Photoacoustic ultrasonic imaging resolution test tool and imaging resolution test equipment

Abstract

The utility model provides a kind of photoacoustic ultrasonic imaging resolution test tool and imaging resolution test equipment, it includes: support plate, test liquid container on support plate, the equipment to be measured fixed structure on test liquid container, test element fixed structure inside test liquid container, test element on test element fixed structure, and drive assembly on support plate and with test element fixed structure connection;Wherein, support plate is used to be placed horizontally on test platform;Test liquid container is equipped with test cavity for containing test liquid;The equipment to be measured fixed structure is used for fixing the equipment to be measured, so that the equipment to be measured is located in test cavity;Test element fixed structure is used for fixing test element and so that test element is located in test cavity;Drive assembly is used to drive test element fixed structure relative to the equipment to be measured moves in test cavity.By using the above technical scheme, the test versatility and comprehensiveness of tool are improved.

Description

Technical Field

[0001] This utility model relates to the technical field of imaging resolution testing equipment, and more specifically, to a photoacoustic ultrasonic imaging resolution testing fixture and imaging resolution testing equipment. Background Technology

[0002] Photoacoustic imaging technology is based on the "photoacoustic effect." It uses a laser of a specific wavelength to irradiate biological tissue or a sample, causing the sample to undergo periodic thermal expansion and radiate ultrasonic signals. These signals are then acquired by an ultrasonic detector and reconstructed by a backend algorithm, ultimately forming an image that combines optical contrast (allowing for differentiation of different tissue components) and ultrasonic penetration depth (suitable for deep tissue observation). Ultrasonic imaging technology, on the other hand, relies on the differences in the propagation speed and reflection characteristics of ultrasound waves in different media. It generates structural images of the target area by emitting and receiving ultrasonic echo signals. Both technologies, with their advantages of no ionizing radiation, real-time imaging, and high cost-effectiveness, have been widely applied in clinical diagnosis (such as early screening for breast tumors, detection of vascular malformations, and fetal development monitoring), basic biomedical research (such as observation of cellular-level microstructures), and some industrial non-destructive testing (such as identifying micro-defects within materials). The imaging quality directly determines the accuracy and reliability of the detection results.

[0003] In the research and development, verification, production calibration, and pre-clinical performance evaluation of photoacoustic and ultrasound imaging systems, "imaging resolution" is a core performance indicator. It is defined as the smallest object size that the imaging system can clearly identify and accurately distinguish; in other words, "the smallest object the system can detect." This indicator directly limits the system's ability to identify minute targets. For example, in clinical settings, insufficient resolution may lead to the omission of crucial information such as early-stage micro-tumor lesions and microvascular abnormalities. Therefore, it is necessary to accurately determine the imaging resolution through standardized testing procedures to ensure that the system performance meets application requirements.

[0004] The current mainstream testing approach for photoacoustic and ultrasonic imaging resolution in the industry is as follows: A "standard reference object" with known precise dimensions is used as the test target. This object is placed within the effective imaging range of the imaging system. After the system collects the target's imaging data, the image size of the target in the image is compared and analyzed with the actual physical size of the reference object (e.g., calculating the deviation rate between the image size and the actual size, judging the sharpness of the target's edges in the image), thereby determining the actual imaging resolution of the imaging system. Tungsten filaments are commonly used as standard reference objects in this type of resolution testing due to their advantages such as high diameter uniformity (allowing for precise diameter control at the micrometer or even sub-micrometer level), stable acoustic impedance and optical absorption characteristics (not prone to characteristic drift in photoacoustic and ultrasonic imaging environments, ensuring test repeatability), and moderate mechanical strength. Specifically, a tungsten filament with a specific standard diameter (such as a series of specifications with a diameter range of 0.5μm-50μm) is selected as the benchmark for measuring the minimum detectable size of the imaging system.

[0005] However, although the technical approach of "using standard diameter tungsten wires as targets to test resolution" has been widely accepted in the industry, the current tooling used to mount the tungsten wires (i.e., tungsten wire fixing and positioning devices) still has significant defects, which limits the accuracy, efficiency, and applicability of resolution testing. The specific problems are as follows: Poor versatility: Different models and application scenarios of photoacoustic and ultrasonic imaging systems have significant differences in effective imaging area size, probe focal length, and sample holder structure. However, existing fixtures are mostly designed with fixed structures, which cannot flexibly adjust the tungsten wire's mounting height, horizontal position, relative angle and distance to the imaging probe according to the parameters of different systems. As a result, a set of fixtures can only be adapted to a single model or a few systems of the same specifications. Custom fixtures need to be designed separately for different systems, which greatly increases the testing cost and operational complexity. In summary, there is an urgent need for a versatile tungsten wire mounting fixture to meet the performance testing requirements in the current process of photoacoustic and ultrasonic imaging resolution testing. Utility Model Content

