy P of the blood flow frequency spectrum that obtains all directions
i, and with each energy P
iIn maximum P
maxCorresponding deflection angle is defined as the best angle of the required deflection of ultrasonic scan, wherein,
Further improve as the present invention, described step S2 specifically comprises: obtain respectively ultrasonic scan line T
1~ T
NIn the left margin Bj of each root scanning line
L, right margin Bj
R, wherein, 1≤j≤N; Determine the left margin B of the final broad beam that forms according to the left and right border of each scanning line that obtains
L, right margin B
R, wherein,
Further improve as the present invention, the method also comprises: the velocity amplitude of estimating blood flow in tissue to be measured
, wherein, φ
tBe the angle between launching beam vector and blood flow rate vector, φ
rBe the angle between received beam vector and blood flow rate vector, f
dBe Doppler frequency shift, f
0Be tranmitting frequency.
Further improve as the present invention, described step S2 also comprises: transmitting aperture M is configured to N sub-aperture, and different emission scanning angle of every corresponding configuration in sub-aperture.
Further improve as the present invention, described step S2 also comprises: configuration the second transmitting aperture Ms, wherein, Ms=k*M, 0＜k＜1; Configure interior all primitives of described the second transmitting aperture Ms and work in the 0o transmit direction.
Further improve as the present invention, described step S3 specifically comprises: configuring current scanning aperture is M, and the received beam number of work at present is P, wherein, and P 〉=N; With the degree of depth at the place, center of 0o reference line sampling gate as starting point, according to the scanning angle A of internal engineering parameter configuration
1~ A
NThe reception scanning line R of different directions is set
1~ R
N, the reception line of different directions arranges different sampling gate SV; Obtain respectively deflection angle A
1~ A
NCorresponding echo data, and calculate reception delay focusing with R
1~ R
NCentered by reference line.
Correspondingly, the system that realizes the automatic deflection of frequency spectrum Doppler angle provided by the invention, it comprises:
Dispensing unit, a plurality of corresponding to the scanning angle A for configuring
1~ A
NUltrasonic scan line T
1~ T
N, and different sampling gate SV is set for the scanning line correspondence of different directions
1~ SV
N, wherein, N 〉=2;
Emission controlling unit, be used for having the scanning angle A to tissue emission to be detected
1~ A
NUltrasonic scan line T
1~ T
N
Reception control unit, be used for to receive corresponding to deflection angle A
1~ A
NReceived beam R
1~ R
N, and obtain N the corresponding echo data of deflection angle, and wherein, received beam R
1~ R
NThe corresponding sampling gate SV of difference
1~ SV
N
The deflection decision package, be used for the sampling gate SV to N deflection angle
1~ SV
NEcho data do the fast Fourier transform that K is ordered on the pulse recurrence frequency territory, to obtain the blood flow frequency spectrum P on N direction
i(m), calculate the energy P of the blood flow frequency spectrum that obtains all directions
i, and with each energy P
iIn maximum P
maxCorresponding deflection angle is defined as the best angle of the required deflection of ultrasonic scan, wherein,
Further improve as the present invention, described emission controlling unit specifically is used for: obtain respectively ultrasonic scan line T
1~ T
NIn the left margin Bj of each root scanning line
L, right margin Bj
R, wherein, 1≤j≤N; Determine the left margin B of the final broad beam that forms according to the left and right border of each scanning line that obtains
L, right margin B
R, wherein,
Further improve as the present invention, this system also is used for: the velocity amplitude of estimating tissue blood flow to be measured
, wherein, φ
tBe the angle between launching beam vector and blood flow rate vector, φ
rBe the angle between received beam vector and blood flow rate vector, f
dBe Doppler frequency shift, f
0Be tranmitting frequency.
Further improve as the present invention, described emission controlling unit also is used for: transmitting aperture M is configured to N sub-aperture, and different emission scanning angle of every corresponding configuration in sub-aperture.
