Die body for detecting quality of CT (Computed Tomography) image

Abstract

The die body for CT image quality detection comprises a main body, the main body comprises a first module, a second module and a third module which are arranged in a stacked mode, and the second module comprises a first detection unit, a connection unit and a second detection unit. The connecting unit is used for connecting the first detection unit and the second detection unit, the first module is used for detecting uniformity, the first detection unit is used for detecting three-dimensional deformation, the second detection unit is used for detecting spatial resolution, and the third module is used for detecting artifacts. According to the technical scheme, the quality of the CT image can be evaluated in a more comprehensive and scientific mode, so that under the action of mutual cooperation of the first module, the second module and the third module, the artifact removal effect can be verified, the spatial resolution, uniformity and three-dimensional deformation can be detected, and the CT image quality can be evaluated in a more comprehensive and scientific mode. Therefore, the performance of the CT equipment can be reflected more comprehensively and scientifically.

Description

Technical Field

[0001] This application relates to the technical field of CT image quality detection, and further to a phantom for CT image quality detection. Background Technology

[0002] CT (Computed Tomography) is a scanning technique that uses a precisely collimated X-ray beam and a highly sensitive detector to scan a specific part of the human body one section after another. It features fast scanning time, clear images, and high geometric accuracy, and can be used to examine a variety of diseases and display anatomical structures.

[0003] The image quality of a CT scan is crucial, as it significantly impacts a doctor's ability to accurately diagnose a patient's condition using CT images. Key indicators of CT image quality include metal artifacts, spatial resolution, 3D distortion, and homogeneity. Metal artifacts occur when metallic foreign objects within or on the patient's body cause uneven local magnetic fields, resulting in a low-signal blind zone or distorted, warped, or falsified images around the metal object. Spatial resolution relates to the smallest detail that can be displayed in a CT image and is typically related to pixel size; smaller pixels result in higher spatial resolution and a clearer image. Homogeneity measures the uniformity and noise reduction of a CT image. Image distortion refers to deformation occurring at the image edges.

[0004] Currently, in order to obtain high-quality CT images, it is necessary to use special processing phantoms to perform a series of calibration tests on CT equipment. However, the existing phantoms have relatively limited functions and can only perform corrections on one of the following: artifacts, resolution, deformation, and uniformity. They cannot perform comprehensive testing and verification of CT equipment.

[0005] Therefore, this utility model aims to provide a phantom for CT image quality detection to solve the above-mentioned technical problems. Utility Model Content

[0006] To address the aforementioned technical problems, the purpose of this application is to provide a phantom for CT image quality detection. Under the action of the first, second, and third modules, it can perform various types of detection, thereby providing a more comprehensive and scientific evaluation of the performance of CT equipment and the quality of CT images.

[0007] To achieve the above objectives, this application provides a phantom for CT image quality detection, characterized in that it includes a main body, the main body including a first module, a second module and a third module stacked together, the second module including a first detection unit, a connecting unit and a second detection unit, the connecting unit being used to connect the first detection unit and the second detection unit;

[0008] The first module is used to detect uniformity, the first detection unit is used to detect three-dimensional deformation, the second detection unit is used to detect spatial resolution, and the third module is used to detect artifacts.

[0009] In some implementations, the first detection unit is provided with a plurality of boundary modules, each of which includes a plurality of vias.

[0010] In some embodiments, the second detection unit is embedded with a plurality of wire pair modules, each of the wire pair modules including a plurality of embedded blocks.

[0011] In some embodiments, the third module is provided with a plurality of plug-in modules, each of the plug-in modules including a plurality of positioning rods arranged along the extension direction of the main body, and each positioning rod being arranged perpendicular to the extension direction of the main body.

[0012] The third module is provided with a positioning hole that cooperates with the positioning rod, so that the positioning rod can be detachably mounted on the third module through the positioning hole.

[0013] In some embodiments, a boundary module is provided at the center of the first detection unit, and a plurality of boundary modules are uniformly arranged along the circumference of the first detection unit.

[0014] Each of the boundary modules includes a plurality of boundary components arranged side by side at intervals. Each boundary component is composed of a plurality of vias. The plurality of vias of each boundary component are arranged side by side at intervals along a direction perpendicular to the extension direction of the boundary module.

