Resolution performance detection die body for detecting medical intraoral X-ray imaging system

Abstract

The utility model relates to the technical field of medical intraoral X-ray imaging, discloses a resolution performance detection die body for detection of a medical intraoral X-ray imaging system, and effectively solves the problems that the detection range of a high-contrast resolution module cannot meet the actual detection requirement, the spatial resolution of most medical intraoral X-ray imaging systems exceeds 3.0 lp / mm, and the detection precision is poor. The resolution performance detection die body cannot meet the normal detection requirement when the oral cavity of the patient is detected due to the fact that the resolution performance detection die body can not meet the normal detection requirement when the oral cavity of the patient is detected; according to the utility model, the PMMA protective shell provides a stable protection and accurate positioning basis for the internal components, the tight connection between the PMMA protective shell and the PMMA sealing cover ensures the stability of the internal environment and ensures the detection accuracy, and the resolution test module cooperates with the silicon rubber plate and the spatial resolution plug-in by virtue of a unique decreasing ring and an arc-shaped auxiliary groove structure which can be flexibly configured, so that the reliability of the device is improved. The detection range is greatly widened, and the recognition capability of the imaging system on spatial resolutions with different precisions is accurately detected.

Description

TECHNICAL FIELD

[0001] The utility model relates to medical in -mouth X -ray imaging technical field, concretely is medical in -mouth X -ray imaging system detection uses resolution performance detection mould. BACKGROUND

[0002] Medical in -mouth X -ray imaging is a kind of diagnostic technique widely used in the field of stomatology, it is by placing X -ray source in the external oral cavity, and the image of the internal structure of oral cavity is formed after the ray penetrates the internal tissue of oral cavity and is received by detector, to ensure that medical in -mouth X -ray imaging system can accurately present the internal structure of oral cavity, it needs to accurately detect its imaging performance, and resolution is one of the key indicators to measure imaging quality, and resolution performance detection mould emerges as the times require, it is a tool specially used to evaluate the resolution of medical in -mouth X -ray imaging system, the mould is usually made of specific material, and different sizes and contrast structures are designed inside, for example different pitch line group, different diameter hole etc., by placing detection mould in X -ray imaging system for imaging, and observing and analyzing the clarity of mould structure in imaging result, the spatial resolution and low contrast resolution of the imaging system can be judged Performance parameters, and then ensure that medical in -mouth X -ray imaging system can provide reliable image basis for the diagnosis of oral diseases.

[0003] In use, resolution test card or test mould is placed close to the outlet position of limiting beam cylinder, and its plane is perpendicular to the main beam center axis, the mould is irradiated by beam, and then the resolution performance of imaging system is evaluated by analyzing imaging result.

[0004] But the detection range of the existing high-contrast resolution module cannot meet the actual detection requirements, and the spatial resolution of most medical in -mouth X -ray imaging systems exceeds 3.0lp / mm, even reaches 8lp / mm, so that the resolution performance detection mould cannot meet the normal detection requirements when detecting the oral cavity of patient.

[0005] Therefore, a resolution performance detection mould with high-contrast resolution module detection range meeting the actual detection requirements is needed to solve the above problems. UTILITY MODEL CONTENTS

[0006] In view of the above, in order to overcome the defects of the prior art, the utility model provides medical intraoral X ray imaging system detects resolution performance detection model body, through PMMA protection shell provides stable protection and accurate positioning basis for internal components, its and PMMA seal cover's close connection ensures internal environment stability, guarantees detection accuracy, resolution test module relies on the unique decrement ring and the flexible configuration arc auxiliary groove structure, cooperates with the silicone rubber board and the spatial resolution insert, greatly widens the detection range, accurately detects the identification ability of imaging system to different accuracy spatial resolution, effectively adjusts the ray intensity and distribution, creates a real and reliable environment for resolution detection.

[0007] Medical intraoral X ray imaging system detects resolution performance detection model body, including PMMA protection shell, the inside of PMMA protection shell is provided with bottom base plate, the bottom surface of PMMA protection shell is rotatably connected with PMMA seal cover, the upper surface of PMMA seal cover is in contact with the bottom surface of bottom base plate, the inner wall of PMMA protection shell and the inner wall of PMMA seal cover are commonly connected with two first fixed bolts, the left side of PMMA protection shell is provided with two groups of installation grooves and clamping interfaces respectively, the front of bottom base plate is provided with a socket, the inside of PMMA protection shell is provided with resolution test module, aluminum absorber, low contrast resolution test module and spatial resolution test card respectively, the left side of spatial resolution test card is fixedly connected with positioning plate, the outer surface of positioning plate is clamped with the inside of PMMA protection shell, the inside of clamping interface is clamped with clamping plate, the inner wall of clamping plate and the inner wall of PMMA protection shell are commonly connected with four second fixed bolts, the inside of each installation groove is slidably connected with two installation plates, the outer surface of resolution test module and the outer surface of low contrast resolution test module are fixedly connected with the side of two groups of installation plates that are close to each other respectively, the inside of PMMA protection shell is provided with positioning stable unit.

