CN103584882A - Spatial compound imaging method and device and ultrasonic imaging system - Google Patents

Spatial compound imaging method and device and ultrasonic imaging system Download PDF

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CN103584882A
CN103584882A CN201210286386.8A CN201210286386A CN103584882A CN 103584882 A CN103584882 A CN 103584882A CN 201210286386 A CN201210286386 A CN 201210286386A CN 103584882 A CN103584882 A CN 103584882A
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image
angle
coef
deflection
spatial compound
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王勇
张羽
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Shenzhen Landwind Industry Co Ltd
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Abstract

The invention discloses a spatial compound imaging method and device and an ultrasonic imaging system. The spatial compound imaging method comprises the steps of generating a combination coefficient Coefx according to preset parameters; performing resampling on existing deflection image and converting the existing deflection image into a zero-angle image Ax(t) in a coordinate system; reading a result image C(t-1) of the previous spatial compound imaging; utilizing the combination coefficient Coefx to respectively perform multiplied weighting calculation on the result image C(t-1) of the previous spatial compound imaging and the zero-angle coordinate space image Ax(t) obtained through resampling of the existing deflection image to obtain a weighted compound image Coefx*C(t-1) and a weighted angle image (1-Coefx)* Ax(t), performing summation of the weighted compound image and the weighted angle image to obtain a result image C(t) of the existing spatial compound imaging. The multiple-angle spatial compounding is achieved by adopting frame correlation methods, and by combining spatial compounding and time compounding, boundaries caused by different-angle images are effectively inhibited, and image degradation caused by angle deflection is reduced.

Description

Spatial compound imaging method, device and ultrasonic image-forming system
Technical field
The present invention relates to a kind of Medical Image Processing, especially relate to spatial compound imaging method and device in a kind of ultrasonic image-forming system.
Background technology
From eighties of last century, since the eighties, along with the development of supersonic imaging apparatus and electronic technology, the quality of ultrasonic B image is greatly improved, and has occurred various scanning techniques, signal processing technology and image processing techniques.
Multi-angle space compound technology is exactly a kind of effective ways that improve Type B picture quality in conjunction with scanning technique, signal processing and image processing techniques.This technology is different from pure image and processes, it is to carry out multi-angle scanning and reception at front end, different angles image is carried out to signal processing and obtain ultrasonoscopy, then in image processing links, different angles image is carried out data fusion and obtains the new images that a width comprises multi-angle scanning information, therefrom can find out that space compound is by processing to obtain a two field picture to the multiple image of different angles scanning in time series.And the processing of general image is only carried out the processing on space to single-frame images, on image, by enhancing, give prominence to structure, by smoothly suppressing speckle noise (Speckle Noise), thus the display effect of raising image.
Space compound technology is also different from frame correlation technique, although frame correlation technique is also that a series of time-series images are carried out to relevant treatment, strengthens signal, suppresses electronic noise.Because multiple image is same scanning direction, can not suppress speckle noise.And multi-angle space compound technology is compared the advantage that has self with image processing techniques and frame correlation technique, image information is truer, abundant.
General Spatial complex technique merges the compound frame realizing to a plurality of angle-datas, due to 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, take three two field pictures carries out space compound as the specific implementation of example explanation prior art.
As shown in Figure 1, the compound two field picture that obtains of image of three frame different angles scannings, image after compound has four regions, a-quadrant comprises three frame image informations, B district inclusion two frame image informations, C only has in region the information of 0 angle two field picture (image obtaining along the scanning of probe face normal direction, the coordinate system of this image is just the coordinate space of 0 angle).This can cause the level of zones of different electronic noise different, and some noise regions are large, and some noise regions are 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 decline, and even can produce some pseudomorphisms.
