CN102949205A - Method and system for space composite imaging - Google Patents
Method and system for space composite imaging Download PDFInfo
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- CN102949205A CN102949205A CN2011102460453A CN201110246045A CN102949205A CN 102949205 A CN102949205 A CN 102949205A CN 2011102460453 A CN2011102460453 A CN 2011102460453A CN 201110246045 A CN201110246045 A CN 201110246045A CN 102949205 A CN102949205 A CN 102949205A
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Abstract
The invention discloses a method and a system for space composite imaging. The method includes steps: controlling deflection imaging, namely, adding scanning times of 0 deflection angle in each scanning period to obtain a series of scanning images Ax(t); and B, subjecting the scanning images Ax(t), composite images C(t-1) in a previous scanning period and corresponding scanning images Ax(t-1) with same deflection angle in the previous scanning period to data integration processing according to weight to obtain composite images C(t) corresponding to the current scanning period. By adding the proportion of scanning images of 0 angle in composite images or by subjecting the composite images to noise reduction by frame correlation indexes, speckle noise can be effectively inhibited, sound shadow can be reduced, motion blur of scanning objects in composite images of multiple angles can be improved, and quality of the composite images can be improved.
Description
Technical field
The present invention relates to the Compound scan technology in the ultrasonic system, especially relate in a kind of ultrasonic system the method and the corresponding spatial compound imaging system that merge the implementation space complex imaging by the multi-angle scan-data.
Background technology
Spatial compound imaging is a kind ofly along different angles sweep object to be scanned, and then the picture element that the image of these different angles is corresponding superposes and forms the formation method of piece image.For example US Patent No. 6,126, and 599, US6,423,004B1 and US6,464,638, all in processing, ultrasound imaging data adopted the space compound technology to improve the image quality of ultrasonoscopy.In addition, US Patent No. 6,733,458 use B pattern (B-Steer) technology in ultrasonic guidance is used, with the acoustic beam inclination certain angle of transducer emission, the better vision that adopts space compound to obtain interventional medical equipment (such as the suction-type biopsy needle etc.) characterizes.
Therefore, space compound can suppress speckle noise, clutter and other ultrasonic artifacts to the impact of picture quality, strengthen the resolution capability between tissue, can improve significantly the definition of low contrast tissue and minute lesion in the ultrasonoscopy, clearly the border between display organization.
Yet although space compound has reduced to a certain extent noise speckle, optimized image quality, it still exists the some shortcomings part.Because the difference of multiple image scanning area, the overlapping frame number of the zones of different of the image after compound is different, thereby the image effect of zones of different difference to some extent.
As shown in Figure 1, being complex as example with three two field pictures describes.The compound two field picture that obtains of image of three frame different angles scanning, the image after compound has four zones, and regional A comprises three frame image informations, and B zone and regional D comprise two frame image informations, and regional C only has the information of 0 angle two field picture.This can cause the level of zones of different electronic noise different, and the noise region that has is large, and the noise region that has is relatively smaller.In addition, the impact of the directivity of being popped one's head in, the image that different directions scanning obtains is in difference to some extent qualitatively, and scanning angle increases, and the signal to noise ratio of image can descend, even can produce some pseudomorphisms.
For solving the inconsistent not good problem of image display effect that causes of zones of different signal to noise ratio of combination picture, Chinese patent application CN200810068313 discloses a kind of for the space compound method and apparatus of ultra sonic imaging and the ultrasonic image-forming system that comprises this device.Wherein said method comprises composite steps, is used for being weighted compound to the multi-angle image after the scan conversion; And the circumgyration stretch step, being used in the constant situation of image average GTG mapping, the gray-scale distribution of the image after by rotation and stretching conversion that weighting is compound is adjusted into compound front gray-scale distribution basically identical.Wherein, the image after compound to weighting multiply by the circumgyration stretch parameter, realizes the circumgyration stretch of the image after compound to weighting.
Summary of the invention
The defective that exists in order to overcome prior art, the present invention proposes a kind of method and corresponding spatial compound imaging system that the multi-angle scan-data merges the implementation space complex imaging that pass through of ultrasonic system.
