CN107967670B - Spatial compound imaging method and system and ultrasonic imaging equipment - Google Patents
Spatial compound imaging method and system and ultrasonic imaging equipment Download PDFInfo
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Abstract
The application provides a space compound imaging method, a space compound imaging system and ultrasonic imaging equipment, wherein the method comprises the following steps: pre-scanning an object to be detected from an emission angle contained in a zero-angle emission angle and at least one deflection angle group; determining the angle values of a first deflection angle and a second deflection angle of at least one deflection angle group so as to enable the optimal image quality area and the signal-to-noise ratio of the image compositely imaged according to the zero-angle subframe image when the emission angle is the zero angle, the first subframe image when the emission angle is the first deflection angle and the second subframe image when the emission angle is the second deflection angle to meet the preset threshold condition; and scanning the object to be detected to obtain a zero-angle subframe image, a first subframe image and a second subframe image, and performing spatial compound imaging to obtain a compound image. The method and the device adaptively select the required deflection angle for scanning, and enable more subframe images to participate in composite imaging so as to obtain a larger optimal image quality area and signal-to-noise ratio and improve the quality of the composite image.
Description
Technical Field
The present application relates to the field of medical image processing technologies, and in particular, to a spatial compound imaging method and system, and an ultrasound imaging apparatus.
Background
The medical ultrasonic imaging system transmits ultrasonic waves to the inside of a human body, receives and detects echoes in the human body, and finally images, and the ultrasonic scanning can continuously and dynamically observe the movement and the function of the visceral organs and can also be combined with a Doppler technology to monitor the blood flow and the direction, so that the damaged properties and the degree of the visceral organs can be distinguished, and the equipment of the medical ultrasonic imaging system has the advantages of easy movement, no wound, no radiation and the like and is widely used.
The spatial compound imaging technology is an important technology in an ultrasonic imaging system, and the technology acquires a plurality of images by utilizing different deflection angles through multi-angle deflection scanning to compound an image in real time so as to enhance the echo continuity of a tissue and a lesion interface, reduce various artifacts such as specular reflection, speckle noise, scattering, attenuation, poor contrast and the like, and further obtain better image quality.
In practical system applications, after the probe is determined, the size of the deflection angle required for synthesizing the composite image is determined immediately, and cannot be intelligently adjusted according to other factors such as the scanning depth, for example, U.S. Pat. No. US 6126599A. Referring to fig. 1 to 4, fig. 1 and 2 are schematic diagrams of a three-frame image composite processing in a first scanning depth in a spatial composite imaging method in the prior art. Fig. 3 and 4 are schematic diagrams of a three-frame image composite processing in a second scanning depth by a spatial composite imaging method in the prior art. Here, taking three-frame images as an example, the spatial image compositing process needs to add and normalize the scanned images of the zero-angle sub-frame image 91, the first-angle sub-frame image 92, and the second-angle sub-frame image 93, and then composite the images to obtain one frame of image for display. The display area of the spatial composite image coincides with the zero-angle sub-frame image 91. The partial image quality where the three sub-frame images all overlap is the best, called the best image quality area (RMIQ: Region of Maximum Imagequality). Wherein the larger the proportion of the optimal image quality area occupying the space-time composite image display area (the area of the zero-angle sub-frame image 91) is, the better the overall quality of the image is.
It can be seen that the emission angle at the time of scanning of the probe 90 in fig. 1 and 2 is the same as the emission angle at the time of scanning of the probe 90 in fig. 3 and 4, but the scanning depth in fig. 3 and 4 is greater than that in fig. 1 and 2. In fig. 1 and 2, when the scanning depth is shallow, the composited image has three regions, and the region a contains three frames of image information and is the region with the best image quality; the B region contains two frames of image information. The proportion of the entire display image that is occupied by the optimum image quality area is large, about 1/2. Comparing the situation shown in fig. 3 and 4, when the scanning depth is deeper, the emission is performed at the same angle, which is θ 1, the compounded image has four areas, and the area a contains three frames of image information and is the area with the best image quality; the B area comprises two frames of image information; the C region has only zero angle subframe images. The proportion of the best image quality area to the entire display image is small, about 1/5, and the subframes on both sides of the middle and lower part of the image do not participate in compound imaging. Therefore, when the scanning depth of the screen display is deeper, the optimal image quality area is reduced by adopting the same angle emission, and the effect of the composite imaging on the overall image quality improvement is not obvious.
Disclosure of Invention
In view of the above problem, the present application provides a spatial compound imaging method, including:
pre-scanning an object to be detected from an emission angle contained in a zero-angle emission angle and at least one deflection angle group; the deflection angle group comprises a first deflection angle and a second deflection angle which are opposite in number;
according to the result of pre-scanning and the scanning environment parameters, determining the angle values of a first deflection angle and a second deflection angle of at least one deflection angle group, so that the optimal image quality area and the signal-to-noise ratio of the image which is formed by compounding the zero-angle subframe image when the emission angle is a zero angle, the first subframe image when the emission angle is the first deflection angle and the second subframe image when the emission angle is the second deflection angle meet the preset threshold condition;
scanning an object to be detected according to the determined angle values of the first deflection angle and the second deflection angle of the at least one deflection angle group, and acquiring a zero-angle subframe image and corresponding first subframe image and second subframe image when the emission angle is a zero angle;
and carrying out spatial compound imaging on the acquired zero-angle subframe image, the acquired first subframe image and the acquired second subframe image to obtain a compound image.
