A phantom and method for coronal plane reflection detection in 3D imaging devices

Abstract

This application relates to the field of medical device testing technology, specifically a phantom and method for coronal plane reflection detection in a three-dimensional imaging device. The phantom includes: a top panel and a sealed space inside the acoustic window filled with a background tissue-like material; target lines embedded in the background tissue-like material; an acoustic window, a window for ultrasonic wave transmission, simulating the acoustic characteristics of human epidermal tissue; the background tissue-like material is a water-based polymer gel-based composite material; target lines, with their upper ends fixed in openings in the top panel and their lower ends free; used for quantitative measurement of imaging parameters in the coronal plane, where the coronal plane is a plane parallel to the horizontal plane when the human body is prone on the three-dimensional ultrasound imaging device; the imaging parameters include the lateral linearity, longitudinal linearity, axial image resolution, and lateral image resolution of the reflected image in the coronal plane; the center-to-center distance between two adjacent target lines is a predetermined distance; the predetermined distance is determined by the resolution of the three-dimensional ultrasound imaging device at the corresponding position in the coronal plane.

Description

Technical Field

[0001] This application relates to the field of medical device quality testing technology, and in particular to a phantom and method for detecting coronal plane reflection in three-dimensional imaging equipment. Background Technology

[0002] Ultrasound computed tomography (USCT) is a promising technique for the early detection and diagnosis of breast tumors.

[0003] Ultrasound scanning computed tomography (USCT) can be achieved in various ways, such as forming a series of tomographic images through longitudinal mechanical scanning with a circular array, or forming tomographic images after spatial sampling through mechanical scanning of multiple pairs of transducers. Ultrasound tomography equipment typically uses degassed water as the coupling medium between the transducer and the human body, and is mainly used for three-dimensional ultrasound scanning imaging of the breast, but can also be used for tomographic imaging of the limbs and brain.

[0004] According to the quality system requirements of medical device manufacturers and professional quality inspection institutions, and relevant regulations, all measuring instruments used for quality inspection must be periodically verified or calibrated. How to inspect the coronal plane reflection imaging quality of ultrasound imaging equipment is a problem that urgently needs to be solved. Summary of the Invention

[0005] In a first aspect, embodiments of this application provide a phantom for coronal plane reflection detection of a three-dimensional imaging device, used to detect the imaging resolution of a three-dimensional ultrasound imaging device on the coronal plane at a set depth. The phantom includes: an outer shell, which is a cylindrical structure, surrounded by a top panel 202 and an acoustic window 203; a background tissue-like material 204 filling the sealed space inside the top panel 202 and the acoustic window 203; a target 209 embedded in the background tissue-like material 204; and a protective ring 208 provided at the bonding point between the top panel 202 and the acoustic window 203; the top panel 202... A fixing post 206 is fixed below the top panel 202. The disc head of the fixing post 206 is embedded in the background tissue-simulating material 204. The fixing post 206 is used to achieve an integrated connection between the top panel 202 and the background tissue-simulating material 204. The acoustic window 203 is an acoustically transparent structure, and its material and thickness simulate the acoustic characteristics of human epidermal tissue. The acoustic window 203 is used for the transmission and entry of ultrasonic waves. The background tissue-simulating material 204 is used to simulate the acoustic characteristics of human soft tissue and has standard sound velocity parameters and sound attenuation coefficients. The target line 209 is a linear object. The upper end is fixed in the opening of the top plate (202), and the lower end is free; it is used to quantitatively measure the imaging parameters of the coronal plane, wherein the coronal plane is the plane parallel to the horizontal plane when the human body lies prone on the three-dimensional ultrasound imaging device, and the imaging parameters include the lateral linearity, longitudinal linearity, axial resolution, and lateral resolution of the reflected image on the coronal plane; the lateral linearity is the linearity of the ultrasound reflected image in the coronal axis direction on the coronal plane; the longitudinal linearity is the linearity of the image in the vertical axis direction on the coronal plane; the axial resolution is... The image resolution on the coronal plane is the resolution along the direction from the center point to the tangent point of the arc; the center point is the intersection of the coronal axis and the vertical axis on the coronal plane; the lateral resolution is the resolution of the image on the coronal plane along the direction of the circumferential arc at a specified distance from the center point; the image resolution is determined by the minimum distance between the centers of two clearly separable adjacent target lines on the coronal plane in the image; the distance between the centers of the two adjacent target lines is a set distance; the set distance is used to calibrate the image resolution of the three-dimensional ultrasound imaging device at the corresponding position on the coronal plane.

[0006] The phantom provided in this application has a transmissive external structure design, and the phantom has a target line with a calibrated distance as the target and quantitative indicator for ultrasound three-dimensional imaging. It can measure and evaluate the coronal plane reflection imaging resolution of hemispherical three-dimensional ultrasound equipment or similar equipment with a rotating structure.

[0007] In some possible implementations, the target lines 209 are distributed as multiple target groups according to different uses, including lateral linear target groups, longitudinal linear target groups, and axial lateral target groups; wherein, the lateral linear target groups are used to determine the lateral linearity of the three-dimensional ultrasound imaging device in the coronal plane at different detection depths; the longitudinal linear target groups are used to determine the longitudinal linearity of the three-dimensional ultrasound imaging device in the coronal plane at different detection depths; the axial lateral target groups are used to determine the axial resolution and lateral resolution of the three-dimensional ultrasound imaging device in the coronal plane at different detection depths from the acoustic window 203; the axial lateral target groups include an axial lateral first target group, an axial lateral second target group, and an axial lateral third target group; each target group includes multiple target lines.

[0008] In some possible implementations, the transverse linear target group is arranged laterally from the left to the right side of the phantom, passing through the center point, with the center-to-center distance between adjacent target lines being a predetermined first distance; the longitudinal linear target group is arranged longitudinally from the top to the bottom of the phantom, passing through the center point, with the center-to-center distance between adjacent target lines being a predetermined first distance; the axial-lateral target groups are distributed on the coronal plane both axially and laterally above the center point, with the distance between adjacent target lines on the axial plane being a predetermined axial distance, and the distance between adjacent target lines on the lateral plane being a predetermined lateral distance; the axial direction is the direction on the coronal plane pointing from the center point to the tangent point of the arc, and the lateral direction is the direction indicated by a circumferential arc on the coronal plane at a specified distance from the center point.

[0009] In some possible implementations, the upper panel 202 has several target line openings made by precision machining. The openings are used to position the measuring target line 209. The target line 209 extends vertically from the upper panel 202 to the lower plane of the acoustic window 203.