The present invention adopts following technical scheme to realize: a kind of spatial compound imaging method, and it comprises step:
A, control are deflected into picture, increase the scanning times of 0 deflection angle in each scan period, obtain a series of scanogram A
x(t);
B, with scanogram A
x(t) with the combination picture C (t-1) of last scan period, scanogram A corresponding to equal deflection angle in the last scan period
x(t-1) carry out Data Fusion by weight, obtain combination picture C (t) corresponding to current scan period.
Wherein, described step B specifically comprises step:
To scanogram A
x(t) resample, obtain scanogram A
x(t) value of correspondence each pixel D in combination picture C (t);
From the combination picture C (t-1) of last scan period, cut scanogram A in the last scan period
x(t-1) resampling image obtains Δ C (t), namely
Obtain the scanogram A of current scan period
x(t) after, be weighted calculating with Δ C (t), obtain compound as a result C (t) corresponding to current scan period, namely
, wherein, α is weighted value, and 0＜α≤1;
With the combination picture C (t) of current scan period and the scanogram A of current scan period
x(t) resampling result is kept in the image storage.
Wherein, α=1/N, wherein N is scanogram A in the scan period
x(t) totalframes.
In addition, the present invention also discloses a kind of spatial compound imaging method, and it comprises step:
A, precompute the frame correlation coefficient matrix of each deflection angle, wherein, frame correlation coefficient matrix corresponding to each deflection angle is at scanogram A
x(t) zones of different has different frame correlation coefficient Coef
x
B, the scanogram Ax (t) of the combination picture C (t-1) of last scan period and current scan period is pressed frame correlation coefficient Coef
xCarry out the frame correlation computations, the combination picture C (t) after obtaining merging, namely
Wherein, described steps A specifically comprises:
Combination picture C (t) is divided into a plurality of zoness of different according to the overlapping situation of scanning, calculates the information slip that zones of different is scanned according to deflection angle;
According to the scanning frame per second of each scanning area under each deflection angle, calculate the interval Δ t that each zone is being scanned for continuous 2 times;
According to interval Δ t, calculate the frame correlation coefficient of each zones of different under deflection angle x scanning
;
Wherein, when a zone was not scanned, frame correlation coefficient directly got 1;
Be exponential function
, k is the control parameter.
Wherein, described step B specifically comprises:
To scanogram A
x(t) resample, obtain scanogram A
x(t) value of correspondence each pixel D in combination picture C (t);
To the image A after resampling
x(t) the combination picture C (t-1) with the last scan period carries out the frame correlation computations, obtains combination picture C (t),
Combination picture C (t) is upgraded in image storage.
Moreover the present invention discloses a kind of spatial compound imaging system, comprises at least: be used for storage of complex image C (t) image storage; Be used for storage frame correlation coefficient Coef
xThe frame correlation coefficient memorizer; The fused controlling unit; The image co-registration unit; Carry out spatial compound imaging by fused controlling unit controls image co-registration unit by described spatial compound imaging method.
Compared with prior art, the present invention has following beneficial effect:
The multi-angle scan-data that the present invention proposes merges spatial compound imaging method and the system that realizes, because by increasing the proportion of 0 angle scanning image in combination picture, or by frame correlation coefficient combination picture is carried out noise reduction process, make the image after compound comprise more useful informations, in combination picture, can effectively suppress speckle noise, weaken sound shadow etc., and improve to a certain extent the motion blur of sweep object in the multi-angle combination picture, improve the quality of combination picture.
Description of drawings
Fig. 1 is the compound sketch map of image of three frame different angles scanning;
Fig. 2 is the structural representation of compuscan among the present invention the 1st embodiment;
Fig. 3 is the schematic flow sheet of space composite imaging method among the present invention the 1st embodiment;
Fig. 4 is the scan period sketch map of a plurality of angle fusion imagings among Fig. 3;
Fig. 5 is the sketch map that data resample among the present invention;
Fig. 6 is the structural representation of compuscan among the present invention the 2nd embodiment;
Fig. 7 is the schematic flow sheet of space composite imaging method among the present invention the 2nd embodiment;
Fig. 8 is the sketch map of multi-angle scanogram subregion among the present invention.
