CN101900809B - Multi-beam synthesizing method capable of supporting deflection scanning and T-type scanning - Google Patents
Multi-beam synthesizing method capable of supporting deflection scanning and T-type scanning Download PDFInfo
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Abstract
The invention discloses a multi-beam synthesizing method capable of supporting deflection scanning and T-type scanning. A real-time delay parameter calculation unit used by the method is a universal delay parameter calculating device which can be universally applied to a convex array probe, a linear array probe and a phased array probe. The method supports regular convex, linear and phased array multi-beam scanning modes, convex and linear array deflection scanning modes and linear, dummy and convex array scanning modes. Both a scanning angle (or position) and a deflection angle of a beam are determined by two input parameters.
Description
Technical field
The present invention relates to a kind of multi-beam synthesis method, relate in particular to a kind of multi-beam synthesis method of supporting deflection scanning and T-shaped scanning, the method can be applied to various types of probes.
Background technology
Along with the development of ultrasonic diagnostic equipment has proposed more diversified scan mode requirement, need to change the scan deflection direction in original protruding battle array or linear array scanning mode basis such as spatial compound imaging, T-shaped (trapezoid) imaging need to realize empty protruding battle array scanning etc. with linear array probe.At the patent of having applied for " a kind of multi-beam synthesis method and device based in real time calculating of delay parameter and streamline " (number of patent application: 201010133657.7, Application No.: 12/793,698), multi-beam synthesis method (the number of patent application: 201010176005.7) of the in real time calculating of a kind of delay parameter and streamline, in a kind of multi-beam synthetic schemes was once proposed, can support protruding battle array, linear array and phased array probe to carry out multi-beam scanning.
Do not consider in the situation of deflection scanning geometric representation such as Fig. 1, Fig. 2 and shown in Figure 3 of protruding battle array, linear array and the scanning of phased array probe multi-beam.
Considering that sweep trace deflects in the situation of (steering), situation is different, such as Fig. 4, shown in Figure 5.
The virtual protruding battle array scan mode of linear array probe, as shown in Figure 6.
(application number: provide 201010133657.7), its basic structure as shown in Figure 7 in patent for the time-delay computing unit of the scan mode of support Fig. 1, Fig. 2 and Fig. 3.
Parameter X wherein, the configuration of Y and control signal C1 and C2 determine according to probe type and geometric parameter, and be as shown in table 1, and Y1, Y2, Y3, Y4 be corresponding different θ respectively
rValue (for protruding battle array and phased array) or Xr value (for linear array):
Table 1: the input parameter form of different probes
| Probe | X | Y | C1 | C2 | Remarks |
| Protruding battle array | R | 2Rcos(θ i-θ r) | 0 | 0 | K1＝(L+K2)，K2＝X |
| Linear array | 0 | (Xi-Xr) | 1 | 1 | K1＝-1，K2＝0 |
| Phased array | Xi | 2X icos(90°-θ r) | 0 | 1 | K1＝(L+K2)，K2＝0 |
The prior art scheme adopts the pipeline design, can four wave beam timesharing share same time-delay computing unit, is therefore realizing that hardware resource takies and greatly reduces in the synthetic situation of four wave beams.But this scheme does not have consideration to the support of deflection scanning, and in addition, different probes need to by the type of attachment of C1 and two control signal commutation circuits of C2, reach the support to dissimilar probes.
Summary of the invention
The present invention is improving design on the basis of the above, so that the multi-beam synthesizer can be supported the deflection scanning of convex array probe, linear array probe and phased array probe and support the needed scanning of T-shaped imaging that circuit structure is simplified greatly simultaneously.
