CN103913747A - Multichannel-scanning-time-delay calculating method and device - Google Patents

Multichannel-scanning-time-delay calculating method and device Download PDF

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Publication number
CN103913747A
CN103913747A CN201210591344.5A CN201210591344A CN103913747A CN 103913747 A CN103913747 A CN 103913747A CN 201210591344 A CN201210591344 A CN 201210591344A CN 103913747 A CN103913747 A CN 103913747A
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Prior art keywords
delay
point
reference point
time
sweep trace
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李小雪
王勇
张羽
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Shenzhen Landwind Industry Co Ltd
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Shenzhen Landwind Industry Co Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
    • G01S15/88—Sonar systems specially adapted for specific applications
    • G01S15/89—Sonar systems specially adapted for specific applications for mapping or imaging
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/52—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00
    • G01S7/52015—Diversity systems

Abstract

The invention discloses a multichannel-scanning-time-delay calculating method and device. The method includes the following steps: using any point on an array-element surface as a reference point and calculating position parameters of each array element center point and scanning line start point in channels, relative to the reference point; calculating a distance dn of each array element center point to a focal point on each scanning line; and calculating a quantized delay time tn from the focal point F on each scanning line to each channel. The multichannel-scanning-time-delay calculating method and device improve the focusing precision so that the quality of fundamental-wave images can be improved and artifacts under harmonic waves can be eliminated and real-time operation quantity in time-delay calculation is reduced and thus resources can be saved.