The specific embodiment
As shown in Figure 2, in the compuscan of the present invention the 1st embodiment, the sweep parameter that transmits and receives passage by control namely can realize the skew of scanning line.
Under the control of fused controlling unit, the sweep parameter production unit generates the sweep parameter of different scanning angle (or scanning direction) successively; Under each scanning angle, scan control circuit is controlled with sweep parameter and is transmitted and received scanning; Form the unit in scanning channel data is merged the formation scanning line; By digital signal processing unit every scanning line is carried out Digital Signal Processing, obtain the echo information of sweep object, generate the scanogram of sweep object, and store current scanogram to image storage; Behind the multiframe scanogram that has a multi-angle scan period in the image storage, startup image co-registration unit carries out fusion treatment to the multiple image of different angles, after being processed through scanning coordinate spatial alternation etc. by display processing unit again, the combination picture after display output multi-angle merges.
Specifically, in conjunction with shown in Figure 3, in the 1st embodiment, the method for the multiframe scanogram of many scanning angles being carried out spatial compound imaging comprises following performing step:
Step S11, control are deflected into picture, increase the not scanning times of deflection angle (or 0 deflection angle) in each scan period, increase in multiple image corresponding to each scan period the not proportion of deflection scanning image.
Control is deflected into picture and produces multiframe scanogram corresponding to different scanning deflection angle.Specifically, be deflected into picture and be controlled to be periodically control, according to the different deflection angle of setting.The generation of different deflection angle component drawings pictures order can be disposed by configuration data file in each cycle; Carry out first the scanning of left avertence gyration, then carry out not deflection angle scanning, carry out at last the scanning of right avertence gyration.Order for number, deflection angle and the emission of the deflection scanning emission angle of different gears can be configured by configuration data file by fused controlling unit controls sweep parameter generation unit; Scan control circuit carries out gated sweep by the data file configuration, by the delay and focusing parameter that control transmits and receives, realizes that control transmits and receives the deflection of scanning beam.
As shown in Figure 4, each two field picture of each angle in the in the prior art scan period of General Spatial complex imaging, in the complex imaging such as 7 angles, three left avertences turn scanogram A
-1, A
-2And A
-3, three right avertence turn scanogram A
1, A
2And A
3With a deflection scanning image A not
0, scan successively according to the difference of deflection angle, until all sweeping, all angles go over, then sequentially carry out the scanning in next cycle by same deflection angle.
And the present invention changes traditional space compound scan mode, increases the not scanning times of deflection angle in each scan period, thereby increases in the final combination picture not deflection scanning image A
0Component, when reaching the space compound effect, improved the quality of image.
Still take the scanning of 7 angles as example, the present invention inserts the non-deflection angle of a frame (0 angle) scanogram between N frame (N=1,2 or 3) deflection angle scanogram, inserts non-deflection angle scanogram A when having enumerated N=2 among Fig. 4
0Situation, the scanning of angle one frame of more traditional like this space compound is compared, and has increased the proportion of 0 angle scanning image in the combination picture.
Since the increase of one-period scanning frame number, the corresponding space that needs to increase image storage, the non-deflection angle scanogram A of diverse location in the scanning sequence
0Separate storage in image storage, independent process in Combined Processing namely has been equivalent to increase the scanogram of a deflection angle.
Step S12, to deflection angle x(or scanning sequence number x) scanogram A
x(t) resample, for each pixel D among the combination picture C (t), obtain the value of each pixel D among the corresponding combination picture C of scanogram Ax (t) (t).
Scanogram Ax (t) being resampled, be transformed in the scan coordinate system of combination picture, is exactly for each the pixel D among the combination picture C (t) specifically, obtains the corresponding value at pixel D of scanogram Ax (t) according to interpolation method.
As shown in Figure 5, to each the pixel D among the combination picture C (t), in scanogram Ax (t), find out corresponding a plurality of data point S1 that close on, S2 ... .Sn, use method for resampling can obtain scanogram Ax (t) corresponding to the value of D point position, that is:
, wherein, Fun represents the function that resamples.