The present invention solves the problems of the technologies described above the technical scheme that adopts to be:
A kind of multi-beam synthesis method of supporting deflection scanning and T-shaped scanning, it has a multi-beam synthesizer at least, a multi-beam synthesizer is accepted the ultrasonic echo of a passage, and the ultrasonic echo of a passage has the wave beam of M different scanning angle or scanning position, and it may further comprise the steps:
A. each multi-beam synthesizer writes two-port RAM or three port rams with the number of echoes word line set signal respectively;
B. according to the delay parameter that calculates M road wave beam in the same passage when array element parameter corresponding to prepass and focal position parameter timesharing, be converted into again the address of reading of RAM; The delay parameter computing formula is:
Time-delay table is shown:
Time-delay is converted into sampling pulse unit:
Input parameter form for the difference probe:
Wherein: l
i---convex array probe radius-of-curvature, L---focal length, the θ that be the sound path from array element i to focal point F, R
r---receive angle, the θ of line and aperture center emission line
i---angle, the x of i array element and aperture center emission line
i---spacing, the x at center, i array element central point range aperture
τ---linear array probe receives distance, the c of line and aperture center---velocity of sound, be approximately 1540m/s in tissue, Fs is sample frequency, and θ is deflection angle, H is the center of curvature height of the virtual protruding battle array of linear array, by scanning angle and the decision of probe width of virtual protruding battle array;
C. within the time of a write cycle time, from RAM, read in turn echo data through time-delay according to the address of reading that calculates, produce the time delayed signal output of M road;
D. the M road time delayed signal output timesharing that produces in the same passage passed through an interpolating unit and a weighted units;
E. first wave beam that all multi-beam synthesizers is produced is superposed to the first synthetic wave beam, and second wave beam that all multi-beam synthesizers are produced is superposed to the second synthetic wave beam,
……
M the wave beam that all multi-beam synthesizers are produced is superposed to the synthetic wave beam of M,
Finishing at same sum unit pipeline system of the wave beam overlap-add operation timesharing of an above-mentioned M wave beam;
F. the M road beam signal of output still passes past next stage sum unit or carries out the signal processing and the image processing in the mode of time-sharing multiplex.
The read frequency of described two-port RAM or three port rams is M times of write frequency.
Compare with the patent of invention of having applied for, this application has following advantages:
A) can support the deflection scanning of variety classes probe and the scanning of the virtual convex array probe of linear array probe.
B) use hardware resource still less.The used time-delay computing unit of the present invention only needs two multipliers, two additions (or subtraction) device, the computing of an extraction of square root.Compare original design and saved a multiplier, a totalizer.
Control simplyr, for any probe and deflection angle, do not need to switch hardware configuration by control signal.All switchings realize by changing input parameter X and Y fully.
Unique distinction of the present invention is to use hardware resource still less, simultaneously need not be according to probe or scan mode commutation circuit structure, and all define by input parameter X and Y.This is so that the form of whole scheme is more unified, implements also more succinctly, and used resource still less.
Description of drawings
Fig. 1 is the geometric representation of convex array probe multi-beam scanning;
Fig. 2 is linear array probe multi-beam scanning synoptic diagram;
Fig. 3 is phased array probe multi-beam scanning synoptic diagram;
Fig. 4 is the protruding battle array scanning synoptic diagram that deflection is arranged;
Fig. 5 is the linear array scanning synoptic diagram that deflection is arranged;
Fig. 6 is the scanning synoptic diagram of the virtual protruding battle array of linear array;
Fig. 7 is the four beam synthesizers time-delay computing unit synoptic diagram of original support zero deflection scanning;
Fig. 8 is the four beam synthesizers time-delay computing unit synoptic diagram that the embodiment of the invention is supported deflection scanning;
Fig. 9 is four beam synthesizer synoptic diagram of embodiment of the invention time-delay computing unit;
Figure 10 is that the embodiment of the invention is based on the ultrasonic image-forming system block diagram of four beam synthesizers of supporting deflection.