[0006] The purpose of this invention is to provide a photoacoustic ultrasonic imaging resolution testing fixture and imaging resolution testing equipment to solve the technical problem of poor versatility of photoacoustic ultrasonic imaging resolution testing fixtures in the prior art.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is as follows: Firstly, a photoacoustic ultrasonic imaging resolution testing fixture is provided, comprising: A support plate, a test liquid container disposed on the support plate, a device under test fixing structure disposed on the test liquid container, a test element fixing structure disposed inside the test liquid container, a test element disposed on the test element fixing structure, and a drive assembly disposed on the support plate and connected to the test element fixing structure. The support plate is used to be placed horizontally on the test platform; the test liquid container is provided with a test chamber for containing the test liquid; the device under test fixing structure is used to fix the device under test so that the device under test is located in the test chamber; the test element fixing structure is used to fix the test element and so that the test element is located in the test chamber; the driving assembly is used to drive the test element fixing structure to move relative to the device under test in the test chamber.

[0008] By adopting the above technical solution, the fixture ensures the overall structural stability of the fixture through the horizontal setting of the support plate and the orderly assembly of each component, avoiding the impact of foundation tilt or component loosening on test accuracy. The test chamber of the test liquid container provides a stable liquid environment for testing, ensuring the consistency of photoacoustic and ultrasonic signals during propagation and reducing the interference of signal propagation deviation on imaging results. The device under test (DUT) fixing structure and the test element fixing structure reliably fix the two types of core components, effectively preventing the DUT and test elements from shifting during testing, ensuring the stability of the imaging object's position, and improving the reliability of test results. The drive component enables the movement and adjustment of the test element relative to the DUT, covering different test positions within the test chamber, meeting the needs of different resolution tests of the imaging system, solving the problem of limited testing scenarios in fixed positions, improving the fixture's test versatility and comprehensiveness, and thus ensuring accurate and comprehensive completion of photoacoustic and ultrasonic imaging resolution testing, providing reliable test assurance for the performance evaluation of the imaging system. In one embodiment, the test liquid container has a test opening communicating with the test chamber, the test element fixing structure extends into the test chamber from the test opening, and the device under test fixing structure is mounted on the test opening.

[0009] In one embodiment, the device under test (DUT) fixing structure includes a boom, fixed ends located at both ends of the boom, and a fixing protrusion located between the two fixed ends. The boom end is provided with a sliding groove that slides with the side of the test liquid container, allowing the boom to move relative to the test liquid container. The fixing protrusion is used to fix the DUT.

[0010] In one embodiment, the portion of the boom near the fixed protrusion has a cable channel for accommodating the cable of the device under test.

[0011] In one embodiment, the test element fixing structure includes a fixing plate and two fixing posts spaced apart on the fixing plate, the fixing posts being arranged perpendicular to the fixing plate, and the test element being fixed between the two fixing posts.

[0012] In one embodiment, the fixing plate has a clearance groove for avoiding the device under test, and the fixing posts are located on both sides of the clearance groove.

[0013] In one embodiment, the driving assembly includes a first guide rail disposed on the support plate, a first slider slidably disposed on the first guide rail, a first driving member for driving the first slider to slide on the first guide rail, a second guide rail disposed on the first slider, a second slider slidably disposed on the second guide rail, a second driving member for driving the second slider to slide on the second guide rail, a third guide rail disposed on the second slider, a third slider slidably disposed on the third guide rail, and a third driving member for driving the third slider to slide on the third guide rail; wherein the first guide rail is arranged perpendicular to the second guide rail, the third guide rail is arranged perpendicular to the first guide rail and the second guide rail, and the third slider is connected to the test element fixing structure.

[0014] In one embodiment, the test element is a tungsten wire element.

[0015] In one embodiment, the device under test is a photoacoustic device or an ultrasonic device.

[0016] Secondly, an imaging resolution testing device is provided, comprising an imaging resolution testing device body and the aforementioned photoacoustic ultrasonic imaging resolution testing fixture, wherein the photoacoustic ultrasonic imaging resolution testing fixture is disposed on the imaging resolution testing device body.

[0017] By adopting the above technical solution, the imaging resolution testing equipment of this embodiment has the advantage of good versatility, in addition to the advantages of the photoacoustic ultrasonic imaging resolution testing fixture of the above embodiment. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a three-dimensional structural diagram of the photoacoustic ultrasonic imaging resolution testing fixture provided in this embodiment of the present invention.

[0020] Figure 2 This is an exploded view of the photoacoustic ultrasonic imaging resolution testing fixture provided in this embodiment of the present invention.

[0021] Figure 3 This is a three-dimensional structural diagram of the driving component provided in an embodiment of this utility model.