[0010] In a second aspect, embodiments of this application provide a method for detecting coronal plane reflective imaging performance. The method includes: placing a phantom for detecting coronal plane reflective imaging performance as described in any of the first aspects in water, suspending the phantom in the imaging area of ​​an ultrasound probe; the ultrasound probe is a hemispherical ultrasound probe array, disposed inside the imaging device; setting the ultrasound probe to a transmit-receive state; the radiation surface of the ultrasound probe is distributed inside the hemisphere; adjusting and centering the upper and lower positions of the phantom, so that the rotational symmetry axis of the ultrasound probe coincides with the rotational symmetry axis of the phantom; in the phantom, using target lines embedded in the background tissue-like material as the imaging target for reflective imaging, and obtaining a three-dimensional reflective image of the background tissue-like material and the target line distribution by scanning and imaging the distributed target lines; segmenting an ultrasound grayscale image of a scanning plane perpendicular to the target line direction using display software based on the three-dimensional reflective image to obtain a reflective image on the coronal plane; determining the imaging parameters of the three-dimensional ultrasound imaging device at the corresponding position on the coronal plane based on the reflective image on the coronal plane, including the lateral linearity, longitudinal linearity, axial resolution, and lateral resolution of the reflective image on the coronal plane.

[0011] In some possible implementations, determining the resolution of the three-dimensional ultrasound imaging device at a corresponding position on the coronal plane based on the reflected image on the coronal plane includes: processing the reflected image on the coronal plane to determine a transverse linear target group and a longitudinal linear target group; the transverse linear target group is arranged transversely from the left to the right side of the phantom through the center point; the longitudinal linear target group is arranged longitudinally from the upper side to the lower side of the phantom through the center point; sequentially measuring the distance between adjacent target lines in the longitudinal and transverse linear target groups; determining the geometric positional accuracy of the three-dimensional ultrasound imaging device on the coronal plane based on the distance between adjacent target lines and a first nominal value, where the first nominal value is a set value for the transverse / longitudinal target line distance; determining the transverse linearity of the three-dimensional ultrasound imaging device on the coronal plane at different detection depths based on the distance between adjacent target lines in the transverse linear target group and the first nominal value; and determining the longitudinal linearity of the three-dimensional ultrasound imaging device on the coronal plane at different detection depths based on the distance between adjacent target lines in the longitudinal linear target group and the first nominal value.

[0012] In some possible implementations, the imaging parameters of the three-dimensional ultrasound imaging device at the corresponding position on the coronal plane are determined based on the reflected image on the coronal plane, including: processing the reflected image on the coronal plane to determine the axial and lateral target group; the axial and lateral target group is distributed in the axial and lateral directions passing through the same center point; the number and distribution of target lines in the axial and lateral target group are set according to calibration requirements; the axial resolution of the three-dimensional ultrasound imaging device on the coronal plane at different detection depths is determined based on the distance between each two adjacent target lines in the axial direction of the axial and lateral target group and the second nominal value.

[0013] In some possible implementations, the imaging parameters of the three-dimensional ultrasound imaging device at the corresponding position on the coronal plane are determined based on the reflected image on the coronal plane, including: processing the reflected image on the coronal plane to determine the axial-lateral target group; the axial-lateral target group is distributed in the axial and lateral directions passing through the same center point; the number and distribution of target lines in the axial-lateral target group are set according to calibration requirements; and the lateral resolution of the three-dimensional ultrasound imaging device on the coronal plane at different detection depths is determined based on the distance between each two adjacent target lines in the lateral direction of the axial-lateral target group and the second nominal value.

[0014] In some possible implementations, the imaging parameters also include imaging uniformity, measurement accuracy, perimeter and area measurement deviations. Determining the imaging parameters of the three-dimensional ultrasound imaging device at the corresponding position on the coronal plane based on the reflected image on the coronal plane further includes: processing the reflected image on the coronal plane to determine imaging uniformity; imaging uniformity refers to the consistency of brightness and color distribution from the center to the edge of the ultrasound reflected image, affecting the overall image quality and visual effect; processing the reflected image on the coronal plane to determine measurement accuracy, which is an indicator of how close the measurement result of the ultrasound reflected image is to the true value; processing the reflected image on the coronal plane to determine perimeter deviation, which is the difference between the perimeter measured by the ultrasound reflected image and the calibrated perimeter; and processing the reflected image on the coronal plane to determine area measurement deviation, which is the difference between the area measured by the ultrasound reflected image and the area specified by the design or standard.

[0015] Thirdly, this application provides a computing device, comprising: at least one memory for storing a program; and at least one processor for executing the program stored in the memory, wherein when the program stored in the memory is executed, the processor is configured to execute the method as described in any one of the second aspects.

[0016] Fourthly, this application provides a computer-readable storage medium storing a computer program that, when run on a processor, causes the processor to perform the method as described in any of the second aspects. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the various embodiments disclosed in this specification, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only a few embodiments disclosed in this specification. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] The accompanying drawings used in the description of the embodiments or prior art are briefly introduced below.

[0019] Figure 1 This is a schematic diagram of the clinical implementation of a hemispherical three-dimensional ultrasound imaging device.

[0020] Figure 2 This is an external view of the phantom used for coronal plane reflection detection in a three-dimensional imaging device, provided in an embodiment of this application.

[0021] Figure 3 This is a perspective view of the phantom structure provided in the embodiments of this application;

[0022] Figure 4 A schematic diagram of the three-dimensional structural segmentation of a standing human body in an ultrasound transmission image;

[0023] Figure 5 This is a top view of a phantom structure for coronal plane reflection detection of a three-dimensional imaging device provided in an embodiment of this application;

[0024] Figure 6 This is a distribution map of axial-lateral target groups on the coronal plane provided in an embodiment of this application;

[0025] Figure 7 This is a schematic diagram of ultrasonic scanning section segmentation of an ultrasonic imaging device provided in Embodiment 1 of this application;

[0026] Figure 8 This is a schematic diagram illustrating the application scenario of the tissue phantom provided in Embodiment 1 of this application.

[0027] Figure 9 This is a flowchart of the coronal plane reflection detection method for a three-dimensional imaging device provided in Embodiment 1 of this application.