Further improve as the present invention, described emission controlling unit also is used for: configuration the second transmitting aperture Ms, wherein, Ms=k*M, 0＜k＜1; Configure interior all primitives of described the second transmitting aperture Ms and work in the 0o transmit direction.
Further improve as the present invention, described reception control unit also is used for: configuring current scanning aperture is M, and the received beam number of work at present is P, wherein, and P 〉=N; With the degree of depth at the place, center of 0o reference line sampling gate as starting point, according to the scanning angle A of internal engineering parameter configuration
1~ A
NThe reception scanning line R of different directions is set
1~ R
N, the reception line of different directions arranges different sampling gate SV; Obtain respectively deflection angle A
1~ A
NCorresponding echo data, and calculate reception delay focusing with R
1~ R
NCentered by reference line.
Can find out according to above technical scheme, the present invention is by the launching beam of a plurality of deviation angles of configuration, make it satisfy the launching beam blood flow direction out of plumb that has a direction at least, and it can automatic acquisition optimized migration angle and realizes the automatic deflection of frequency spectrum Doppler angle, the sensitivity that improves frequency spectrum Doppler with this optimized migration angle; The present invention simplifies doctor's workflow, and is easy to operate.
Description of drawings
Fig. 1 is the flow chart of realizing the method for the automatic deflection of frequency spectrum Doppler angle in the specific embodiment of the invention;
Fig. 2 is the principle schematic of ultrasonic beam emission control mode in the specific embodiment of the invention;
Fig. 3 is the schematic diagram of ultrasonic beam launching beam in the specific embodiment of the invention;
Fig. 4 is the principle schematic of ultrasonic beam emission control mode in another embodiment of the present invention;
Fig. 5 is the principle schematic that in the specific embodiment of the invention, ultrasonic beam receives control mode;
Fig. 6 A, 6B, 6C show the vectogram of launching beam in the embodiment of the present invention, received beam and blood flow velocity jointly;
Fig. 7 is the cell schematics that realizes the system of the automatic deflection of frequency spectrum Doppler angle in the specific embodiment of the invention.
The specific embodiment
Describe the present invention below with reference to the specific embodiment shown in the drawings.But these embodiments do not limit the present invention, and based on various embodiments of the present invention, those of ordinary skill in the art all should be included in protection scope of the present invention not making the every other embodiment that obtains under the prerequisite of creative work.
Join shown in Figure 1ly, in an embodiment of the present invention, the described method that realizes the automatic deflection of frequency spectrum Doppler angle comprises the steps:
S1, the configuration a plurality of corresponding to the scanning angle A
1~ A
NUltrasonic scan line T
1~ T
N, and different sampling gate SV is set for the scanning line correspondence of different directions
1~ SV
N, wherein, N 〉=2;
S2, has the scanning angle A to tissue to be detected emission
1~ A
NUltrasonic scan line T
1~ T
N
S3, reception are corresponding to deflection angle A
1~ A
NReceived beam R
1~ R
N, and obtain N the corresponding echo data of deflection angle, and wherein, received beam R
1~ R
NThe corresponding sampling gate SV of difference
1~ SV
N
S4, to the sampling gate SV of N deflection angle
1~ SV
NEcho data do the fast Fourier transform that K is ordered on the pulse recurrence frequency territory, to obtain the blood flow frequency spectrum P on N direction
i(m), calculate the energy P of the blood flow frequency spectrum that obtains all directions
i, and with each energy P
iIn maximum P
maxCorresponding deflection angle is defined as the best angle of the required deflection of ultrasonic scan, wherein,
Below with reference to Fig. 2,3,4,5,6A, 6B and 6C, the principle of method of the present invention is described in detail.Please at first join shown in Figure 2ly, the present invention has provided the emission control mode that realizes the automatic deflection of frequency spectrum Doppler angle, wherein, with the depth S VD at the place, center of 0o reference line sampling gate as starting point, according to the scanning angle A of internal engineering parameter configuration
