CN116725573A - Ultrasonic imaging method, ultrasonic imaging device, electronic equipment and computer storage medium - Google Patents
Ultrasonic imaging method, ultrasonic imaging device, electronic equipment and computer storage medium Download PDFInfo
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- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
- A61B8/08—Detecting organic movements or changes, e.g. tumours, cysts, swellings
- A61B8/0858—Detecting organic movements or changes, e.g. tumours, cysts, swellings involving measuring tissue layers, e.g. skin, interfaces
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- A—HUMAN NECESSITIES
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- A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
- A61B8/44—Constructional features of the ultrasonic, sonic or infrasonic diagnostic device
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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- A61B8/4483—Constructional features of the ultrasonic, sonic or infrasonic diagnostic device characterised by features of the ultrasound transducer
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- A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
- A61B8/52—Devices using data or image processing specially adapted for diagnosis using ultrasonic, sonic or infrasonic waves
- A61B8/5207—Devices using data or image processing specially adapted for diagnosis using ultrasonic, sonic or infrasonic waves involving processing of raw data to produce diagnostic data, e.g. for generating an image
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Abstract
The application relates to an ultrasonic imaging method, an ultrasonic imaging device, electronic equipment and a computer storage medium. The method comprises the following steps: acquiring positions of a plurality of transmitting focuses in a target imaging area; the plurality of transmit focal points are located at a plurality of depths in the target imaging region; controlling each of a plurality of transmit array elements of a transducer to transmit a first beam based on the positions of the plurality of transmit focal points; obtaining multiple echo signals based on the first beams; and processing the multi-echo signals by using a backtracking beam forming algorithm to obtain an ultrasonic image. The multi-echo signal is used for solving the problem that an ultrasonic image obtained by combining a traditional focusing emission method with a backtracking beam forming algorithm can form an image dark area, so that the quality of the ultrasonic image is affected.
Description
Technical Field
The present application relates to the field of image processing technologies, and in particular, to an ultrasound imaging method, an ultrasound imaging apparatus, an electronic device, and a computer storage medium.
Background
The ultrasound imaging device may be in contact with the skin surface of the region of interest by an ultrasound probe that, after contact with the skin surface of the region of interest, obtains an ultrasound image by scanning the region of interest. In order to improve the resolution and the penetrating power of an ultrasonic image, a beam in an interested region is required to have a good focusing effect, and an ultrasonic image obtained by combining a traditional focusing emission method with a retrospective beam forming algorithm can form an image dark area, so that the quality of the ultrasonic image is affected.
Disclosure of Invention
Based on this, it is necessary to provide an ultrasound imaging method, an ultrasound imaging device, an electronic apparatus and a computer storage medium to solve the problem that the quality of an ultrasound image is affected because an image dark area is formed by an ultrasound image obtained by combining a conventional focusing emission method with a retrospective beam forming algorithm.
In a first aspect, the present application provides a method of ultrasound imaging, the method comprising:
acquiring positions of a plurality of transmitting focuses in a target imaging area; the plurality of transmit focal points are located at a plurality of depths in the target imaging region.
And controlling each of a plurality of transmitting array elements of the transducer to transmit a first beam based on the positions of the plurality of transmitting focuses.
And obtaining multiple echo signals based on the first beams.
And processing the multi-echo signals by using a backtracking beam forming algorithm to obtain an ultrasonic image.
In one embodiment, the determining the position of the first emission focus based on the positions of two adjacent target reference focuses in the reference focuses includes:
acquiring the positions of reference focuses in a plurality of emission focuses in the target imaging area; the reference focus is located at a first depth of the plurality of depths, and one transmit aperture corresponds to one reference focus.
Determining the position of a first transmitting focus based on the positions of two adjacent target reference focuses in the reference focuses; the first emission focus is the emission focus closest to the transverse distance between the adjacent two target reference focuses at other depths except the first depth in the plurality of depths.
In one embodiment, the determining the position of the first emission focus based on the position of the reference focus includes:
acquiring a first included angle and a first distance, wherein the first included angle is an included angle between a position connecting line of a first end of the transmitting aperture and the target reference focus corresponding to the transmitting aperture and the transducer; the first distance is a lateral distance between the first emission focus and the target reference focus closest to the first emission focus.
And determining the position of the first emission focus according to the first included angle and the first distance.
In one embodiment, the acquiring the first distance includes:
and acquiring the transverse distance between the reference focuses of the two adjacent targets.
And determining the first distance according to the transverse distance between the adjacent two target reference focuses.
In one embodiment, the determining the position of the first emission focal point according to the first included angle and the first distance includes:
And determining the depth of the first emission focus according to the first included angle and the first distance.
And determining the position of the first emission focus according to the depth of the first emission focus and the first distance.
In one embodiment, the method further comprises: the aperture value f-number of each emission focus is the same.
In one embodiment, processing the multiple ultrasound echo signals using the backtracking beam forming algorithm includes:
and synthesizing the multi-echo signals by using the backtracking beam synthesis algorithm to obtain a plurality of image data sets.
The ultrasound image is determined from the plurality of image datasets.
In one embodiment, the determining the ultrasound image from the plurality of image datasets comprises:
and performing coherent compounding on the plurality of image data sets to obtain the ultrasonic image.
In a second aspect, the present application also provides an ultrasound imaging apparatus, the apparatus comprising:
an acquisition module for acquiring positions of a plurality of emission focuses in a target imaging region; the plurality of transmit focal points are located at a plurality of depths in the target imaging region.
And the control module is used for controlling each transmitting array element in the plurality of transmitting array elements of the transducer to transmit the first wave beam based on the positions of the plurality of transmitting focuses acquired by the acquisition module.