[0028] Figure label:

[0029] 11. Hemispherical three-dimensional ultrasound imaging equipment; 12. Water; 13. Subject; 14. Equipment bed;

[0030] 201. Tissue-like phantom; 202. Top panel; 203. Acoustic window; 204. Background tissue-like material; 205. Suspension screw; 206. T-shaped fixing post; 207. Sealing rubber; 208. Protective ring; 209. Target line; 210. Maintenance hole;

[0031] 401. Lateral linear target group; 402. Longitudinal linear target group; 403. First axial target group; 404. Second axial target group; 405. Third axial target group;

[0032] 51. Ultrasonic array probe; 52. Array element; 53. Water; 54. Coronal plane; 55. Sagittal / transverse plane. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application will be described below with reference to the accompanying drawings.

[0034] In the description of the embodiments of this application, the words "exemplary," "for example," or "for instance" are used to indicate examples, illustrations, or explanations. Any embodiment or design described as "exemplary," "for example," or "for instance" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of the words "exemplary," "for example," or "for instance" is intended to present the relevant concepts in a specific manner.

[0035] In the description of the embodiments in this application, the term "and / or" is merely a description of the association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, B existing alone, and A and B existing simultaneously. Furthermore, unless otherwise stated, the term "multiple" means two or more. For example, multiple systems refer to two or more systems, and multiple terminals refer to two or more terminals.

[0036] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. The terms "comprising," "including," "having," and their variations all mean "including but not limited to," unless otherwise specifically emphasized.

[0037] In the description of the embodiments in this application, "some embodiments" are mentioned, which describe a subset of all possible embodiments. However, it is understood that "some embodiments" can be the same subset or different subsets of all possible embodiments, and can be combined with each other without conflict.

[0038] In the description of the embodiments of this application, the terms "first, second, third, etc." or module A, module B, module C, etc. are used only to distinguish similar objects and do not represent a specific ordering of objects. It is understood that, where permitted, a specific order or sequence can be interchanged so that the embodiments of this application described herein can be implemented in an order other than that illustrated or described herein.

[0039] In the description of the embodiments of this application, the reference numerals for the steps, such as S110, S120, etc., do not necessarily indicate that the steps will be executed in this manner. Where permissible, the order of the steps can be interchanged or executed simultaneously.

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing embodiments of this application only and is not intended to limit this application.

[0041] Three-dimensional ultrasound imaging equipment includes three-dimensional ultrasound computed tomography (USCT) equipment. USCT typically uses a hemispherical array of ultrasound transducers to perform electronic scanning tomography on the human body (such as the breast) in a water tank.

[0042] Three-dimensional ultrasound computed tomography uses a hemispherical ultrasound array probe to directly scan and image the breast in water. Its imaging modes include reflection imaging mode, which uses ultrasound reflection waves similar to conventional B-mode ultrasound, and sound velocity measurement imaging mode and sound attenuation mode, which use transmitted wave signals.

[0043] Figure 1 This is a schematic diagram illustrating the clinical implementation of a hemispherical three-dimensional ultrasound imaging device. (For example...) Figure 1 As shown, the hemispherical three-dimensional ultrasound imaging device 11 (hereinafter referred to as the imaging device) uses an array of ultrasound probes to perform three-dimensional scanning imaging of the human breast. Its array elements are distributed inside the hemisphere, and the overall structure of the hemispherical space is a semi-enclosed water tank, where the water typically needs to be degassed. During the procedure, the subject 13 lies prone on the device bed 14, with the breast to be tested completely submerged in the water 12. The ultrasound signals emitted by the device through the ultrasound transducer array elements propagate in the water and through the breast. The reflected and scattered sound waves within the breast are received by the corresponding ultrasound transducer array elements.

[0044] The imaging device 11 performs scanning imaging based on the reflected and scattered signals received by the ultrasonic transducer array and outputs a reflected image.

[0045] If the ultrasonic transducer array element receives the transmitted signal of the ultrasonic signal, then a color transmission image is synthesized and output through an algorithm.

[0046] exist Figure 1 In the provided application scenarios, ultrasound computed tomography imaging equipment, as a medical device, is typically tested for imaging performance and quality using tissue phantoms. Similarly, for imaging equipment 11, which uses a hemispherical ultrasound array probe for direct 3D imaging, the imaging quality also requires testing using tissue phantoms.

[0047] Tissue phantoms are "tissue substitutes" rather than measuring instruments, and there are no standards in the metrological sense. At present, it is impossible to perform metrological verification or calibration, which directly affects the determination of whether the imaging quality of ultrasound diagnostic equipment is qualified.

[0048] Due to the unique structure and imaging algorithm of the hemispherical three-dimensional ultrasound array probe, it is necessary to detect the acoustic field of the ultrasound array arranged on the inner side of the hemisphere. Therefore, the tissue phantom used for quality inspection of the hemispherical ultrasound array probe is completely different in design from the existing tissue phantom used for quality inspection of conventional ultrasound tomography imaging equipment, requiring completely different structures and technologies.

[0049] In view of this, embodiments of this application propose a phantom for coronal plane reflection detection of a three-dimensional imaging device, so as to quantitatively detect and verify parameters such as the reflection imaging resolution and transmission depth of the coronal plane at a certain depth.

[0050] The phantom is mainly composed of a top panel, an acoustic window, internally embedded target lines, and a background tissue-mimicking material (TMM). It is a passive device specifically designed to examine the coronal plane reflection imaging resolution of a hemispherical three-dimensional ultrasound imaging device 11.

[0051] For example, Figure 2 An external view of a phantom for coronal plane reflection detection in a three-dimensional imaging device, provided as an embodiment of this application. Figure 2 As shown, it includes:

[0052] The tissue-mimicking phantom 201 has a cylindrical structure with standard geometric parameters, making it easy to quantify numerical analysis or computer simulation. It is used to simulate the coronal plane of breast reflective images. The structure mainly consists of a top panel 202, an acoustic window 203, internally embedded measurement target lines 209, and a background tissue-mimicking material (TMM) 204.

[0053] Furthermore, the outer shell of the tissue-simulating phantom 201 is surrounded by a top panel 202 and an acoustic window 203. Its internal sealed space is filled with a background tissue-simulating material 204, in which target wires 209 are embedded. This outer shell, except for the top panel 202 side, is acoustically transparent, allowing ultrasonic waves to enter and exit from multiple angles through the acoustic window 203.

[0054] In some possible implementations, the upper panel 202 is the main component, made of plastic sheets such as plexiglass, ABS plastic, or PVC plastic (polyvinyl chloride), and its function is to provide mechanical support and sealing for the mold. Plexiglass is chemically known as polymethyl methacrylate (PMMA), PVC plastic is chemically known as polyvinyl chloride, and ABS plastic is acrylonitrile-butadiene-styrene plastic.

