CN101683276A - Doppler signal gap filling method, device and ultrasound imaging system - Google Patents
Doppler signal gap filling method, device and ultrasound imaging system Download PDFInfo
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Abstract
The invention discloses a Doppler signal gap filling method, device and ultrasound imaging system comprising the device. The method mainly includes a search step and a mapping step. According to the Doppler signal gap filling method, device and ultrasound imaging system comprising the device of the embodiment of the invention, the filled Doppler signal can be ensured to have no phase mutation, theDoppler signal is more continuous, and Doppler imaging quality in synchronous display is improved. In addition, the gap is filled by front and back data symmetrical mapping, and one signal is negatedto ensure orthogonality of data, thus eliminating mirror image produced in filling.
Description
Technical field
The present invention relates to a kind of Doppler signal gap filling method and device that is used for the multi-mode ultrasonic image-forming system, and the ultrasonic image-forming system that comprises this device.
Background technology
Modern medical ultrasound imaging diagnostic system is integrated a plurality of imaging patterns usually, shows multiple content measurement simultaneously, such as can showing two-dimentional Type B image and Doppler frequency spectrum figure simultaneously, or shows Doppler frequency spectrum figure and color blood-stream image synchronously, so that diagnosis.Yet Doppler scanning can be interrupted by Type B or color flow angiography scanning midway in this system, causes loss of data, forms the gap, causes the spectrum misjudgment, and Doppler's audio discontinuity.
Figure 1 shows that the DOPPLER ULTRASOUND SIGNAL processing system.Ultrasound echo signal forms rf echo signal after wave beam is synthetic, resolve into two paths of signals through demodulation module again: phase component I (In-phase component) signal and quadrature component Q (quadrate component) signal.Then, in the continuous wave Doppler system, this I, Q two paths of signals directly enter the wall filtering processing links; This I, Q two-way component promptly add up in certain period of time respectively through range gating in the impulse wave doppler system, and this add up time period and pulse Doppler transmitted pulse are all selected according to practical situation by the operator, enter the wall filtering processing links again.Described wall filtering is a high pass filter, can filtering by clutter static or that the microinching tissue causes.I, Q two paths of signals after this link is handled consist predominantly of the kinetic echo of erythrocyte, are sent to the power Spectral Estimation module, and this module generally adopts fast Fourier transform (FFT) to come the estimated power spectrum.Because the power spectrum dynamic range that estimates is too big, need handle through overcompression, to be compressed to the gray scale indication range.What the last Doppler frequency spectrum figure that shows on screen represented is certain moment, certain speed, i.e. the power spectrum intensity of certain frequency shift (FS).System can also comprise automatic envelope detected module, and the data after the spectrum compression are analyzed, and with from motion tracking blood stream peaks speed and average speed over time, and shows in real time on Doppler frequency spectrum figure.In addition, I, Q two paths of signals behind the described process wall filtering can also be sent to the acoustic processing module, with formation positive blood flow and inverse blood flow two-way voice data, and are sent to speaker respectively after the D/A module converts, produce forward and inverse blood flow sound.
When doppler imaging showed simultaneously synchronously with Type B or color blood-stream image, ultrasonic system generally adopted the mode of switching fast between two-dimentional B-scan and Doppler scanning to realize.But this mode can produce following shortcoming; When carrying out B image scanning, Doppler signal is lost because Doppler scanning interrupts, and forms the gap, occurs discontinuous on Doppler frequency spectrum figure and Doppler's sound.
As shown in Figure 2, solid line is represented non-gap Doppler scanning, and dotted line is represented the B scanning of off time.In off time, there is not Doppler signal, carry out conventional Doppler signal this moment and handle, can cause the interrupted of Doppler spectrogram, Doppler's sound also can interrupt simultaneously.Therefore in the ultrasonic synchronous display system of multi-mode, general adopt the method that the gap is filled to remedy because Doppler spectrogram that the gap causes or sound vision and acoustically discontinuous.