According to the space composite imaging method, the size of the deflection angle required by the space composite image is selected in a self-adaptive mode to be scanned according to the pre-scanning result and the scanning environment parameters, more sub-frame images are made to participate in the space composite imaging, the larger optimal image quality area and the signal to noise ratio are obtained, and therefore the overall image quality of the space composite image is improved.
The spatial composite imaging method is further improved in that the scanning environment parameters comprise scanning depth; determining angle values of a first deflection angle and a second deflection angle of the at least one deflection angle group according to the result of the pre-scanning and the scanning environment parameters, comprising:
providing a plurality of alternative deflection angles as angle values of a first deflection angle and a second deflection angle of the deflection angle group, and performing prescanning on an object to be detected;
counting the optimal image quality area and the signal-to-noise ratio which respectively correspond to the multiple alternative deflection angles during scanning under different scanning depth conditions;
establishing a corresponding relation table of deflection angles corresponding to different scanning depths, an optimal image quality area and a signal-to-noise ratio according to the statistical result;
and selecting a deflection angle corresponding to the current scanning depth and enabling the optimal image quality area and the signal-to-noise ratio to meet the threshold condition from the corresponding relation table according to the current scanning depth, and using the deflection angle as the angle value of the first deflection angle and the second deflection angle of the at least one deflection angle group under the condition of the current scanning depth.
In the spatial composite imaging method, the threshold condition comprises the following steps: the optimal image quality area is at least half of the zero-angle subframe image area, and the signal-to-noise ratio accords with a preset signal-to-noise ratio threshold value.
The spatial compound imaging method is further improved in that the optimal image quality area is as follows: and according to the mutually overlapped part of the zero-angle subframe image when the emission angle is the zero angle, the first subframe image when the emission angle is the first deflection angle and the second subframe image when the emission angle is the second deflection angle in the composite imaging image of the three.
The spatial composite imaging method according to the present application is further improved in that, scanning an object to be detected according to the determined angle values of the first deflection angle and the second deflection angle of the at least one deflection angle group, and acquiring a zero-angle subframe image when the emission angle is a zero angle, and a corresponding first subframe image and a corresponding second subframe image, includes: acquiring a plurality of zero-angle subframe images with a zero emission angle, a first subframe image with a first deflection angle and a second subframe image with a second deflection angle according to a time sequence, and combining the subframe images corresponding to any adjacent (N x 2+1) emission angles into a subframe image group so as to obtain a plurality of different subframe image groups; and N is the number of the deflection angle groups.
The spatial compound imaging method according to the present application is further improved in that the spatial compound imaging is performed on the acquired zero-angle subframe image, the first subframe image, and the second subframe image to obtain a compound image, and the method includes: and respectively carrying out spatial compound imaging on (N x 2+1) subframe images in all the subframe image groups and displaying the subframe images.
The spatial compound imaging method is further improved in that (N × 2+1) subframe images in all the subframe image groups are respectively subjected to spatial compound imaging and displayed, and the method comprises the following steps:
converting the corresponding image space position of the same subframe image group when the emission angle is not zero into the corresponding image space position when the emission angle is zero through scanning conversion or resampling treatment to obtain a converted subframe image;
and averaging and summing the converted sub-frame images and the sub-frame images at the corresponding image space positions when the emission angle is zero to obtain a composite image, and then displaying the composite image.
In the spatial compound imaging method, the scanning environment parameters further include: the type of probe and the intended location of the probe.
The present application further provides a spatial compound imaging system, comprising:
the pre-scanning module is used for pre-scanning an object to be detected from an emission angle contained in a zero-angle emission angle and at least one deflection angle group; the deflection angle group comprises a first deflection angle and a second deflection angle which are opposite in number;
a deflection angle determination module configured to determine angle values of a first deflection angle and a second deflection angle of the at least one deflection angle group according to a pre-scanning result and a scanning environment parameter of the pre-scanning module, so that an optimal image quality region and a signal-to-noise ratio of an image compositely imaged according to a zero-angle subframe image when an emission angle is a zero angle, a first subframe image when the emission angle is the first deflection angle, and a second subframe image when the emission angle is the second deflection angle meet a preset threshold condition;
the sub-frame image acquisition module is configured to scan an object to be detected according to the angle values of the first deflection angle and the second deflection angle of the at least one deflection angle group determined by the deflection angle determination module, and acquire a zero-angle sub-frame image when the emission angle is a zero angle and corresponding first sub-frame image and second sub-frame image;
a composite imaging module configured to perform spatial composite imaging on the zero-angle subframe image, the first subframe image, and the second subframe image acquired by the subframe image acquisition module to obtain a composite image.
According to the space composite imaging system, the subframe image acquisition module selects the deflection angle required by the space composite image determined by the deflection angle determination module to scan according to the pre-scanning result and the scanning environment parameters of the pre-scanning module, so that more subframe images participate in space composite imaging to obtain a larger optimal image quality area and a signal-to-noise ratio, and the overall image quality of the space composite image obtained by the composite imaging module is improved.