Embodiment
The below is described in further detail the present invention with embodiment with reference to the accompanying drawings:
By Fig. 1 to Fig. 6 as can be known, calculate focusing parameter and the most important thing is to calculate each array element to the sound path l of focus
iProvided linear array probe, convex array probe and the phased array probe sound path computing formula when multi-beam scans in the patent applied for, here emphasis provides the sound path computing formula of various probes in the deflection situation, and it is 0 special case that the scanning of zero deflection can be regarded deflection angle theta as.Can draw the sound path computing formula that following protruding battle array has deflection scanning according to Fig. 4:
Wherein
Can draw the sound path computing formula that following linear array probe has deflection scanning according to Fig. 5:
Can draw the sound path computing formula of the virtual protruding battle array scanning of following linear array according to Fig. 6:
X wherein
r=Htg θ
r, H is the height of the empty center of curvature in the formula, as shown in Figure 6.
From formula (1), (3) and (4) we can to obtain general formulae as follows:
(6) wherein the expression formula of X and Y is as follows according to probe type and scan mode different definition:
Table 2: the input parameter form of different probes and scan mode
Provide a kind of time-delay computing unit block diagram of four beam synthesizers of realizing according to formula (6) among Fig. 8.100 is the basic calculating part among the figure, according to pipeline work design, unit " T " the expression time-delay in 100, insert this unit purpose and be guarantee two branch datas synchronously.Unit 110 is used for latching the focal length parameter L, and the cycle of its latch signal L_load is four times of calc_clk, to guarantee that for each L value each calculates once time-delay to four wave beams respectively. Shift register 120 and 130 is used in turn to the parameter of four wave beams, and (X1, Y1), (X2, Y2), (X3, Y3), (X4, Y4) switches.Make four wave beam time-sharing multiplex time-delay computing units.Because shift clock calc_clk is identical with the major clock of computing unit 100, frequency all is four times of L_load, therefore can corresponding each L value, so that time-delay computing unit 100 is respectively to input parameter (X1, Y1), (X2, Y2), (X3, Y3), (X4, Y4) does once and calculates, produce four different delayed time values, the time-delay of respectively corresponding four wave beams.Unit 140 and 150 is the alternative Port Multiplier, as x_load and y_load when being high, Port Multiplier is with the data of the data shift register of packing into, to realize the renewal of X and Y value, when x_load and y_load when low, ring shift is realized in unit 120 and 130, and X and Y switch between the input parameter of four wave beams.
Fig. 9 has provided the block diagram of four beam synthesizers of an application drawing 8.In the figure, 100 pairs of sampling pulses of ripple counter are counted, and have recorded the distance that ultrasound wave is advanced, so be called ripple counter.The output of ripple counter is as the writing address of dual port RAM 200.Because that as long as the capacity of dual port RAM holds the maximum address that writes and read is poor just much of that, so the capacity of general dual port RAM only need get 256 to 512.Writing address and read address auto-folder when count to the end and arrive starting point is equivalent to an annular storage queue.Here our degree of depth of getting RAM is 512, so the write address of dual port RAM 200 only need to connect low 9 of ripple counter 100.The echo data rf_datai of i road input according to writing address continuous write dual port RAM 200.The output L of ripple counter is driven into delay parameter computing unit 300 simultaneously as the expression of the degree of depth.Delay unit is being squeezed under the pulse L_load effect, with the expression focal length amount L squeeze into, the frequency of L_load be the delay parameter computing unit clock calc_clk 1/4th.Also namely under same focal length L, respectively the time-delay of four wave beams is calculated once.The input of time-delay computing unit comprises X_load, Y_load, data and start, before a sweep trace begins, X_load and Y_load are with the parameter (X1, Y1) of four wave beams, (X2, Y2), (X3, Y3), (X4, Y4) the delay parameter computing unit of packing into, start signal effectively represent the synthetic beginning of wave beam.The input parameter of four wave beams switches under calc_clk control in turn, delay parameter computing unit 300 calculates the delay parameter of each wave beam with pipeline system, delay parameter is squeezed into the register group 330 of back in turn, and each register is expressed as respectively delay1-delay4.2-4 