[0022] The labels for the attached figures are as follows: 1. Support plate; 2. Test liquid container; 3. Device under test mounting structure; 4. Test element mounting structure; 5. Test element; 6. Drive assembly; 7. Device under test; 8. Cable guide rod; 21. Test chamber; 22. Test opening; 31. Lifting arm; 32. Fixed end; 33. Fixed protrusion; 34. Wire channel; 41. Fixing plate; 42. Fixing column; 61. First guide rail; 62. First sliding member; 63. First driving member; 64. Second guide rail; 65. Second sliding member; 66. Second driving member; 67. Third guide rail; 68. Third sliding member; 69. Third driving member; 321. Slide groove; 411. Clearance groove. Detailed Implementation

[0023] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0024] It should be noted that when a component is referred to as "fixed to" or "set on" another component, it can be located directly on or indirectly on the other component. When a component is referred to as "connected to" another component, it can be directly or indirectly connected to the other component.

[0025] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not indicate that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0026] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating relative importance or the number of technical features. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified. The specific implementation of this utility model is described in more detail below with reference to specific embodiments: like Figures 1 to 3 As shown in the figure, an embodiment of the present invention provides a photoacoustic ultrasonic imaging resolution testing fixture, comprising: Support plate 1, test liquid container 2 disposed on support plate 1, test device fixing structure 3 disposed on test liquid container 2, test element fixing structure 4 disposed inside test liquid container 2, test element 5 disposed on test element fixing structure 4, and drive assembly 6 disposed on support plate 1 and connected to test element fixing structure 4. The support plate 1 is used to be placed horizontally on the test platform; the test liquid container 2 is provided with a test chamber 21 for containing the test liquid; the device under test fixing structure 3 is used to fix the device under test 7 so that the device under test 7 is located in the test chamber 21; the test element fixing structure 4 is used to fix the test element 5 and so that the test element 5 is located in the test chamber 21; the drive assembly 6 is used to drive the test element fixing structure 4 to move relative to the device under test 7 in the test chamber 21.

[0027] Specifically, in terms of structural composition, the support plate 1 is the basic load-bearing component. The core function of the support plate 1 is to be placed horizontally on the test platform, providing a stable horizontal support foundation for the entire fixture. The test liquid container 2 is directly mounted on the support plate 1, and its interior has a dedicated test chamber 21 for containing the test liquid. The test liquid is compatible with the signal propagation medium requirements of photoacoustic and ultrasonic imaging. The device under test (DUT) fixing structure 3 is mounted on the test liquid container 2. Its function is to fix the DUT 7 used for resolution testing. This fixing action ensures that the DUT 7 is positioned within the test chamber 21 of the test liquid container 2, guaranteeing that the imaging detection end of the DUT 7 can communicate with the test liquid and the measurement medium within the test chamber 21. The test element 5 functions effectively; the test element fixing structure 4 is set inside the test liquid container 2, mainly used to fix the test element 5, which serves as a reference for resolution testing, and at the same time, its fixing method ensures that the test element 5 is also in the test chamber 21, and can maintain the stable posture of the test element 5 in the test chamber 21; the test element 5 is directly assembled on the test element fixing structure 4, serving as a reference component for measuring imaging resolution; the drive component 6 is also set on the support plate 1 and is connected to the test element fixing structure 4. Its core function is to generate driving force to drive the test element fixing structure 4 (with the test element 5) to move relative to the test device 7 in the test chamber 21, meeting the adjustment requirements of different test positions.

[0028] Its working principle is as follows: When conducting photoacoustic and ultrasonic imaging resolution testing, the support plate 1 is first placed horizontally on the test platform to provide a stable horizontal support foundation for the entire fixture. Then, a suitable test liquid is injected into the test chamber 21 of the test liquid container 2. The device under test 7 is then fixed by the device under test fixing structure 3, so that the device under test 7 enters the test chamber 21 and forms a reasonable relative positional relationship with the test liquid and the test element 5. At the same time, the test element 5 is fixed in the test chamber 21 by the test element fixing structure 4. After all the above components are in the preset initial state, the drive assembly 6 is activated. The drive assembly 6 drives the test element fixing structure 4 (and the test element 5) to move relative to the device under test 7 in the test chamber 21 to adjust the different positions of the test element 5 in the test chamber 21. The device under test 7 then performs photoacoustic and ultrasonic imaging on the test element 5 at different positions. By comparing the obtained imaging results with the actual size of the test element 5, the imaging resolution is tested.

