TW559673B - Compounding method for reducing speckle noise - Google Patents

Abstract

A compounding method for reducing speckle noise applied in an ultrasound imaging apparatus is disclosed. The compounding method includes the steps of providing an object, measuring the object for obtaining a reference image by the ultrasound imaging apparatus, applying an external force to the object to deform the object, measuring the deformed object for obtaining a deformed object image at the same position, estimating an in-plane displacement field of the deformed object image for correcting an in-plane motion of the object to obtain a corrected image, and compounding the reference image with the corrected image to obtain a compounded image of the object for achieving the speckle noise reduction.

Description

559673 V. Description of the Invention (i) Field of the Invention The present invention relates to a composite method for reducing speckle noise, and more particularly to a composite method for reducing speckle noise applied to a super-theta wave imaging device. BACKGROUND OF THE INVENTION The contrast resolution of a coherent imaging system is severely reduced due to the appearance of speckles. Speckles are the result of phase interference 'and appear as random speckles superimposed on the image. Therefore, 'speckle reduction is particularly important in diffraction-restricted ultrasound imaging systems. 0 At the point of homology can be reduced. In addition, the reduction of the speckle pattern in space can be achieved from different angles of the target object and the decorrelation. . Speckle reduction in optical or acoustical images. These methods are reduced, including spatial recombination and frequency recombination. Both the frequency recombination method and the frequency recombination method attempt to achieve speckle by increasing the decorrelation (d e c 0 r r 1 a t i ο η) between the same objects. In terms of spatial compounding, speckle decorrelation is achieved by extracting images of the same target object. That is, when the distance between the converters of the image device is changed, the speckles are increased. On the other hand, in terms of frequency recombination method, the recombination method is to reduce the _ Λ in the image by increasing the de-correlation method by using the composite method of capturing the same target object in different frequency ranges. The price of reducing speckle noise is space

559673 5 The spatial resolution is greatly reduced. Using the spatial reentry method: the resolution between $ will be reduced by measuring the size of the target object from different angles: first j size. Similarly, in the frequency recombination method, the resolution will be reduced due to the frequency bandwidth generated by the pulse wave lengthening. Therefore, there is a need to develop a composite method to deal with the above-mentioned conventional techniques; a comprehensive description of the invention. Therefore, the dephasing between the speckle brightness of the low image of the present invention and the other device number of the present invention is reduced according to the imaging device of the present invention. Spots: Provide an object, a reference image, apply a deformed object to get the image of the deformed object moving in the flat plane to obtain a corrected image to get the reduction. Better, the superset. One goal is to provide a composite approach to change. The purpose is to provide a form of compounding that reduces speckle hybrids at different resolutions with less resolution. The present invention provides a compounding method suitable for point noise by applying external force to the object from the ultrasonic device. In-plane one at the same position—correct the image and a composite image of one of the objects. The composite side measures the object, the object is deformed, and the image of the object is shifted to correct the composite reference to achieve the speckle-reducing state. The ultrasonic method includes the steps of obtaining one, measuring the 'estimated image of the object and the point of noise. The acoustic imaging device is a medical diagnostic ultrasonic device. Page 6 559673 5. Description of the invention (3) The better one , (Organ). Preferably, the composite image is composed of a plurality of tissue images, a tissue, or an organ, the reference of which is a pixel element and a complex number of each of the corrected images. According to another form of the wave imaging device of the present invention, Steps for reducing speckles: The first time, the second and the second provide a time-by-time image, the pre-image first image and the noise are better, the body shadow is the object and the spot is more aligned. Compared with the composite image, the dots naturally deform the first image, and the second object image is measured to estimate that the corrected image in the first plane is reduced. The supersonic image, the deformed plurality of pixels are grouped by each of the relevant pixels, and the composite object of this issue is the amount of the object, of which the two images are moved and the image is obtained to obtain the object image. Compared with the parameter average. Ming provides methods. 'Measuring the volume to obtain the second in-plane image' For those who have a good corrected image, each complex image of the re-examination image is suitable for supersonic methods including obtaining a corrected image of one of the objects, and the composite of the objects must be in phase. The image is a displacement area image. A composite image is used to obtain the deformed object domain at the same position to correct and composite the image to achieve the best. The best is a complex pixel of each image. Each of the corrected images is based on the device. The device The wave imaging device is a medical diagnostic ultrasonic device. The object contains a tissue, or an organ. The first image of Tun Hai, Xi Di—the first shirt image of the male, the corrected image and the image are composed of a plurality of pixels. The average of the plurality of pixels of the complex image of the first image, which is related to the sword, is more than the image of the complex image. The number of pixels and = again: The present invention provides-a type of ultrasound imaging, to measure an object to obtain a first