The acquisition module is used for controlling the first wave beams transmitted by the plurality of transmitting array elements of the transducer based on the control module to obtain multi-echo signals.
And the processing module is used for synthesizing the multi-echo signals by using the backtracking beam synthesis algorithm to obtain an ultrasonic image.
In a third aspect, the present application also provides a computer device. The computer device comprises a memory and a processor, wherein the memory stores a computer program, and the processor realizes the following steps when executing the computer program:
acquiring positions of a plurality of transmitting focuses in a target imaging area; the plurality of transmit focal points are located at a plurality of depths in the target imaging region.
And controlling each of a plurality of transmitting array elements of the transducer to transmit a first beam based on the positions of the plurality of transmitting focuses.
And obtaining multiple echo signals based on the first beams.
And processing the multiple ultrasonic echo signals by using a backtracking beam synthesis algorithm to obtain an ultrasonic image.
In a fourth aspect, the present application also provides a computer-readable storage medium. A computer program stored thereon, which when executed by a processor, performs the steps of:
acquiring positions of a plurality of transmitting focuses in a target imaging area; the plurality of transmit focal points are located at a plurality of depths in the target imaging region.
And controlling each of a plurality of transmitting array elements of the transducer to transmit a first beam based on the positions of the plurality of transmitting focuses.
And obtaining multiple echo signals based on the first beams.
And processing the multi-echo signals by using a backtracking beam forming algorithm to obtain an ultrasonic image.
In a fifth aspect, the present application also provides a computer program product. The computer program product comprises a computer program which, when executed by a processor, implements the steps of:
acquiring positions of a plurality of transmitting focuses in a target imaging area; the plurality of transmit focal points are located at a plurality of depths in the target imaging region.
And controlling each of a plurality of transmitting array elements of the transducer to transmit a first beam based on the positions of the plurality of transmitting focuses.
And obtaining multiple echo signals based on the first beams.
And processing the multi-echo signals by using a backtracking beam forming algorithm to obtain an ultrasonic image.
According to the ultrasonic imaging method, the device, the electronic equipment and the computer storage medium, through the acquired positions of the plurality of transmitting focuses positioned in a plurality of depths in the target imaging area, the first wave beams transmitted by the plurality of transmitting array elements of the transducer are controlled based on the positions of the plurality of transmitting focuses to cover all areas in the target imaging area, so that the multi-echo signals obtained according to the plurality of first wave beams are processed by using a backtracking wave beam synthesis algorithm, an ultrasonic image with better definition is obtained, the problem that the coverage of the ultrasonic image obtained by combining the traditional focusing transmitting method with the backtracking wave beam synthesis algorithm on the target imaging area is incomplete, an ultrasonic image dark area is formed is solved, and the quality of the ultrasonic image is improved.
Drawings
FIG. 1 is a schematic diagram showing the effect of the effective imaging range of a focal point in the prior art;
FIG. 2 is a schematic diagram showing the effect of the effective imaging range of multiple focuses in the prior art;
FIG. 3 is an architecture diagram of an ultrasound imaging system in one embodiment;
FIG. 4 is one of the flow diagrams of the ultrasound imaging method in one embodiment;
FIG. 5 is a second flow chart of an ultrasound imaging method in one embodiment;
FIG. 6 is a schematic diagram of one embodiment of the effects of focused cross-emission;
FIG. 7 is a second schematic diagram of the effect of focused cross-emission in one embodiment;
FIG. 8 is a third schematic diagram of the effect of focused cross-emission in one embodiment;
FIG. 9 is a diagram illustrating the effect of focused cross-emission in one embodiment;
FIG. 10 is a schematic diagram of an ultrasound imaging device in one embodiment;
FIG. 11 is an internal block diagram of a computer device in one embodiment.
Detailed Description
The following description of the embodiments of the present application will be made more apparent and fully hereinafter with reference to the accompanying drawings, in which some, but not all embodiments of the application are shown. All other embodiments obtained by a person skilled in the art based on the embodiments provided by the present application fall within the scope of protection of the present application.
Throughout the specification and claims, unless the context requires otherwise, the word "comprise" and its other forms such as the third person referring to the singular form "comprise" and the present word "comprising" are to be construed as open, inclusive meaning, i.e. as "comprising, but not limited to. In the description of the present specification, the terms "one embodiment", "some embodiments", "example embodiment", "example", "specific example", or "some examples" and the like are intended to indicate that a specific feature, structure, material, or characteristic related to the embodiment or example is included in at least one embodiment or example of the present application. The schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
The terms "first" and "second" are used below for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the embodiments of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.
In describing some embodiments, expressions of "coupled" and "connected" and their derivatives may be used. For example, the term "connected" may be used in describing some embodiments to indicate that two or more elements are in direct physical or electrical contact with each other. As another example, the term "coupled" may be used in describing some embodiments to indicate that two or more elements are in direct physical or electrical contact. However, the term "coupled" or "communicatively coupled (communicatively coupled)" may also mean that two or more elements are not in direct contact with each other, but yet still co-operate or interact with each other. The embodiments disclosed herein are not necessarily limited to the disclosure herein.
At least one of "A, B and C" has the same meaning as at least one of "A, B or C," both include the following combinations of A, B and C: a alone, B alone, C alone, a combination of a and B, a combination of a and C, a combination of B and C, and a combination of A, B and C.
As used herein, the term "if" is optionally interpreted to mean "when … …" or "at … …" or "in response to a determination" or "in response to detection" depending on the context. Similarly, the phrase "if determined … …" or "if detected [ stated condition or event ]" is optionally interpreted to mean "upon determining … …" or "in response to determining … …" or "upon detecting [ stated condition or event ]" or "in response to detecting [ stated condition or event ]" depending on the context.