Summary of the invention
The defect existing for solving prior art, the present invention proposes a kind of spatial compound imaging method, device and ultrasonic image-forming system that adopts multi-angle scan-data to merge, embodying combination picture inhibition speckle noise, weakening outside the advantage of the aspects such as sound shadow, make the image after compound comprise more useful informations, and improve to a certain extent the fuzzy problem of conventional multi-angle compound motion.
The present invention adopts following technical scheme to realize: a kind of spatial compound imaging method, and it comprises step:
According to preset parameter, generate recombination coefficient Coef x;
Current deflection image is resampled, current deflection image is converted to the image A under the coordinate system of 0 angle x(t);
Read the result images C (t-1) of spatial compound imaging last time;
Utilize recombination coefficient Coef xrespectively to last time spatial compound imaging result images C (t-1) and to the resample coordinate space image A of 0 angle that obtains of current deflection image x(t) weighted calculation multiplying each other respectively, obtains weighting combination picture coef x* C (t-1) and weighting angular image (1-Coef x) * A x(t), and to weighting combination picture and weighting angular image sue for peace and obtain the result images C (t) of this spatial compound imaging.
Wherein, the described step that current deflection image is resampled comprises:
Current deflection image is carried out to space conversion and interpolation, each point that is about to 0 angle coordinate and is on image is transformed in deflection coordinate system, obtain this consecutive points in deflection coordinate system, with consecutive points, carry out interpolation, thereby obtain the numerical value of this point, deflection image converts the image A under the coordinate system of 0 angle to the most at last x(t).
Wherein, described syzygy number Coef xbe defined as the function that image-region is scanned interval,, in the deflection scanning of different angles, the interval Δ t that imaging zones of different is scanned is different, thereby according to different interval Δ t, obtains different recombination coefficients and count Coef x:
Figure BDA00002002437200031
Wherein, described method also comprises step:
When current deflection image is resampled, use border inhibition function to image A x(t) noise at the boundary suppresses to process.
Wherein, described method also comprises step:
When current deflection image is resampled, to low-angle, scanning increases complex weight, and for wide-angle, scanning reduces weight, i.e. A ' x(t)=weight x* A x(t), weight wherein xfor the weight coefficient relevant to deflection angle.
Wherein, described method also comprises step:
Result images C (t) is further carried out to coefficient normalized,
C ( t ) = Coef x ′ * C ( t - 1 ) + ( 1 - Coef x ′ ) * A x ( t ) Coef x ′ + ( 1 - Coef x ′ ) * mask x ( t )
Mask wherein x(t) be angle mask, so-called angle mask refers to for imaging point to be composite, by this deflection scanning to place put 1, the place not scanning sets to 0.
In addition, the present invention also discloses a kind of spatial compound imaging device, and described device comprises:
Recombination coefficient generation module, for generating recombination coefficient Coef according to preset parameter x;
Resampling module, in realtime imaging process, produces current deflection image to image generation module and carries out space conversion and interpolation, current deflection image is converted to the image A under the coordinate system of 0 angle x(t);
Combination picture read module, for reading the result images C (t-1) of spatial compound imaging last time;
Weighted calculation module, after the resampling completing deflection image, uses recombination coefficient Coef xrespectively to last time spatial compound imaging result images and to the resample coordinate space image A of 0 angle that obtains of current deflection image x(t) weighting of multiplying each other respectively, obtains weighting combination picture Coef x* C (t-1) and weighting angular image (1-Coef x) * A x(t), and to weighting combination picture and weighting angular image sue for peace and obtain the result images C (t) of this spatial compound imaging.
Wherein, by resampling module, use border inhibition function to image A x(t) noise at the boundary suppresses to process, and scanning increases complex weight to low-angle, and for wide-angle, scanning reduces weight, i.e. A ' x(t)=weight x* A x(t), weight wherein xfor the weight coefficient relevant to deflection angle.