In the spatial compound imaging system, the scanning environment parameter comprises a scanning depth; the deflection angle determination module further comprises:
a deflection angle candidate module configured to provide a plurality of candidate deflection angles as angle values of a first deflection angle and a second deflection angle of the deflection angle group for pre-scanning an object to be detected;
the statistic module is configured to count the optimal image quality area and the signal-to-noise ratio respectively corresponding to the multiple candidate deflection angles provided by the deflection angle candidate module during scanning under different scanning depth conditions;
the form establishing module is used for establishing a corresponding relation table of deflection angles corresponding to different scanning depths, an optimal image quality area and a signal-to-noise ratio according to the statistical result of the statistical module;
and the deflection angle selecting module is configured to select a deflection angle corresponding to the current scanning depth and enabling the optimal image quality area and the signal-to-noise ratio to meet the threshold condition from the corresponding relation table according to the current scanning depth, and the deflection angle is used as the angle values of the first deflection angle and the second deflection angle of the at least one deflection angle group under the current scanning depth condition.
In a further improvement of the spatial compound imaging system of the present application, the spatial compound imaging system further includes a threshold setting module, the threshold setting module sets the threshold condition to be that the optimal image quality area is at least half of the zero-angle sub-frame image area, and the signal-to-noise ratio meets a preset signal-to-noise ratio threshold.
In the spatial compound imaging system, the spatial compound imaging system further comprises an optimal image quality region determining module, wherein the optimal image quality region determining module determines the optimal image quality region as: and according to the mutually overlapped part of the zero-angle subframe image when the emission angle is the zero angle, the first subframe image when the emission angle is the first deflection angle and the second subframe image when the emission angle is the second deflection angle in the composite imaging image of the three.
In a further improvement of the spatial compound imaging system, the sub-frame image obtaining module further includes: the sub-frame image group combination module is used for acquiring a plurality of zero-angle sub-frame images with the emission angle of zero, a first sub-frame image with the emission angle of the first deflection angle and a second sub-frame image with the emission angle of the second deflection angle according to a time sequence, and combining the sub-frame images corresponding to any adjacent (N x 2+1) emission angles into one sub-frame image group so as to obtain a plurality of different sub-frame image groups; and N is the number of the deflection angle groups.
In a further improvement of the spatial compound imaging system of the present application, the compound imaging module is further configured to perform spatial compound imaging on (N × 2+1) subframe images in all the subframe image groups respectively and display the result.
In a further development of the spatial compound imaging system of the present application, the compound imaging module is further configured for performing the following steps:
converting the corresponding image space position of the same subframe image group when the emission angle is not zero into the corresponding image space position when the emission angle is zero through scanning conversion or resampling treatment to obtain a converted subframe image;
and averaging and summing the converted sub-frame images and the sub-frame images at the corresponding image space positions when the emission angle is zero to obtain a composite image, and then displaying the composite image.
The application also provides an ultrasonic imaging device comprising the spatial compound imaging system.
The ultrasonic imaging equipment adopts the space composite imaging system, selects the size of the deflection angle required by the determined space composite image to scan according to the pre-scanning result and the scanning environment parameters, and enables more subframe images to participate in the space composite imaging so as to obtain a larger optimal image quality area and a signal-to-noise ratio, thereby improving the overall image quality of the space composite image.
Drawings
Fig. 1 and 2 are schematic diagrams of a three-frame image composite processing in a first scanning depth by a spatial composite imaging method in the prior art.
Fig. 3 and 4 are schematic diagrams of a three-frame image composite processing in a second scanning depth by a spatial composite imaging method in the prior art.
Fig. 5 is a schematic flow chart of a spatial compound imaging method shown in the present application.
Fig. 6 is a flowchart illustrating the process of determining the optimal scan angle according to the scan depth in an embodiment of the present application.
FIG. 7 is a schematic flow chart of composite imaging of different angle scan images according to an embodiment of the present application.
Fig. 8 and 9 are schematic diagrams of three-frame image composite processing at the second scanning depth shown in fig. 3 by using the spatial composite imaging method of the present application.
Fig. 10 is a block diagram illustrating a spatial compound imaging system according to the present application.
Fig. 11 is a block diagram illustrating a deflection angle determining module of a spatial compound imaging system according to the present application.
Fig. 12 is a block diagram of a sub-frame image acquisition module of a spatial compound imaging system according to the present application.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
It is to be understood that although the terms first, second, third, etc. may be used herein to describe various information, such information should not be limited to these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present application. The word "if" as used herein may be interpreted as "at … …" or "when … …" or "in response to a determination", depending on the context.
The spatial compound imaging method, system and ultrasonic imaging apparatus of the present application are described in detail below with reference to the accompanying drawings. The features of the following examples and embodiments may be combined with each other without conflict.