Scanogram A during wherein, for deflection angle x=0
0(t), can save the calculating of step S12.
Step S13, owing to just know in advance the scanning sequency of deflection angle, therefore when carrying out a certain deflection angle x scanning, from the combination picture C (t-1) in upper one scan cycle, cut this deflection angle x at the resampling image in upper one scan cycle, obtain Δ C (t), that is:
Wherein, α is scanogram A corresponding to deflection angle x
xWeighted value in combination picture C.And 0＜α≤1.Generally speaking, α=1/N, wherein N is the totalframes of scanogram in the scan period; A
x(t-1) expression deflection angle x is at the scanogram in upper one scan cycle.
The scanogram A of this scan period of step S14, acquisition deflection angle x
x(t) after, be weighted calculating with Δ C (t), obtain this combination picture C (t), that is:
Step S15, the combination picture C (t) that incites somebody to action this scan period and the scanogram A of this scan period
x(t) resampling result is kept in the image storage, in order to next compound use.
Therefore, press step S12-step S15 to scanogram A by the image co-registration unit
x(t) carry out with image storage in combination picture C (t-1), the scanogram A of last same scan sequence number of last time
x(t-1) carry out data fusion, obtain the combination picture C (t) of this scanning.
Therefore, in the 1st embodiment, increased the scanogram of 0 deflection angle in the multi-angle scan pattern, totalframes N increases in the scan period, each scanogram A
xWeight α in combination picture C diminishes, thereby has increased the scanogram A of 0 deflection angle
0(t) proportion in final combination picture C (t) (being the information that contains more scanogram A0 (t) among the combination picture C (t)), thus the quality of combination picture C (t) can be improved.
In the 2nd embodiment of the present invention, the mode relevant with frame realizes data fusion, when the pixel of zones of different scans at different deflection angles, merge the coefficient difference to combination picture, thereby effectively reduce the motion blur that sweep object occurs in the combination picture.
As shown in Figure 6, the difference with the 1st embodiment is: 1, only preserve the combination picture C (t-1) that merged last time in image storage; 2, increased a frame correlation coefficient memorizer, storage each deflection angle x(comprises x=0 in the frame correlation coefficient memorizer) be used for the frame correlation coefficient matrix of image co-registration.
The frame correlation coefficient matrix corresponding according to the deflection angle of this scanning, in the image co-registration unit with the combination picture C (t-1) of a upper scan period and the scanogram A of this scan period
x(t) carry out combination picture C (t) after the frame correlation computations obtains merging, and combination picture C (t) is updated stored in the image storage.
In conjunction with shown in Figure 7, the 2nd embodiment comprises following performing step:
Step S21, the initial phase when complex imaging starts just precompute the frame correlation coefficient matrix of each deflection angle, are stored in the frame correlation coefficient memorizer.Wherein, the frame correlation coefficient matrix of each deflection angle is at scanogram A
x(t) zones of different has different frame correlation coefficient Coef
x
Step S22, identical with step S12 among Fig. 3 resamples to current image.
Step S23, to the image A after resampling
x(t) carry out the frame correlation computations with the combination picture C (t-1) in upper one scan cycle, obtain the combination picture C (t) behind the current scan period fusing image data.
。
Step S24, combination picture C (t) is upgraded in image storage, use during in order to next Data Fusion.
Because frame correlation coefficient Coef
xLess than 1, therefore along with the increase of time, combination picture before is more and more less on the impact of current combination picture C (t), thereby can effectively reduce the problem of motion blur.
Wherein, among the step S21, calculate frame correlation coefficient Coef
xMethod as follows: take the scanning of 5 deflection angles as example, such as Fig. 8, combination picture C (t) can be divided into these 9 different zones of A, B, C, D, E, F, G, H and I according to the difference of the overlapping situation of scanning, for the scanogram A of different deflection angles
x(t) region quantity that occupies in combination picture C (t) is different with the position, and the image that turns such as left avertence is being ABD through the zone occupied in combination picture after resampling, and other zones are outside sweep limits.