Wherein, by weighted calculation module, result images C (t) is further carried out to coefficient normalized,
C ( t ) = Coef x ′ * C ( t - 1 ) + ( 1 - Coef x ′ ) * A x ( t ) Coef x ′ + ( 1 - Coef x ′ ) * mask x ( t )
Mask wherein x(t) be angle mask, so-called angle mask refers to for imaging point to be composite, by this deflection scanning to place put 1, the place not scanning sets to 0.
Moreover, the present invention also discloses a kind of ultrasonic image-forming system, comprise that multi-angle image fused controlling unit, sweep parameter generation unit, scan control circuit, scanning line form module, digital signal processing module, image generation module, image storage, display processing unit, it is characterized in that, also comprise: described spatial compound imaging device, it is connected between image storage and display processing unit.
Compared with prior art, the present invention has following beneficial effect:
The present invention uses frame correlation technique to realize the space compound of multi-angle, by space compound and time compound phase combination, suppress electronic noise and acoustics speckle noise simultaneously, and increased line weighting, the normalization of frame weighted sum coefficient in image co-registration link, effectively suppress border that different angles image causes, reduced angular deflection and the image deterioration that causes.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of prior art to three two field picture Combined Processing;
Fig. 2 is the structural representation of compuscan of the present invention the 1st embodiment;
Fig. 3 is the structural representation of image co-registration module in Fig. 2;
Fig. 4 is the mask schematic diagram of a frame deflection image;
Fig. 5 is the structural representation of compuscan of the present invention the 2nd embodiment;
Fig. 6 is the structural representation of image co-registration module in Fig. 5.
The specific embodiment
In compuscan (being designated hereinafter simply as " system "), the sweep parameter that transmits and receives passage by control can realize the deflection of scanning line, as shown in Figure 2.Under the control of multi-angle image fused controlling unit, by sweep parameter generation unit, generated successively the sweep parameter of different scanning direction; Under each scanning direction, scan control circuit is controlled and is transmitted and received scanning by sweep parameter; At scanning line, forming module merges and forms scanning line channel data; By digital signal processing module, every scanning line is carried out to Digital Signal Processing, obtain the echo information of object; By image generation module, according to the echo information of object, generated the deflection image of object, and the deflection image of generation is deposited in image storage; By the image co-registration module angular image that scanning obtains to different angles, merged, and deposit the image after merging in image storage in order to follow-up fusion, image after merging is outputed to display processing unit simultaneously, after processing through scanning coordinate spatial alternation (DSC, Digital Scan Converter), on display, export multi-angle fusion image.
Wherein, image co-registration module is the nucleus module of spatial compound imaging, and the angular image current scanning being obtained in this image co-registration module resamples, and obtains the coordinate space image of 0 angle, this image co-registration, in the space compound result of last time, is obtained to new space compound image.
As shown in Figure 3, solid line is partly image co-registration inside modules structure.Image co-registration module specifically comprises: the recombination coefficient generation module being connected with multi-angle image fused controlling unit, after startup is compound, multi-angle image fused controlling unit initializes image storage, and the preset parameter being provided according to multi-angle image fused controlling unit by recombination coefficient generation module generates recombination coefficient Coef x; The resampling module being connected with image generation module, in realtime imaging process, image generation module produces current deflection image, by resampling module, current deflection image is carried out to space conversion and interpolation, each point that is about to 0 angle coordinate and is on image is transformed in deflection coordinate system, obtains this consecutive points in deflection coordinate system, with consecutive points, carries out interpolation, thereby obtain the numerical value of this point, the most current deflection image converts the image A under the coordinate system of 0 angle to x(t); The combination picture read module being connected with image storage, for reading the result images of spatial compound imaging last time; Weighted calculation module, after the resampling completing deflection image, uses recombination coefficient Coef xrespectively to last time spatial compound imaging result images and to the resample coordinate space image A of 0 angle that obtains of current deflection image x(t) weighting of multiplying each other respectively, obtains weighting combination picture Coef x* C (t-1) and weighting angular image (1-Coef x) * A x(t), and weighting combination picture and weighting angular image are sued for peace and obtained the result images C (t) of this spatial compound imaging,
C(t)＝Coef x*C(t-1)+(1-Coef x)*A x(t)
Compound result C (t) is carried out to display process output, store this compound result to image storage simultaneously and prepare against next compound use.