Referring to fig. 5, fig. 5 is a schematic flow chart of a spatial compound imaging method according to the present application. The spatial compound imaging method comprises the following steps:
step S101: pre-scanning an object to be detected from an emission angle contained in a zero-angle emission angle and at least one deflection angle group; the deflection angle group comprises a first deflection angle and a second deflection angle which are opposite in number;
step S102: according to the result of pre-scanning and the scanning environment parameters, determining the angle values of a first deflection angle and a second deflection angle of at least one deflection angle group, so that the optimal image quality area and the signal-to-noise ratio of the image which is formed by compounding the zero-angle subframe image when the emission angle is a zero angle, the first subframe image when the emission angle is the first deflection angle and the second subframe image when the emission angle is the second deflection angle meet the preset threshold condition;
step S103: scanning an object to be detected according to the determined angle values of the first deflection angle and the second deflection angle of the at least one deflection angle group, and acquiring a zero-angle subframe image and corresponding first subframe image and second subframe image when the emission angle is a zero angle;
step S104: and carrying out spatial compound imaging on the acquired zero-angle subframe image, the acquired first subframe image and the acquired second subframe image to obtain a compound image.
According to the space composite imaging method, the size of the deflection angle required by the space composite image is selected in a self-adaptive mode to be scanned according to the pre-scanning result and the scanning environment parameters, more sub-frame images are made to participate in the space composite imaging, the larger optimal image quality area and the signal to noise ratio are obtained, and therefore the overall image quality of the space composite image is improved.
In one embodiment of the present application, the scan environment parameter includes a scan depth. Of course, the scan environment parameters may also include: the type of probe and the intended location of the probe. In the following, the scanning environment parameter including the scanning depth is taken as an example. Referring to fig. 6, fig. 6 is a schematic flowchart illustrating the process of determining the optimal scanning angle according to the scanning depth in an embodiment of the present application. In the step S102, determining the angle values of the first deflection angle and the second deflection angle of the at least one deflection angle group according to the result of the pre-scanning and the scanning environment parameter, further includes:
step S1021: providing a plurality of alternative deflection angles as angle values of a first deflection angle and a second deflection angle of the deflection angle group, and performing prescanning on an object to be detected;
step S1022: counting the optimal image quality area and the signal-to-noise ratio which respectively correspond to the multiple alternative deflection angles during scanning under different scanning depth conditions;
step S1023: establishing a corresponding relation table of deflection angles corresponding to different scanning depths, an optimal image quality area and a signal-to-noise ratio according to the statistical result;
step S1024: and selecting a deflection angle corresponding to the current scanning depth and enabling the optimal image quality area and the signal-to-noise ratio to meet the threshold condition from the corresponding relation table according to the current scanning depth, and using the deflection angle as the angle value of the first deflection angle and the second deflection angle of the at least one deflection angle group under the condition of the current scanning depth.
In one embodiment of the present application, the threshold condition includes: the optimal image quality area is at least half of the zero-angle subframe image area, and the signal-to-noise ratio accords with a preset signal-to-noise ratio threshold value. When the threshold condition is set, the threshold condition is set according to the condition that the optimal image quality area and the signal-to-noise ratio of the space composite image are maximum. In actual operation, the deflection angle is selected to make the best image quality area and the signal-to-noise ratio of the space composite image larger and better for scanning. The optimal image quality area is: and according to the mutually overlapped part of the zero-angle subframe image when the emission angle is the zero angle, the first subframe image when the emission angle is the first deflection angle and the second subframe image when the emission angle is the second deflection angle in the composite imaging image of the three. The signal-to-noise ratio is expressed as the ratio of the variance of the signal to the noise on the image, and the expression is as follows:
SNR(db)＝10lg(powersignal/powernoise)
In an embodiment of the present application, in step S103, scanning the object to be detected according to the determined angle values of the first deflection angle and the second deflection angle of the at least one deflection angle group, and acquiring a zero-angle subframe image when the emission angle is a zero angle and corresponding first subframe image and second subframe image, further includes: acquiring a plurality of zero-angle subframe images with a zero emission angle, a first subframe image with a first deflection angle and a second subframe image with a second deflection angle according to a time sequence, and combining the subframe images corresponding to any adjacent (N x 2+1) emission angles into a subframe image group so as to obtain a plurality of different subframe image groups; and N is the number of the deflection angle groups.
Referring to fig. 7, fig. 7 is a schematic flow chart of composite imaging of different angle scanning images according to an embodiment of the present application. In an embodiment of the application, in step S104, performing spatial compound imaging on the acquired zero-angle subframe image, the first subframe image, and the second subframe image to obtain a compound image, further includes: and respectively carrying out spatial compound imaging on (N x 2+1) subframe images in all the subframe image groups and displaying the subframe images. Further, the (N × 2+1) subframe images in all the subframe image groups are respectively subjected to spatial compound imaging and displayed, and the method comprises the following steps:
step S1041: converting the corresponding image space position of the same subframe image group when the emission angle is not zero into the corresponding image space position when the emission angle is zero through scanning conversion or resampling treatment to obtain a converted subframe image;
step S1042: and averaging and summing the converted sub-frame images and the sub-frame images at the corresponding image space positions when the emission angle is zero to obtain a composite image, and then displaying the composite image.