[0029] By adopting the above technical solution, the tooling ensures the overall structural stability of the tooling through the horizontal setting of the support plate 1 and the orderly assembly of each component, avoiding the impact of foundation tilt or component loosening on test accuracy; the test chamber 21 of the test liquid container 2 provides a stable liquid environment for testing, ensuring the consistency of photoacoustic and ultrasonic signals during propagation and reducing the interference of signal propagation deviation on imaging results; the device under test fixing structure 3 and the test element fixing structure 4 reliably fix the two types of core components, effectively preventing the device under test 7 and the test element 5 from shifting during testing, ensuring the stability of the imaging object's position, and improving the reliability of test results; the drive component 6 can realize the movement adjustment of the test element 5 relative to the device under test 7, covering different test positions within the test chamber 21, meeting the needs of different area resolution tests of the imaging system, solving the problem of single fixed-position test scenarios, improving the test versatility and comprehensiveness of the tooling, and thus ensuring that the photoacoustic and ultrasonic imaging resolution test can be completed accurately and comprehensively, providing reliable test assurance for the performance evaluation of the imaging system. In one embodiment, the test liquid container 2 is provided with a test opening 22 that communicates with the test chamber 21, the test element fixing structure 4 extends into the test chamber 21 from the test opening 22, and the device under test fixing structure 3 is mounted on the test opening 22.

[0030] Specifically, in terms of structural composition, the support plate 1, which is horizontally placed on the test platform, serves as the basic load-bearing component. The test liquid container 2 is mounted on the support plate 1. The test liquid container 2 not only has a test chamber 21 for containing the test liquid, but also a test opening 22 communicating with the test chamber 21. The device under test (DUT) fixing structure 3 is mounted on the test liquid container 2 and specifically erected at the test opening 22. Its function is to fix the DUT 7 and, through the design of its mounting position, ensure that the DUT 7 is located in the test chamber 21, ensuring that the imaging detection end of the DUT 7 can form an effective imaging association with the test liquid and the test element 5 in the test chamber 21. The test element is fixed. Structure 4 is installed inside the test liquid container 2, and the test element fixing structure 4 extends from the outside into the test chamber 21 through the test opening 22. Its core function is to fix the test element 5, which serves as the standard reference for resolution testing, and to ensure that the test element 5 is stably placed in the test chamber 21 through the insertion installation and fixing method. The test element 5 is directly assembled on the test element fixing structure 4 and serves as the reference component for measuring imaging resolution. The drive assembly 6 is installed on the support plate 1 and connected to the test element fixing structure 4. It is used to generate driving force to drive the test element fixing structure 4 to move relative to the test device 7 in the test chamber 21 to meet the adjustment requirements of different test positions.

[0031] In one embodiment, the device under test fixing structure 3 includes a boom 31, fixed ends 32 located at both ends of the boom 31, and a fixing protrusion 33 located between the two fixed ends 32. The end of the boom 31 is provided with a sliding groove 321 that slides with the side of the test liquid container 2, so that the boom 31 can move relative to the test liquid container 2. The fixing protrusion 33 is used to fix the device under test 7.

[0032] Specifically, in terms of structural composition, the support plate 1, which is horizontally placed on the test platform, serves as the basic load-bearing component. The test liquid container 2 is mounted on the support plate 1. The test liquid container 2 has a test chamber 21 for containing the test liquid and a test opening 22 communicating with the test chamber 21. The device under test (DUT) fixing structure 3 is mounted on the test liquid container 2 and positioned at the test opening 22. The DUT fixing structure 3 includes a boom 31, fixed ends 32 at both ends of the boom 31, and a fixing protrusion 33 between the two fixed ends 32. The boom 31 has a sliding groove 321 at its end, which slides into the side of the test liquid container 2. This sliding engagement allows the boom 31 to move relative to the test liquid container 2. The fixing protrusion 33 serves to support the device under test for resolution. The device under test (DUT) 7 is fixed in place, and then, through the support of the boom 31 and the fixing action of the fixing protrusion 33, the DUT 7 is positioned in the test chamber 21, ensuring that the imaging detection end of the DUT 7 can effectively cooperate with the test liquid and test element 5 in the test chamber 21. The test element fixing structure 4 is set inside the test liquid container 2 and extends into the test chamber 21 from the test opening 22. It is used to fix the test element 5, which serves as a reference for resolution testing, and to place the test element 5 in the test chamber 21. The test element 5 is assembled on the test element fixing structure 4 and serves as a reference component for measuring imaging resolution. The drive assembly 6 is set on the support plate 1 and connected to the test element fixing structure 4. It is used to generate driving force to move the test element fixing structure 4 and the test element 5 relative to the DUT 7 in the test chamber 21, meeting the adjustment requirements of different test positions.

[0033] In one embodiment, the portion of the boom 31 near the fixed protrusion 33 has a cable tray 34 for accommodating the cable of the device under test 7.