1~ A
NThe emission scanning line T of different directions is set.Simultaneously, the scanning line of different directions arranges different sampling gate SV
1~ SV
N, the sampling gate SV of all directions
1~ SV
NAlso can use in the wave beam receiving course.Particularly, the parameter configuration of the line of departure, deflection angle and sampling gate is as follows:
T
1，T
2，…，T
N
A
1，A
2，…，A
N
…
SV
1，SV
2，…，SV
N
Wherein, N 〉=2, SV
1, SV
2..., SV
NThe center of sampling gate overlaps with the center of 0o reference line sampling gate.Suppose that current transmitting aperture is M, aperture M is divided into N submatrix, M=Z*N, each submatrix works in an emission scanning direction, and the scanning angle of the distribution method in sub-aperture and correspondence is as follows:
| 1 | 2 | … | |
1 | 2 | … | N | ... | 1 | 2 | … | N |
| A 1 | A 2 | … | A N | A 1 | A 2 | … | A N | … | A 1 | A 2 | … | A N |
The sub-aperture that works in like this an emission scanning direction is Z.Above-mentioned label is that 1 primitive is when transmitting focusing, with T
1Centered by reference line time delay of calculating transmitting focusing, make like this label be 1 primitive when emission to A
1Angle direction deflection; Label is that 2 primitive is when transmitting focusing, with T
2Centered by reference line time delay of calculating transmitting focusing, make like this label be 2 primitive when emission to A
2Angle direction deflection; The like, label is that the primitive of N is when transmitting focusing, with T
NCentered by reference line time delay of calculating transmitting focusing, make like this label be the primitive of N when emission to A
NAngle direction deflection.It is a broad beam that this transmitting focusing control mode makes the wave beam of final formation, and this broad beam will be pushed up the sampling gate SV that draws together all directions
1, SV
2..., SV
N, guarantee that sampling gate on N scanning direction is all within the broad beam energy range that forms.The broad beam that this kind control mode forms is compared with traditional transmitting focusing, the energy of focal position can descend to some extent, but compare with traditional transmitting focusing, take emission control method of the present invention, can improve emitted energy and guarantee that simultaneously acoustical power is no more than again the security legislation requirement.
Fig. 3 has provided wave beam schematic diagram corresponding to beam transmission control mode of the present invention.Wherein, T
1The border, left and right of the wave beam of corresponding-6dB is B1
LAnd B1
R, T
2The border, left and right of the wave beam of corresponding-6dB is B2
LAnd B2
R, the like, T
NThe border, left and right of the wave beam of corresponding-6dB is BN
LAnd BN
R, find as follows position B corresponding to left margin and right margin on the center SVD of 0o reference line sampling gate
L(d) and B
R(d):
B
L(d) =min{B1
L(SVD)，B2
L(SVD)，…，BN
L(SVD)}；
B
R(d) =max{B1
R(SVD)，B2
R(SVD)，…，BN
R(SVD)}；
The wave beam of so final formation is the locational B of SVD
L(d) and B
R(d) the left and right boundary B that forms
LAnd B
RThe broad beam that determines.Due to the symmetric form of positive negative angle, the centrage of the final broad beam that forms still overlaps with the 0o reference line, and being equivalent to like this transmit beam direction is 0o.In the specific embodiment of the invention, for the beam direction that makes final formation is 0o, can also take traditional emission control mode, as shown in Figure 4, this emission control launching beam T only has a 0o direction, takes less transmitting aperture Ms, wherein Ms=k*M, 0＜k＜1, all primitives 1,2 in the aperture so ... Ms takes the 0o transmit direction, and is as follows:
1， 2， 3， …，Ms
0o， 0o，0o， …，0o
Control in the manner described above, can make transmit beam direction is 0o, this emission control mode is for emission, sampling gate only has a SV, and for receiving, N sampling gate is arranged still, because beam angle and transmitting aperture are inversely proportional to, the transmitting aperture is less, and beam angle is wider, therefore takes the small-bore emission energy to make the sampling gate of N direction when receiving all in broad beam energy range.