The use of "adapted" or "configured to" herein is meant to be an open and inclusive language that does not exclude devices adapted or configured to perform additional tasks or steps.
In addition, the use of "based on" or "according to" is intended to be open and inclusive in that a process, step, calculation, or other action "based on" or "according to" one or more of the stated conditions or values may in practice be based on additional conditions or beyond the stated values.
Beamforming plays a vital role in medical ultrasound imaging, which means that signals of different channels need to be superimposed, resulting in a signal enhancement effect.
The ultrasound imaging device may contact the skin surface of the region of interest through an ultrasound probe that scans the region of interest through a beam after contacting the skin surface of the region of interest to obtain an ultrasound image. In order to improve the resolution and penetration of an ultrasound image, a beam in a region of interest is required to have a good focusing effect, and referring to fig. 1, an effective imaging range for forming one focal point is schematically shown in fig. 1, and the effective imaging range in the imaging region is a gray region. Based on the above, the focusing mode of the beam by the conventional focusing method adopts a fixed emission focusing mode, so that the focus is formed at a fixed position at the same depth. When there are a plurality of focal points such as focal point b1, focal point b2, focal point b3, focal point b4, and the like as shown in fig. 2, a blank region 201 is generally formed near the focal points, and the blank region 201 characterizes an imaging region in which the effective imaging range is not covered. When the focusing mode is adopted to transmit the wave beam, in an ultrasonic image obtained by processing the received echo signals by using a backtracking wave beam forming algorithm, imaging areas which are not covered near the focuses form an image dark area, so that the quality of the ultrasonic image is affected.
Based on the technical problems, the embodiment of the application provides an ultrasonic imaging method, which is characterized in that the positions of a plurality of transmitting focuses are determined at a plurality of depths in an imaging area to be imaged, so that beams can be focused at focuses at different depths, the whole area of the imaging area can be covered by an effective imaging range when a received echo signal is processed by a retrospective beam synthesis algorithm, the problem that an image dark area is formed by an ultrasonic image obtained by combining the traditional focusing method with the retrospective beam synthesis algorithm is solved, and the quality of the ultrasonic image is improved.
To facilitate the use of the present embodiment, referring to the architecture of the ultrasound imaging system 10 shown in fig. 3, in the ultrasound imaging system 10, an ultrasound imaging device 11 and an ultrasound detection device 12 are included. The ultrasonic detection device 12 can emit an acoustic wave beam to a region of interest (i.e., an imaging region) of a target object, receive the acoustic wave beam returned from the region of interest, and perform electroacoustic signal conversion; specifically, the electroacoustic signal conversion is specifically to convert the electrical signal sent by the ultrasonic imaging device 11 into a sound wave beam with high-frequency oscillation to be emitted to the region of interest of the target object, and convert the sound wave beam reflected by the region of interest of the target object into an electrical signal to be displayed on the display 111 of the ultrasonic imaging device 11. The ultrasound imaging device 11 and the ultrasound detecting device 12 may be disposed in the same apparatus or may be disposed in different apparatuses, which is not limited in any way in the embodiment of the present application.
In an exemplary scenario, in general, the ultrasound imaging apparatus 11 may be a terminal device capable of receiving the electrical signal transmitted by the ultrasound detection apparatus 12; the terminal device may be provided with a multi-general purpose or special purpose computing apparatus environment or configuration. For example: personal computers, server computers, hand-held or portable devices, tablet devices, multiprocessor devices, distributed computing environments that include any of the above devices or devices, and the like. The terminal device may be of different names, such as User Equipment (UE), access device, terminal unit, terminal station, mobile station, remote terminal, mobile device, wireless communication device, terminal agent, or terminal apparatus, etc. In the embodiment of the present application, the device for implementing the function of the ultrasound imaging apparatus 11 may be a terminal device, or may be a device capable of supporting the ultrasound imaging apparatus 11 to implement the function, for example, a chip system or the like. In the present application, the chip system may be formed by a chip, or may include a chip and other discrete devices.
Referring to fig. 4, a detailed description is given of an ultrasound imaging method according to an embodiment of the present application, where the method includes:
S11, acquiring positions of a plurality of transmitting focuses in a target imaging area; the plurality of transmit focal points are located at a plurality of depths in the target imaging region.
It will be appreciated that the location of the different transmit focal points determines the angle and delay of each transmit array element of the transducer corresponding to the beam overlapping at that transmit focal point when transmitting that beam.
It should be noted that each of the plurality of depths in the target imaging region includes one or more transmit focal points.
The target imaging region here may be a region of interest of the target object.
S12, controlling each transmitting array in a plurality of transmitting array elements of the transducer to transmit a first wave beam based on the positions of the transmitting focuses.
The first beam is a beam emitted by the emitting array element.
It should be noted that, the ultrasound detection device 12 includes one or more transducers, each transducer includes a plurality of transmitting array elements, the plurality of transmitting array elements are divided into a plurality of transmitting array element groups according to transmitting apertures, each transmitting array element group includes at least one transmitting array element, and a transmitting angle and a transmitting delay of each transmitting array element in each transmitting aperture are determined according to a position of a transmitting focal point corresponding to each transmitting aperture. Wherein, the transmitting array element can also be called as transmitting array element and transmitting vibration element.
In one example, a single transmit aperture is described below, where i transmit array elements are included, and i is a positive integer; and i transmitting array elements are corresponding to one transmitting focus, and the transmitting focus is corresponding to a transmitting line, wherein the transmitting line is a straight line of the transmitting focus perpendicular to the surface of the transducer. Acquiring the transmission time delay of a transmission channel corresponding to each group of transmission array elements according to the distance and/or angle between the transmission array elements i and the transmission line and the focal depth of the transmission focal point corresponding to the transmission array elements i; in the imaging process, each transmitting array element group is focused on a corresponding focal point through a transmitting channel according to a corresponding transmitting delay wave beam.