[0008] Preferably, the positioning stable unit includes four positioning blocks, the left side of each positioning block is fixedly connected with the right side of the spatial resolution test card, the outer surface of each positioning block is provided with two arc-shaped clamping grooves, the inner wall of each arc-shaped clamping groove is provided with an arc-shaped positioning groove, the inner side wall of the PMMA protection shell is provided with a limiting groove, the inside of the limiting groove is clamped with the outer surface of the spatial resolution test card, the inner wall of the limiting groove is provided with four self-locking grooves, the inner wall of each self-locking groove is fixedly connected with two buffer springs, one end of each buffer spring is fixedly connected with a positioning ball, the outer surface of each positioning ball is clamped with the inside of the arc-shaped clamping groove and the inside of the arc-shaped positioning groove.

[0009] Preferably, the positioning and stabilizing unit further comprises two movable plates, the inner wall of the PMMA protective shell is provided with two pressure grooves, the inner part of each pressure groove is fixedly connected with three reset springs, one end of each three reset springs is fixedly connected with the outer surface of the movable plate, the outer surface of each movable plate is fixedly connected with a spherical block, and the outer surface of each spherical block is fixedly connected with a matching plate.

[0010] Preferably, the upper surface of the resolution test module is provided with a decreasing ring, the outer surface of the resolution test module is provided with four arc-shaped auxiliary grooves, the inner part of each arc-shaped auxiliary groove is slidably connected with a silica rubber plate, the outer surface of each silica rubber plate is fixedly connected with four soft PVC strips and an outer protective plate, one end of each soft PVC strip is fixedly connected with the outer surface of the outer protective plate, the inner wall of each silica rubber plate is fixedly connected with a plurality of same spatial resolution inserts, and the upper surface of the low-contrast resolution test module is provided with four drillings of different sizes.

[0011] Preferably, the upper surface of the spatial resolution test card is provided with a low-contrast resolution module and a high-contrast resolution module, the outer surface of the positioning plate is fixedly connected with a sealing gasket, the outer surface of the sealing gasket is in contact with the inner wall of the PMMA protective shell and the bottom surface of the clamping plate respectively, and the inner wall of the positioning plate is fixedly connected with a hidden auxiliary handle.

[0012] Preferably, the upper surface and the bottom surface of the aluminum absorber are provided with two stabilizing grooves and four positioning holes respectively, the bottom surface of the resolution test module is fixedly connected with two stabilizing plates, the outer surface of each stabilizing plate is slidably connected with the inner part of the stabilizing groove, the upper surface of each low-contrast resolution test module is fixedly connected with a positioning column, and the outer surface of each positioning column is in clamping connection with the inner part of the positioning hole.

[0013] The above technical scheme has the following beneficial effects:

[0014] (1) In the scheme, the PMMA protective shell provides stable protection and accurate positioning basis for the internal components, the close connection with the PMMA sealing cover ensures the stability of the internal environment and guarantees the detection accuracy, the resolution test module cooperates with the silica rubber plate and the spatial resolution inserts by virtue of the unique decreasing ring and the flexibly configured arc-shaped auxiliary groove structure, which greatly widens the detection range and accurately detects the recognition ability of the imaging system to different precision spatial resolutions, and the aluminum absorber cooperates with the stabilizing plate of the resolution test module and the positioning column of the low-contrast resolution test module by virtue of the specially designed stabilizing grooves and positioning holes, which accurately simulates the absorption characteristics of human tissues to X-rays, effectively adjusts the intensity and distribution of the rays, and creates a real and reliable environment for the resolution detection.