559673 V. Description of the invention (4) A reference image of a position, and measuring the deformed object to obtain a deformed object image at the position, and a processor for predicting movement in a plane of the deformed object image to A correction image is obtained, the reference image and the correction image are combined to obtain a composite image of the object to reduce speckle noise, and a signal of the composite image is output. Preferably, the ultrasonic imaging device is a medical diagnostic ultrasonic device. Preferably, the system comprises a tissue, or an organ. Preferably, the deformation of the object is caused by the application of external force or occurs naturally. Preferably, the reference image, the deformed object image, the corrected image and the composite image system are respectively composed of a plurality of pixels. Preferably, the plurality of pixels of each composite image is an average of the plurality of pixels of each related reference image and the plurality of pixels of each corrected image. Preferably, the ultrasonic imaging device further includes a device for receiving the signal of the composite image, wherein the device is a display or a printer. The present invention will be effectively understood through the following description with reference to the accompanying drawings, in which: y is a brief description of the first diagram. The first diagram is a flowchart of a preferred embodiment of the composite method for reducing speckle noise according to the present invention;

559673 V. Description of the invention (5) The first diagram A to the first diagram β are diagrams of the steps for estimating the in-plane displacement of the present invention; the third diagram is the comparison between the resolution of the present invention and the resolution of the conventional compound method The fourth diagram is a functional block diagram of the ultrasonic imaging device of the present invention; ^ The fifth diagram A to the fifth diagram B are thyroid (thyroid) images before and after compounding of the preferred embodiment of the present invention Bis image. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described with reference to the following examples. It should be noted that the following description of the preferred embodiments of the present invention is presented here for illustration and description only; it is not intended to offset or be limited to the precise form disclosed. The first figure is a flowchart of a preferred embodiment of the composite method for reducing speckle noise according to the present invention. First, an object, taking human tissue as an example, obtains a reference image by using an ultrasound imaging device. Secondly, the object & is compressed by an external force at the same position and measured to obtain a deformed object image 11. Next, the deformed object image n is compared with the reference image 10 = the estimated in-plane displacement area, and then the object movement is corrected to obtain a corrected image 12. Finally, the corrected image 12 is compared with the reference image > 10 in order to obtain a comparative image 3 of one of the objects. The composite step is a relative measurement, which is an incoherent average. In addition, if you save: measure the value of the second test, the same procedure can be repeated, and the change in spot brightness can be reduced in one step. Enter

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narrow. : 7 Bu, to produce a one-to-three correction to ensure that 1 1 in the image flat image of the movement of the deformation of the shadow of the projected object is estimated to have a low correlation between the reduction of lighting and the reduction of this' when using in-plane movement can be like Therefore, when the node is low-relevant and when the issue occurs, the object is deformed. The following will chase the present invention. If the area is not used, use the pre-second diagram as the external force dimension to move. The reference shadow plane is between the two-dimensional speckle images 11. Depending on the other side. Degree change. Conflicts can be accurately predicted by a small increment. By combining multiple speckles, the brightness and brightness can be one, as shown in the example of the jump. Participating in the block matching is to find the estimated motion, and the original shadow is applied. Therefore, like 10 and the south face of the matching point chase, in other words, however, when implemented, the two estimates. The change from the adjacent incremental points can be approached to the object, which should be used. For the advance. In the pre-complexity period, it is necessary to correctly multiply the adjacent shadows. A large number of pre-separated shadows can be effectively applied to organs or a tissue heart. Then the above method can be described in one step. When the composite image is called a reference volume, the in-plane movement of the image is based on the composite estimation plane, which is necessary during the estimation period. The lower pre-compression image with the lower speckle is the higher compression image when the image is shifted. Medical consultation. However, the implementation of the external motion prediction is omitted, and the forward image in the plane is better. The object must be moved by the deformed object, and the reference image is used to obtain the point reduction value. The correlation value is estimated to be effective and the resolution is related. The discontinuous ultrasound that can be obtained by the accumulation of the separated dynamics is used as an example of the application of the physical force for the purpose of correction. The two-dimensional object moves in space and is estimated in different deformations. Positive cancer is obtained by relying on spot 0 which is effective for two reasons. When the spot is set, the body can help from 0% to the spot. This match. Such as stress