It will be appreciated that in other embodiments, the emission focus need not be perpendicular to the surface of the ultrasound transducer, i.e.: the included angle between the transmitting focus and the surface of the ultrasonic transducer is smaller than 90 degrees, and the focus distribution is adjusted by focusing and cross transmitting, so that the effective imaging range covers the whole imaging space.
In one possible implementation, factors affecting the transmission delay also include the type of probe, for example: the linear array probe, the arc array probe and the phased array probe are specifically analyzed as follows.
In one embodiment, if the probe is a linear array probe, the transmission delay corresponding to the transmission array element i is expressed as: delay (i) = (Fm-sqrt (Fm) 2 +dx 2 ))/c。
Wherein Fm is the focal depth of the transmitting focal point corresponding to the transmitting array element i, dx is the transverse distance from the transmitting array element i to the transmitting line, c is the propagation speed of the wave beam, and sqrt represents the evolution operation function.
In another real-time manner, if the probe is an arc probe, the transmission delay corresponding to the transmission array element i can be expressed as: delay (i) = (Fm-sqrt ((fm+roc)) 2 +ROC 2 –2*(Fm+ROC)*ROC*cos(θ)))/c。
Wherein Fm is the focal depth of the transmitting focal point corresponding to the transmitting array element i, ROC is the curvature radius of the transmitting array element i, θ is the deflection angle of the transmitting array element i from the transmitting line, and c is the propagation speed of the wave beam.
In still another real-time manner, if the probe is a phased array probe, the transmission delay corresponding to the transmission array element may be expressed as: delay (i) = (Fm-sqrt (Fm) 2 +dx 2 –2*Fm*dx*cos(π/2-θ)))/c。
Wherein Fm is the focal depth of the transmitting focal point corresponding to the transmitting array element i, dx is the transverse distance between the transmitting array element i and the transmitting line, θ is the deflection angle of the transmitting line, and c is the propagation speed of the wave beam.
In practical application, most of the obtained emission time delay is a negative number, and in this case, if the obtained emission time delay is a negative number, for practical requirements, the emission time delay (i) is converted into a positive number, that is, the conversion is performed by the following formula, where delay (i) =delay (i) +abs (min (delay)).
Wherein, min (delay) represents taking the minimum negative value in the delay array; abs (min (delay)) means the absolute value of min (delay) in brackets.
S13, obtaining multi-echo signals based on the first beams.
In particular, an element for receiving an echo beam may be referred to as a receive element.
In practical application, the transmitting array element used for transmitting the first beam may be used for transmitting the first beam only, and the corresponding receiving array element may be other array elements except the transmitting array element in the transducer; alternatively, all or part of the transmitting array elements transmitting the first beam are used as receiving array elements to receive the echo signals (ultrasonic echo signals), and the corresponding receiving array elements may be all transmitting array elements; or part of the array elements can be transmitting array elements, and the other part of the array elements except the transmitting array elements in the transducer. The embodiment of the present application is not limited in any way.
Here, the first beam emitted by the transmitting array element in one transmitting aperture can obtain echo beams reflected by a plurality of points in the target imaging area.
S14, processing the multi-echo signals by using a backtracking beam forming algorithm to obtain ultrasonic image multi-echo signals.
In one embodiment, S14 specifically includes: and synthesizing the multiple echo signals by using a backtracking beam synthesis algorithm to obtain multiple image data sets, and determining an ultrasonic image according to the multiple image data sets.
In one implementation, the image dataset corresponds one-to-one to the number of transmit apertures; multiple transmit array elements in each transmit aperture can result in one image dataset.
For example, assuming that the target imaging area includes a point a, two receiving array elements (receiving array element 1 and receiving array element 2) are used for receiving echo beams reflected by the first beam m1 reaching the point a, a mode of determining that a transmitting array element in one transmitting aperture obtains image data of the point a after transmitting the first beam specifically includes: the time delay of the first beam m1 reaching the point a is set as T1, the time delay of the receiving array element 1 for receiving the echo beam 1 reflected by the point a is set as R1, and the time delay of the receiving array element 2 for receiving the echo beam 2 reflected by the point a is set as R2. Thus, echo beam 1 can be determined based on delays T1 and R1; determining echo beam 2 based on delays T1 and R2; and superposing the determined sound wave signal corresponding to the echo wave beam 1 and the sound wave signal corresponding to the echo wave beam 2 to obtain the sound wave signal of the point a, and obtaining the image data of the point a based on the sound wave signal of the point a.
Specifically, determining an ultrasound image from the plurality of image datasets includes: and performing coherent compounding on the plurality of image data sets to obtain an ultrasonic image.
Further, performing coherent compounding on the multiple image data sets specifically refers to overlapping the same pixel point amplitude values in the multiple image data sets to obtain an ultrasound image.
In this embodiment, an ultrasound image is obtained by coherently compositing a plurality of image datasets. Noise can be effectively smoothed, and the signal-to-noise ratio of the image can be improved, so that a high-quality ultrasonic image can be obtained.
In a preferred embodiment, the aperture values f-number of the individual emission focuses are identical.
It will be appreciated that the appropriate transmit element to transmit the first beam is determined based on the depth of focus and the focus strength, such as the location of the transmit element, the number of transmit elements. When the transmitting focal point position is determined, the quantity of transmitting array elements of each array element group influences the focusing intensity, and the focusing intensity can be judged according to f-number indexes, wherein f-number directly influences the form of a sound field and the width of a sound field boundary. The relation between the number of array elements and the f-number of each array element group is as follows: f-number = depth of focus/transmit aperture; the focal depth refers to the depth at which the transmit focal point is located in the target imaging region.