The above steps are further explained below by taking the number of deflection angle groups as one group (i.e., three frame images) and the deflection angle as 10 °. The deflection angle is 10 deg., then the emission angle is (-10 deg., 0,10 deg.). In step S103, a plurality of sub-frame images can be obtained according to the time sequence, and the sub-frame images correspond to the emission angles (-10 °,0,10 °, -10 °,0,10 °, -10 °,0,10 ° … …) one by one. The sub-frame images corresponding to any adjacent (N × 2+1) transmission angles are combined into a sub-frame image group, that is, the sub-frame images corresponding to any adjacent 3 transmission angles are combined into a sub-frame image group, for example, 3 sub-frame images at the transmission angles (-10 °,0,10 °) can be combined into a sub-frame image group, 3 sub-frame images at the transmission angles (0,10 °) can be combined into a sub-frame image group, and 3 sub-frame images at the transmission angles (10 °, -10 °,0 °) can be combined into a sub-frame image group … ….
In step S104, 3 subframe images in all subframe image groups are respectively subjected to spatial composite imaging to form a plurality of spatial composite images. The method comprises the steps of performing spatial compound imaging on 3 subframe images in a subframe image group combined by emission angles (-10 degrees, 0 degrees and 10 degrees), and performing averaging, adding and normalization processing on the 3 subframe images to obtain a first spatial compound image; carrying out spatial compound imaging on 3 subframe images in the subframe image group combined by the emission angles (0,10 degrees and-10 degrees), and carrying out averaging, adding and normalization processing on the 3 subframe images to obtain a second spatial compound image; the 3 sub-frame images in the sub-frame image group combined by the emission angles (10 °, -10 °,0) are subjected to spatial composite imaging, and the 3 sub-frame images are averaged, summed, and normalized to a third spatial composite image … …. And finally, displaying all the obtained space composite images.
It should be noted that, if the number of the deflection angle sets is multiple, the above steps are also the same, and are not described herein again. The difference lies in the number of sub-frame images in each sub-frame image group. Assuming that the number of deflection angle groups is two groups, the deflection angles are 5 ° and 10 °, and the emission angle is (-10 °, -5 °,0,5 °,10 °), a plurality of subframe images can be acquired according to the timing, the acquired plurality of subframe images correspond one-to-one to the emission angle (-10 °, -5 °,0,5 °,10 °, -10 °, -5 °,0,5 °,10 ° … …), and each subframe image group includes 5 subframe images according to the above rule.
Referring to fig. 8 and 9, fig. 8 and 9 are schematic diagrams of three-frame image composition processing at the second scanning depth shown in fig. 3 by using the spatial composition imaging method of the present application. In the spatial image compounding process, images scanned at three different angles, namely a zero-angle subframe image 91, a first-angle subframe image 92 and a second-angle subframe image 93, are added and normalized to be compounded to obtain a frame of image for display. The display area of the spatial composite image coincides with the zero-angle sub-frame image 91. The partial image quality where all three sub-frame images overlap is the best, called the best image quality area. Wherein the larger the proportion of the optimal image quality area occupying the space-time composite image display area (the area of the zero-angle sub-frame image 91) is, the better the overall quality of the image is. Under the condition that the scanning depth is the same as that of the prior art shown in fig. 3, by adopting the spatial compound imaging method, the deflection angle of the probe 90 during scanning is finally selected to be theta 2 (theta 2< theta 1), the compound image has four areas, and the area a contains three frames of image information and is the area with the best image quality; the B area comprises two frames of image information; the C region has only zero angle subframe images. The area a of the optimum image quality area accounts for a relatively large proportion of the entire display image, about 1/2. Therefore, compared with the prior art, the spatial composite imaging method can obviously improve the size of the optimal image quality area, so that the overall image quality of the spatial composite image is improved. Moreover, the space composite imaging method can really achieve better effect and realize better image quality through simulation verification.
Corresponding to the embodiment of the spatial composite imaging method, the application also provides a spatial composite imaging system. Referring to fig. 10, fig. 10 is a block diagram illustrating a spatial compound imaging system according to the present application. The spatial compound imaging system of the present application comprises:
a pre-scanning module 10 configured to pre-scan an object to be detected from an emission angle included in a zero-angle emission angle and at least one deflection angle group; the deflection angle group comprises a first deflection angle and a second deflection angle which are opposite in number;
a deflection angle determining module 20 configured to determine angle values of a first deflection angle and a second deflection angle of the at least one deflection angle group according to a pre-scanning result and a scanning environment parameter of the pre-scanning module 10, so that an optimal image quality region and a signal-to-noise ratio of an image compositely imaged according to a zero-angle subframe image when an emission angle is a zero angle, a first subframe image when the emission angle is the first deflection angle, and a second subframe image when the emission angle is the second deflection angle meet a preset threshold condition;
a sub-frame image obtaining module 30, configured to scan the object to be detected according to the angle values of the first deflection angle and the second deflection angle of the at least one deflection angle group determined by the deflection angle determining module 20, and obtain a zero-angle sub-frame image when the emission angle is a zero angle and corresponding first sub-frame image and second sub-frame image;
a composite imaging module 40 configured to spatially composite image the zero-angle subframe image, the first subframe image and the second subframe image acquired by the subframe image acquisition module 30 to obtain a composite image.
According to the space composite imaging system, the subframe image acquisition module selects the deflection angle required by the space composite image determined by the deflection angle determination module to scan according to the pre-scanning result and the scanning environment parameters of the pre-scanning module, so that more subframe images participate in space composite imaging to obtain a larger optimal image quality area and a signal-to-noise ratio, and the overall image quality of the space composite image obtained by the composite imaging module is improved.