code translator 320 decoding beam_sel, four tunnel control outputs of generation are selected delay1-delay4.The value of delay1-delay4 is latched into latch 340 by last negative edge of squeezing into pulse, and purpose is to remain unchanged in the cycle a focal length variations for the value that keeps delay1-delay4.The value Input Address computing unit 350 of delay1-delay4 calculates corresponding RAM in conjunction with focal length L and reads the address.Within a write cycle, address calculation 350 must be calculated each wave beam respectively and read the address once, and reads data from dual port RAM.Therefore, the frequency of read pulse rd_clk is four times of write pulse wr_clk.If wr_clk is 40MHz, then rd_clk is 160MHz.Squeezed in turn register 210 to 240 from the data that dual port RAM 200 is read.Because the needs of interpolation have also kept historical data in register 250 to 280.The historical data that keeps is not limited to only have two-stage.Exponent number according to interpolation algorithm is different, can keep multistage.Such as 6 rank interpolation, keep 6 continuous output data.The data communication device of reading is crossed interpolation and the weighted units 500 that 4-1 Port Multiplier 400 outputs to pipeline system.The interpolation coefficient of interpolation weighted units is provided by address calculation 350.What weighted data wt can calculate arrives, also can calculated in advance good, is stored in the external storage, reads in from external storage in real time in the reception process.Because it is very fast that the variation of weighted value does not need, change 64 times such as the sweep trace of 25cm, therefore, preserve weighted value and can't take too many storage resources.From interpolation weighted calculation unit 500 data out be through time-delay and four wave beam echo datas of time-sharing multiplex.These data are sent to sum unit 600 with pipeline system work, and the output of other N-1 unit sues for peace together, obtain at last the four beam data output of time-sharing multiplex.
Figure 10 has provided a B ultrasonic system chart based on four beam synthesizers of supporting deflection.Array energy transducer 10 among the figure is 128 array elements.Beam synthesizer 60 1 has 64 passages.Emission has the pulse signal of time-delay to radiating circuit 50 to specific one group of array element (be called and activate array element) under the control of controller 70, to realize focusing on emission.The gating that activates the echoed signal process analog switch 20 of array element is sent to T/R switch 30.The effect of T/R switch 30 is that the high-voltage signal of isolation emission avoids causing the amplifying circuit saturation jamming of back.Be sent to analog front circuit 40 through the simulating signal of T/R switch 30 and amplify and process, AFE (analog front end) has comprised prime amplifier, temporal gain control amplifier (TGC) and adc circuit.Be converted to digital signal through amplifying signal and be sent to beam synthesizer 60.Beam synthesizer is one and has comprised 64 tunnel as shown in Figure 9 circuit structures.Beam synthesizer 60 is delayed time 64 road input signals.Four tunnel beam data through time-delay are exported on each road, and four circuit-switched data are sent to sum unit 61 with the form of time-division multiplex.Sum unit 61 is synthesized four tunnel beam data with pipeline system.Beam data after its four of being output as time-division multiplex synthesize.This data stream branches into four the tunnel through divider (DEMUX) 80.Be sent to respectively four tunnel quadrature demodulation unit 81 to 84 and signal processing unit 85 to 89.Four sweep traces that form are at last given digital scan converter (DSC) 90.Digital scan converter 90 is converted to the raster data with rectangular coordinate with scan-line data, and is sent to image buffer memory 92 by read-write controller 91.Under the control of controller 70, notice host computer 73 is by pci bus reads image data and demonstration.The control data are also by passing to controller 70 under the pci bus.The parameter that is used for focusing time-delay calculating is stored in parameter storage 71.Before each scanning beginning, controller 70 is sent to the synthetic passage of each wave beam with all parameters, and sends synthetic the carrying out of the whole wave beam of control sequential control.With the example among Figure 14, can keep under the nondecreasing condition of image line density, the frame frequency of B ultrasonic system is improved 4 times.This will improve B ultrasonic greatly for the image quality of locomotive organ in the human body such as heart, simultaneously because this device is supported deflection scanning, can be used for the senior scan patterns such as the deflection of spatial compound imaging, blood flow scanning direction and T-shaped scanning.