The f-number is a characteristic value representing focusing strength, the focal depth can be expressed as the distance between a transmitting focal point and a transducer, the transmitting aperture refers to the maximum width range formed by all the array elements which are focused to the transmitting focal point and participate in transmitting, the transmitting array element width is called as the transmitting aperture, and the transmitting array element width is in direct proportion to the array element number.
In practical application, the larger the f-number, the weaker the focusing, and the wider and dispersed the sound field of the converging portion is relatively. The smaller the f-number, the stronger the focusing and the narrower the relatively focused sound field of the converging portion.
Based on the above, after the focal position is determined, the number of array elements of each array element group can be determined according to the required f-number.
Of course, the aperture f-number of each emission focus may also be different, which is not limited by the embodiment of the present application.
According to the ultrasonic imaging method, the first beams emitted by the plurality of emitting array elements of the transducer are controlled to cover all areas in the target imaging area based on the positions of the plurality of emitting focuses through the acquired positions of the plurality of emitting focuses positioned in the plurality of depths in the target imaging area, so that the plurality of echo signals are processed by using a backtracking beam forming algorithm according to the plurality of echo signals obtained by the plurality of first beams, an ultrasonic image with better definition is obtained, and therefore the problem that the coverage of the ultrasonic image to the target imaging area, which is obtained by combining the focusing mode of the beams in the traditional focusing method with the backtracking beam forming, is incomplete is solved, the problem of forming an ultrasonic image dark area is solved, and the quality of the ultrasonic image is improved.
In one embodiment, referring to fig. 5, acquiring the positions of a plurality of transmit focal points in a target imaging region includes:
s111, acquiring positions of reference focuses in a plurality of emission focuses in a target imaging area; the reference focus is located at a first depth of the plurality of depths, and one of the transmit apertures corresponds to one of the reference focus.
Specifically, the position of the reference focus includes a longitudinal position and a lateral position; the longitudinal position is a preset depth in the target imaging area, and the preset depth of the reference focus can be determined according to the imaging depth of the target imaging area; for example, the preset depth of the reference focus may be between 20% -80% of the imaging depth. The lateral position may be on an emission line perpendicular to the emission aperture center point. It will be appreciated that a point on the emission line at a predetermined depth may be understood as the reference focus.
S112, determining the position of a first transmitting focus based on the positions of two adjacent target reference focuses in the reference focuses; the first emission focus is the emission focus closest to the lateral distance of the adjacent two target reference focuses at other depths except the first depth in the plurality of depths.
Optionally, at least one first emission focus exists in an imaging area surrounded by depth lines where two target reference focuses are respectively located, so that the emitted first beam can comprehensively cover an image dark area in the target imaging area. Where the depth line refers to a line perpendicular to the transducer in the imaging region.
For example, where the plurality of depths further includes a second depth, the second depth may be greater than the first depth or less than the first depth; the first emission focus in the second depth may be located on a depth line passing through a line connecting adjacent two target focuses.
In a preferred embodiment, the first emission focus in the second depth may be located on a depth line passing through the center of the line connecting the two target focuses.
Alternatively, in the case where the plurality of depths includes only the first depth and the second depth, in order to further improve the definition of imaging, the second depth may be selected to be larger than the first depth, and the first emission focus in the second depth may be located on a depth line passing through the center of the line connecting the two target focuses.
Further, in the case where the plurality of depths further includes a third depth, the depth may be configured in such a manner that the second depth is greater than the first depth and the third depth is less than the first depth. Similarly, the first emission focus in the second depth may be located on a depth line passing through a line connecting adjacent two of the target focuses, and the first emission focus in the third depth may be located on a depth line passing through any point on a line connecting adjacent two of the target focuses.
In one implementation, determining the position of the first transmit focal point based on the positions of two adjacent target reference focal points in the reference focal points includes: acquiring a first included angle and a first distance, wherein the first included angle is an included angle between a position connecting line of a first end of a transmitting aperture and a target reference focus corresponding to the transmitting aperture and a transducer; the first distance is a lateral distance between the first emission focus and a target reference focus closest to the first emission focus. And determining the position of the first emission focus according to the first included angle and the first distance. Therefore, in the embodiment of the application, the position of the first transmitting focal point can be obtained by combining the included angle between the position connecting line of the first end of the transmitting aperture and the target reference focal point corresponding to the transmitting aperture and the transducer and the transverse distance between the target reference focal point and the first transmitting focal point, so that the beam emitted by the transmitting array element corresponding to the first transmitting focal point can cover the imaging area which cannot be covered by the beam emitted by the transmitting array element corresponding to the reference focal point.
For example, referring to fig. 2, when the aperture values f-number for the emission focuses are the same, it is assumed that the reference focus includes a focus b1, a focus b2, a focus b3, and a focus b4; when only the reference focus exists, array elements in each transmitting aperture transmit a first beam, and after focusing at the corresponding reference focus, blank areas 201 which cannot be covered by the first beam exist among the focus b1 and the focus b2, the focus b2 and the focus b3, and the focus b3 and the focus b4, so that the first beam can be covered in the blank areas; thus, a plurality of first emission foci may be determined at a second depth; based on the case where the reference focal points shown in fig. 2 are 4, the number of first emission focal points is at least 3. Wherein at least one first emission focus exists in an imaging region between a depth line in which the focus b1 is located and a depth line in which the focus b2 is located; similarly, at least one first emission focus exists in an imaging region between a depth line in which the focus b2 is located and a depth line in which the focus b3 is located; at least one first emission focus exists in an imaging region located between a depth line in which the focus b3 is located and a depth line in which the focus b4 is located.