[0055] The acoustic window 203 is made of thermoplastic material or heat-cured polyurethane rubber (TPU) film with a thickness of 50μm-300μm. It is an acoustically transparent cylindrical structure that can simulate the aggregate of the coronal plane of the mammary gland reflection image.

[0056] The acoustic window 203 surrounds the background tissue-like material 204, serving as a seal and protection, while also acting as a window for ultrasonic wave transmission. Its material and thickness simulate the acoustic characteristics of human epidermal tissue.

[0057] Background tissue-mimicking material 204 uses materials that mimic the acoustic parameters of human soft tissue. The materials include water-based polymer gel-based composite materials. The acoustic parameters of this material include standard sound velocity parameters and sound attenuation coefficients, where the sound velocity is (1540±10) m / s and the slope of the sound attenuation coefficient of the ultrasonic tissue-mimicking (TM) material is (0.70±0.05) dB / (cm·MHz) or (0.50±0.05) dB / (cm·MHz). All of the above parameters are values ​​measured under the condition of [(23±3)℃].

[0058] Several suspension screws 205 are evenly arranged around the perimeter on the upper panel 202. The threads of the suspension screws 205 are upward, which are used to connect the phantom to the suspension device, so that the phantom is suspended as a whole in the hemispherical ultrasound array imaging area.

[0059] The upper panel 202 and the acoustic window 203 are sealed together by adhesive bonding to maintain the seal of the internal space.

[0060] In some possible implementations, the adhesive joint can be reinforced by a protective ring 208 to protect the adhesive joint and prevent the overall structure from falling off and being damaged.

[0061] Several T-shaped fixing posts 206 are fixed under the upper panel 202. The T-shaped posts are inverted T-shaped, with the head discs embedded in the background tissue material 204. The T-shaped fixing posts are used to achieve an integrated connection between the upper panel 202 and the background tissue material 204.

[0062] For example, Figure 3 This is an internal perspective structural diagram of a phantom used for coronal plane reflection detection in a three-dimensional imaging device, provided in an embodiment of this application. (See diagram below.) Figure 3 As shown, a maintenance hole 210 is provided at the edge of the upper panel 202, which serves as a channel for filling the background tissue material 204. The maintenance hole 210 is sealed by a highly elastic sealing rubber 207. The sealing rubber 207 serves as a sealing plug and an inlet for liquid injection and air extraction during the maintenance of the background tissue material 204.

[0063] The background tissue-like material 204 is the core component of the ultrasonic phantom, but variations in its composition, state, and acoustic properties can lead to functional failure. The liquid contained within may be lost through evaporation from the gaps in the phantom shell. After prolonged use, the background tissue-like material 204 may lose water and shrink. In cases of severe water loss, the phantom may become completely unusable and irrecoverable.

[0064] In view of this, in the tissue-simulating phantom 201 provided in the embodiments of this application, the background tissue-simulating material 204 is maintainable and can be maintained daily using an aqueous maintenance solution, the liquid composition of which is the same as that of the background tissue-simulating material.

[0065] In some possible implementations, the aqueous maintenance solution can be injected using an injection needle through the sealing rubber 207 at the bottom; the aqueous maintenance solution needs to be specially formulated to suit the background tissue-like material 204.

[0066] The frequency of routine maintenance depends on the temperature and humidity environment in which the mannequin is located. Regularly replenishing the maintenance solution can greatly extend the lifespan of the mannequin.

[0067] The target wire 209 is made of nylon wire with a diameter of 0.1mm-0.3mm. Each target wire runs vertically from the upper panel 202 to the lower plane of the cylindrical acoustic window 203. The upper end of the target wire 209 is fixed in the opening of the upper panel 202, and the lower end is free. All target wires are embedded in the background tissue-like material 204.

[0068] The target line 209 is used to quantitatively measure the imaging parameters of the coronal plane. The coronal plane is the plane parallel to the horizontal plane when the human body is lying prone on the three-dimensional ultrasound imaging device. The imaging parameters include the lateral linearity, longitudinal linearity, axial resolution, lateral resolution, imaging uniformity, measurement accuracy, and perimeter and area measurement deviation of the reflected image in the coronal plane.

[0069] For example, Figure 4 This is a schematic diagram of the three-dimensional structural segmentation of a standing human body in an ultrasound transmission image. (Example:) Figure 4 As shown, the transverse direction refers to the direction indicated by the coronal axis on the coronal plane, the longitudinal direction refers to the direction indicated by the vertical axis on the coronal plane that is perpendicular to the coronal axis, the axial direction is the direction on the coronal plane that passes through the center point and points to the tangent point of the arc, and the lateral direction is the direction indicated by the circumferential arc on the coronal plane at a specified distance from the center point. The center point is the intersection of the coronal axis and the vertical axis on the coronal plane.

[0070] Therefore, in this application, lateral linearity is the linearity of the ultrasound reflection image in the coronal plane along the coronal axis.

[0071] Longitudinal linearity is the linearity of an image along its vertical axis in the coronal plane.

[0072] Axial resolution is the resolution of an image on the coronal plane in the direction from the center point to the tangent point of the arc.

[0073] Lateral resolution is the resolution of an image along a circular arc at a specified distance from the center point on the coronal plane.

[0074] Image resolution is determined by the minimum distance between the centers of two clearly separable adjacent target lines on the coronal plane of the image; the distance between the centers of two adjacent target lines is a predetermined distance. The same preload is applied to each target line to ensure uniform tension, thereby maintaining a stable distance between adjacent target lines.

[0075] Imaging uniformity refers to the consistency of brightness and color distribution from the center to the edge of an ultrasonic reflection image, which affects the overall image quality and visual effect.

[0076] Measurement accuracy is an indicator of how close the measurement results of ultrasonic reflection images are to the true values. The higher the accuracy, the smaller the measurement error.

[0077] Perimeter deviation is the difference between the perimeter measured by ultrasonic reflection imaging and the perimeter specified by the design or standard.

[0078] Area measurement deviation is the difference between the area measured by ultrasonic reflection imaging and the area specified by the design or standard.

[0079] For example, Figure 5 This is a top view of a phantom structure for coronal plane reflection detection in a three-dimensional imaging device, provided in an embodiment of this application. (See attached image.) Figure 5 As shown, the upper panel 202 has several target line openings made by precision machining to position the target lines. The position of the target lines and the size of the holes are all machined by precision CNC machine tools to ensure the accuracy of the hole positioning and spacing.