Referring to fig. 10 again, in an embodiment of the present application, a threshold setting module 50 is further included, and the threshold setting module 50 sets the threshold condition to be that the optimal image quality area is at least half of the zero-angle subframe image area, and the signal-to-noise ratio meets a preset signal-to-noise ratio threshold. When the threshold condition is set, the threshold condition is set according to the condition that the optimal image quality area and the signal-to-noise ratio of the space composite image are maximum. In actual operation, the deflection angle is selected to make the best image quality area and the signal-to-noise ratio of the space composite image larger and better for scanning. In another embodiment of the present application, further comprising an optimal image quality area determining module 60, the optimal image quality area determining module 60 determines the optimal image quality area as: and according to the mutually overlapped part of the zero-angle subframe image when the emission angle is the zero angle, the first subframe image when the emission angle is the first deflection angle and the second subframe image when the emission angle is the second deflection angle in the composite imaging image of the three. The signal-to-noise ratio is expressed as the ratio of the variance of the signal to the noise on the image, and the expression is as follows:
SNR(db)＝10lg(powersignal/powernoise)
Referring to fig. 11, fig. 11 is a block diagram illustrating a structure of a deflection angle determining module of a spatial compound imaging system according to the present application. In one embodiment of the present application, the scan environment parameter includes a scan depth; the deflection angle determination module 20 further includes:
a deflection angle candidate module 210 configured to provide a plurality of candidate deflection angles as angle values of a first deflection angle and a second deflection angle of the deflection angle group for pre-scanning an object to be detected;
a statistic module 220 configured to count respective corresponding optimal image quality regions and signal-to-noise ratios when scanning with the multiple candidate deflection angles provided by the deflection angle candidate module 210 under different scanning depth conditions;
a form establishing module 230 configured to establish a corresponding relationship table of deflection angles corresponding to different scanning depths, an optimal image quality area and a signal-to-noise ratio according to the statistical result of the statistical module 220;
a deflection angle selecting module 240 configured to select, according to the current scanning depth, a deflection angle corresponding to the current scanning depth from the correspondence table, where the deflection angle makes the optimal image quality area and the signal-to-noise ratio meet the threshold condition, as angle values of the first deflection angle and the second deflection angle of the at least one deflection angle group under the current scanning depth condition.
Referring to fig. 12, fig. 12 is a block diagram illustrating a sub-frame image acquisition module of a spatial compound imaging system according to the present application. In an embodiment of the present application, the sub-frame image obtaining module 30 further includes: a sub-frame image group combination module 310, configured to obtain, according to a time sequence, a plurality of zero-angle sub-frame images with a transmission angle of zero, a first sub-frame image with a transmission angle of the first deflection angle, and a second sub-frame image with a transmission angle of the second deflection angle, and combine sub-frame images corresponding to any adjacent (N × 2+1) transmission angles into one sub-frame image group, thereby obtaining a plurality of different sub-frame image groups; and N is the number of the deflection angle groups.
In an embodiment of the present application, the composite imaging module 40 is further configured to spatially composite image and display (N × 2+1) subframe images in all the subframe image groups, respectively. Further, composite imaging module 40 is further configured for performing the steps of:
converting the corresponding image space position of the same subframe image group when the emission angle is not zero into the corresponding image space position when the emission angle is zero through scanning conversion or resampling treatment to obtain a converted subframe image;
and averaging and summing the converted sub-frame images and the sub-frame images at the corresponding image space positions when the emission angle is zero to obtain a composite image, and then displaying the composite image.
The implementation process of the function and the action of each module in the spatial composite imaging system of the present application is specifically detailed in the implementation process of the corresponding step in the spatial composite imaging method of the present application, and is not described herein again.
The application also provides an ultrasonic imaging device comprising the spatial compound imaging system. It should be noted that the description of the spatial compound imaging system in the above-mentioned embodiments is also applicable to the ultrasound imaging apparatus provided in the present application.
In a general ultrasonic imaging device, a composite imaging controller determines the angle size of scanning deflection and the number of subframe image groups according to the requirements of practical application, and realizes the deflection of transmitting and receiving scanning beams by controlling transmitting and receiving time delay focusing parameters. The received signal is dynamically filtered to effectively extract effective frequency components in the echo, the signal-to-noise ratio of the echo signal is improved, and then envelope information of the echo signal is extracted. The envelope extraction can be realized by absolute value detection, and can also be realized by taking the modulus of the orthogonal signal after orthogonal demodulation. And extracting the sub-frame image group with different deflection angles after the envelope signal is subjected to logarithmic compression, downsampling and the like. And carrying out space composite image processing on the newly acquired subframe image group and the subframe image group stored in the memory to generate a space composite image, and sending the space composite image to a display for displaying after digital scanning conversion.
The ultrasonic imaging device of the application adopts the space composite imaging system, selects the size of the deflection angle required by the determined space composite image to scan according to the pre-scanning result and the scanning environment parameters, and enables more subframe images to participate in the space composite imaging so as to obtain a larger optimal image quality area and a signal-to-noise ratio, thereby improving the overall image quality of the space composite image.