[0034] Specifically, in terms of structural composition, the boom 31 of the device under test fixing structure 3 has a cable passage groove 34 near the fixing protrusion 33. The cable passage groove 34 is a groove-shaped structure on the boom 31, which is specifically used to accommodate the cable of the device under test 7. Combined with the overall structure, the boom 31 slides with the side of the test liquid container 2 through the end slide groove 321. It has fixed ends 32 at both ends and a fixing protrusion 33 in the middle to fix the device under test 7. The cable passage groove 34 allows the boom 31 to support and fix the device under test 7 while storing the cable connected to the device.

[0035] Its working principle is as follows: During the test, when the device under test 7 is fixed to the boom 31 by the fixed protrusion 33, the cable of the device under test 7 (such as the cable used for power supply and signal transmission) can be embedded into the cable tray 34. The cable tray 34 constrains the cable to be arranged in an orderly manner along the boom 31, avoiding the cable from hanging down or being scattered. When the boom 31 moves and adjusts its position relative to the test liquid container 2, the cable in the cable tray 34 moves synchronously with the boom 31 and will not be entangled, pulled or interfered with the test liquid container 2, the test element fixing structure 4 or other components due to the movement of the boom 31.

[0036] By adopting the above technical solution, the cable tray 34 effectively solves the problem caused by messy cables in the device under test 7: First, it avoids the force displacement of the device under test 7 caused by cable entanglement, ensuring the stability of the fixed protrusion 33 in fixing the device and maintaining the accuracy of the imaging detection end position; Second, it prevents interference between cables and moving parts such as the test element fixing structure 4 and the drive component 6, ensuring that the drive component 6 moves the test element 5 without being obstructed by cables, thus improving the smoothness of the testing process; Third, it enables the orderly storage of cables, reduces external interference factors, improves the neatness and ease of operation of the overall fixture structure, and further ensures the stability and reliability of photoacoustic ultrasonic imaging resolution testing.

[0037] In one embodiment, the test element fixing structure 4 includes a fixing plate 41 and two fixing posts 42 spaced apart on the fixing plate 41. The fixing posts 42 are arranged perpendicular to the fixing plate 41, and the test element 5 is fixed between the two fixing posts 42.

[0038] Specifically, in terms of structural composition, the test element fixing structure 4, as the core component for fixing the test element 5 and placing it within the test chamber 21 of the test liquid container 2, includes a fixing plate 41 and two fixing posts 42. The fixing plate 41 is the basic load-bearing structure, with one end connected to the drive assembly 6 located on the support plate 1. The entire structure can move within the test chamber 21 under the drive of the drive assembly 6. The two fixing posts 42 are spaced apart on the side of the fixing plate 41 facing the device under test 7, and the extension direction of the fixing posts 42 is perpendicular to the fixing plate 41, forming a perpendicularity to the fixing plate 41. The surface support structure allows the test element 5 (such as a standard diameter tungsten wire) to be fixed between two fixed posts 42. The two fixed posts 42 provide spaced support to ensure stable positioning of the test element 5 within the test chamber 21. Simultaneously, the connection between the fixed plate 41 and the drive assembly 6 allows the test element 5 to move synchronously with the fixed plate 41. The test element fixing structure 4 is located inside the test liquid container 2 and extends into the test chamber 21 from the test opening 22 of the test liquid container 2 along with the fixed plate 41, forming a corresponding imaging relationship with the device under test 7 on the device under test fixing structure 3.

[0039] Its working principle is as follows: In the test preparation stage, the two ends of the test element 5 (such as a tungsten wire) are fixed to two spaced-apart fixed posts 42. The vertical connection between the fixed posts 42 and the fixed plate 41 ensures that the test element 5 maintains a preset posture that is perpendicular or parallel to the surface of the fixed plate 41 (adapting to the imaging angle requirements of the device under test 7). Simultaneously, the spacing between the two fixed posts 42 ensures that the test element 5 is taut and within the effective imaging area of ​​the test chamber 21. When the drive assembly 6 is activated, it moves the fixed plate 41 connected to it within the test chamber 21. The step moves the two vertically mounted fixed columns 42 and the test element 5 fixed between the two columns. During the process, the two fixed columns 42 always maintain a vertical state and a distance from the fixed plate 41, so that the position of the test element 5 relative to the fixed plate 41 remains unchanged. This enables the test element 5 to move precisely relative to the test device 7 at different positions in the test chamber 21, ensuring that the test device 7 can stably image the test element 5 at different positions. At the same time, the test liquid in the test liquid container 2 fills the fixed plate 41, fixed columns 42 and test element 5, providing a medium for the propagation of photoacoustic and ultrasonic signals.