[0080] The target line 209 is embedded in the background tissue-like material. The target line 209 is divided into different target groups according to different uses, including transverse linear target group 401, longitudinal linear target group 402, and axial lateral target group. Each target group includes multiple target lines.

[0081] The transverse linear target group 401 is used to determine the transverse linearity of the three-dimensional ultrasound imaging device on the coronal plane at different detection depths. Multiple target lines in the transverse linear target group 401 are arranged linearly according to the order of their transverse spacing.

[0082] The longitudinal linear target group 402 is used to determine the longitudinal linearity of the three-dimensional ultrasound imaging equipment on the coronal plane at different detection depths. Multiple target lines in the longitudinal linear target group 402 are arranged linearly according to their longitudinal spacing.

[0083] The axial and lateral target groups are used to determine the axial and lateral resolution of the three-dimensional ultrasound imaging equipment on the coronal plane at different detection depths from the acoustic window 203; the axial and lateral target groups include the first axial and lateral target group 403, the second axial and lateral target group 404, and the third axial and lateral target group 405.

[0084] The first axial-lateral target group 403, the second axial-lateral target group 404, and the third axial-lateral target group 405 are used to determine the axial resolution and lateral resolution of the three-dimensional ultrasound imaging device on the coronal plane at the first detection depth, the second detection depth, and the third detection depth of the acoustic window, respectively.

[0085] The target group 401-405 can quantitatively measure multiple imaging parameters at different depths and positions in the coronal plane reflection mode, including the lateral linearity, longitudinal linearity, image resolution at different depths in the axial and lateral directions, imaging uniformity, measurement accuracy, perimeter and area measurement deviation, etc.

[0086] The setting area of ​​the horizontal linear target group 401 and the vertical linear target group 402 is from the top panel to the bottom of the sound window. The center distance between adjacent lines is a set distance. For example, the set distance is a first distance; for example, the first distance is 10mm.

[0087] For example, the projection of the transverse linear target group 401 on the top plate is arranged transversely from left to right through the center point, and the center distance between adjacent lines is 10mm.

[0088] The longitudinal linear target group 402 is projected onto the upper plate and is arranged longitudinally from the top to the bottom, passing through the center point. The center-to-center distance between adjacent lines is also the first distance.

[0089] For example, Figure 6 This is a distribution map of axial-lateral target groups on the coronal plane provided in an embodiment of this application. For example... Figure 6 As shown, since the coronal plane is a plane parallel to the upper panel during measurement, the projections of the same group of axial-lateral target groups on the coronal plane are all distributed axially and laterally passing through the same center point; the number and distribution of target lines in the axial-lateral target group can be set according to calibration needs, such as 4, 8, 10, etc. Figure 6 The given 12 target lines , , , , , , , , , .

[0090] The distance between any two adjacent target lines along the axial direction is a predetermined axial distance; for example, the predetermined axial distance includes a first axial distance. Second axial distance Third axial distance Fourth axial distance and the distance along the fifth axis The first, second, third, fourth, and fifth axial distances increase or decrease sequentially according to their distance from the target line center. The set axial distances are used to calibrate the axial resolution of the three-dimensional ultrasound imaging equipment at corresponding positions in the coronal plane. Axial resolution is determined by the minimum distance between the centers of two adjacent target lines that can be clearly separated along the coronal plane in the image.

[0091] For example, the first axial distance, the second axial distance, the third axial distance, the fourth axial distance, the fifth axial distance, and the sixth axial distance can be set to 0.3mm, 0.5mm, 1mm, 2mm, and 3mm respectively.

[0092] The distance between any two adjacent target lines in the lateral direction is a predetermined lateral distance; for example, the predetermined lateral distance includes a first lateral distance. Second lateral distance Third lateral distance Fourth lateral distance and fifth lateral distance The first, second, third, fourth, and fifth lateral distances increase or decrease sequentially according to their distance from the center of the target line. These lateral distances are used to calibrate the lateral resolution of the three-dimensional ultrasound imaging equipment at corresponding positions in the coronal plane. Lateral resolution is determined by the minimum distance between the centers of two clearly separable adjacent target lines in the coronal plane of the image.

[0093] For example, the first lateral distance, the second lateral distance, the third lateral distance, the fourth lateral distance, the fifth lateral distance, and the sixth lateral distance can be set to 3mm, 2mm, 1mm, 0.5mm, and 0.3mm respectively.

[0094] The imaging of the target group at different depths is used to detect the scanning capability of the three-dimensional ultrasound scanning imaging equipment on the coronal plane at different detection depths, thereby obtaining the resolution of the three-dimensional ultrasound scanning imaging equipment in various directions on the coronal plane at different detection depths.

[0095] The phantom for coronal plane resolution testing provided in this application embodiment is specifically designed for the detection and evaluation of coronal plane reflection imaging resolution and performance of hemispherical array ultrasound tomography imaging equipment, compared to existing similar products.

[0096] In this tissue-like phantom, a target line with one end fixed and the other end suspended serves as the imaging target for the ultrasonic reflection grayscale image. By designing the target line distribution, the resolution of axial and lateral target groups can be measured, and the longitudinal and transverse detection depths can be tested.

[0097] In some possible implementations, the phantom provided in this application is applied to a hemispherical three-dimensional ultrasound device to detect and calibrate the reflection imaging quality of the coronal plane in reflection mode.

[0098] In some possible implementations, the phantom provided in this application is applied to an enclosed probe device with a rotating scanning structure to detect and calibrate the coronal plane reflection imaging quality in reflection mode.

[0099] The mold provided in this application embodiment is maintainable. Maintenance liquid can be injected through the maintenance hole to maintain the stability of the composition of the internal materials of the mold, which can greatly increase the service life of the mold.

[0100] Example 1

[0101] Based on the above Figure 2 and Figure 3 , Figure 4 The tissue phantom described in some or all of the embodiments of this application provides an example of applying the phantom to the coronal plane reflection imaging performance testing of an imaging device.

[0102] For example, Figure 7 This is a schematic diagram of the ultrasonic scanning section segmentation of the ultrasonic imaging device provided in Embodiment 1 of this application. The ultrasonic device probe is a hemispherical ultrasonic array probe 51, and its array elements 52 have radiation surfaces distributed on the inner side of the hemisphere. The overall structure of the hemispherical space is a semi-enclosed water tank, and the water in it usually needs to be degassed.