[0015] (2) In the scheme, through the base substrate as the basis, PMMA protective shell front socket matching positioning plate, guarantee space resolution test card smoothly installation, ensure the overall structure is stable, can clearly and accurately detect the resolution of medical intraoral X-ray imaging system parameter, avoid the detection error caused by the limitation of the test body, provide solid and accurate data support for the performance evaluation of oral medical imaging equipment, greatly improve the reliability and accuracy of oral disease diagnosis, effectively detect the oral patient. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is the whole structure schematic diagram of the utility model;

[0017] Figure 2 It is the structure schematic diagram of PMMA protective shell side view of the utility model;

[0018] Figure 3 It is the structure schematic diagram of PMMA protective shell of the utility model;

[0019] Figure 4 It is the structure schematic diagram of the utility model drilling structure;

[0020] Figure 5 It is the structure schematic diagram of the utility model aluminum absorption body section;

[0021] Figure 6 It is the structure schematic diagram of the utility model resolution test module section;

[0022] Figure 7 It is the structure schematic diagram of the utility model space resolution test card;

[0023] Figure 8 It is the structure schematic diagram of the utility model installation groove;

[0024] Figure 9 It is the structure schematic diagram of the utility model self-locking groove detail enlargement;

[0025] Figure 10 It is the structure schematic diagram of the utility model spherical block;

[0026] Figure 11 It is the structure schematic diagram of the utility model arc-shaped positioning groove.

[0027] In the figure: 1, PMMA protective shell; 2, clamping plate; 3, second fixing bolt; 4, positioning plate; 5, hidden auxiliary handle; 6, movable plate; 7, PMMA sealing cover; 8, spherical block; 9, resolution test module; 10, aluminum absorber; 11, clamping port; 12, spatial resolution test card; 13, low contrast resolution test module; 14, socket; 15, mounting plate; 16, decrement ring; 17, silicone rubber plate; 18, bottom substrate; 19, first fixing bolt; 20, return spring; 21, drill hole; 22, positioning column; 23, positioning hole; 24, stabilizing groove; 25, stabilizing plate; 26, outer protective plate; 27, spatial resolution plug-in; 28, soft PVC strip; 29, arc-shaped auxiliary groove; 30, sealing gasket; 31, low contrast resolution module; 32, arc-shaped positioning groove; 33, high contrast resolution module; 34, positioning block; 35, mounting groove; 36, pressure groove; 37, limiting groove; 38, buffer spring; 39, positioning ball; 40, self-locking groove; 41, fitting plate; 42, arc-shaped clamping groove. DETAILED DESCRIPTION

[0028] The foregoing and other technical contents, features and effects of the present application will be further illustrated in the following description with reference to the accompanying drawings. Figures 1 to 11 In the detailed description of the embodiments, the structural contents mentioned in the following embodiments can be clearly presented with reference to the drawings.

[0029] Embodiment 1 provides a resolution performance detection model for detecting a medical intraoral X-ray imaging system, which comprises a PMMA protective shell 1, a clamping plate 2, a second fixing bolt 3, a positioning plate 4, a hidden auxiliary handle 5, a movable plate 6, a PMMA sealing cover 7, a spherical block 8, a resolution test module 9, an aluminum absorber 10, a clamping port 11, a spatial resolution test card 12, a low contrast resolution test module 13, a socket 14, a mounting plate 15, a decrement ring 16, a silicone rubber plate 17, a bottom substrate 18, a first fixing bolt 19, a return spring 20, a drill hole 21, a positioning column 22, a positioning hole 23, a stabilizing groove 24, a stabilizing plate 25, an outer protective plate 26, a spatial resolution plug-in 27, a soft PVC strip 28, an arc-shaped auxiliary groove 29, a sealing gasket 30, a low contrast resolution module 31, an arc-shaped positioning groove 32, a high contrast resolution module 33, a positioning block 34, a mounting groove 35, a pressure groove 36, a limiting groove 37, a buffer spring 38, a positioning ball 39, a self-locking groove 40, a fitting plate 41 and an arc-shaped clamping groove 42. Figure 1 , Figure 2 and Figure 3As shown, including PMMA protective shell 1, the inside of PMMA protective shell 1 is provided with bottom substrate 18, the bottom surface of PMMA protective shell 1 is rotatably connected with PMMA sealing cover 7, the upper surface of PMMA sealing cover 7 is in contact with the bottom surface of bottom substrate 18, the inner wall of PMMA protective shell 1 and the inner wall of PMMA sealing cover 7 are commonly screwed with two first fixing bolts 19, the left side surface of PMMA protective shell 1 is respectively provided with two groups of mounting grooves 35 and clamping interfaces 11, the front surface of bottom substrate 18 is provided with a socket 14, the inside of PMMA protective shell 1 is respectively provided with resolution test module 9, aluminum absorber 10, low contrast resolution test module 13 and spatial resolution test card 12, the test range of resolution test module 9 is 1.6-3LP / mm expanded to 16-30LP / cm, 4-8LP / mm expanded to 40-80LP / cm, the measurement range of spatial resolution module is 1.6lp / mm, 2.0lp / mm, 2.5lp / mm, 2.8lp / mm, 3.0lp / mm, 4.0lp / mm, 5.0lp / mm, 6.0lp / mm, 7.0lp / mm, 8.0lp / mm, low contrast resolution test module 13: 0.5mm aluminum plate and provided with four drillings 21 with different diameters, the thicknesses are 0.5mm, the diameters are 1mm, 1.5mm, 2mm and 2.5mm, the left side surface of spatial resolution test card 12 is fixedly connected with positioning plate 4, the outer surface of positioning plate 4 is clamped with the inside of PMMA protective shell 1, the inside of clamping interface 11 is clamped with clamping plate 2, the inner wall of clamping plate 2 is commonly screwed with four second fixing bolts 3 with the inner wall of PMMA protective shell 1, the inside of each group of mounting grooves 35 is slidably connected with two mounting plates 15, the outer surfaces of resolution test module 9 and low contrast resolution test module 13 are respectively fixedly connected with the mutually close side surfaces of two groups of mounting plates 15, the inside of PMMA protective shell 1 is provided with positioning and stabilizing unit;