Description

Hyperchannel sweep delay computing method and device
Technical field
The present invention relates to ultrasonic imaging control technology, especially relate to a kind of hyperchannel sweep delay computing method and device.
Background technology
Ultrasonic imaging is multiple passage transmittings, receives, and in order to improve the signal to noise ratio (S/N ratio) of signal and the resolution of imaging, needs the cophase stacking of multiple signals, namely focuses on.In a linear transducer array, the array element that each passage is corresponding arrives the space length difference of same focus, reach the cophase stacking at focus place, just need to control accordingly the transmitting of each passage, reception signal.
In ultrasonic system, except CW scan pattern, be all hyperacoustic with impulse form transmitting, need to be to different passages with different transmittings, receive the start time and realize focusing, namely do not gone the same way signal with different time delays.Concerning transmitting, transmitting after focal point is near, i.e. time delay is larger, and focal point is far first launched, and time delay is less.Concerning receiving, the echo of same focus point, the time that arrives each array element is also different, what focal point was near first receives echo, focal point far away after receive echo, these time delays are calculated, could exactly the signal of same focus be superimposed.Therefore, the accuracy that time delay is calculated has determined focusing effect, and then affects the quality of image, especially harmonic image.
Ultrasonic imaging divides again multiple scan pattern, as is extended to picture, the non-picture that is extended to, and deflection scanning etc., if the time delay of every sweep trace under every kind of scan pattern, each focus is left, data volume can be very huge.Also have some ultrasonic systems to provide array element coordinate, focal coordinates, deflection angle etc. to logic, logic is carried out real-time computation delay by certain algorithm, but these methods are comparatively complicated.
At present best solution is to use unified time delay formula to calculate different probes in the even time delay of sweep trace when different densities of deflection, non-deflection, and delay circuit is unified and stored parameter amount is little.But because deposited focus correlation parameter is similar to, time delay formula can cause this error larger on the impact of time delay, and delay time error can cause focusing accuracy to decline, and also can show as pseudomorphism under filtering harmonic wave.
Summary of the invention
There is in order to solve prior art the defect that time delay out of true, logic realization are comparatively complicated, the present invention proposes a kind of computing simply and calculates accurate hyperchannel sweep delay computing method and device, improve the image quality of ultrasonic image-forming system, the method is applicable to linear array, protruding battle array, three kinds of probe types of phased array, be applicable to non-deflection scanning, deflection scanning, and various line density.
The present invention adopts following technical scheme to realize: a kind of hyperchannel sweep delay computing method, and it comprises step:
Take arbitrfary point on array element surface as reference point, calculate each array element central point in passage, the sweep trace starting point position parameter with respect to this reference point;
Be calculated as follows the distance dn of each array element central point to focus on sweep trace, dn = F 2 + ( L n 1 - L S 1 ) 2 + ( L n 2 - L S 2 ) 2 + 2 F [ cos ( θ - σ ) ( L n 1 - L S 1 ) + sin ( θ - σ ) ( L n 2 - L S 2 ) ]
Wherein, θ is the angle of the probe face normal of sweep trace and process sweep trace starting point; σ is the angle through the probe face normal of the probe face normal of reference point and process sweep trace starting point; F is the distance of sweep starting point to focus point; L n1for reference point is to the distance perpendicular to the vertical line through reference point probe face normal through array element central point, L n2for array element central point is to the distance through reference point probe face normal; L s1for reference point is to the distance perpendicular to the vertical line through reference point probe face normal through sweep trace starting point, L s2for sweep trace starting point is to the distance through reference point probe face normal;
Calculate focal point F on every sweep trace according to following formula and arrive the delay time tn after the quantification of each passage: wherein, k is quantified precision parameter, and SoundV is the velocity of sound, and T is the sampling time.
It also comprises that address offset calculates.Address offset calculates two kinds of implementations: the first, take time of receiving when forward focal point as time delay reference point, deduct the amount of delay of current focus, and obtain final delay time.Another kind is, take when forward focal point central passage x time is as time delay reference point, to add that the delay time of current focus obtains final delay time.
A kind of hyperchannel sweep delay parameter calculation apparatus, its it comprise:
Coordinate parameters storer, for storing coordinate amount Fcos (θ-σ), Fsin (θ-σ), L n1, L n2, L s1and L s2;
Coordinate pre-process circuit, for first calculating A=L n1-L s1, B=L n2-L s2, A 2+ B 2and B*b+A*a, wherein a=Δ Fcos (θ-σ), b=Δ Fsin (θ-σ), F=Δ F*i;
Focus totalizer, for calculating (B*b+A*a) * i;
Sequence number treatment circuit, for calculate focus sequence number i square i 2;
Time delay computing circuit, for square root again that the result of calculation of coordinate pre-process circuit, focus totalizer and sequence number treatment circuit is sued for peace, press formula:
dn = i 2 * ΔF 2 + A 2 + B 2 + ( B * b + A * a ) * i * ΔF * 2 Computation delay is apart from dn, then presses tn = dn k * SoundV * T Calculate and obtain delay time tn;