In particular, the spatial compounding imaging system described above is preferably implemented by one or more Digital Signal Processors (DSPs), which can process image data in different ways. The digital signal processor weights the received image data and resamples according to spatial pixel alignment. The digital signal processor directly processes the image frame to form frame data and stores the frame data in a frame memory.
The digital signal processor determines the emission angle of the composite sub-frame image according to the change of the system control parameter, such as scanning depth. Selecting a larger deflection angle as an emission angle when the area for obtaining the optimal image quality is taken as a target, namely under the condition of shallow scanning depth; and in the case of deeper scanning depth, selecting a smaller deflection angle as the emission angle. And determining a corresponding relation table of the optimal image quality area and the deflection angle under different scanning depths through simulation and test. When the system runs, the digital signal processor obtains the current optimal deflection angle as the emission angle by looking up the corresponding relation table according to the current scanning depth, and sends the current optimal deflection angle to the control system so as to control the emission angle. Of course, factors influencing the intelligent selection of the deflection angle include the scanning depth, but are not limited to the depth, and may also include, for example: system initialization parameters or other parameters set by the user for use, etc.
At the same time, the digital signal processor selects the sub-frame image stored in the frame memory, and accumulates in the accumulator to form a composite image, or carries out spatial composite imaging through the orthogonal circuit, then compresses to the required display bit number, carries out spatial composite imaging again through looking up the table if necessary, and then transmits the completely composite processed image to the scanning converter for processing and displaying.
For the device embodiments, since they substantially correspond to the method embodiments, reference may be made to the partial description of the method embodiments for relevant points. The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the scheme of the application. One of ordinary skill in the art can understand and implement it without inventive effort.
Although the present application has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the application, and all changes, substitutions and alterations that fall within the spirit and scope of the application are to be understood as being covered by the following claims.
Claims (16)
1. A method of spatially compounded imaging, comprising:
pre-scanning an object to be detected from an emission angle contained in a zero-angle emission angle and at least one deflection angle group; the deflection angle group comprises a first deflection angle and a second deflection angle which are opposite in number;
determining angle values of a first deflection angle and a second deflection angle of the at least one deflection angle group according to a pre-scanning result and a scanning environment parameter, so that an optimal image quality area and a signal-to-noise ratio of an image obtained by compound imaging according to a zero-angle subframe image when a transmission angle is a zero angle, a first subframe image when the transmission angle is the first deflection angle and a second subframe image when the transmission angle is the second deflection angle meet a preset threshold condition, wherein the scanning environment parameter comprises a scanning depth, and when the scanning depth is shallow, the determined angle values of the first deflection angle and the second deflection angle are large; when the scanning depth is deep, the determined angle values of the first deflection angle and the second deflection angle are small;
scanning an object to be detected according to the determined angle values of the first deflection angle and the second deflection angle of the at least one deflection angle group, and acquiring a zero-angle subframe image and corresponding first subframe image and second subframe image when the emission angle is a zero angle;
and carrying out spatial compound imaging on the acquired zero-angle subframe image, the acquired first subframe image and the acquired second subframe image to obtain a compound image.
2. The spatial compound imaging method according to claim 1, wherein determining the angle values of the first deflection angle and the second deflection angle of the at least one deflection angle group according to the result of the pre-scanning and the scanning environment parameters comprises:
providing a plurality of alternative deflection angles as angle values of a first deflection angle and a second deflection angle of the deflection angle group, and performing prescanning on an object to be detected;
counting the optimal image quality area and the signal-to-noise ratio which respectively correspond to the multiple alternative deflection angles during scanning under different scanning depth conditions;
establishing a corresponding relation table of deflection angles corresponding to different scanning depths, an optimal image quality area and a signal-to-noise ratio according to the statistical result;
and selecting a deflection angle corresponding to the current scanning depth and enabling the optimal image quality area and the signal-to-noise ratio to meet the threshold condition from the corresponding relation table according to the current scanning depth, and using the deflection angle as the angle value of the first deflection angle and the second deflection angle of the at least one deflection angle group under the current scanning depth condition.
3. The spatial compound imaging method as set forth in claim 1, wherein the threshold condition includes: the optimal image quality area is at least half of the zero-angle subframe image area, and the signal-to-noise ratio accords with a preset signal-to-noise ratio threshold value.
4. The spatial compound imaging method according to claim 1, wherein the optimal image quality region is: and according to the mutually overlapped part of the zero-angle subframe image when the emission angle is the zero angle, the first subframe image when the emission angle is the first deflection angle and the second subframe image when the emission angle is the second deflection angle in the composite imaging image of the three.
5. The spatial compound imaging method according to claim 1, wherein scanning an object to be detected according to the determined angle values of the first deflection angle and the second deflection angle of the at least one deflection angle group to obtain a zero-angle subframe image and corresponding first subframe image and second subframe image when an emission angle is a zero angle, comprises: acquiring a plurality of zero-angle subframe images with a zero emission angle, a first subframe image with a first deflection angle and a second subframe image with a second deflection angle according to a time sequence, and combining the subframe images corresponding to any adjacent (N x 2+1) emission angles into a subframe image group so as to obtain a plurality of different subframe image groups; and N is the number of the deflection angle groups.