In general, the included angle between the two ends of the transmitting aperture and the position connecting line of the target reference focus corresponding to the transmitting aperture and the transducer is the same, so that any end of the transmitting aperture can be used as the first included angle between the first end of the transmitting aperture and the position connecting line of the target reference focus corresponding to the first end of the transmitting aperture, and the formed included angle between the position connecting line and the transducer can be used as the first included angle.
In one embodiment, determining the position of the first emission focal point according to the first included angle and the first distance includes: and determining the depth of the first emission focus according to the first included angle and the first distance. And determining the position of the first emission focus according to the depth of the first emission focus and the first distance.
As an example, in connection with fig. 2, in the case where the plurality of depths is two depths, the plurality of depths further includes a second depth, and assuming that the second depth is greater than the first depth, when an included angle (i.e., a first included angle) between a line connecting both ends of the transmitting aperture and its corresponding reference focus and the transducer is the same, the included angle is set to α, the first distance is set to m, the first depth is set to D, and the second depth is set to d+d. Then d in the second depth satisfies the formula in order to ensure that the effective imaging range can cover the entire target imaging area: d is greater than or equal to m tan (alpha). Assuming that the number of first emission focuses is 3, at the second depth, there is one first emission focus a1 in an imaging region between a depth line in which the focus b1 is located and a depth line in which the focus b2 is located, there is one first emission focus a2 in an imaging region between a depth line in which the focus b2 is located and a depth line in which the focus b3 is located, and there is one first emission focus a3 in an imaging region between a depth line in which the focus b3 is located and a depth line in which the focus b4 is located. Then, the imaging region formed based on the focal points of b1, b2, b3, a1, a2, and a3 can be shown with reference to fig. 6. As can be seen from fig. 6, by adding 3 focuses of a1, a2 and a3 at the second depth, the transmitting array element can transmit the first beam to cover the original blank area 201.
As another example, in connection with fig. 2, where the plurality of depths is two depths, then the plurality of depths further includes a second depth, which is assumed to be less than the first depth, where the included angle is set to α, α >0, where the line connecting the two ends of the transmit aperture to the reference focus and the transducer is the same, where the first distance is set to m, where the first depth is set to D, and where the second depth is set to D-D. Then d in the second depth satisfies the formula in order to ensure that the effective imaging range can cover the entire target imaging area: d is less than or equal to m, and is tan (alpha). Next, with reference to fig. 2, it is assumed that the number of first emission focuses is 3, at the second depth, there is one first emission focus a1 in an imaging area between a depth line in which the focus b1 is located and a depth line in which the focus b2 is located, there is one first emission focus a2 in an imaging area between a depth line in which the focus b2 is located and a depth line in which the focus b3 is located, and there is one first emission focus a3 in an imaging area between a depth line in which the focus b3 is located and a depth line in which the focus b4 is located. Then, the imaging region formed based on the focal points of b1, b2, b3, a1, a2, and a3 can be shown with reference to fig. 7. As can be seen from fig. 7, by adding 3 focuses of a1, a2 and a3 at the second depth, the transmitting array element can transmit the first beam to cover the original blank area 201.
As yet another example, in connection with fig. 2, where the plurality of depths is three depths, then the plurality of depths further includes a second depth and a third depth, the third depth is smaller than the first depth assuming that the second depth is greater than the first depth, the included angle is set to α, the first distance is set to m, the first depth is set to D, and the second depth is set to d+d when the included angle between the line of both ends of the emission aperture and the reference focus and the transducer is the same 1 The third depth is set to D-D 2 . In order to ensure that the effective range can cover the entire target imaging area, d is located in a second depth 1 Satisfy formula d 1 Gtoreq.m.tan (. Alpha.), d in the third depth 2 The formula is satisfied: d, d 2 And < m.times.tan (alpha). Assuming that the number of first emission focuses is 3, at the second depth, there is one first emission focus a1 in an imaging area between a depth line in which the focus b1 is located and a depth line in which the focus b2 is located, and one second emission focus a1 in an imaging area between a depth line in which the focus b3 is located and a depth line in which the focus b4 is locatedAnd a radiation focus a3. At the third depth, there is one first emission focus a2 in the imaging area between the depth line where the focus b2 is located and the depth line where the focus b3 is located, and then the imaging area formed based on the focuses b1, b2, b3, a1, a2, and a3 can be illustrated with reference to fig. 8. As can be seen from fig. 8, by adding 3 foci at the second depth, a1 and a3, and adding a2 at the third depth, the transmitting array element transmits the first beam to cover the original blank area 201.
Based on the above example, referring to fig. 9, the embodiment of the present application is not limited to the above 3 focuses, and assume that the number of first emission focuses is 4, at the second depth, there is one first emission focus a1 in an imaging area between a depth line where the focus b1 is located and a depth line where the focus b2 is located, and one first emission focus a3 in an imaging area between a depth line where the focus b3 is located and a depth line where the focus b4 is located. At the third depth, there is a first emission focus a2 on the depth line where the focus b1 is located, and a first emission focus a4 on the depth line where the focus b3 is located, then the imaging area formed based on the focuses b1, b2, b3, a1, a2, a3, and a4 can be shown with reference to fig. 9. As can be seen from fig. 9, by adding 3 focuses of a1 and a3 at the second depth and a2 and a4 at the third depth, the transmitting array element can still cover the original blank area 201 by transmitting the first beam.