559673 V. Description of the Invention (7) __— The image of a ^ -shaped object is called a comparison image. The & | are all composed of a plurality of pixels (i% test shirt image and the comparison image element and the 1 around the pixel. The area block 20 is related to the comparison image in the comparison image. The match Compare. In the comparison image, select this area; select each of the search windows 22: meaning-search window 22. Time-correlation coefficient. In the comparison video; middle: 2 2 ° f candidate block 21 It is regarded as the best match. Therefore, the original image and the object displacement in the comparison shadow plane of the reference image in the pixel image of the ^^^ relationship are defined as the estimated target pixel = corrected. In addition, this procedure is continued: i until the displacement area of all pixels in the reference image is obtained. In addition, the three-dimensional object movement generated by the object deformation is transformed by the punctuation points &, 7, 2) to the new position (^ ', 7', 2 ') and description. The relationship between the two positions and the following equations 〃 (X ', y ,, z') αχ, βγ, γ z (3) If the object is incompressible, the total volume of the image object must be fixed and not changed. In other words, the product of the three scale factors must be i, that is, α 7 = work leave δ and another object to the tissue is compressed in the direction of stress 1 — α. Β 7 a -ο. (4) page 11 559673 assumption Using only two images of the full man, the pottery s-mountain boundary < complex 0 does not show a change in spatial resolution to (l + α _1) / 2. The three pictures are the drawings of the comparison of conventional techniques. The relationship between them is the composite method of 1 zed sample technique in spatial resolution, which is shown by the dashed sample volume size and the solid line represents bar). As the relationship between the number and the part usually, the correlation between the two starting dimensions is poor. The result of the composite method is reduced in terms of the degree of loss of conventional techniques. The wave imaging device debt detector 41, the detector 41 is a deformation system with a deformed object used to estimate the first resolution resolution table, and (the norma technique is linearly low, and the three graphs (error is lower than the dotted line). The loss in the resolution is related. Therefore, the fourth image generated by the method is as shown in the fourth image, and the display 43 or a variable force that obtains the same position of a position or a combination of natural production techniques is used to simulate the spot in which Change the phase represented by the volume). Add to the original invention-a standard word, in the case of the invention has a significantly more supersonic sound than the spatial parsing of the invention with the same spatial resolution. The device includes a print Machine 44. This method detects a reference image and measures the shape of the image of the object. Obtained. The reduction power and space force of the composite method shown in Fig. 4 are shown in the three figures of the correlation coefficient instead of the volume. 0 times. In addition, if the number is the same, and the error bar shows that the solid line obviously has the same phase of the low spatial recombination method, the functional block diagram of the compound of the present invention. Management Is 4 2, one to measure an object and to obtain

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Shift 1 field in the plane to correct the in-plane movement of the object @ to obtain a correction image, combine the reference image and the corrected image to obtain a composite image of the object, and output the signal of the composite image. The signal of the composite image can be output to the display 43 or the printer 44. Therefore, the composite image can be displayed on the display 43 or printed out by the printer 44. The fifth graph A to the fifth graph b show thyroid images before and after the combination according to the preferred embodiment of the present invention. The fifth picture A is the image of the sacral gland (τ), cervical vein (J) and carotid artery (C). The fifth figure 6 is an image of the fifth figure A by the method of the present invention. Comparing the shadows between 58 and 56, the speckle noise is significantly reduced and no significant decrease in spatial resolution can be observed. Therefore, the composite method of the present invention can be used for diagnosing ultrasound to improve it. Low contrast detection (low contrast detection). The present invention can also be applied to other imaging systems (imaging aljty) with image speckles. The present invention utilizes the autonomy between signals under different stress states to further To reduce speckle noise, the stress can be generated by external force or by: Ϊ ΐ. When this external force is applied to the object, & Generate two-dimensional object movement, such as tissue movement, and obtain deformed physical force Zhuang II image. However, by only correcting the movement in the two-dimensional plane, the images under different conditions (out: have the same characteristics, except for the speckle caused by the uncorrected outward movement of the plane image = f ~ plane) Out of appearance. Therefore, the 1 shadow solution can be combined to reduce speckles without seriously affecting the low space in the plane and S 3. The composite method of the present invention can reduce the low spatial resolution. Noise change in brightness. Therefore, when the present invention is applied to diagnosis