[0103] In this embodiment, the three-dimensional ultrasonic field of the ultrasonic probe can be decomposed into coronal plane imaging detection and sagittal / transverse plane imaging detection, wherein the coronal plane 54 and the sagittal / transverse plane 55 are distinguished by determining the cross-section when the human body is lying prone on the device.

[0104] Under this standard, the coronal plane 54 is the plane parallel to the horizontal plane when the human body is lying prone on the device, and it is also the plane parallel to the horizontal plane or the upper panel when the body membrane is placed on the device.

[0105] The sagittal / transverse plane 55 is a plane perpendicular to the horizontal plane, and the imaging sound field on this plane is completely different from that on the coronal plane.

[0106] Due to the axisymmetric characteristics of the transducer and sound field of the hemispherical three-dimensional ultrasound imaging equipment, the sagittal plane and the cross-section have 90° rotational symmetry, and the detection directions are equivalent, so they can be combined into the same detection item.

[0107] Specifically, in Embodiment 1 of this application, on the imaging plane of the coronal plane, the imaging device spontaneously and automatically receives the acoustic reflection and acoustic scattering signals in the target through a hemispherical distributed three-dimensional ultrasonic transducer array, and performs two-dimensional brightness modulation on the amplitude of the received echo signal to perform grayscale imaging.

[0108] For example, Figure 8 This is a schematic diagram illustrating an application scenario for the tissue-simulating phantom provided in Embodiment 1 of this application. For example... Figure 8 As shown, the imaging device is filled with water in a hemispherical water tank. The tissue phantom 201 is placed in the water 53 and suspended in the water by suspension screws. The tissue phantom is suspended in the imaging area of ​​the ultrasound probe to ensure that the symmetry axis of the phantom coincides with the axis of the hemispherical array of the ultrasound device. Measures are taken to remove air bubbles attached to the acoustic window.

[0109] The structural features of tissue phantoms can be referenced. Figure 2 and Figure 3 , Figure 4 Some or all of the implementation methods are not described here.

[0110] In the application scenario provided in Embodiment 1 of this application, the imaging device performs inversion measurement and imaging of the ultrasonic longitudinal wave velocity or attenuation value inside the simulated tissue phantom material, and displays the material sound velocity and sound attenuation distribution and quantitative value in real time.

[0111] Its imaging modes include B-mode imaging using ultrasound reflected wave signals and transmission mode using transmitted wave signals. The transmission mode includes sound velocity measurement imaging mode and sound attenuation mode.

[0112] The three-dimensional ultrasonic sound field is formed by the propagation of ultrasonic signals emitted by a hemispherical ultrasonic probe array between the background biomimetic tissue material and the target line.

[0113] In light of this scenario, Embodiment 1 of this application also provides a method for detecting coronal plane reflectance imaging performance.

[0114] For example, Figure 9 This is a flowchart of the coronal plane reflection detection method for a three-dimensional imaging device provided in Embodiment 1 of this application, as follows: Figure 9 As shown, it includes the following steps:

[0115] S71, turn on the imaging device 11, and set all array elements of the hemispherical ultrasonic array probe to transmit-receive mode; the radiation surface of the array elements is distributed on the inner side of the hemisphere.

[0116] S72, adjust the up and down position of the ultrasound probe 51 so that the rotational symmetry axis of the ultrasound probe coincides with the rotational symmetry axis of the phantom.

[0117] In the phantom, target lines embedded in the background tissue-like material are used as the imaging target for transmission imaging. By scanning the distributed target lines, a three-dimensional reflection image of the background tissue-like material and the distribution of target lines is obtained.

[0118] S73, based on the three-dimensional reflection image, the ultrasonic grayscale image of the scanning plane perpendicular to the target line direction is segmented by the display software to obtain the reflection image on the coronal plane.

[0119] S74, based on the reflected image on the coronal plane, determine the imaging parameters of the three-dimensional ultrasound imaging device at the corresponding position on the coronal plane, including the lateral linearity, longitudinal linearity, axial resolution, and lateral resolution of the reflected image on the coronal plane. Specifically, this includes the following steps:

[0120] S741 is used for measuring geometric position accuracy / geometric error.

[0121] First, the image is frozen. Then, using an electronic vernier ranging system, the distance between adjacent target lines in the longitudinal and transverse linear target groups is measured sequentially. Finally, the geometric positional accuracy of the three-dimensional ultrasound imaging device on the coronal plane is determined based on the distance between adjacent target lines and the first nominal value, which is the set value for the distance between transverse and longitudinal target lines.

[0122] In some possible implementations, the target with the largest difference from the nominal value (10mm) can be identified from each target group as xi. For example, if the nominal value given to the phantom at the factory is x0, then the geometric position accuracy is: |(xi-x0) / x0|×100%. The electronic vernier ranging system is configured for the hemispherical three-dimensional imaging device being inspected.

[0123] In some possible implementations, the lateral linearity of the three-dimensional ultrasound imaging device in the coronal plane at different detection depths can be determined based on the spacing between adjacent target lines in the lateral linear target group and a first nominal value.

[0124] In some possible implementations, the longitudinal linearity of the three-dimensional ultrasound imaging device in the coronal plane at different detection depths can be determined based on the spacing between adjacent target lines in the longitudinal linear target group and a first nominal value.

[0125] S742, for axial lateral resolution measurement.

[0126] In some possible implementations, the reflected image on the coronal plane can be processed to determine the axial-lateral target group; the axial-lateral target group is distributed axially and laterally through the same center point; the number and distribution of target lines in the axial-lateral target group are set according to calibration requirements; the axial resolution of the three-dimensional ultrasound imaging device on the coronal plane at different detection depths is determined based on the distance between each two adjacent target lines in the axial direction of the axial-lateral target group and the second nominal value.

[0127] Specifically, it includes the following steps:

[0128] S7421 reduces gain and processes the reflection image on the coronal plane to obtain the target line image.

[0129] In some possible implementations, the scattered light spots generated by the background TM material 204 can be concealed to obtain a clean target line image.

[0130] S7422, based on the target line image, sequentially reads the target line spacing that can be clearly separated along the axial direction in the lateral target group, and obtains the resolution at the depth of each line based on the minimum value among them.

[0131] For example, the target line spacings that can be clearly separated axially in the first target group are read sequentially from the axial direction, including the first axial distance. 0.3mm, second axial distance 0.5mm, third axial distance 1mm, fourth axial distance 2mm and the fifth axial distance If the resolution is 3mm, then the axial resolution is 0.3mm.