In the implementation mode, the positions of reference focuses in a plurality of emission focuses in a target imaging area are acquired; the reference focus is positioned at a first depth in the plurality of depths, and one emission aperture corresponds to one reference focus, so that the positions of the emission focuses closest to the lateral distances of two adjacent target reference focuses at other depths except the first depth in the plurality of depths are determined based on the positions of the two adjacent target reference focuses in the reference focus. Therefore, the effective imaging range of ultrasound can be ensured to cover the imaging area of the target in a whole range, and the problem of dark areas of images is avoided.
In one implementation, the means for obtaining the first distance includes: acquiring the transverse distance between two adjacent target reference focuses; and determining a first distance according to the transverse distance between the reference focuses of two adjacent targets.
In a preferred embodiment, the first distance may be one half of the lateral distance between adjacent target reference foci. That is, the lateral position of the first emission focus is located at one half of the line connecting the adjacent two target reference focuses.
It should be understood that, although the steps in the flowcharts of fig. 4 and 5 are shown in order as indicated by the arrows, these steps are not necessarily performed in order as indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least some of the steps in fig. 4, 5 may comprise a plurality of sub-steps or phases, which are not necessarily performed at the same time, but may be performed at different times, nor does the order of execution of the sub-steps or phases necessarily follow one another, but may be performed alternately or alternately with at least a portion of the sub-steps or phases of other steps or other steps.
Fig. 10 is a block diagram of the structure of an ultrasonic imaging apparatus 11 of an embodiment. The ultrasonic imaging device 11 includes:
an acquisition module 111 for acquiring positions of a plurality of emission focuses in a target imaging region; the plurality of transmit focal points are located at a plurality of depths in the target imaging region.
A control module 112, configured to control each of a plurality of transmitting array elements of the transducer to transmit the first beam based on the positions of the plurality of transmitting focuses acquired by the acquisition module 111.
The acquisition module 111 is configured to obtain multiple echo signals based on the first beams transmitted by the multiple transmitting array elements of the control module 112.
The processing module 113 is configured to process the multiple echo signals obtained by the obtaining module 111 by using a backtracking beam synthesis algorithm, so as to obtain an ultrasound image.
In one embodiment, the acquiring module 111 is specifically configured to acquire positions of reference focal points in a plurality of emission focal points in the target imaging area; the reference focus is located at a first depth of the plurality of depths, and one emission aperture corresponds to one reference focus; determining the position of a first transmitting focus based on the positions of two adjacent target reference focuses in the reference focuses; the first emission focus is the emission focus closest to the lateral distance of the adjacent two target reference focuses at other depths except the first depth in the plurality of depths.
In one embodiment, the obtaining module 111 is specifically configured to obtain a first included angle and a first distance, where the first included angle is an included angle between a position connection line between a first end of the transmitting aperture and a target reference focus corresponding to the transmitting aperture and the transducer; the first distance is the transverse distance between the first emission focus and the target reference focus with the closest distance between the first emission focus and the target reference focus; and determining the position of the first emission focus according to the first included angle and the first distance.
In one embodiment, the acquiring module 111 is specifically configured to acquire a lateral distance between two adjacent target reference focuses; and determining a first distance according to the transverse distance between the reference focuses of two adjacent targets.
In one embodiment, the obtaining module 111 is specifically configured to determine a depth of the first emission focal point according to the first included angle and the first distance; and determining the position of the first emission focus according to the depth of the first emission focus and the first distance.
In one embodiment, the aperture f-number of each transmit focal point is the same.
In one embodiment, the processing module 113 is specifically configured to synthesize the multiple echo signals by using a traceback beam synthesis algorithm to obtain multiple image datasets; and determining an ultrasound image from the plurality of image datasets.
In one embodiment, the processing module 113 is specifically configured to coherently combine the plurality of image datasets to obtain an ultrasound image.
For specific limitations of the ultrasound imaging apparatus, reference may be made to the limitations of the ultrasound imaging method hereinabove, and will not be described in detail herein. The various modules in the ultrasound imaging apparatus described above may be implemented in whole or in part by software, hardware, and combinations thereof. The above modules may be embedded in hardware or may be independent of a processor in the computer device, or may be stored in software in a memory in the computer device, so that the processor may call and execute operations corresponding to the above modules.
In one embodiment, a computer device is provided, which may be a server, and the internal structure of which may be as shown in fig. 11. The computer device includes a processor, a memory, and a network interface connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, computer programs, and a database. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The database of the computer device is used for storing initial data, and the network interface of the computer device is used for communicating with an external terminal through network connection. The computer program is executed by a processor to implement an ultrasound imaging method. The display screen of the computer equipment can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer equipment can be a touch layer covered on the display screen, can also be keys, a track ball or a touch pad arranged on the shell of the computer equipment, and can also be an external keyboard, a touch pad or a mouse and the like.
It will be appreciated by those skilled in the art that the architecture shown in fig. 11 is merely a block diagram of some of the structures associated with the present inventive arrangements and is not limiting of the computer device to which the present inventive arrangements may be implemented, as a particular computer device may include more or fewer components than those shown, or may combine some of the components, or have a different arrangement of components.
In one embodiment, a computer device is provided, comprising a memory storing a computer program and a processor that when executing the computer program performs the steps of:
acquiring positions of a plurality of transmitting focuses in a target imaging area; the plurality of transmit focal points are located at a plurality of depths in the target imaging region.
And controlling a plurality of transmitting array elements of the transducer to transmit a first wave beam based on the positions of the plurality of transmitting focuses.
And obtaining multiple echo signals based on the first beams.
And synthesizing the multi-echo signals by using the backtracking beam synthesis algorithm.