Those skilled in the art do not break away from essence of the present invention and spirit, can there be the various deformation scheme to realize the present invention, the above only is the better feasible embodiment of the present invention, be not so limit to interest field of the present invention, the equivalent structure that all utilizations instructions of the present invention and accompanying drawing content are done changes, and all is contained within the interest field of the present invention.
Claims (2)
1. multi-beam synthesis method of supporting deflection scanning and T-shaped scanning, it has a multi-beam synthesizer at least, a multi-beam synthesizer is accepted the ultrasonic echo of a passage, the ultrasonic echo of a passage has the wave beam of M different scanning angle or scanning position, it is characterized in that may further comprise the steps:
A. each multi-beam synthesizer writes two-port RAM or three port rams with the number of echoes word line set signal respectively;
B. according to the delay parameter that calculates M road wave beam in the same passage when array element parameter corresponding to prepass and focal position parameter timesharing, be converted into again the address of reading of RAM; The delay parameter computing formula is:
Time-delay table is shown:
Time-delay is converted into sampling pulse unit:
Wherein: X and Y for the input form of different probes and scan mode are:
During protruding battle array deflection scanning, X is d
i, Y is
During the linear array deflection scanning, X is (x
i-x
r), Y is 2 (x
i-x
r) (1+sin θ),
During phase-array scanning, X is x
i, Y is 2x
i(1+sin θ
r),
During the T-shaped scanning of linear array, X is (x
i-x
r), Y is 2 (x
i-x
r) (1+sin θ
r), x
r=Htg θ
r,
C. within the time of a write cycle time, from RAM, read in turn echo data through time-delay according to the address of reading that calculates, produce the time delayed signal output of M road;
D. the M road time delayed signal output timesharing that produces in the same passage passed through an interpolating unit and a weighted units;
E. first wave beam that all multi-beam synthesizers is produced is superposed to the first synthetic wave beam,
Second wave beam that all multi-beam synthesizers are produced is superposed to the second synthetic wave beam,
Until M the wave beam that all multi-beam synthesizers are produced is superposed to the synthetic wave beam of M,
Finishing at same sum unit pipeline system of the wave beam overlap-add operation timesharing of an above-mentioned M wave beam;
F. the M road beam signal of output still passes past next stage sum unit or carries out the signal processing and the image processing in the mode of time-sharing multiplex.
2. a kind of multi-beam synthesis method of supporting deflection scanning and T-shaped scanning according to claim 1 is characterized in that: the read frequency of described two-port RAM or three port rams be write frequency M doubly.
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| CN106443680B (en) * | 2016-09-13 | 2018-12-07 | 哈尔滨工程大学 | A kind of ultrasound convolution deflection generation method based on frequency control |
| CN109805960A (en) * | 2019-02-22 | 2019-05-28 | 无锡海斯凯尔医学技术有限公司 | Method, apparatus, equipment and the storage medium that data are transmitted in ultrasonic imaging |
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| JP2005140639A (en) * | 2003-11-06 | 2005-06-02 | Mitsubishi Electric Corp | Distributed aperture radar system |
| CN101194846A (en) * | 2006-12-07 | 2008-06-11 | 深圳迈瑞生物医疗电子股份有限公司 | Beam synthesizing method and device for time division multiplex |
| US7548215B2 (en) * | 2007-07-09 | 2009-06-16 | Wistron Neweb Corporation | Multi-beam-reflector dish antenna system and method for production thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2005140639A (en) * | 2003-11-06 | 2005-06-02 | Mitsubishi Electric Corp | Distributed aperture radar system |
| CN101194846A (en) * | 2006-12-07 | 2008-06-11 | 深圳迈瑞生物医疗电子股份有限公司 | Beam synthesizing method and device for time division multiplex |
| US7548215B2 (en) * | 2007-07-09 | 2009-06-16 | Wistron Neweb Corporation | Multi-beam-reflector dish antenna system and method for production thereof |
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