According to a kind of prior art, adopt tensile method to fill gap in the Doppler frequency spectrum, every the frequency spectrum that calculates in the time of just will be near the gap repeats to show fills the gap twice.The Doppler signal that employing directly repeats during the non-gap is filled the gap, and is more satisfactory to the filling effect of sound, acoustically imperceptible interruption; But, not ideal to the visual effect that Doppler frequency spectrum figure fills.When Doppler frequency spectrum figure was more or less the same before and after the gap, effect can be quite a lot of.But when differing big, adopt tensile method to see tangible sudden change in tensile junction for Doppler frequency spectrum figure before and after the gap.
According to another kind of prior art, the data that a kind of method of utilizing autoregression model and interpolation is estimated gap location have been proposed, carry out the gap from the angle of time domain and fill, and then carry out sound spectrogram and Doppler's sound calculates.But this method is difficult to guarantee the orthogonality of filling back, gap I, Q two paths of data, thereby makes spectrogram produce mirror image.In addition, the exponent number of autoregression model is set the influence of gap filling effect very big, is easy to produce not astringent situation.
Summary of the invention
The objective of the invention is in order to overcome the defective that prior art exists, a kind of Doppler signal gap filling method and device are provided, it can guarantee the seriality of gap and non-gap location signal phase, thereby improve the accuracy that spectrum is estimated, make Doppler's spectrogram and Doppler's sound more continuous, show when realizing multi-mode ultrasonic system doppler imaging and two-dimensional imaging.
According to the first aspect of the embodiment of the invention, a kind of Doppler signal gap filling method is provided, comprising: search step is used to search for the forward and backward peak of Doppler signal gap; And mapping step, be the mapping center with the forward and backward peak in the gap of being searched for, respectively the forward and backward Doppler signal in gap is carried out forward direction and back to symmetrical mapping; Wherein utilize the leading portion in the Doppler signal filling gap of forward direction symmetrical mapping, utilize the back to fill the back segment in gap to the Doppler signal of symmetrical mapping.
According to the second aspect of the embodiment of the invention, a kind of Doppler signal gap filling device is provided, comprising: search module is used to search for the forward and backward peak of Doppler signal gap; And mapping block, be the mapping center with the forward and backward peak in the gap of being searched for, respectively the forward and backward Doppler signal in gap is carried out forward direction and back to symmetrical mapping; Wherein utilize the leading portion in the Doppler signal filling gap of forward direction symmetrical mapping, utilize the back to fill the back segment in gap to the Doppler signal of symmetrical mapping.
According to the third aspect of the embodiment of the invention, a kind of ultrasonic image-forming system is provided, comprise Doppler signal gap filling device according to embodiment of the invention second aspect.
Employing is according to the Doppler signal gap filling method and the device of the embodiment of the invention and the ultrasonic image-forming system that comprises this device, Doppler signal phase place after can guaranteeing to fill is sudden change not, make Doppler signal more continuous, improve the doppler imaging quality when showing synchronously.In addition, fill the gap, and one road signal negate has wherein been eliminated and filled the mirror image that produces to guarantee the orthogonality of signal by the method for the forward and backward signal symmetry in gap mapping.
Below in conjunction with accompanying drawing and by specific embodiment the present invention is further specified.
Description of drawings
Fig. 1 is that DOPPLER ULTRASOUND SIGNAL of the prior art is handled block diagram;
Fig. 2 is the multiple mode scanning sketch map;
Fig. 3 is the Doppler signal gap filling method flow chart according to the embodiment of the invention;
Fig. 4 fills sketch map according to the Doppler signal gap of the embodiment of the invention;
Fig. 5 is the symmetrical mapping sketch map, and wherein (a) is the sketch map that directly overturns, and (b) is peak value upset sketch map;
Fig. 6 is the peak value searching sketch map according to the embodiment of the invention;
Fig. 7 is the Doppler signal gap filling device block diagram according to the embodiment of the invention;
Fig. 8 is the partial block diagram according to the ultrasonic image-forming system that comprises the Doppler signal gap filling device of the embodiment of the invention.