[0030] In the use of resolution performance detection model, the PMMA protective shell 1 as a whole external protection structure, for the internal bottom substrate 18, resolution test module 9, aluminum absorber 10, low contrast resolution test module 13 and spatial resolution test card 12 and other components provide stable accommodation space and protection barrier, isolated from the outside interference factors, maintain the stability of the internal detection environment, its bottom surface and PMMA sealing cover 7 rotating connection, through two first fixed bolt 19 to realize the close fixed, ensure that the internal structure in the detection process from external influence, guarantee the accuracy and reliability of detection, PMMA protective shell 1 side opening can make spatial resolution test card 12 can accurately enter and leave the detection position, convenient according to the detection needs of flexible replacement or adjustment of spatial resolution test card 12, with positioning plate 4, on the one hand, the front of PMMA protective shell 1 is sealed, on the other hand, ensure the position accuracy of test card in detection, so as to ensure the validity and repeatability of detection data, resolution test module 9 is used for accurate test imaging system to recognize the ability of different precision spatial resolution, under the X-ray irradiation, according to the imaging result analysis imaging system to high contrast object detail resolution level, aluminum absorber 10 uses its own physical characteristics, simulate the absorption and scattering of X-ray by human tissue, through with resolution test module 9 and low contrast resolution test module 13, accurate adjustment of X-ray intensity distribution in the model, so that the detection environment is more close to the real human oral tissue imaging environment, ensure that the detection result can truly reflect the resolution performance of imaging system in the actual application scene, improve the practicability and accuracy of detection, low contrast resolution test module 13 after X-ray penetration, through imaging analysis imaging system to low contrast object simulation oral cavity in soft tissue and other resolution ability, synergistic effect with other components, comprehensive evaluation of imaging system in different contrast conditions of resolution performance, for the comprehensive resolution detection of system provides indispensable data dimension, spatial resolution test card 12 can be imaged under X-ray irradiation, further assist in evaluating the spatial resolution of imaging system, improve the detection model of imaging system resolution performance multidimensional detection ability, the sliding connection design of installation groove 35 and mounting plate 15, facilitate the resolution test module 9 and low contrast resolution test module 13 disassembly and maintenance, guarantee the long-term stable use and performance optimization of model, adapt to different detection scene and equipment update demand, card interface 11 and card interface plate 2 and second fixed bolt 3 combination, for the installation of resolution test module 9 and low contrast resolution test module 13 provides additional fixed point and support structure, enhance the connection stability of module in PMMA protective shell 1, prevent displacement or loose caused by vibration or other external factors during detection, ensure the relative position accuracy of each component in the detection process, maintain the stability of the detection environment and the accuracy of the detection result.

[0031] In example 2, on the basis of example 1, the improvement of this example is that, asFigure 7 、 Figure 9 and Figure 11 As shown in FIGS. 1-4, the positioning and stabilizing unit comprises four positioning blocks 34, each of which is fixedly connected to the right side of the spatial resolution test card 12, each of which is provided with two arc-shaped clamping grooves 42 on the outer surface, each of which is provided with an arc-shaped positioning groove 32 on the inner wall, the inner side wall of the PMMA protective shell 1 is provided with a limiting groove 37, the inner surface of which is clamped with the outer surface of the spatial resolution test card 12, the inner wall of the limiting groove 37 is provided with four self-locking grooves 40, each of which is fixedly connected with two buffer springs 38, one end of each buffer spring 38 is fixedly connected with a positioning ball 39, and the outer surface of each positioning ball 39 is clamped with the inner surface of the arc-shaped clamping groove 42 and the inner surface of the arc-shaped positioning groove 32.