Wherein, θ is the angle of the probe face normal of sweep trace and process sweep trace starting point; σ is the angle through the probe face normal of the probe face normal of reference point and process sweep trace starting point; F is the distance of sweep starting point to focus point; L n1for reference point is to the distance perpendicular to the vertical line through reference point probe face normal through array element central point, L n2for array element central point is to the distance through reference point probe face normal; L s1for reference point is to the distance perpendicular to the vertical line through reference point probe face normal through sweep trace starting point, L s2for sweep trace starting point is to the distance through reference point probe face normal; K is quantified precision parameter, and SoundV is the velocity of sound, and T is the sampling time, and Δ F is the distances of adjacent two reception focuses on sweep trace.
Wherein, the output terminal of time delay computing circuit connects the address offset circuit for calculating reception delay address, and it adds that by the amount of delay calculating a side-play amount is used as addressing address.
Wherein, described side-play amount is amount of delay corresponding to focal length.
Compared with prior art, the present invention has following beneficial effect:
1, the present invention has effectively reduced the error in time delay calculating, makes the time delay of hyperchannel scanning more accurate, has improved focusing accuracy, can promote first-harmonic picture quality, the pseudomorphism under harmonic carcellation.
2, the invention enables logic realization simpler, due to the improvement of formula, make to realize and can utilize public multiplier and totalizer to carry out pre-service to coordinate, greatly reduced the real-time operation amount during time delay is calculated, thus can saving resource.
Accompanying drawing explanation
Figure 1A and Figure 1B are respectively the geometric representation of the time delay distance of protruding battle array, phased array (or linear array);
Fig. 2 is the structural representation of ultrasonic image-forming system;
Fig. 3 is the structural representation of an embodiment of reception delay control module;
Fig. 4 is the structural representation of another embodiment of reception delay control module
Fig. 5 A and Fig. 5 B are respectively the schematic diagram of two kinds of amount of delay account forms.
Embodiment
Figure 1A is the geometric representation of the time delay distance of protruding battle array, and Figure 1B is the geometric representation of the time delay distance of phased array or linear array.Wherein, C is the center of circle of protruding battle array, O is coordinate reference points (O point can be any point on probe array element face), the probe normal that OC was O, and A is certain element position, SF is sweep trace, wherein S point is sweep trace starting point, and J is focus point or focus, and θ is sweep trace SF and the angle of the probe normal of ordering through S, the namely deflection angle of sweep trace, σ is the angle of the probe normal of ordering through O point and S.Line segment SK vertical with line segment OC (that is: SK ⊥ OC), line segment AT is vertical with line segment OC (that is: AT ⊥ OC) also, and line segment SK is the vertical range of S point to OC, and line segment AT is the vertical range of A to OC, and OK is the line segment of O to K, OT is the line segment of O to T.For phased array or linear array, T, K, 3 coincidences of O, make OK=LS1, KS=LS2, OT=Ln1, TA=Ln2.∠ OCS=σ, LS1 is the length of line segment OK, and LS2 is the length of line segment KS, and Ln1 is the length of line segment OT, and Ln2 is the length of line segment TA.σ=0 for linear array and phased array, L s1=L n1=0, the array element of ultrasonic probe can be calculated by following formula to the distance dn of focal point F on sweep trace, and n is array element numbering:
dn = [ F cos ( θ - σ + ( L n 1 - L S 1 ) ] 2 + [ F sin ( θ - σ ) + ( L n 2 - L S 2 ) ] 2
L in above formula n1, L n2for the position parameter of ordering with respect to reference point O in array element center in passage n, L s1, L s2for sweep starting point is with respect to the position parameter of reference point; θ is the angle of the probe face normal of sweep trace and process sweep trace starting point; σ is the angle through the probe face normal of the probe face normal of reference point and process sweep trace starting point; F is the distance of sweep starting point to focus point; L n1for reference point is to the distance perpendicular to the vertical line through reference point probe face normal through array element central point, L n2for array element central point is to the distance through reference point probe face normal; L s1for reference point is to the distance perpendicular to the vertical line through reference point probe face normal through sweep trace starting point, L s2for sweep trace starting point is to the distance through reference point probe face normal.
In the time realizing, first will be to Fcos(θ-σ), Fsin(θ-σ), L n1, L n2, L s1, L s2after quantizing, remove to calculate dn again, calculate with velocity of sound SoundV and sampling time T quantification, the dn finally calculating represents the delay time tn of each passage, soundV is the velocity of sound, and the clock period of T for adopting in quantification, tn is the communication channel delay time after quantizing, k is quantified precision parameter, for improving the quantified precision of time delay, as k=0.25, just can quantified precision rise to 4 times of sampling precision by rising sample interpolation filtering.
Due to cos (θ-σ), sin (θ-σ) may have a lot of decimals, after quantification due to bit wide restriction, can only be with the decimal of a location number, precision is limited, therefore can be with error, the formula of above-mentioned calculating dn can make this error amplify.Formula is deformed into:
dn = F 2 + ( L n 1 - L S 1 ) 2 + ( L n 2 - L S 2 ) 2 + 2 F [ cos ( θ - σ ) ( L n 1 - L S 1 ) + sin ( θ - σ ) ( L n 2 - L S 2 ) ] - - - ( 1 )
Formula (1) is amount of delay and calculates fundamental formular, can effectively reduce this error, improves delay precision.