Based on above emission control mode, the present invention has provided the reception control mode that realizes the automatic deflection of frequency spectrum Doppler angle.As shown in Figure 5, with the depth S VD at the place, center of 0o reference line sampling gate SV as starting point, according to the scanning angle A of internal engineering parameter configuration
1~ A
NThe reception scanning line R of different directions is set
1~ R
N, the reception line of different directions arranges different sampling gate SV.If current scanning aperture is M, the received beam number of work at present is P(P 〉=N, to guarantee a scanning direction, a received beam is arranged), because reception is operated under multi-beam, the collectiong focusing that can guarantee like this all directions can walk abreast and complete.Particularly, the reception line of all directions is as follows with the corresponding relation that receives multi-beam and yawing moment and sampling gate:
R
1， R
2， ， R
N
MLA
1，MLA
2， MLA
N
A
1， A
2， ， A
N
SV
1， SV
2， SV
N
MLA
1Be used for obtaining deflection angle A
1Corresponding echo data calculates reception delay and focuses on R
1Centered by reference line; MLA
2Be used for obtaining deflection angle A
2Corresponding echo data, when calculating reception delay and focusing on R
2Centered by reference line; The like, MLA
NBe used for obtaining deflection angle A
NThe echo data of correspondence, when calculating reception delay and focusing on R
NCentered by reference line.
Based on above emission control method and the acceptance control method of realizing the automatic deflection of frequency spectrum Doppler angle, the present invention has provided the flow velocity method of estimation that realizes the automatic deflection of frequency spectrum Doppler angle.Fig. 6 A ~ Fig. 6 C has provided the vectogram of emission reception acoustic beam and blood flow velocity, and wherein, the erythrocytic velocity in blood vessel is
, the vector of launching beam is
,
Amplitude be w
0/ c, wherein, w
0=2 π f
0, f
0Be tranmitting frequency,
cBe the velocity of sound in tissue.
Direction introduced in front, consistent with the 0o reference line,
Be the received beam vector, its amplitude is (w
0+ w
d)/c (approximates w
0/ c is at w
d＜＜w
0The time), wherein, because final launching beam is all the 0o direction, and the received beam direction vector is consistent with the yawing moment of internal preset, so Doppler frequency shift w
d(=2 π f
0) be:
In the present invention, when
With (
-
) during out of plumb, will produce Doppler frequency shift.By the vector composite diagram in Fig. 6 A ~ Fig. 6 C, due to the deflection of received beam to N direction, final formation (
-
) N direction also arranged, therefore, no matter the blood flow whichaway flows, always a direction and velocity vector are arranged
Out of plumb has guaranteed the sensitivity of frequency spectrum Doppler like this.If be converted into scalar, the method for estimation of blood flow rate is as follows,
Wherein, V is the blood flow rate amplitude, φ
tBe the angle between launching beam vector and blood flow rate vector, φ
rBe the angle between received beam vector and blood flow rate vector, f
dBe Doppler frequency shift.
Based on above configuration mode, the present invention has provided the decision method of the automatic deflection angle of frequency spectrum Doppler.Wherein, the IQ data of the sampling gate of N yawing moment are done the fast Fourier transform that K is ordered on the pulse recurrence frequency territory, obtain the blood flow frequency spectrum P of N direction
i(m), then summation obtains gross energy P to the blood flow frequency spectrum of each direction
i, wherein,
Then find P
iIn maximum P
max, and with P
max(
) corresponding deflection angle is as final deflection angle.
Next, please refer to shown in Figure 7ly, it realizes the cell schematics of the system of the automatic deflection of frequency spectrum Doppler angle for the present invention.Wherein, system embodiment described herein is only schematic, and the concrete technical characterictic in system embodiment of the present invention, function, technique effect etc. please refer to the embodiment of the method that realizes the automatic deflection of frequency spectrum Doppler angle of putting down in writing in literary composition, are hereinafter no longer described in detail.