[0032] When the resolution performance detection model is used, when the detection model is working, in the process of inserting the spatial resolution test card 12 into the PMMA protective shell 1, the four positioning blocks 34 on the right side slide along the limiting groove 37 of the inner side wall of the PMMA protective shell 1 until they enter the predetermined position, at which time the two arc-shaped clamping grooves 42 on the outer surface of the positioning block 34 and the arc-shaped positioning groove 32 in the groove are aligned with the positioning ball 39 in the self-locking groove 40 on the inner wall of the limiting groove 37. Under the elastic force of the buffer spring 38, the positioning ball 39 is ejected outward and embedded in the arc-shaped clamping groove 42 and the arc-shaped positioning groove 32, realizing precise positioning and stable clamping. On the one hand, the cooperation of the arc-shaped clamping groove 42 and the positioning ball 39 restricts the movement of the positioning block 34 in the horizontal direction, preventing the test card from shifting left and right. On the other hand, the nesting of the arc-shaped positioning groove 32 and the positioning ball 39 further enhances the positioning accuracy in the vertical direction, eliminating the up-and-down movement of the test card and ensuring that the spatial resolution test card 12 is always in the accurate detection position during the detection process, ensuring the accuracy and stability of X-ray imaging analysis. Even if it is subjected to a certain degree of vibration or external interference during the detection process, the positioning and stabilizing structure can rely on the elastic buffer of the buffer spring 38 and the close clamping relationship between the positioning ball 39 and the arc-shaped clamping groove 42 and the arc-shaped positioning groove 32 to maintain the stable state of the test card and ensure the reliability and consistency of the detection results.

[0033] In example 3, on the basis of example 2, the improvement of this example is that, as shown in FIGS. 5-8, Figure 1 、 Figure 2 、 Figure 3 、 Figure 8 and Figure 10As shown, the positioning and stabilizing unit further comprises two movable plates 6, the inner wall of the PMMA protective shell 1 is provided with two pressure grooves 36, the inside of each pressure groove 36 is fixedly connected with three reset springs 20, one end of each three reset springs 20 is fixedly connected with the outer surface of the movable plate 6, the outer surface of each movable plate 6 is fixedly connected with a spherical block 8, and the outer surface of each spherical block 8 is fixedly connected with a matching plate 41;

[0034] When the dose meter probe is inserted into the reserved port of the base plate 18, the movable plate 6 is touched, the movable plate 6 is compressed along the pressure groove 36 to compress the reset spring 20, the spherical block 8 and the matching plate 41 are synchronously moved, after the probe is completely inserted, the reset spring 20 restores the elastic force generated by the deformation to push the movable plate 6 to reset outward, so that the spherical block 8 and the matching plate 41 are tightly matched on the side surface of the probe, the probe is laterally given auxiliary support and buffering, the position of the probe is effectively stabilized and the position deviation or shaking caused by external vibration or other factors is reduced, the dose meter probe can accurately collect data in the detection process, and other structures of the mold body are cooperated to provide accurate and reliable basic conditions for related performance detection of the medical intraoral X-ray imaging system.

[0035] In embodiment 4, on the basis of embodiment 3, the improvement of the embodiment is that, as shown in Figure 2 、 Figure 4 and Figure 6 As shown, the upper surface of the resolution test module 9 is provided with a decreasing ring 16, the outer surface of the resolution test module 9 is provided with four arc-shaped auxiliary grooves 29, the inside of each arc-shaped auxiliary groove 29 is slidably connected with a silica rubber plate 17, the outer surface of each silica rubber plate 17 is fixedly connected with four soft PVC strips 28 and an outer protective plate 26, one end of each soft PVC strip 28 is fixedly connected with the outer surface of the outer protective plate 26, and the inner wall of each silica rubber plate 17 is fixedly connected with a plurality of same spatial resolution inserts 27, the upper surface of the low-contrast resolution test module 13 is provided with four different size drill holes 21.