Suppose: deflection angle is from left to right numbered and is followed successively by 1,2,3,4 and 5, and then in Fig. 7, the zones of different of combination picture C (t) is scanned situation under different deflection angles as shown in table 1 below:
| t | 1 | 2 | 3 | 4 | 5 | 1 | 2 | 3 | 4 | 5 |
| A | √ | √ | √ | √ | √ | √ | √ | √ | √ | √ |
| B | √ | √ | √ | √ | X | √ | √ | √ | √ | X |
| C | X | √ | √ | √ | √ | X | √ | √ | √ | √ |
| D | √ | √ | √ | X | X | √ | √ | √ | X | X |
| E | X | X | √ | √ | √ | X | X | √ | √ | √ |
| F | X | √ | √ | √ | X | X | √ | √ | √ | X |
| G | X | √ | √ | X | X | X | √ | √ | X | X |
| H | X | X | √ | √ | X | X | X | √ | √ | X |
| I | X | X | √ | X | X | X | X | √ | X | X |
Table
Zones of different is scanned information slip in two scan periods
Wherein, √ represents that this subregion has been scanned at this deflection angle in the table 1, and X represents not to be scanned, and such as the regional ABD that deflection angle 1 can scan, other zones then can not be scanned.
Therefore, specifically, calculate frame correlation coefficient Coef
xMethod comprise the steps:
At first, calculate zones of different according to deflection angle and be scanned information slip, such as the form 1 of example.
Secondly, according to the scanning frame per second of each scanning area under each deflection angle, calculate the interval Δ t that each zone is being scanned for continuous 2 times.
Suppose that two vertical intervals are spaced apart T, then waiting time of being swept to of zones of different can be different when different deflection angles scan.Illustrate as scanning with deflection angle 2, when deflection angle 2 scanning, the a-quadrant just has been scanned at deflection angle 1, so be T from the interval that was scanned last time; Equally, zone BD is apart from the interval Δ t=T that was scanned last time, interval of delta t=2T that zone C was swept apart from last time, zone F is apart from the interval Δ t=3T that was scanned last time, zone G is apart from the interval Δ t=4T that was swept last time, and this Three regions of regional E, H and I is not scanned at deflection angle 2.
Again, at the interval Δ t that is scanned for continuous 2 times, calculate the frame correlation coefficient Coef of each zones of different under deflection angle x scanning according to regional
x:
The above only is preferred embodiment of the present invention, not in order to limiting the present invention, all any modifications of doing within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a spatial compound imaging method is characterized in that, described method comprises step:
A, control are deflected into picture, increase the scanning times of 0 deflection angle in each scan period, obtain a series of scanogram A
x(t);
B, with scanogram A
x(t) with the combination picture C (t-1) of last scan period, scanogram A corresponding to equal deflection angle in the last scan period
x(t-1) carry out Data Fusion by weight, obtain combination picture C (t) corresponding to current scan period.
2. described spatial compound imaging method according to claim 1 is characterized in that described step B specifically comprises step:
To scanogram A
x(t) resample, obtain scanogram A
x(t) value of correspondence each pixel D in combination picture C (t);
From the combination picture C (t-1) of last scan period, cut scanogram A in the last scan period
x(t-1) resampling image obtains Δ C (t), namely
Obtain the scanogram A of current scan period
x(t) after, be weighted calculating with Δ C (t), obtain compound as a result C (t) corresponding to current scan period, namely
Wherein, α is weighted value, and 0＜α≤1.
3. described spatial compound imaging method according to claim 2 is characterized in that described step B also comprises step:
With the combination picture C (t) of current scan period and the scanogram A of current scan period
x(t) resampling result is kept in the image storage.
4. described spatial compound imaging method according to claim 2 is characterized in that, α=1/N, and wherein N is scanogram A in the scan period
x(t) totalframes.
5. a spatial compound imaging system is characterized in that, described system comprises at least: be used for storage of complex image C (t) and scanogram A
x(t) resampling result's image storage; The fused controlling unit; The image co-registration unit; Carry out spatial compound imaging by fused controlling unit controls image co-registration unit by any one described spatial compound imaging method of claim 1-4.