559673 V. Description of the Invention (" ----- Ultrasonic Time ') can improve low contrast detection. In addition, the method of the present invention can be implemented by free hand scanning. Although the present invention is described in accordance with the currently recognized most practical and preferred embodiments, it can be understood that the present invention is not limited to the disclosed > ::: and different modifications and similar devices, and The broadest interpretation of all such modifications and similar structures of the K's Dagger 3-Qianwei and 559673

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Claims (1)

559673 6. The method of applying patents for a method for reducing speckle noise in an ultrasonic imaging device includes the steps of: providing an object; measuring the object with the ultrasonic device to obtain a reference image; applying an external force to the object To deform the object; measuring the deformed object to obtain an image of a deformed object at the same position; , Estimating an in-plane displacement area of the deformed object image to correct a movement in an image plane of the object to obtain a corrected image; and ^ combining the reference image and the corrected image to obtain the object A composite shirt image reduces the speckle noise. 2. The composite method according to item 1 of the patent application range, wherein the ultrasonic imaging device is a medical diagnostic ultrasonic device. Three people apply for the composite method of item No.}, wherein the material system is selected from the group consisting of a tissue and a group of organs. 4. The composite method according to item 丨 of the patent application, wherein the reference image, ′ = a shaped object scene image, the corrected scene image and the composite f image are composed of a plurality of pixels, respectively. 5 ·: The composite method of item 4 of the “Range of Benefits”, wherein each of the “complex” pixels is a mother-related reference number of the reference image, and the mother-related average pixel number of the corrected image. -6 books-2 speckle reduction method for ultrasonic imaging devices, including steps: Sigh is page 16 559673 /, patent application scope Provide a &amp; deformed object; Measure the object to get the measurement This object is one of the 4K images of the corpse, a body image, in which Xi #obtains a second object in the same position a second time, and the second image of the younger brother is the image of the wild animal. Predict the number; Cen # + / historical object ~ home to correct the object 象 ~ in-plane displacement area and objects in the shirt image plane <-— moving in the image plane to obtain a corrected image; Combine the first ~ once you also fight the &gt; image to achieve the &amp; ~ image and cross the positive image to obtain one of the objects. 7. Ru Shen Ϊ; ": Noise reduction. The device is a medical method 'which The ultrasound imaging 〇, _ ^ break the ultrasound device. 1 If the patent application diagram $ β human containing-tissue and 4 6 members of the 5 method, wherein the system from package 9. If the patent application = Guangzhi: The second one is selected. The second practice # ♦ The compound method surrounding item 6, wherein the first The image, the set of orthogonal images and the composite image are composed of a plurality of pixels J, such as the second method of the 9th patent, where each-the composite image J element is each related to the first image The average of the plurality of pixels and the plurality of pixels of the corrected image related to the mother. 1 1 · An ultrasonic imaging device comprising: a detector for measuring an object to obtain a parameter of a first position ^ 'and measuring the A deformed object to obtain an image of the two-shaped object in the set; and a processor for estimating an image plane of the deformed object image Page 17 559673 VI. Apply for a patent (in-plane) to move the area to obtain-correction and the correction image to obtain one of the object &amp; composite reduction, and output one signal of the composite image = shirt image to reach 12. If the ultrasound imaging device of item n in the scope of the patent application is a medical self-imaging device, 1 ^^ 1 Yizi ° ultrasound device. Ultrasonic imaging kit # 3 of the patent scope-tissues and a group of organs, please request ultrasound imaging of the u scope of patent =-the deformation is caused by the application of an external force and naturally occurring ^, = The ultrasonic imaging device of the 11th scope of the patent application; the deformed object image, the corrected image and the human body are composed of a plurality of pixels. 6 16 If the ultrasonic imaging method of item 15 of the scope of the patent application is applied, each of the plurality of complex pixels in the composite image is each relevant complex pixel and each relevant corrected image pixel ^ 17. If the scope of patent application is 11th The ultrasonic imaging device of Xiang Xiang is used to receive the signal of the composite image, and one of the device and a printer. 1 The reference image is speckle noise, where the super is in the object. Where the object is produced. The reference image is an average of each of the reference images. , And more