In one embodiment, a computer readable storage medium is provided having a computer program stored thereon, which when executed by a processor, performs the steps of:
Acquiring positions of a plurality of transmitting focuses in a target imaging area; the plurality of transmit focal points are located at a plurality of depths in the target imaging region.
And controlling a plurality of transmitting array elements of the transducer to transmit a first wave beam based on the positions of the plurality of transmitting focuses.
And obtaining multiple echo signals based on the first beams.
And synthesizing the multi-echo signals by using the backtracking beam synthesis algorithm.
In one embodiment, a computer program product is provided comprising a computer program which, when executed by a processor, performs the steps of:
acquiring positions of a plurality of transmitting focuses in a target imaging area; the plurality of transmit focal points are located at a plurality of depths in the target imaging region.
And controlling a plurality of transmitting array elements of the transducer to transmit a first wave beam based on the positions of the plurality of transmitting focuses.
And obtaining multiple echo signals based on the first beams.
And synthesizing the multi-echo signals by using the backtracking beam synthesis algorithm.
Those skilled in the art will appreciate that implementing all or part of the above described methods may be accomplished by way of a computer program stored on a non-transitory computer readable storage medium, which when executed, may comprise the steps of the embodiments of the methods described above. Any reference to memory, database, or other medium used in embodiments provided herein may include at least one of non-volatile and volatile memory. The nonvolatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical Memory, high density embedded nonvolatile Memory, resistive random access Memory (ReRAM), magnetic random access Memory (Magnetoresistive Random Access Memory, MRAM), ferroelectric Memory (Ferroelectric Random Access Memory, FRAM), phase change Memory (Phase Change Memory, PCM), graphene Memory, and the like. Volatile memory can include random access memory (Random Access Memory, RAM) or external cache memory, and the like. By way of illustration, and not limitation, RAM can be in the form of a variety of forms, such as static random access memory (Static Random Access Memory, SRAM) or dynamic random access memory (Dynamic Random Access Memory, DRAM), and the like. The databases referred to in the embodiments provided herein may include at least one of a relational database and a non-relational database. The non-relational database may include, but is not limited to, a blockchain-based distributed database, and the like. The processor referred to in the embodiments provided in the present application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic unit, a data processing logic unit based on quantum computing, or the like, but is not limited thereto.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The foregoing examples illustrate only a few embodiments of the application and are described in detail herein without thereby limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of the application should be assessed as that of the appended claims.
Claims (10)
1. An ultrasound imaging method, comprising:
acquiring positions of a plurality of transmitting focuses in a target imaging area; the plurality of transmit focal points are located at a plurality of depths in the target imaging region;
controlling each of a plurality of transmit array elements of a transducer to transmit a first beam based on the positions of the plurality of transmit focal points;
obtaining multiple echo signals based on the first beams;
And processing the multi-echo signals by using a backtracking beam forming algorithm to obtain an ultrasonic image.
2. The method of claim 1, wherein the acquiring the locations of the plurality of transmit focal points in the target imaging region comprises:
acquiring the positions of reference focuses in a plurality of emission focuses in the target imaging area; the reference focus is positioned at a first depth in the plurality of depths, and one emission aperture corresponds to one reference focus;
determining the position of a first transmitting focus based on the positions of two adjacent target reference focuses in the reference focuses; the first emission focus is the emission focus closest to the transverse distance between the adjacent two target reference focuses at other depths except the first depth in the plurality of depths.
3. The method of claim 2, wherein determining the location of the first transmit focal point based on the locations of two adjacent target reference focal points in the reference focal points comprises:
acquiring a first included angle and a first distance, wherein the first included angle is an included angle between a position connecting line of a first end of the transmitting aperture and the target reference focus corresponding to the transmitting aperture and the transducer; the first distance is a transverse distance between the first emission focus and the target reference focus closest to the first emission focus;
And determining the position of the first emission focus according to the first included angle and the first distance.
4. A method according to claim 3, wherein said obtaining said first distance comprises:
acquiring the transverse distance between the adjacent two target reference focuses;
and determining the first distance according to the transverse distance between the adjacent two target reference focuses.
5. The method of claim 3 or 4, wherein determining the location of the first emission focus based on the first included angle and the first distance comprises:
determining the depth of the first emission focus according to the first included angle and the first distance;
and determining the position of the first emission focus according to the depth of the first emission focus and the first distance.
6. The method according to any one of claims 1-4, wherein processing the multiple echo signals using a backtracking beam forming algorithm to obtain an ultrasound image comprises:
synthesizing the multi-echo signals by using the backtracking beam synthesis algorithm to obtain a plurality of image data sets;
the ultrasound image is determined from the plurality of image datasets.
7. The method of claim 6, wherein said determining said ultrasound image from said plurality of image datasets comprises:
and performing coherent compounding on the plurality of image data sets to obtain the ultrasonic image.
8. An ultrasound imaging apparatus, comprising:
an acquisition module for acquiring positions of a plurality of emission focuses in a target imaging region; the plurality of transmit focal points are located at a plurality of depths in the target imaging region;
the processing module is used for controlling each transmitting array element in the plurality of transmitting array elements of the transducer to transmit a first wave beam based on the positions of the plurality of transmitting focuses acquired by the acquisition module;
the acquisition module is used for controlling the first wave beams transmitted by the plurality of transmitting array elements of the transducer based on the processing module to obtain multi-echo signals;
and the processing module is used for processing the multi-echo signals by using a backtracking beam forming algorithm to obtain an ultrasonic image.
9. An electronic device comprising a memory and a processor, the memory having stored therein a computer program which, when executed by the processor, causes the processor to perform the steps of the method of any of claims 1 to 7.
10. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the method according to any one of claims 1 to 7.
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