[0036] When the resolution performance detection model is used, the decreasing rings 16 on the surface of the resolution test module 9 are designed according to a specific size decreasing rule. When the X-rays penetrate, the imaging system images different ring diameter areas. By analyzing the definition and recognition of each ring in the imaging, the detection ability of the system to different precision spatial resolution is accurately evaluated. The resolution is tested from high to low, and various resolution levels are comprehensively covered. The arc-shaped auxiliary groove 29 provides a flexible sliding track for the silicone rubber plate 17. The silicone rubber plate 17 can adjust the position according to the detection requirements due to its good flexibility. The spatial resolution plug-in 27 carried by the silicone rubber plate 17 contains various fine structures, which can simulate complex detection samples and enrich the detection scene. The soft PVC strip 28 and the outer protective plate 26 can reduce the surface friction of the silicone rubber plate 17, facilitate the sliding of the silicone rubber plate 17 in the arc-shaped auxiliary groove 29, and increase the detection effect. The soft PVC strip 28 and the outer protective plate 26 protect the plug-in while optimizing the surrounding physical environment. The four different size drill holes 21 of the low contrast resolution test module 13 simulate the low contrast tissue differences in the oral cavity. After the X-rays penetrate, the resolution of the drill hole 21 boundary and internal structure is determined according to the imaging, and the ability of the imaging system to capture subtle differences under low contrast conditions is determined. In cooperation with the resolution test module 9, the resolution of the imaging system is accurately detected from high and low contrast, providing comprehensive, detailed and accurate data support for performance evaluation of medical imaging equipment, and ensuring the accuracy and reliability of oral disease diagnosis.

[0037] In example 5, based on example 4, the improvement of this example is that, as shown in Figure 1 、 Figure 2 、 Figure 4 and, Figure 5 、 Figure 6 and Figure 7 The upper surface of the spatial resolution test card 12 is provided with a low contrast resolution module 31 and a high contrast resolution module 33. The outer surface of the positioning plate 4 is fixedly connected with a sealing gasket 30. The outer surface of the sealing gasket 30 is in contact with the inner wall of the PMMA protective shell 1 and the bottom surface of the clamping plate 2, respectively. The inner wall of the positioning plate 4 is fixedly connected with a hidden auxiliary handle 5. The upper surface and the bottom surface of the aluminum absorber 10 are respectively provided with two stable grooves 24 and four positioning holes 23. The bottom surface of the resolution test module 9 is fixedly connected with two stable plates 25. The outer surface of each stable plate 25 is slidably connected with the inside of the stable groove 24. The upper surface of each low contrast resolution test module 13 is fixedly connected with a positioning column 22. The outer surface of each positioning column 22 is carded with the inside of the positioning hole 23.

[0038] In the use of resolution performance detection model, the low contrast resolution module 31 and the high contrast resolution module 33 of the spatial resolution test card 12 are aimed at different contrast scenes, and under X-ray irradiation, the resolution performance of the imaging effect accurate evaluation system under different contrasts is accurately evaluated, key data for comprehensive detection is provided, the positioning plate 4 is tightly attached to the inner wall of the PMMA protective shell 1 and the bottom surface of the clamping plate 2 through the sealing gasket 30 on the outer surface, dust and other impurities are effectively prevented from entering to affect the detection, and the internal detection environment is stable, the hidden auxiliary handle 5 on the inner wall is convenient for the insertion and removal of the test card, and the use convenience is improved. The aluminum absorber 10 is slidably connected with the stabilizing plate 25 of the resolution test module 9 through the stabilizing grooves 24 on the upper and lower surfaces, and is clamped with the positioning column 22 of the low contrast resolution test module 13 through the positioning hole 23, so that the relative positions of the modules are accurately fixed, the absorption characteristics of human tissues to X-rays are simulated stably during detection, the ray distribution meets the detection requirements, and the detection model is stably operated in all directions, and the resolution of the imaging system is accurately determined.