The specific embodiment
As shown in Figure 3, the Doppler signal gap filling method according to present embodiment mainly comprises search step 302 and mapping step 304.Wherein search step 302 is used to search for the forward and backward peak of Doppler signal gap; In mapping step 304, be the mapping center with the forward and backward peak in the gap of being searched for, respectively the forward and backward Doppler signal in gap is carried out forward direction and back to symmetrical mapping; Wherein utilize the leading portion in the Doppler signal filling gap of forward direction symmetrical mapping, utilize the back to fill the back segment in gap to the Doppler signal of symmetrical mapping.
In addition, the Doppler signal gap filling method according to present embodiment also comprises correction step 300, weighting step 306 and filter step 308 alternatively.Wherein revising step 300 is used for shortening the transient response time of the Doppler signal before filling by initialization wall filter, forward and reverse filtering or recurrence filtering; Weighting step 306 is used for stitching position forward and backward filling signal in gap is weighted processing, so that Doppler signal keeps continuously; Filter step 308 is used for the Doppler signal after filling is carried out conventional wall filtering.
Below to being elaborated according to each step in the method for present embodiment.Overall thought according to the method for present embodiment is: at first shorten the wall filtering transient effect by the initialization wall filter, by being carried out the gap, the data symmetrical mapping before and after the gap fills then, continuous for guaranteeing the gap data phase place, the nearest peak point that the symmetrical mapping center selects for use the single channel data peaks search of front and back, gap to find, and to another circuit-switched data symmetrical mapping negate to guarantee orthogonality, handle to guarantee the seriality of crossover position by weighting simultaneously.
Echo data after the reception (being signal) after the synthetic and quadrature demodulation, obtains I road and Q circuit-switched data through wave beam.At first, I road and Q circuit-switched data being carried out wall filtering handles with filtering by clutter static or that the microinching tissue causes.Especially, be different from the wall filtering of conventional Doppler signal in handling, the wave filter when fill in the gap need carry out initialization process, and its reason is that all can there be the transient response of a period of time in any one wave filter, i.e. the initial one piece of data of filtering is invalid.And under the multimode operation situation, the filtering in each intersegmental crack, all can bring the gap after one piece of data be in wave filter transient response position, thereby cause data invalid.In this case, wave filter transient response time segment data can not participate in calculating as valid data, must be rejected, otherwise can cause bigger error.Like this, the doppler data gap has just comprised because gap that other mode scanning cause and because the gap that wall filtering transient response causes.When wall filtering adopted I IR wave filter, transient response time can reach tens times of iir filter exponent number, thereby the caused gap of wall filtering transient response is very big.For shortening the length of invalid data, need necessarily revise wall filter and shorten transient response time.The method that shortens transient response can be the initialization wave filter, also can be forward and reverse filtering, returns methods such as filtering.Like this, according to the continuous-wave doppler scanning times of default and off time length, design suitable wall filtering initializer with shortening wave filter transient effect, thereby reduce the length of invalid data, also just shortened the gap that causes because of wall filtering transient response.
Subsequently, filtered data are begun to carry out the gap fill, fill sketch map as shown in Figure 4.Wherein Doppler scanning is interrupted by B scanning, and whole gap length L is made of gap length L1 and the caused gap L 2 of wall filtering transient response that B scanning causes.What fill to adopt in the gap is the mode of symmetrical mapping, promptly the data before the gap is overturn and fills before the gap half section, the data after the gap is overturn fill the gap second half section.In order to guarantee to fill the seriality of phase place, the present embodiment peak (i.e. first peak) nearest to filtered The data is as the symmetrical mapping center, can certainly adopt second, third peak etc., but preferentially be to adopt first peak.Fig. 5 has provided the sketch map of two kinds of symmetrical mapping, therefrom as can be seen, direct symmetrical mapping method phase place shown in Fig. 5 a exists very big saltus step, there is big phase shift in whole simultaneously back segment data, compose raising of broadening that estimation can cause main lobe and secondary lobe so again, and the method in peak place symmetrical mapping shown in Fig. 5 b can guarantee the seriality of its splice point position and follow-up data phase place, thereby guarantees the accuracy that spectrum is estimated.