[0040] By adopting the above technical solution, the test element fixing structure 4, through the combination design of fixing plate 41 and two vertically spaced fixing columns 42, provides a stable bearing base for fixing columns 42, preventing the fixing columns 42 from shaking due to the buoyancy of the test liquid or the movement of the drive component 6, thus ensuring the stability of the test element 5 and solving the problem of easy loosening and displacement of the test element 5 caused by traditional fixing structures. On the other hand, the vertically spaced fixing columns 42 can adapt to test elements 5 of different lengths by adjusting the spacing, improving the versatility of the structure, and also keep the test element 5 taut between the two columns, preventing... The test element 5 may bend or shift position due to slack, ensuring the accuracy of the comparison between the actual size of the test element 5 and the image size during imaging. In addition, the vertical connection between the fixing post 42 and the fixing plate 41 allows the test element 5 to maintain the preset imaging posture. With the help of the drive component 6 to move the fixing plate 41, the test element 5 can be adjusted in multiple dimensions and with high precision within the test cavity 21. This meets the imaging requirements of the device under test 7 for test elements 5 at different depths and angles, further improving the comprehensiveness and reliability of the test results. At the same time, the overall structure is simple, and the assembly and replacement of the test element 5 are convenient, reducing the complexity of the test operation.

[0041] In one embodiment, the fixing plate 41 has a clearance groove 411 for avoiding the device under test 7, and the fixing post 42 is located on both sides of the clearance groove 411.

[0042] Specifically, from a structural perspective, the fixing plate 41 of the test element fixing structure 4 is provided with an avoidance groove 411. The avoidance groove 411 is a groove-shaped structure formed by a recess on the surface of the fixing plate 41. Its groove size and position are adapted to the shape and installation position of the device under test 7, so as to avoid the device under test 7 in space and avoid structural interference between the fixing plate 41 and the device under test 7. At the same time, two spaced fixing posts 42 perpendicular to the fixing plate 41 are located on both sides of the avoidance groove 411, that is, the avoidance groove 411 is located in the area between the two fixing posts 42. The fixing posts 42 still maintain a vertical connection with the fixing plate 41. When the test element 5 (such as a standard tungsten wire) is fixed across the two fixing posts 42, it will cross the top or side of the avoidance groove 411, so that the test element 5 and the avoidance groove 411 form a staggered layout. The fixing plate 41 as a whole is still connected to the driving assembly 6, and can move synchronously with the test element fixing structure 4 in the test chamber 21 of the test liquid container 2 under the drive of the driving assembly 6.

[0043] Its working principle is as follows: During the test preparation stage, after the device under test (DUT) 7 is fixed by the DUT fixing structure 3 and extended into the test chamber 21, the part of the DUT 7 extending into the test chamber 21 will correspond to the position of the clearance groove 411 of the fixing plate 41. Through the spatial clearance effect of the clearance groove 411, when the fixing plate 41 approaches or moves to the vicinity of the DUT 7 under the drive component 6, it will not collide or contact with the DUT 7, ensuring that the movement path of the fixing plate 41 is not obstructed by the DUT 7; at the same time, the fixing posts 42 located on both sides of the clearance groove 411 are fixed The test elements 5 are distributed around the part of the device under test 7 that extends into the test cavity 21. When the drive assembly 6 moves the fixing plate 41, the clearance groove 411 always corresponds to the part of the device under test 7 that extends into it, avoiding interference while allowing the test elements 5 to move with the fixing plate 41 at different positions and depths of the device under test 7. The device under test 7 can perform a full imaging of the test elements 5 on the fixing posts 42 on both sides of the clearance groove 411, and the test liquid in the test cavity 21 can flow through the clearance groove 411 without affecting the propagation of photoacoustic and ultrasonic signals.

[0044] By adopting the above technical solution, the setting of the clearance groove 411 on the fixing plate 41 and the layout of the fixing posts 42 on both sides of the groove firstly solves the spatial interference problem between the traditional test element fixing structure 4 and the device under test 7 in the test cavity 21, and breaks the limitation of the movement range of the fixing plate 41 being limited by the position of the device under test 7. This allows the fixing plate 41 to move the test element 5 closer to the imaging detection end of the device under test 7, or to achieve multi-dimensional movement around the device under test 7, thus expanding the test position range of the test element 5. Secondly, the fixing posts 42 are located on both sides of the clearance groove 411, allowing the test element 5 to be distributed around the extension part of the device under test 7. The device under test 7 can then inspect the imaging of the test element 5 in different directions. The test allows for a more comprehensive evaluation of the imaging system's resolution performance at different angles, improving the completeness of the test results. Furthermore, the opening of the clearance groove 411 does not damage the overall structural strength of the fixing plate 41, nor does it affect the fixing stability of the fixing column 42 on the test element 5, ensuring that the test element 5 always maintains tension and preset posture during movement, guaranteeing the accuracy of the comparison between the imaging size and the actual size. At the same time, the improved flowability of the test liquid through the clearance groove 411 further reduces the non-uniformity of signal propagation and enhances the reliability of the test results. The overall structural design is ingenious, achieving a reasonable layout of the device under test 7 and the test element 5 within the limited space of the test cavity 21, improving the practicality and comprehensiveness of the tooling.