[0039] Working principle: in use, the PMMA protective shell 1 is used as the core protection and support structure, and the bottom plate 18, the resolution test module 9, the aluminum absorber 10, the low contrast resolution test module 13 and the spatial resolution test card 12 are sequentially installed inside; the aluminum absorber 10 and the low contrast resolution test module 13 are clamped through the positioning hole 23 and the positioning column 22, the X-ray characteristics of human tissues are accurately simulated, the distribution of rays is regulated, the drilling 21 of the low contrast resolution test module 13 is used for detecting the low contrast resolution performance, and the low contrast resolution module 31 and the high contrast resolution module 33 on the spatial resolution test card 12 are used for detecting from multiple contrast dimensions; the resolution test module 9 and the low contrast resolution test module 13 are slidably installed in the installation groove 35 in the PMMA protective shell 1 through the installation plate 15, then the clamping plate 2 is clamped into the clamping port 11 and fixed through the second fixing bolt 3, the sealing gasket 30 of the positioning plate 4 guarantees the sealing effect between the PMMA protective shell 1 during the insertion process of the spatial resolution test card 12, the hidden auxiliary handle 5 is convenient for operation and pulling out, the bottom surface is rotationally connected with the PMMA sealing cover 7 and tightly fixed through the two first fixing bolts 19, the overall sealing property and stability are ensured, external interference factors are effectively blocked, during the insertion process of the spatial resolution test card 12 into the PMMA protective shell 1, the four positioning blocks 34 on the right side of the spatial resolution test card 12 slide along the limiting groove 37 of the inner wall of the PMMA protective shell 1 until entering the predetermined position, at this time, the two arc-shaped clamping grooves 42 on the outer surface of the positioning block 34 and the arc-shaped positioning groove 32 in the grooves are just aligned with the positioning ball 39 in the self-locking groove 40 in the inner wall of the limiting groove 37, under the elastic force of the buffer spring 38, the positioning ball 39 is popped out and embedded into the arc-shaped clamping groove 42 and the arc-shaped positioning groove 32, precise positioning and stable clamping are realized, on one hand, the cooperation of the arc-shaped clamping groove 42 and the positioning ball 39 limits the movement of the positioning block 34 in the horizontal direction, preventing the test card from shifting left and right;On the other hand, the nesting of the arc-shaped positioning groove 32 and the positioning ball 39 further enhances the positioning accuracy in the vertical direction, eliminates the up-and-down movement of the test card, ensures that the spatial resolution test card 12 is always in the precise detection position during the detection process, guarantees the accuracy and stability of the X-ray imaging analysis, and even if the detection process is subjected to a certain degree of vibration or external force interference, the positioning stable structure can rely on the elastic buffering of the buffer spring 38 and the close fitting relationship of the positioning ball 39 and the arc-shaped fitting groove 42, the arc-shaped positioning groove 32 to maintain the stable state of the test card, and guarantee the reliability and consistency of the detection results. The socket 14 on the front surface of the base plate 18 provides a precise channel for the insertion of external equipment such as a dosimeter probe, and when the dosimeter probe is inserted, it will touch the movable plate 6, which is controlled by the elastic force of the return spring 20 in the pressure groove 36, and its externally connected spherical block 8 moves synchronously with the abutting plate 41. After the probe is in place, the return spring 20 pushes the movable plate 6 to reset, making the spherical block 8 and the abutting plate 41 tightly abut the side of the probe, providing lateral support and buffering to ensure the stability of the probe position. The resolution test module 9 is stably installed in the installation groove 35 by the installation plate 15 and is connected to the aluminum absorber 10 through the stable plate 25 and the stable groove 24, and its decreasing ring 16 depends on the high-resolution capability of the X-ray penetration imaging evaluation system. The silicone rubber plate 17 in the arc-shaped auxiliary groove 29 and other structures such as the spatial resolution plug-in 27 can slide as needed, and appropriate spatial resolution plug-ins 27 can be installed according to requirements. The soft PVC strip 28 and the outer protective plate 26 can reduce the surface friction of the silicone rubber plate 17, making it easy to slide inside the arc-shaped auxiliary groove 29, increasing the detection effect, and also assisting medical personnel in further detecting the oral cavity, enriching the detection scene, and ensuring the accurate positioning and stable cooperation of each component during detection, providing a solid guarantee for accurately determining the resolution of the imaging system, and effectively promoting the accuracy and reliability of the performance evaluation of the medical intraoral X-ray imaging system, meeting the high-standard requirements of oral medical detection.

[0040] The above is only to illustrate the present application, and it should be understood that the present application is not limited to the above embodiments, and various modifications in accordance with the spirit of the present application are within the scope of the present application.