Like this, filtered data are at first delivered to the peak value searching link, to each interstitial site, search for nearest signal peak position M1 forward, search for nearest signal peak position M2 backward.The method of data shown in Figure 6 being carried out peak value searching is to treat search data to carry out difference processing, and the adjacent data symbol is identical after the difference counts peak, and promptly the point of Fig. 6 fullness in the epigastrium and abdomen foot formula is thought peak point:
(X
n-X
n-m)(X
n-X
n+m)＞0，
Wherein, the exponent number of difference can 1 or 2, for guaranteeing the stability of algorithm, generally elect 2 as.In addition, be the stability of assurance algorithm, and do not search local peaking, can carry out carrying out peak value searching again after the low-pass filtering data.
Aforesaid peak value searching method can be to I road or the independent search of Q circuit-switched data, also can make two-way search for the back simultaneously and seek minima.Specifically, under the situation of roving commission,, and carry out symmetrical mapping and filling to the in-phase component signal that obtains by quadrature demodulation and the forward and backward peak of wherein one tunnel search Doppler signal gap of orthogonal component signal; Another road signal in in-phase component signal and the orthogonal component signal is also filled after the negate for the mapping of symmetrical mapping centrosymmetry with the correspondence position.And when the in-phase component signal that obtains by quadrature demodulation and orthogonal component signal searched for the forward and backward peak of Doppler signal gap simultaneously, get peak wherein apart from nearest a road the shining upon and fill in gap, another road with the correspondence position for filling after mapping of symmetrical mapping centrosymmetry and the negate.It should be noted that, because the orthogonality of two paths of data, the peak value of one circuit-switched data is that another circuit-switched data phase place is 0 position just, therefore, after a circuit-switched data peak symmetrical mapping, another circuit-switched data should be carried out the negate processing again to guarantee the orthogonality of its seriality and two paths of data after getting symmetrical mapping.
As shown in Figure 4, S0 is the doppler data before and after the gap, and S0 ' is forward direction symmetrical mapping data, is used to fill the gap leading portion, S0 " be back to the symmetrical mapping data, be used to fill the gap back segment.At this moment, if there is little deviation in the peak value estimation, the time period that may begin and finish in the gap, there is the doppler data non-continuous event, simultaneously, also can there be the discontinuous phenomenon of doppler data in the stitching position of data before and after the stage casing, gap.Continuous for guaranteeing these phase places of filling the discontinuous position of splice point, can adopt weighting to handle and make it continuously level and smooth.For example, make the preceding doppler data of discontinuity point converge to zero progressively, the doppler data behind the discontinuity point begins to increase by zero progressively, thereby can keep the seriality of doppler data.Shown in Fig. 4 lower middle portion, doppler data before and after three stitching positions is handled with the window function weighting respectively, make doppler data be able to keep continuously at this, window function is chosen as Hanning window etc.
Data after weighting is filled are delivered to conventional wall filtering link and are carried out a low frequency component filtering again, deliver to links such as spectrum estimation and acoustic processing then, and these contents are not at this repeated description.
In the ultra sonic imaging diagnostic system that adopts this method, concrete implementation step may be summarized as follows:
1. gap length reasonable in design and ratio are launched the synthetic processing of reception and wave beam accordingly, and I is obtained in quadrature demodulation, and the Q two-way receives data.
2. according to systematic parameter design initialization wall filter, carry out wall filtering by the gap piecemeal and handle.
3. to an interstitial site, data first peak M1 and M2 before and after one tunnel gap among Searching I, the Q.
4. this circuit-switched data of peak value searching is carried out symmetrical mapping, and the symmetrical mapping of another circuit-switched data is carried out negate.
5. weighting is handled to gap splicing crossover position, obtains to fill the result.
6. the data after filling are carried out once conventional wall filtering, deliver to modules such as follow-up spectrum estimation.
As above provide multi-mode ultrasonic system doppler data gap and filled overall process, this method can effectively be improved the gap that causes because of signal interruption, make Doppler signal more continuous, according to filling the signal processing that the successive Doppler signal in back further carries out, can make Doppler frequency spectrum figure and Doppler's sound more continuous, improve the doppler imaging quality when showing synchronously, thereby support the multi-mode ultrasonic scanning system to realize synchronous demonstration at lower cost.