6. The spatial compound imaging method according to claim 5, wherein spatially compound imaging the acquired zero-angle subframe image, the first subframe image and the second subframe image to obtain a compound image comprises: and respectively carrying out spatial compound imaging on (N x 2+1) subframe images in all the subframe image groups and displaying the subframe images.
7. The spatial compound imaging method according to claim 6, wherein the spatially compound imaging and displaying (N × 2+1) subframe images in all the subframe image groups respectively comprises:
converting the corresponding image space position of the same subframe image group when the emission angle is not zero into the corresponding image space position when the emission angle is zero through scanning conversion or resampling treatment to obtain a converted subframe image;
and averaging and summing the converted sub-frame images and the sub-frame images at the corresponding image space positions when the emission angle is zero to obtain a composite image, and then displaying the composite image.
8. The spatial compound imaging method as set forth in claim 1, wherein the scanning environment parameters further include: the type of probe and the intended location of the probe.
9. A spatial compound imaging system, comprising:
the pre-scanning module is used for pre-scanning an object to be detected from an emission angle contained in a zero-angle emission angle and at least one deflection angle group; the deflection angle group comprises a first deflection angle and a second deflection angle which are opposite in number;
a deflection angle determination module configured to determine angle values of a first deflection angle and a second deflection angle of the at least one deflection angle group according to a pre-scanning result of the pre-scanning module and a scanning environment parameter, so that an optimal image quality region and a signal-to-noise ratio of an image compositely imaged according to a zero-angle subframe image when an emission angle is a zero angle, a first subframe image when the emission angle is the first deflection angle, and a second subframe image when the emission angle is the second deflection angle meet a preset threshold condition, the scanning environment parameter includes a scanning depth, and the determined angle values of the first deflection angle and the second deflection angle are large when the scanning depth is shallow; when the scanning depth is deep, the determined angle values of the first deflection angle and the second deflection angle are small;
the sub-frame image acquisition module is configured to scan an object to be detected according to the angle values of the first deflection angle and the second deflection angle of the at least one deflection angle group determined by the deflection angle determination module, and acquire a zero-angle sub-frame image when the emission angle is a zero angle and corresponding first sub-frame image and second sub-frame image;
a composite imaging module configured to perform spatial composite imaging on the zero-angle subframe image, the first subframe image, and the second subframe image acquired by the subframe image acquisition module to obtain a composite image.
10. The spatial composite imaging system of claim 9, wherein the deflection angle determination module further comprises:
a deflection angle candidate module configured to provide a plurality of candidate deflection angles as angle values of a first deflection angle and a second deflection angle of the deflection angle group for pre-scanning an object to be detected;
the statistic module is configured to count the optimal image quality area and the signal-to-noise ratio respectively corresponding to the multiple candidate deflection angles provided by the deflection angle candidate module during scanning under different scanning depth conditions;
the form establishing module is used for establishing a corresponding relation table of deflection angles corresponding to different scanning depths, an optimal image quality area and a signal-to-noise ratio according to the statistical result of the statistical module;
and the deflection angle selecting module is configured to select a deflection angle corresponding to the current scanning depth and enabling the optimal image quality area and the signal-to-noise ratio to meet the threshold condition from the corresponding relation table according to the current scanning depth, and the deflection angle is used as the angle values of the first deflection angle and the second deflection angle of the at least one deflection angle group under the current scanning depth condition.
11. The spatial compounding imaging system of claim 9, further comprising a threshold setting module that sets the threshold condition such that the optimal image quality region is at least half of the zero angle sub-frame image region, and the signal-to-noise ratio meets a preset signal-to-noise ratio threshold.
12. The spatial compound imaging system of claim 9, further comprising a best image quality region determination module that determines the best image quality region as: and according to the mutually overlapped part of the zero-angle subframe image when the emission angle is the zero angle, the first subframe image when the emission angle is the first deflection angle and the second subframe image when the emission angle is the second deflection angle in the composite imaging image of the three.
13. The spatial compound imaging system of claim 9, wherein the sub-frame image acquisition module further comprises: the sub-frame image group combination module is used for acquiring a plurality of zero-angle sub-frame images with the emission angle of zero, a first sub-frame image with the emission angle of the first deflection angle and a second sub-frame image with the emission angle of the second deflection angle according to a time sequence, and combining the sub-frame images corresponding to any adjacent (N x 2+1) emission angles into one sub-frame image group so as to obtain a plurality of different sub-frame image groups; and N is the number of the deflection angle groups.
14. The spatial compound imaging system of claim 13, wherein the compound imaging module is further configured to spatially compound image and display (N x 2+1) sub-frame images of all of the sub-frame image sets, respectively.
15. The spatial compound imaging system of claim 14, wherein the compound imaging module is further configured for performing the steps of:
converting the corresponding image space position of the same subframe image group when the emission angle is not zero into the corresponding image space position when the emission angle is zero through scanning conversion or resampling treatment to obtain a converted subframe image;
and averaging and summing the converted sub-frame images and the sub-frame images at the corresponding image space positions when the emission angle is zero to obtain a composite image, and then displaying the composite image.
16. An ultrasound imaging apparatus, comprising: the spatial composite imaging system of any of claims 9 to 15.
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