In certain embodiments of the invention, realize the system of the automatic deflection of frequency spectrum Doppler angle, it comprises:
In the specific embodiment of the invention, this system also is used for: the velocity amplitude of estimating tissue blood flow to be measured
, wherein, φ
tBe the angle between launching beam vector and blood flow rate vector, φ
rBe the angle between received beam vector and blood flow rate vector, f
dBe Doppler frequency shift, f
0Be tranmitting frequency.
In sum, the present invention is by the launching beam of a plurality of deviation angles of configuration, make it satisfy the launching beam blood flow direction out of plumb that has a direction at least, and it can automatic acquisition optimized migration angle and realizes the automatic deflection of frequency spectrum Doppler angle, the sensitivity that improves frequency spectrum Doppler with this optimized migration angle; The present invention simplifies doctor's workflow, and is easy to operate.
Be to be understood that, although this description is described according to embodiment, but be not that each embodiment only comprises an independently technical scheme, this narrating mode of description is only for clarity sake, those skilled in the art should make description as a whole, technical scheme in each embodiment also can through appropriate combination, form other embodiments that it will be appreciated by those skilled in the art that.
Above listed a series of detailed description is only illustrating for feasibility embodiment of the present invention; they are not to limit protection scope of the present invention, all disengaging within equivalent embodiment that skill spirit of the present invention does or change all should be included in protection scope of the present invention.
Claims (12)
1. a method that realizes the automatic deflection of frequency spectrum Doppler angle, is characterized in that, the method comprises the steps:
S1, the configuration a plurality of corresponding to the scanning angle A
1~ A
NUltrasonic scan line T
1~ T
N, and different sampling gate SV is set for the scanning line correspondence of different directions
1~ SV
N, wherein, N 〉=2;
S2, has the scanning angle A to tissue to be detected emission
1~ A
NUltrasonic scan line T
1~ T
N
S3, reception are corresponding to deflection angle A
1~ A
NReceived beam R
1~ R
N, and obtain N the corresponding echo data of deflection angle, and wherein, received beam R
1~ R
NThe corresponding sampling gate SV of difference
1~ SV
N
S4, to the sampling gate SV of N deflection angle
1~ SV
NEcho data do the fast Fourier transform that K is ordered on the pulse recurrence frequency territory, to obtain the blood flow frequency spectrum P on N direction
i(m), calculate the energy P of the blood flow frequency spectrum that obtains all directions
i, and with each energy P
iIn maximum P
maxCorresponding deflection angle is defined as the best angle of the required deflection of ultrasonic scan, wherein,
2. method according to claim 1, is characterized in that, described step S2 specifically comprises:
Obtain respectively ultrasonic scan line T
1~ T
NIn the left margin Bj of each root scanning line
L, right margin Bj
R, wherein, 1≤j≤N;
Determine the left margin B of the final broad beam that forms according to the left and right border of each scanning line that obtains
L, right margin B
R, wherein,
3. method according to claim 1, is characterized in that, the method also comprises:
Estimate the velocity amplitude of blood flow in tissue to be measured
, wherein,
Be the angle between launching beam vector and blood flow rate vector,
Be the angle between received beam vector and blood flow rate vector,
Be Doppler frequency shift,
Be tranmitting frequency.
4. method according to claim 2, is characterized in that, described step S2 also comprises:
Transmitting aperture M is configured to N sub-aperture, and different emission scanning angle of every corresponding configuration in sub-aperture.
5. method according to claim 4, is characterized in that, described step S2 also comprises:
Configure the second transmitting aperture Ms, wherein, Ms=k*M, 0＜k＜1;
Configure interior all primitives of described the second transmitting aperture Ms and work in the 0o transmit direction.