Below implement device and step are further described in detail.
Fig. 2 is the basic structure of ultrasonic system, wherein transmit and receive link and all need to carry out time delay control, emission delay has determined the precedence of waveform in different passages, user can select the different depths of focus, system is calculated transmitting focusing parameter in real time according to this degree of depth, also can select many focus imagings, deflection scanning, T-shaped imaging, spatial compound imaging, scanning density etc., different imaging mode focusing parameter differences, system can pass to hardware counting circuit by coordinate amount according to user's operation, hardware counting circuit calculates the delay data of every each passage of sweep trace in real time, thereby complete emission scan, for every sweep trace, after the waveform of passage is launched the latest, start at once and receive scanning, constantly the echo data of each passage is simulated and amplified and AD sampling, the data of sampling are placed in an echo data memory block, the memory address of the data of each passage is continuous, each passage sequential storage, after memory block is filled with, can carry out wave beam according to the sampled data of AD synthesizes, Data Update, wherein first synthetic link of wave beam is carried out time delay addressing to receiving data exactly, in each passage, find the echo data of same imaging point, these echo datas are carried out to apodization, beam data after output is synthetic, after completing follow-up processing, obtain ultrasonoscopy, so carry out wave beam synthetic before, will be according to the attribute of sweep trace, the geometric parameter of probe calculates each communication channel delay amount of the each acceptance point on sweep trace, and these amount of delay are converted into addressing address, be stored in time delay address caching, carrying out wave beam when synthetic, take out AD addressing data address by corresponding collectiong focusing point, each channel data is carried out to addressing, then the AD data after addressing are carried out to the synthetic subsequent treatment link of wave beam.
Can find out that from elaboration above transmitting and receiving focusing is the key link that realizes ultrasonic imaging, they realize respectively in emission delay control module and reception delay control module.Transmitting and receiving time delay is all to calculate according to formula (1), but because transmitting is that single focus focuses on, delay parameter amount is little, in advance good each communication channel delay value can be left to issue logic, also can calculate in real time.
Collectiong focusing needs to calculate in real time, and in an embodiment as shown in Figure 3, reception delay control module comprises coordinate parameters storer, coordinate pre-process circuit, sequence number treatment circuit, focus totalizer and time delay computing circuit etc.Because each point on received scanline will focus on, because focus is equally spaced, be focus amount of separation so software writes, need to be according to focus sequence number and distance computation focal length coordinate amount.
Software is by coordinate amount Fcos (θ-σ), Fsin (θ-σ), L after quantizing n1, L n2, L s1, L s2be written to coordinate parameters storer.Because for receiving, focus is equally spaced, so only need to write focus amount of separation a=Δ Fcos (θ-σ), b=Δ Fsin (θ-σ), and in a system, Δ F is that adjacent two distance and the Δ Fs of reception focus on sweep trace are known, only needs focusing sequence number i to do corresponding calculating: F=Δ F*i.
Coordinate pre-process circuit, utilizes public multiplier and totalizer, calculates in advance the amount that some do not change with focus sequence number:
A=L n1-L S1
B=L n2-L S2
Obtain again thus A 2+ B 2, B*b+A*a
Due to dn = i 2 * ΔF 2 + A 2 + B 2 + ( B * b + A * a ) * i * ΔF * 2 , In formula, Δ F generally gets 2 integral number power, therefore multiplies each other and can realize with displacement with Δ F, therefore, in real-time computation delay, only need to calculate square i of focus sequence number i 2(B*b+A*a) * i, by sequence number treatment circuit calculate focus sequence number i square i 2, by focus accumulator computes (B*b+A*a) * i.Visible this method has greatly reduced real-time operation amount, time delay is calculated easier.
By time delay computing circuit, above-mentioned every summed result is carried out to evolution, obtain time delay apart from dn, then press calculate and obtain delay time tn, remove to control collectiong focusing with the delay time that calculates acquisition and can realize reception scanning.
As shown in Figure 4, in the reception delay control module of another embodiment, increased address offset circuit, address offset circuit can have again two kinds of implementations:
1, take time of receiving when forward focal point as time delay reference point, in address offset circuit, to deduct the amount of delay of current focus, i.e. amount of delay corresponding to focus: dn '=dn-F, wherein dn is root circuit result of calculation, dn ' is final amount of delay, as shown in Figure 5A.
2, take when forward focal point central passage x time is as time delay reference point, will add the amount of delay of current focus: dn'=dn+F in address offset circuit, wherein dn is root circuit result of calculation, and dn ' is final amount of delay, as shown in Figure 5 B.
To sum up, compared with prior art, the present invention has following useful technique effect:
1, the present invention has effectively reduced the error in time delay calculating, makes the time delay of hyperchannel scanning more accurate, has improved focusing accuracy, can promote first-harmonic picture quality, the pseudomorphism under harmonic carcellation.
2, the invention enables logic realization simpler, due to the improvement of formula, make to realize and can utilize public multiplier and totalizer to carry out pre-service to coordinate, greatly reduced the real-time operation amount during time delay is calculated, thus can saving resource.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.