As shown in Figure 7, the Doppler signal gap filling device according to present embodiment mainly comprises search module 702 and mapping block 704.Wherein search module 702 is used to search for the forward and backward peak of Doppler signal gap; In mapping block 704, be the mapping center with the forward and backward peak in the gap of being searched for, respectively the forward and backward Doppler signal in gap is carried out forward direction and back to symmetrical mapping; Wherein utilize the leading portion in the Doppler signal filling gap of forward direction symmetrical mapping, utilize the back to fill the back segment in gap to the Doppler signal of symmetrical mapping.
In addition, the Doppler signal gap filling method according to present embodiment also comprises correcting module 700, weighting block 706 and filtration module 708 alternatively.Wherein correcting module 700 is used for by initialization wall filter, forward and reverse filtering or returns filtering, shortens the transient response time of the Doppler signal before filling; Weighting block 706 is used for stitching position forward and backward filling signal in gap is weighted processing, so that Doppler signal keeps continuously; Filtration module 708 is used for the Doppler signal after filling is carried out conventional wall filtering.
Fig. 8 is the partial block diagram that comprises according to the ultra sonic imaging diagnostic system of the Doppler signal gap filling device of embodiment.Ultrasound echo signal resolves into I and Q two paths of signals through wave beam after the synthetic and quadrature demodulation, by the initialization wave filter (also can be forward and reverse filtering, return filtering etc.) I and Q two paths of signals are carried out the wall filtering processing, then enter search module, mapping block, weighting block and filtration module and carry out the gap filling.Then, the signal of filling is further handled.
More than describe the present invention by specific embodiment, but the present invention is not limited to these specific embodiments.The present invention not only can be used for doppler imaging and Type B or color blood-stream image synchronous display system simultaneously, also can be used for Type B, C type and three kinds of imaging patterns of Doppler display system simultaneously.It will be understood by those skilled in the art that and can also make various modifications to the present invention, be equal to replacement, change or the like, still, as long as do not deviate from spirit of the present invention, all should be within protection scope of the present invention.
Claims (20)
1. a Doppler signal gap filling method is characterized in that, comprising:
Search step is used to search for the forward and backward peak of Doppler signal gap; And
Mapping step is the mapping center with the forward and backward peak in the gap of being searched for, and respectively the forward and backward Doppler signal in gap is carried out forward direction and back to symmetrical mapping;
Wherein utilize the leading portion in the Doppler signal filling gap of forward direction symmetrical mapping, utilize the back to fill the back segment in gap to the Doppler signal of symmetrical mapping.
2. Doppler signal gap filling method as claimed in claim 1 is characterized in that, also comprises:
The weighting step is used for stitching position forward and backward filling signal in gap is weighted processing, so that the Doppler signal of filling keeps continuously.
3. Doppler signal gap filling method as claimed in claim 2, it is characterized in that: by making the Doppler signal asymptotic convergence of filling before the stitching position of gap to zero, the Doppler signal of filling after the stitching position of gap keeps Doppler signal continuous by zero progressive increase.
4. Doppler signal gap filling method as claimed in claim 2 is characterized in that: use window function that stitching position forward and backward signal in gap is weighted processing.
5. Doppler signal gap filling method as claimed in claim 1 is characterized in that, also comprises:
Revise step, be used for shortening the transient response time of the Doppler signal before filling by initialization wall filter, forward and reverse filtering or recurrence filtering.
6. Doppler signal gap filling method as claimed in claim 1 is characterized in that, also comprises:
Filter step is used for the Doppler signal after filling is carried out conventional wall filtering.
7. as each described Doppler signal gap filling method in the claim 1 to 6, it is characterized in that: in described search step, the Doppler signal forward and backward to the gap carries out difference processing respectively, and the position that the adjacent data symbol is identical after the difference is defined as peak.