[0045] In one embodiment, the drive assembly 6 includes a first guide rail 61 disposed on the support plate 1, a first slider 62 slidably disposed on the first guide rail 61, a first drive member 63 for driving the first slider 62 to slide on the first guide rail 61, a second guide rail 64 disposed on the first slider 62, a second slider 65 slidably disposed on the second guide rail 64, a second drive member 66 for driving the second slider 65 to slide on the second guide rail 64, a third guide rail 67 disposed on the second slider 65, a third slider 68 slidably disposed on the third guide rail 67, and a third drive member 69 for driving the third slider 68 to slide on the third guide rail 67; wherein the first guide rail 61 is disposed perpendicular to the second guide rail 64, the third guide rail 67 is disposed perpendicular to the first guide rail 61 and the second guide rail 64, and the third slider 68 is connected to the test element fixing structure 4.

[0046] Specifically, from a structural perspective, the drive assembly 6, as the core power component that drives the test element fixing structure 4 to move relative to the test device 7 within the test chamber 21, includes a first guide rail 61, a first sliding member 62, a first drive member 63, a second guide rail 64, a second sliding member 65, a second drive member 66, a third guide rail 67, a third sliding member 68, and a third drive member 69. The first guide rail 61 is directly mounted on the support plate 1, providing a basic mounting and guiding reference for the drive assembly 6. The first sliding member 62 is slidably mounted on the first guide rail 61 and can slide linearly along the extension direction of the first guide rail 61. The first drive member 63 is connected to the first sliding member 62 and outputs driving force to drive the first sliding member 62 to slide along the first guide rail 61. The second guide rail 64 is mounted on the first sliding member 62 and moves synchronously with the sliding of the first sliding member 62. The first guide rail 61 and the second guide rail 64 are perpendicularly distributed, making the extension direction of the second guide rail 64 completely different from that of the first guide rail 61. Two sliding members 65 are slidably disposed on the second guide rail 64 and can slide linearly along the extension direction of the second guide rail 64; the second driving member 66 is connected to the second sliding member 65 and is used to output driving force to drive the second sliding member 65 to slide along the second guide rail 64; the third guide rail 67 is disposed on the second sliding member 65 and moves synchronously with the sliding of the second sliding member 65, and the third guide rail 67 is perpendicular to the first guide rail 61 and the second guide rail 64, forming an extension direction different from the former two, and the three together constitute a three-dimensional guiding structure; the third sliding member 68 is slidably disposed on the third guide rail 67 and can slide linearly along the extension direction of the third guide rail 67; the third driving member 69 is connected to the third sliding member 68 and is used to output driving force to drive the third sliding member 68 to slide along the third guide rail 67; at the same time, the third sliding member 68 is directly connected to the test element fixing structure 4 (specifically the fixing plate 41 of the test element fixing structure 4), so that the sliding of the third sliding member 68 can drive the test element fixing structure 4 and the test element 5 to move synchronously.

[0047] In one embodiment, test element 5 is a tungsten wire element.

[0048] Specifically, in terms of structural composition, the test element 5 adopts a tungsten wire element, which serves as a standard reference for resolution testing. Its structure is a filament with a fixed and precise diameter. Both ends of the tungsten wire element are fixed between two spaced-apart fixed posts 42 of the test element fixing structure 4. The tungsten wire element is tensioned and fixed in the test chamber 21 of the test liquid container 2 through the support of the fixed posts 42. At the same time, the tungsten wire element is completely immersed in the test liquid in the test chamber 21, forming a corresponding imaging relationship with the imaging detection end of the device under test 7 (photoacoustic and ultrasonic imaging device) on the device under test fixing structure 3. Its length is adapted to the spacing between the two fixed posts 42, ensuring that it is completely within the effective imaging field of view of the device under test 7.

[0049] In one embodiment, the device under test 7 is a photoacoustic device or an ultrasonic device.

[0050] Specifically, in terms of structural composition, the device under test 7 is either a photoacoustic device or an ultrasonic device. Both types of devices are installed in conjunction with the tooling through the device under test fixing structure 3. The boom 31 of the device under test fixing structure 3 slides against the side of the test liquid container 2 through the end groove 321. The position of the boom 31 can be adjusted according to the external dimensions and detection end specifications of the photoacoustic or ultrasonic device. The device body is then securely clamped by the fixing protrusion 33 in the middle of the boom 31. At the same time, the cable tray 34 near the fixing plate 41 of the boom 31 accommodates the power supply and signal transmission cables of the device, ensuring the secure mounting of both types of devices. Once fixed, the probe ends can all be inserted into the test chamber 21 of the test liquid container 2, and the axis of the probe end forms a preset angle (such as perpendicular or parallel) with the tungsten wire element on the test element fixing structure 4 (fixed between two vertically spaced fixing columns 42), adapting to the different detection direction requirements of photoacoustic equipment and ultrasonic equipment; in addition, the test liquid (such as water) filled in the test chamber 21 of the test liquid container 2 can meet the photoacoustic signal propagation medium requirements for imaging of photoacoustic equipment, and can also adapt to the ultrasonic wave propagation medium requirements of ultrasonic equipment, ensuring that both types of equipment can achieve effective imaging in the test chamber 21.