6. method according to claim 1, is characterized in that, described step S3 specifically comprises:
Configuring current scanning aperture is M, and the received beam number of work at present is P, wherein, and P 〉=N;
With the degree of depth at the place, center of 0o reference line sampling gate as starting point, according to the scanning angle A of internal engineering parameter configuration
1~ A
NThe reception scanning line R of different directions is set
1~ R
N, the reception line of different directions arranges different sampling gate SV;
Obtain respectively deflection angle A
1~ A
NCorresponding echo data, and calculate reception delay focusing with R
1~ R
NCentered by reference line.
7. a system that realizes the automatic deflection of frequency spectrum Doppler angle, is characterized in that, it comprises:
Dispensing unit, a plurality of corresponding to the scanning angle A for configuring
1~ A
NUltrasonic scan line T
1~ T
N, and different sampling gate SV is set for the scanning line correspondence of different directions
1~ SV
N, wherein, N 〉=2;
Emission controlling unit, be used for having the scanning angle A to tissue emission to be detected
1~ A
NUltrasonic scan line T
1~ T
N
Reception control unit, be used for to receive corresponding to deflection angle A
1~ A
NReceived beam R
1~ R
N, and obtain N the corresponding echo data of deflection angle, and wherein, received beam R
1~ R
NThe corresponding sampling gate SV of difference
1~ SV
N
The deflection decision package, be used for the sampling gate SV to N deflection angle
1~ SV
NEcho data do the fast Fourier transform that K is ordered on the pulse recurrence frequency territory, to obtain the blood flow frequency spectrum P on N direction
i(m), calculate the energy P of the blood flow frequency spectrum that obtains all directions
i, and with each energy P
iIn maximum P
maxCorresponding deflection angle is defined as the best angle of the required deflection of ultrasonic scan, wherein,
8. system according to claim 7, is characterized in that, described emission controlling unit specifically is used for:
Obtain respectively ultrasonic scan line T
1~ T
NIn the left margin Bj of each root scanning line
L, right margin Bj
R, wherein, 1≤j≤N;
Determine the left margin B of the final broad beam that forms according to the left and right border of each scanning line that obtains
L, right margin B
R, wherein,
9. system according to claim 7, is characterized in that, this system also is used for:
Estimate the velocity amplitude of blood flow in tissue to be measured
, wherein,
Be the angle between launching beam vector and blood flow rate vector,
Be the angle between received beam vector and blood flow rate vector,
Be Doppler frequency shift,
Be tranmitting frequency.
10. system according to claim 8, is characterized in that, described emission controlling unit also is used for:
Transmitting aperture M is configured to N sub-aperture, and different emission scanning angle of every corresponding configuration in sub-aperture.
11. system according to claim 10 is characterized in that, described emission controlling unit also is used for:
Configure the second transmitting aperture Ms, wherein, Ms=k*M, 0＜k＜1;
Configure interior all primitives of described the second transmitting aperture Ms and work in the 0o transmit direction.
12. system according to claim 7 is characterized in that, described reception control unit also is used for:
Configuring current scanning aperture is M, and the received beam number of work at present is P, wherein, and P 〉=N;
With the degree of depth at the place, center of 0o reference line sampling gate as starting point, according to the scanning angle A of internal engineering parameter configuration
1~ A
NThe reception scanning line R of different directions is set
1~ R
N, the reception line of different directions arranges different sampling gate SV;
Obtain respectively deflection angle A
1~ A
NCorresponding echo data, and calculate reception delay focusing with R
1~ R
NCentered by reference line.
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Cited By (9)
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| CN103330575A (en) * | 2013-06-27 | 2013-10-02 | 苏州边枫电子科技有限公司 | Blood-flow detecting device based on ultrasonic detection |
| CN105286920A (en) * | 2015-11-05 | 2016-02-03 | 无锡祥生医学影像有限责任公司 | Self-adaptation interference suppression method for ultrasonic Doppler information |
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