Claims (6)

1. hyperchannel sweep delay computing method, is characterized in that, comprise step:
Take arbitrfary point on array element surface as reference point, calculate each array element central point in passage, the sweep trace starting point position parameter with respect to this reference point;
Be calculated as follows the distance dn of each array element central point to focus on sweep trace,
dn = F 2 + ( L n 1 - L S 1 ) 2 + ( L n 2 - L S 2 ) 2 + 2 F [ cos ( θ - σ ) ( L n 1 - L S 1 ) + sin ( θ - σ ) ( L n 2 - L S 2 ) ]
Wherein, θ is the angle of the probe face normal of sweep trace and process sweep trace starting point; σ is the angle through the probe face normal of the probe face normal of reference point and process sweep trace starting point; F is the distance of sweep starting point to focus point; L n1for reference point is to the distance perpendicular to the vertical line through reference point probe face normal through array element central point, L n2for array element central point is to the distance through reference point probe face normal; L s1for reference point is to the distance perpendicular to the vertical line through reference point probe face normal through sweep trace starting point, L s2for sweep trace starting point is to the distance through reference point probe face normal;
Calculate focal point F on every sweep trace according to following formula and arrive the delay time after the quantification of each passage wherein, k is quantified precision parameter, and SoundV is the velocity of sound, and T is the sampling time.
2. hyperchannel sweep delay computing method according to claim 1, is characterized in that, take time of receiving when forward focal point as time delay reference point, deduct the amount of delay of current focus, obtain final delay time.
3. hyperchannel sweep delay computing method according to claim 1, is characterized in that, take when forward focal point central passage x time is as time delay reference point, add that the delay time of current focus obtains final delay time.
4. a hyperchannel sweep delay parameter calculation apparatus, is characterized in that, it comprises:
Coordinate parameters storer, for storing coordinate amount Fcos (θ-σ), Fsin (θ-σ), L n1, L n2, L s1and L s2;
Coordinate pre-process circuit, for first calculating A=L n1-L s1, B=L n2-L s2, A 2+ B 2and B*b+A*a, wherein a=Δ Fcos (θ-σ), b=Δ Fsin (θ-σ), F=Δ F*i;
Focus totalizer, for calculating (B*b+A*a) * i;
Sequence number treatment circuit, for calculate focus sequence number i square i 2;
Time delay computing circuit, for square root again that the result of calculation of coordinate pre-process circuit, focus totalizer and sequence number treatment circuit is sued for peace, press formula:
dn = i 2 * Δ F 2 + A 2 + B 2 + ( B * b + A * a ) * i * ΔF * 2 Computation delay is apart from dn, then presses calculate and obtain delay time tn;
Wherein, θ is the angle of the probe face normal of sweep trace and process sweep trace starting point; σ is the angle through the probe face normal of the probe face normal of reference point and process sweep trace starting point; F is the distance of sweep starting point to focus point; L n1for reference point is to the distance perpendicular to the vertical line through reference point probe face normal through array element central point, L n2for array element central point is to the distance through reference point probe face normal; L s1for reference point is to the distance perpendicular to the vertical line through reference point probe face normal through sweep trace starting point, L s2for sweep trace starting point is to the distance through reference point probe face normal; K is quantified precision parameter, and SoundV is the velocity of sound, and T is the sampling time, and Δ F is the distances of adjacent two reception focuses on sweep trace.
5. hyperchannel sweep delay parameter calculation apparatus according to claim 4, it is characterized in that, the output terminal of time delay computing circuit connects the address offset circuit for calculating reception delay address, and it adds that by the amount of delay calculating a side-play amount is used as addressing address.
6. hyperchannel sweep delay parameter calculation apparatus according to claim 5, is characterized in that, described side-play amount is amount of delay corresponding to focal length.
CN201210591344.5A 2012-12-31 2012-12-31 Multichannel-scanning-time-delay calculating method and device Pending CN103913747A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107320129A (en) * 2017-06-07 2017-11-07 青岛海信医疗设备股份有限公司 The delay parameter real-time computing technique and device of ultrasonic signal based on medical science
CN115308520A (en) * 2022-10-10 2022-11-08 杭州三海电子有限公司 Method, program and circuit for determining delay time of multichannel sequential sampling current

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CN101900808A (en) * 2010-06-30 2010-12-01 深圳市蓝韵实业有限公司 Delay parameter computation method for multi-channel scanning and device thereof
CN101915916A (en) * 2010-08-04 2010-12-15 深圳市蓝韵实业有限公司 Method for processing ultrasonic emission delay

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Publication number Priority date Publication date Assignee Title
WO2001026555A1 (en) * 1999-10-15 2001-04-19 Hitachi Medical Corporation Ultrasonic imaging device
CN101900808A (en) * 2010-06-30 2010-12-01 深圳市蓝韵实业有限公司 Delay parameter computation method for multi-channel scanning and device thereof
CN101915916A (en) * 2010-08-04 2010-12-15 深圳市蓝韵实业有限公司 Method for processing ultrasonic emission delay

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Publication number Priority date Publication date Assignee Title
CN107320129A (en) * 2017-06-07 2017-11-07 青岛海信医疗设备股份有限公司 The delay parameter real-time computing technique and device of ultrasonic signal based on medical science
CN115308520A (en) * 2022-10-10 2022-11-08 杭州三海电子有限公司 Method, program and circuit for determining delay time of multichannel sequential sampling current
CN115308520B (en) * 2022-10-10 2023-01-24 杭州三海电子有限公司 Method, program and circuit for determining delay time of multichannel sequential sampling current

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Application publication date: 20140709