[0051] In one embodiment, the support plate 1 is also provided with a cable guide rod 8. The cable guide rod 8 is a cylindrical component that is fixed to the support plate 1 by its own threads. The material is aluminum alloy. It can fix the cable of the device under test 7 so that the cable will not be pulled and damaged.

[0052] Secondly, an imaging resolution testing device is provided, including an imaging resolution testing device body and the aforementioned photoacoustic ultrasonic imaging resolution testing fixture, wherein the photoacoustic ultrasonic imaging resolution testing fixture is disposed on the imaging resolution testing device body.

[0053] By adopting the above technical solution, the imaging resolution testing equipment of this embodiment has the advantage of good versatility, in addition to the advantages of the photoacoustic ultrasonic imaging resolution testing fixture of the above embodiment.

[0054] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A photoacoustic ultrasonic imaging resolution testing fixture, characterized in that, include: A support plate, a test liquid container disposed on the support plate, a device under test fixing structure disposed on the test liquid container, a test element fixing structure disposed inside the test liquid container, a test element disposed on the test element fixing structure, and a drive assembly disposed on the support plate and connected to the test element fixing structure. The support plate is used to be placed horizontally on the test platform; the test liquid container is provided with a test chamber for containing the test liquid; the device under test fixing structure is used to fix the device under test so that the device under test is located in the test chamber; the test element fixing structure is used to fix the test element and so that the test element is located in the test chamber; the driving assembly is used to drive the test element fixing structure to move relative to the device under test in the test chamber.

2. The photoacoustic ultrasonic imaging resolution testing fixture as described in claim 1, characterized in that, The test liquid container is provided with a test opening that communicates with the test chamber. The test element fixing structure extends into the test chamber from the test opening, and the device under test fixing structure is mounted on the test opening.

3. The photoacoustic ultrasonic imaging resolution testing fixture as described in claim 2, characterized in that, The device under test fixing structure includes a boom, fixed ends located at both ends of the boom, and a fixing protrusion located between the two fixed ends. The boom end is provided with a sliding groove that slides with the side of the test liquid container, so that the boom can move relative to the test liquid container. The fixing protrusion is used to fix the device under test.

4. The photoacoustic ultrasonic imaging resolution testing fixture as described in claim 3, characterized in that, The portion of the boom near the fixed protrusion has a cable channel for accommodating the cable of the device under test.

5. The photoacoustic ultrasonic imaging resolution testing fixture as described in any one of claims 1 to 4, characterized in that, The test element fixing structure includes a fixing plate and two fixing posts spaced apart on the fixing plate. The fixing posts are arranged perpendicular to the fixing plate, and the test element is fixed between the two fixing posts.

6. The photoacoustic ultrasonic imaging resolution testing fixture as described in claim 5, characterized in that, The fixing plate has a clearance groove for avoiding the device under test, and the fixing posts are located on both sides of the clearance groove.

7. The photoacoustic ultrasonic imaging resolution testing fixture as described in any one of claims 1 to 4, characterized in that, The driving assembly includes a first guide rail disposed on the support plate, a first slider slidably disposed on the first guide rail, a first driving member for driving the first slider to slide on the first guide rail, a second guide rail disposed on the first slider, a second slider slidably disposed on the second guide rail, a second driving member for driving the second slider to slide on the second guide rail, a third guide rail disposed on the second slider, a third slider slidably disposed on the third guide rail, and a third driving member for driving the third slider to slide on the third guide rail; wherein, the first guide rail is arranged perpendicular to the second guide rail, the third guide rail is arranged perpendicular to the first guide rail and the second guide rail, and the third slider is connected to the test element fixing structure.

8. The photoacoustic ultrasonic imaging resolution testing fixture as described in any one of claims 1 to 4, characterized in that, The test element is a tungsten wire element.

9. The photoacoustic ultrasonic imaging resolution testing fixture as described in any one of claims 1 to 4, characterized in that, The device under test is a photoacoustic device or an ultrasonic device.

10. An imaging resolution testing device, characterized in that, The device includes a main body for imaging resolution testing and a photoacoustic ultrasonic imaging resolution testing fixture as described in any one of claims 1 to 9, wherein the photoacoustic ultrasonic imaging resolution testing fixture is disposed on the main body of the imaging resolution testing device.

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