8. as each described Doppler signal gap filling method in the claim 1 to 6, it is characterized in that:, and carry out symmetrical mapping and filling the in-phase component signal that obtains by quadrature demodulation and the forward and backward peak of wherein one tunnel search Doppler signal gap of orthogonal component signal; Another road signal in in-phase component signal and the orthogonal component signal is also filled after the negate for the mapping of symmetrical mapping centrosymmetry with the correspondence position.
9. as each described Doppler signal gap filling method in the claim 1 to 6, it is characterized in that: the in-phase component signal and the orthogonal component signal that obtain by quadrature demodulation are searched for the forward and backward peak of Doppler signal gap simultaneously, and get peak wherein apart from nearest a road the shining upon and fill in gap, another road with the correspondence position for filling after mapping of symmetrical mapping centrosymmetry and the negate.
10. as each described Doppler signal gap filling method in the claim 1 to 6, it is characterized in that: first forward and backward peak of search Doppler signal gap in search step.
11. a Doppler signal gap filling device is characterized in that, comprising:
Search module is used to search for the forward and backward peak of Doppler signal gap; And
Mapping block is the mapping center with the forward and backward peak in the gap of being searched for, and respectively the forward and backward Doppler signal in gap is carried out forward direction and back to symmetrical mapping;
Wherein utilize the leading portion in the Doppler signal filling gap of forward direction symmetrical mapping, utilize the back to fill the back segment in gap to the Doppler signal of symmetrical mapping.
12. Doppler signal gap filling device as claimed in claim 11 is characterized in that, also comprises:
Weighting block is used for stitching position forward and backward filling signal in gap is weighted processing, so that the Doppler signal of filling keeps continuously.
13. Doppler signal gap filling device as claimed in claim 12, it is characterized in that: described weighting block is by making the Doppler signal asymptotic convergence of filling before the stitching position of gap to zero, the Doppler signal of filling after the stitching position of gap keeps Doppler signal continuous by zero progressive increase.
14. Doppler signal gap filling device as claimed in claim 12 is characterized in that: described weighting block uses window function that stitching position forward and backward filling signal in gap is weighted processing.
15. Doppler signal gap filling device as claimed in claim 11 is characterized in that, also comprises:
Correcting module is used for shortening the transient response time of the Doppler signal before filling by initialization wall filter, forward and reverse filtering or recurrence filtering.
16. Doppler signal gap filling device as claimed in claim 11 is characterized in that, also comprises:
Filtration module is used for the Doppler signal after filling is carried out conventional wall filtering.
17. as each described Doppler signal gap filling device in the claim 11 to 16, it is characterized in that: described search module carries out difference processing respectively to the forward and backward Doppler signal in gap, and the position that the adjacent data symbol is identical after the difference is defined as peak.
18. as each described Doppler signal gap filling device in the claim 11 to 16, it is characterized in that:, and carry out symmetrical mapping and filling the in-phase component signal that obtains by quadrature demodulation and the forward and backward peak of wherein one tunnel search Doppler signal gap of orthogonal component signal; Another road signal in in-phase component signal and the orthogonal component signal is also filled after the negate for the mapping of symmetrical mapping centrosymmetry with the correspondence position.
19. as each described Doppler signal gap filling device in the claim 11 to 16, it is characterized in that: described search step module is searched for the forward and backward peak of Doppler signal gap simultaneously to the in-phase component signal and the orthogonal component signal that obtain by quadrature demodulation, and get peak wherein apart from nearest a road the shining upon and fill in gap, another road with the correspondence position for filling after mapping of symmetrical mapping centrosymmetry and the negate.
20. a ultrasonic image-forming system is characterized in that, comprises one of them described Doppler signal gap filling device of claim 10 to 18.
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Application publication date: 20100331 Assignee: Shenzhen Mindray Animal Medical Technology Co.,Ltd. Assignor: SHENZHEN MINDRAY BIO-MEDICAL ELECTRONICS Co.,Ltd. Contract record no.: X2022440020009 Denomination of invention: Doppler signal gap filling method and device and ultrasonic imaging system Granted publication date: 20130424 License type: Common License Record date: 20220804 |
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