6. a spatial compound imaging method is characterized in that, described method comprises step:
A, precompute the frame correlation coefficient matrix of each deflection angle, wherein, frame correlation coefficient matrix corresponding to each deflection angle is at scanogram A
x(t) zones of different has different frame correlation coefficient Coef
x
B, the scanogram Ax (t) of the combination picture C (t-1) of last scan period and current scan period is pressed frame correlation coefficient Coef
xCarry out the frame correlation computations, the combination picture C (t) after obtaining merging, namely
7. described spatial compound imaging method according to claim 6 is characterized in that described steps A specifically comprises:
Combination picture C (t) is divided into a plurality of zoness of different according to the overlapping situation of scanning, calculates the information slip that zones of different is scanned according to deflection angle;
According to the scanning frame per second of each scanning area under each deflection angle, calculate the interval Δ t that each zone is being scanned for continuous 2 times;
According to interval Δ t, calculate the frame correlation coefficient of each zones of different under deflection angle x scanning
;
Wherein, when a zone was not scanned, frame correlation coefficient directly got 1;
Be exponential function
, k is the control parameter.
8. described spatial compound imaging method according to claim 6 is characterized in that described step B specifically comprises:
To scanogram A
x(t) resample, obtain scanogram A
x(t) value of correspondence each pixel D in combination picture C (t);
To the image A after resampling
x(t) the combination picture C (t-1) with the last scan period carries out the frame correlation computations, obtains combination picture C (t),
9. described spatial compound imaging method according to claim 8 is characterized in that described step B also comprises: combination picture C (t) is upgraded in image storage.
10. a spatial compound imaging system is characterized in that, described system comprises at least: be used for storage of complex image C (t) image storage; Be used for storage frame correlation coefficient Coef
xThe frame correlation coefficient memorizer; The fused controlling unit; The image co-registration unit; Carry out spatial compound imaging by fused controlling unit controls image co-registration unit by any one described spatial compound imaging method of claim 6-9.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103584882A (en) * | 2012-08-13 | 2014-02-19 | 深圳市蓝韵实业有限公司 | Spatial compound imaging method and device and ultrasonic imaging system |
| CN104586433A (en) * | 2015-02-02 | 2015-05-06 | 声泰特（成都）科技有限公司 | Imaging method combining fundamental wave/harmonic wave fusion with space compounding based on frequency conversion |
| CN112150370A (en) * | 2019-06-28 | 2020-12-29 | 深圳市恩普电子技术有限公司 | Space compound imaging method and device |
| CN117503205A (en) * | 2024-01-05 | 2024-02-06 | 广州索诺康医疗科技有限公司 | Space composite imaging method, system, medium and terminal based on palm super equipment |
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| CN101866480A (en) * | 2009-04-15 | 2010-10-20 | 深圳迈瑞生物医疗电子股份有限公司 | Frame correlation processing method and system in spatial compound imaging |
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| US6733458B1 (en) * | 2001-09-25 | 2004-05-11 | Acuson Corporation | Diagnostic medical ultrasound systems and methods using image based freehand needle guidance |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103584882A (en) * | 2012-08-13 | 2014-02-19 | 深圳市蓝韵实业有限公司 | Spatial compound imaging method and device and ultrasonic imaging system |
| CN104586433A (en) * | 2015-02-02 | 2015-05-06 | 声泰特（成都）科技有限公司 | Imaging method combining fundamental wave/harmonic wave fusion with space compounding based on frequency conversion |
| CN112150370A (en) * | 2019-06-28 | 2020-12-29 | 深圳市恩普电子技术有限公司 | Space compound imaging method and device |
| CN112150370B (en) * | 2019-06-28 | 2024-02-06 | 深圳市恩普电子技术有限公司 | Space compound imaging method and device |
| CN117503205A (en) * | 2024-01-05 | 2024-02-06 | 广州索诺康医疗科技有限公司 | Space composite imaging method, system, medium and terminal based on palm super equipment |
| CN117503205B (en) * | 2024-01-05 | 2024-04-09 | 广州索诺康医疗科技有限公司 | Space composite imaging method, system, medium and terminal based on palm super equipment |
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