[0132] If the first axial distance Unable to identify, but the second axial distance can be clearly identified. If the resolution is 0.5mm, then the axial resolution is 0.5mm.

[0133] S743, used for lateral resolution measurement.

[0134] In some possible implementations, the reflected image on the coronal plane can be processed to determine the axial-lateral target group; the axial-lateral target group is distributed in the axial and lateral directions passing through the same center point; the number and distribution of target lines in the axial-lateral target group are set according to calibration requirements; the lateral resolution of the three-dimensional ultrasound imaging device on the coronal plane at different detection depths is determined based on the distance between each two adjacent target lines in the lateral direction of the axial-lateral target group and the fourth nominal value.

[0135] Specifically, it includes the following steps:

[0136] S7431, maintaining a low gain state, processes the reflection image on the coronal plane to obtain the target line image.

[0137] In some possible implementations, the scattered light spots generated by the background TM material 204 can be concealed to obtain a clean target line image.

[0138] S7432, sequentially read the target line spacing that can be clearly separated laterally in the first target group in the axial direction, including the first lateral distance. 3mm, second lateral distance 2mm, third lateral distance 1mm, fourth lateral distance 0.5mm and the fifth lateral distance The resolution is 0.3 mm. Therefore, the lateral resolution is the minimum value of 0.3 mm.

[0139] If the fifth lateral distance Unable to identify, but the fourth lateral distance can be clearly identified. If the resolution is 0.5mm, then the lateral resolution is 0.5mm.

[0140] In some possible implementations, if the lateral resolution of the three-dimensional ultrasound imaging device is less than the minimum set distance of the current lateral first target group (e.g., 0.3 mm), then a finer lateral target group is used for measurement. This finer lateral resolution target group can be designated as the lateral second target group. The minimum spacing value of the lateral second target group is less than the minimum spacing value of the lateral first target group.

[0141] S744 is used to measure other imaging parameters.

[0142] In some possible implementations, the imaging parameters also include imaging uniformity, measurement accuracy, perimeter and area measurement deviations. Determining the imaging parameters of the three-dimensional ultrasound imaging device at the corresponding location on the coronal plane based on the reflected image on the coronal plane further includes:

[0143] The reflected images on the coronal plane are processed to determine the imaging uniformity; imaging uniformity refers to the consistency of brightness and color distribution from the center to the edge of the ultrasound reflected image, which affects the overall image quality and visual effect.

[0144] The reflection images on the coronal plane are processed to determine the measurement accuracy, which is an indicator of how close the ultrasound reflection image measurement results are to the true values.

[0145] The reflection image on the coronal plane is processed to determine the perimeter deviation, which is the difference between the perimeter measured by the ultrasound reflection image and the calibrated perimeter.

[0146] The reflected images on the coronal plane are processed to determine the area measurement deviation, which is the difference between the area measured by the ultrasound reflected image and the area specified by the design or standard.

[0147] S75. After the test using the simulated tissue phantom is completed, remove the simulated tissue phantom from the water, wipe off the water on the surface with a soft towel or similar material, and store it properly.

[0148] This application provides a method for detecting coronal plane resolution, specifically for detecting and evaluating the imaging resolution and performance of a hemispherical array ultrasound tomography imaging device. By using a target line in a tissue phantom, fixed at one end and suspended at the other, as the imaging target for the ultrasound reflection grayscale image, the resolution of axial and lateral target groups can be measured, and the longitudinal and transverse detection depths can be tested. This enables the detection and evaluation of coronal plane reflection imaging quality in reflection mode. Based on quantitative imaging quality parameters such as resolution and imaging accuracy, the imaging capabilities of different three-dimensional ultrasound imaging devices can be compared and evaluated laterally.

[0149] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the embodiments of this application and are not intended to limit the scope thereof. Although the embodiments of this application have been described in detail with reference to the embodiments, those skilled in the art should understand that modifications or equivalent substitutions to the technical solutions of the embodiments of this application do not depart from the spirit and scope of the technical solutions of the embodiments of this application, and all such modifications or substitutions should be covered within the scope of the claims of the embodiments of this application.

Claims

1. A phantom for coronal plane reflection detection in a three-dimensional imaging device, characterized in that, The phantom is used to detect the imaging resolution of a three-dimensional ultrasound imaging device on the coronal plane at a set depth, including: The outer shell is surrounded by a top panel (202) and an acoustic window (203); the sealed space inside the top panel (202) and the acoustic window (203) is filled with a background tissue-like material (204); a target wire (209) is embedded in the background tissue-like material (204). A fixing post (206) is fixed under the upper panel (202). The circular head of the fixing post (206) is embedded in the background tissue material (204). The fixing post (206) is used to make the upper panel (202) and the background tissue material (204) integrated. The acoustic window (203) is an acoustically transparent structure, and its material and thickness simulate the acoustic characteristics of human epidermal tissue; the acoustic window (203) is used as a window for ultrasonic waves to pass through; The background tissue-simulating material (204) is used to simulate the acoustic properties of human soft tissue and has standard sound velocity parameters and sound attenuation coefficient. The target line (209) is a linear object, with its upper end fixed in an opening in the top plate (202) and its lower end free; it is used to quantitatively measure the imaging parameters of the coronal plane, where the coronal plane is the plane parallel to the horizontal plane when the human body lies prone on the three-dimensional ultrasound imaging device. The imaging parameters include the lateral linearity, longitudinal linearity, axial resolution, and lateral resolution of the reflected image on the coronal plane; the lateral linearity is the linearity of the ultrasound reflected image in the coronal axis direction on the coronal plane. The longitudinal linearity is the linearity of the image in the direction perpendicular to the axis on the coronal plane; The axial resolution is the resolution of the image on the coronal plane in the direction from the center point to the tangent point of the arc; the center point is the intersection of the coronal axis and the vertical axis on the coronal plane. The lateral resolution is the resolution of the image in the direction of the circumferential arc at a specified distance from the center point on the coronal plane; The image resolution is determined by the minimum distance between the centers of two adjacent target lines that can be clearly separated on the coronal plane of the image; the distance between the centers of the two adjacent target lines is a set distance; the set distance is used to calibrate the image resolution of the three-dimensional ultrasound imaging device at the corresponding position on the coronal plane.