Claims

1. A resolution performance testing phantom for use in a medical intraoral X-ray imaging system, comprising a PMMA protective shell (1), characterized in that: The PMMA protective shell (1) has a base plate (18) inside. A PMMA sealing cap (7) is rotatably connected to the bottom surface of the PMMA protective shell (1). The upper surface of the PMMA sealing cap (7) is in contact with the bottom surface of the base plate (18). The inner wall of the PMMA protective shell (1) and the inner wall of the PMMA sealing cap (7) are threaded together by two first fixing bolts (19). Two sets of mounting grooves (35) and a card interface (11) are respectively opened on the left side of the PMMA protective shell (1). An insertion port (14) is opened on the front of the base plate (18). The PMMA protective shell (1) has a resolution test module (9), an aluminum absorber (10), a low contrast resolution test module (13), and a low contrast resolution test module (14) inside. A spatial resolution test card (12) is provided. A positioning plate (4) is fixedly connected to the left side of the spatial resolution test card (12). The outer surface of the positioning plate (4) is engaged with the interior of the PMMA protective shell (1). A snap-fit ​​plate (2) is engaged with the interior of the snap-fit ​​interface (11). The inner wall of the snap-fit ​​plate (2) and the inner wall of the PMMA protective shell (1) are threaded together with four second fixing bolts (3). Two mounting plates (15) are slidably connected inside each set of mounting slots (35). The outer surface of the resolution test module (9) and the outer surface of the low contrast resolution test module (13) are fixedly connected to the side of the two sets of mounting plates (15) that are close to each other. A positioning stabilization unit is provided inside the PMMA protective shell (1).

2. The resolution performance testing phantom for a medical intraoral X-ray imaging system according to claim 1, characterized in that: The positioning stabilization unit includes four positioning blocks (34). The left side of each positioning block (34) is fixedly connected to the right side of the spatial resolution test card (12). The outer surface of each positioning block (34) has two arc-shaped locking grooves (42). The inner wall of each arc-shaped locking groove (42) has an arc-shaped positioning groove (32). The inner side wall of the PMMA protective shell (1) has a limiting groove (37). The inside of the limiting groove (37) is locked to the outer surface of the spatial resolution test card (12). The inner wall of the limiting groove (37) has four self-locking grooves (40). The inner wall of each self-locking groove (40) is fixedly connected to two buffer springs (38). One end of each buffer spring (38) is fixedly connected to a positioning ball (39). The outer surface of each positioning ball (39) is locked to the inside of the arc-shaped locking groove (42) and the inside of the arc-shaped positioning groove (32).

3. The resolution performance testing phantom for a medical intraoral X-ray imaging system according to claim 1, characterized in that: The positioning and stabilizing unit also includes two movable plates (6). The inner wall of the PMMA protective shell (1) has two pressure grooves (36). Each pressure groove (36) is fixedly connected to three return springs (20). One end of each of the three return springs (20) is fixedly connected to the outer surface of the movable plate (6). Each movable plate (6) is fixedly connected to the outer surface of the outer surface of the outer plate (6). Each spherical block (8) is fixedly connected to the outer surface of the outer surface of the outer surface of the outer surface of the outer spherical block (8). A bonding plate (41) is fixedly connected to the outer surface of the outer surface of the outer spherical block (8).

4. The resolution performance testing phantom for a medical intraoral X-ray imaging system according to claim 1, characterized in that: The resolution test module (9) has a decreasing ring (16) on its upper surface and four arc-shaped auxiliary grooves (29) on its outer surface. Each arc-shaped auxiliary groove (29) is slidably connected to a silicone rubber plate (17). Each silicone rubber plate (17) is fixedly connected to four soft PVC strips (28) and an outer protective plate (26) on its outer surface. One end of each soft PVC strip (28) is fixedly connected to the outer surface of the outer protective plate (26). Each silicone rubber plate (17) is fixedly connected to several identical spatial resolution inserts (27) on its inner wall. The low contrast resolution test module (13) has four drill holes (21) of different sizes on its upper surface.

5. The resolution performance testing phantom for a medical intraoral X-ray imaging system according to claim 1, characterized in that: The upper surface of the spatial resolution test card (12) is provided with a low contrast resolution module (31) and a high contrast resolution module (33). The outer surface of the positioning plate (4) is fixedly connected with a sealing gasket (30). The outer surface of the sealing gasket (30) is in contact with the inner wall of the PMMA protective shell (1) and the bottom surface of the snap-fit ​​plate (2). The inner wall of the positioning plate (4) is fixedly connected with a hidden auxiliary handle (5).

6. The resolution performance testing phantom for a medical intraoral X-ray imaging system according to claim 1, characterized in that: The aluminum absorber (10) has two stabilizing grooves (24) and four positioning holes (23) on its upper and lower surfaces, respectively. The resolution test module (9) has two stabilizing plates (25) fixedly connected to its bottom surface. The outer surface of each stabilizing plate (25) is slidably connected to the inside of the stabilizing groove (24). The upper surface of each low contrast resolution test module (13) is fixedly connected to a positioning post (22). The outer surface of each positioning post (22) is engaged with the inside of the positioning hole (23).

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