In image co-registration module, recombination coefficient generation module and with recombination coefficient to last time spatial compound imaging result images and this deflection image to carry out frame related compound imaging processing be key of the present invention.
This programme adopts the frame correlation technique of unlimited frame to come implementation space compound, that is:
C(t)＝Coef x*C(t-1)+(1-Coef x)*A x(t)，
The result images that wherein C (t) is this spatial compound imaging, C (t-1) is the result images of spatial compound imaging last time, Coef xfor correlation matrix (being recombination coefficient), this matrix size is identical with image size, A x(t) be the current deflection image after resampling.
Wherein, the recombination coefficient Coef of generation xaffect final image quality, specifically can application reference people before another patent application of application, its application number is CN201110246045.3, in this patent application, recombination coefficient is counted Coef xbe defined as the function that image-region is scanned interval,, in the deflection scanning of different angles, the interval Δ t that imaging zones of different is scanned is different, thereby according to different interval Δ t, obtains different recombination coefficients and count Coef x:
Figure BDA00002002437200071
The present invention has carried out 3 improvement to the method:
1, be improved to and increase border inhibition, because the speckle noise pattern of different angles scanogram is different, if do not carry out border elimination, in image C (t) after compound, can produce obvious boundary line, in order to suppress this impact, need to suppress border, after suppressing, image just becomes:
A′ x(t)＝fun(j)A x(t)，
Wherein fun (j) is border inhibition function, and j is scanning wire size, and border inhibition function can be linear function, can be also other functions.
2, be improved to and suppress the image deterioration that deflection scanning causes, to low-angle, scanning increases complex weight, and for wide-angle, scanning reduces weight.
A ' x(t)=weight x* A x(t), weight wherein xfor the weight coefficient relevant to deflection angle.
3, be improved to and increase coefficient normalization link:
C ( t ) = Coef x ′ * C ( t - 1 ) + ( 1 - Coef x ′ ) * A x ( t ) Coef x ′ + ( 1 - Coef x ′ ) * mask x ( t )
Coef ' wherein xfor recombination coefficient, mask x(t) be angle mask, so-called angle mask refers to for imaging point to be composite, by this deflection scanning to place put 1, the place not scanning sets to 0, if Fig. 4 is the mask of a frame deflection image, the region in solid line puts 1, and the region between solid line and dotted line sets to 0.
As shown in Figure 5 and Figure 6, the present invention also provides another to realize example, by display processing unit (DSC, spacescan conversion) before being placed in image co-registration module, so in image co-registration module, with regard to not needing, image is resampled, just do not need the module that resamples, and directly utilize recombination coefficient to be weighted, reduced like this processing links yet.
To sum up, the present invention uses frame correlation technique to realize the space compound of multi-angle, by space compound and time compound phase combination, suppress electronic noise and acoustics speckle noise simultaneously, and increased line weighting, the normalization of frame weighted sum coefficient in image co-registration link, effectively suppress border that different angles image causes, reduced angular deflection and the image deterioration that causes.
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 (10)

1. a spatial compound imaging method, is characterized in that, described method comprises step:
According to preset parameter, generate recombination coefficient Coef x;
Current deflection image is resampled, current deflection image is converted to the image A under the coordinate system of 0 angle x(t);
Read the result images C (t-1) of spatial compound imaging last time;
Utilize recombination coefficient Coef xrespectively to last time spatial compound imaging result images C (t-1) and to the resample coordinate space image A of 0 angle that obtains of current deflection image x(t) weighted calculation multiplying each other respectively, obtains weighting combination picture Coef x* C (t-1) and weighting angular image (1-Coef x) * A x(t), and to weighting combination picture and weighting angular image sue for peace and obtain the result images C (t) of this spatial compound imaging.