2. The phantom according to claim 1, characterized in that, The target line (209) is distributed into multiple target groups according to different uses, including lateral linear target groups, longitudinal linear target groups, and axial lateral target groups; The lateral linear target group is used to determine the lateral linearity of the three-dimensional ultrasound imaging device on the coronal plane at different detection depths. The longitudinal linear target group is used to determine the longitudinal linearity of the three-dimensional ultrasound imaging device on the coronal plane at different detection depths; The axial and lateral target groups are used to determine the axial and lateral resolution of the three-dimensional ultrasound imaging device on the coronal plane at different detection depths from the acoustic window (203); the axial and lateral target groups include an axial and lateral first target group, an axial and lateral second target group, and an axial and lateral third target group; Each target group comprises multiple target lines.

3. The phantom according to claim 2, characterized in that, The horizontal linear target group is arranged horizontally from the left to the right of the phantom, passing through the center point, and the center-to-center distance between two adjacent target lines is a set first distance. The longitudinal linear target group is arranged longitudinally from the top side of the phantom to the bottom side passing through the center point, and the center-to-center distance between two adjacent target lines is a set first distance; The axial and lateral target groups are distributed on the coronal plane in both the axial and lateral directions passing through the center point. The distance between two adjacent target lines in the axial direction is a set axial distance, and the distance between two adjacent target lines in the lateral direction is a set lateral distance. The axial direction is the direction on the coronal plane passing through the center point and pointing towards the tangent point of the arc. The lateral direction is the direction indicated by the circumferential arc on the coronal plane at a specified distance from the center point.

4. The phantom according to claim 1 or 2, characterized in that, The upper panel (202) has several target line openings made by precision machining, and the openings are used to position and measure the target line (209). The target line (209) extends vertically from the upper panel (202) to the lower plane of the acoustic window (203).

5. A method for testing the coronal plane reflectance imaging performance of a three-dimensional imaging device, characterized in that, The phantom for detecting coronal plane reflectance imaging performance as described in any one of claims 1-4 is placed in water, suspending the phantom in the imaging area of ​​the ultrasound probe; the ultrasound probe is a hemispherical ultrasound probe array disposed inside the imaging device; the method includes: The ultrasonic probe is set to transmit-receive mode; the radiating surface of the ultrasonic probe is distributed on the inner side of the hemisphere. Adjust the vertical position of the body membrane and center it so that the rotational symmetry axis of the ultrasound probe coincides with the rotational symmetry axis of the phantom; In the phantom, target lines embedded in the background tissue-like material are used as the imaging target for reflective imaging. By scanning and imaging the distributed target lines, a three-dimensional reflective image of the background tissue-like material and the distribution of target lines is obtained. Based on the three-dimensional reflection image, an ultrasonic grayscale image of a scanning plane perpendicular to the target line direction is segmented using display software to obtain the reflection image on the coronal plane; The imaging parameters of the three-dimensional ultrasound imaging device at the corresponding position on the coronal plane are determined based on the reflected image on the coronal plane. The imaging parameters include the lateral linearity, longitudinal linearity, axial resolution, and lateral resolution on the coronal plane.

6. The method according to claim 5, characterized in that, Determining the imaging parameters of the three-dimensional ultrasound imaging device at the corresponding position on the coronal plane based on the reflected image on the coronal plane includes: The transverse linear target group and the longitudinal linear target group are determined by processing the reflection image on the coronal plane; the transverse linear target group is arranged transversely from the left side to the right side of the phantom, passing through the center point; the longitudinal linear target group is arranged longitudinally from the upper side to the lower side of the phantom, passing through the center point. Sequentially measure the distance between adjacent target lines in the longitudinal linear target group and the transverse linear target group; The geometric positional accuracy of the three-dimensional ultrasound imaging device in the coronal plane is determined based on the adjacent target line spacing and the first nominal value; the first nominal value is the set value of the transverse / longitudinal target line spacing. The lateral linearity of the three-dimensional ultrasound imaging device on the coronal plane at different detection depths is determined based on the spacing between adjacent target lines in the lateral linear target group and the first nominal value. The longitudinal linearity of the three-dimensional ultrasound imaging device on the coronal plane at different detection depths is determined based on the spacing between adjacent target lines in the longitudinal linear target group and the first nominal value.

7. The method according to claim 5, characterized in that, Determining the imaging parameters of the three-dimensional ultrasound imaging device at the corresponding position on the coronal plane based on the reflected image on the coronal plane includes: The reflected image on the coronal plane is processed to determine the axial-lateral target group; the axial-lateral target group is distributed in the axial and lateral directions passing through the same center point; the number and distribution of target lines in the axial-lateral target group are set according to calibration requirements; The axial resolution of the three-dimensional ultrasound imaging device on the coronal plane at different detection depths is determined based on the distance between each two adjacent target lines in the axial direction of the lateral target group and the second nominal value.

8. The method according to claim 5, characterized in that, Determining the imaging parameters of the three-dimensional ultrasound imaging device at the corresponding position on the coronal plane based on the reflected image on the coronal plane includes: The reflected image on the coronal plane is processed to determine the axial-lateral target group; the axial-lateral target group is distributed in the axial and lateral directions passing through the same center point; the number and distribution of target lines in the axial-lateral target group are set according to calibration requirements; The lateral resolution of the three-dimensional ultrasound imaging device on the coronal plane at different detection depths is determined based on the distance between each two adjacent target lines in the lateral direction of the axial target group and the second nominal value.

9. The method according to claim 8, characterized in that, The imaging parameters also include imaging uniformity, measurement accuracy, and perimeter and area measurement deviation. The imaging parameters of the three-dimensional ultrasound imaging device at the corresponding position on the coronal plane are determined based on the reflected image on the coronal plane, and further include: The reflected image on the coronal plane is processed to determine the imaging uniformity; the imaging uniformity refers to the consistency of brightness and color distribution from the center to the edge of the ultrasound reflected image, which affects the overall image quality and visual effect. The reflection image on the coronal plane is processed to determine the measurement accuracy, which is an indicator of how close the ultrasound reflection image measurement result is to the true value. The reflection image on the coronal plane is processed to determine the perimeter deviation, which is the difference between the perimeter measured by the ultrasound reflection image and the calibrated perimeter. The reflected image on the coronal plane is processed to determine the area measurement deviation, which is the difference between the area measured by the ultrasound reflected image and the area specified by the design or standard.

10. A computing device, comprising: At least one memory for storing programs; At least one processor for executing a program stored in the memory, and at least one transducer for emitting and receiving ultrasonic waves; When the program stored in the memory is executed, the processor and transducer are used to perform the method as described in any one of claims 5-9.

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