2. spatial compound imaging method according to claim 1, is characterized in that, the described step that current deflection image is resampled comprises:
Current deflection image is carried out to space conversion and interpolation, each point that is about to 0 angle coordinate and is on image is transformed in deflection coordinate system, obtain this consecutive points in deflection coordinate system, with consecutive points, carry out interpolation, thereby obtain the numerical value of this point, deflection image converts the image A under the coordinate system of 0 angle to the most at last x(t).
3. spatial compound imaging method according to claim 1, is characterized in that described syzygy number Coef xbe defined as the function that image-region is scanned interval,, in the deflection scanning of different angles, the interval Δ t that imaging zones of different is scanned is different, thereby according to different interval Δ t, obtains different recombination coefficients and count Coef x:
Figure FDA00002002437100011
4. spatial compound imaging method according to claim 1, is characterized in that, described method also comprises step:
When current deflection image is resampled, use border inhibition function to image A x(t) noise at the boundary suppresses to process.
5. spatial compound imaging method according to claim 1, is characterized in that, described method also comprises step:
When current deflection image is resampled, to low-angle, scanning increases complex weight, and for wide-angle, scanning reduces weight, i.e. A ' x(t)=weight x* A x(t), weight wherein xfor the weight coefficient relevant to deflection angle.
6. spatial compound imaging method according to claim 1, is characterized in that, described method also comprises step:
Result images C (t) is further carried out to coefficient normalized,
C ( t ) = Coef x ′ * C ( t - 1 ) + ( 1 - Coef x ′ ) * A x ( t ) Coef x ′ + ( 1 - Coef x ′ ) * mask x ( t )
Mask wherein x(t) be angle mask, so-called angle mask refers to for imaging point to be composite, by this deflection scanning to place put 1, the place not scanning sets to 0.
7. a spatial compound imaging device, is characterized in that, described device comprises:
Recombination coefficient generation module, for generating recombination coefficient Coef according to preset parameter x;
Resampling module, in realtime imaging process, produces current deflection image to image generation module and carries out space conversion and interpolation, current deflection image is converted to the image A under the coordinate system of 0 angle x(t);
Combination picture read module, for reading the result images C (t-1) of spatial compound imaging last time;
Weighted calculation module, after the resampling completing deflection image, uses recombination coefficient Coef xrespectively to last time spatial compound imaging result images and to the resample coordinate space image A of 0 angle that obtains of current deflection image x(t) weighting of multiplying each other respectively, obtains weighting combination picture Coef x* C (t-1) and weighting angular image (1-Coef x) * A x(t), and to weighting combination picture and weighting angular image sue for peace and obtain the result images C (t) of this spatial compound imaging.
8. spatial compound imaging device according to claim 7, is characterized in that, by resampling module, uses border inhibition function to image A x(t) noise at the boundary suppresses to process, and scanning increases complex weight to low-angle, and for wide-angle, scanning reduces weight, i.e. A ' x(t)=weight x* A x(t), weight wherein xfor the weight coefficient relevant to deflection angle.
9. spatial compound imaging device according to claim 7, is characterized in that, by weighted calculation module, result images C (t) is further carried out to coefficient normalized,
C ( t ) = Coef x ′ * C ( t - 1 ) + ( 1 - Coef x ′ ) * A x ( t ) Coef x ′ + ( 1 - Coef x ′ ) * mask x ( t )
Mask wherein x(t) be angle mask, so-called angle mask refers to for imaging point to be composite, by this deflection scanning to place put 1, the place not scanning sets to 0.
10. a ultrasonic image-forming system, comprise that multi-angle image fused controlling unit, sweep parameter generation unit, scan control circuit, scanning line form module, digital signal processing module, image generation module, image storage, display processing unit, it is characterized in that, also comprise: spatial compound imaging device as described in claim 7 or 8 or 9, it is connected between image storage and display processing unit.
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