[0015] In some embodiments, a plurality of the line pair modules are arranged at intervals along an extension direction perpendicular to the main body;

[0016] The line pair module includes several embedded components arranged side by side at intervals. Each embedded component consists of several embedded blocks, and the embedded blocks of each embedded component are arranged side by side at intervals along an extension direction perpendicular to the main body.

[0017] In some embodiments, the plug-in module is configured as two sets, namely a first plug-in module and a second plug-in module, wherein the positioning bar of the second plug-in module is arranged perpendicularly to the positioning bar of the first plug-in module.

[0018] The positioning rods of the first plug-in module are arranged in pairs between two adjacent positioning rods of the second plug-in module.

[0019] In some embodiments, the material of the first module is solid water;

[0020] and / or

[0021] The material of the second module and the third module is polymethyl methacrylate.

[0022] In some implementations, the first module is located on the side of the first detection unit away from the connection unit, and the third module is located on the side of the second detection unit away from the connection unit.

[0023] In some embodiments, the inner diameter of the via in each of the boundary modules gradually increases or decreases along the extension direction of the boundary module.

[0024] Compared with the prior art, the phantom for CT image quality detection provided in this application has the following advantages:

[0025] 1. This utility model provides a phantom for CT image quality detection, the main body of which includes a first module, a second module and a third module. The first module is used to detect uniformity, the third module is used to detect the artifact removal effect, the first detection unit of the second module can detect three-dimensional deformation, and the second detection unit can detect spatial resolution, so that the phantom can more comprehensively and scientifically detect the performance of CT equipment and the quality of CT images. Moreover, the stacked arrangement of the first module, the second module and the third module can significantly reduce the volume of the phantom, improve compactness, and broaden the application range.

[0026] 2. The present invention provides a phantom for CT image quality detection, wherein a plurality of boundary modules are provided in a first detection unit, each boundary module being composed of a plurality of vias. One boundary module is located at the center of the first detection unit and is capable of detecting spatial resolution. Multiple boundary modules are arranged along the circumference of the first detection unit and are used to measure three-dimensional deformation, so that multiple functions can be detected by means of the first detection unit alone.

[0027] 3. The present invention provides a phantom for CT image quality detection, wherein a number of line pair modules are set in the second detection unit. The line pair modules are composed of a number of embedding blocks. By setting the embedding blocks, the number of black and white stripes and gaps that can be visually distinguished per centimeter in the CT image can be determined, and the spatial resolution can be detected by the number of line pairs on the line pair test card through the embedding blocks.

[0028] 4. The present invention provides a phantom for CT image quality detection. The third module is provided with several plug-in modules consisting of several positioning rods. The positioning rods can be used to simulate human tissues such as bones to provide additional reference information during image reconstruction and help detect and identify artifacts. Attached Figure Description

[0029] The preferred embodiments will now be described in a clear and easy-to-understand manner, in conjunction with the accompanying drawings, to further explain the above-mentioned characteristics, technical features, advantages, and implementation methods of this application.

[0030] Figure 1 This is a schematic diagram of the structure of a phantom for CT image quality detection provided by the utility model;

[0031] Figure 2 This is a schematic diagram of the internal structure of a phantom for CT image quality detection provided by the utility model;

[0032] Figure 3 This is an exploded view of a phantom used for CT image quality detection, provided by the utility model.

[0033] Explanation of icon numbers:

[0034] First module 1, second module 2, first detection unit 21, boundary module 211, through hole 212, connection unit 22, second detection unit 23, wire pair module 231, embedding block 232, third module 3, plug-in module 31, positioning rod 311. Detailed Implementation

[0035] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the specific implementation methods of this application will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without creative effort.

[0036] To keep the drawings concise, each drawing only schematically shows the parts relevant to the application; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of components with the same structure or function is schematically shown, or only one is labeled. In this document, "one" can mean not only "only one" but also "more than one."

[0037] It should also be further understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0038] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0039] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0040] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0041] In one embodiment, a phantom for CT image quality detection is described, which enriches the detection function of the phantom by setting a first module 1, a second module 2 and a third module 3 to detect different types of parameters, thereby enabling a more comprehensive and scientific evaluation of the performance of CT equipment and the quality of CT images.

[0042] Understandably, CT (Computed Tomography) is a medical imaging technology that uses X-rays and computer processing to generate cross-sectional images of internal body structures. CT images are crucial tools for doctors to accurately diagnose patients' conditions, and key indicators of CT image quality include metal artifacts, spatial resolution, 3D deformation, and homogeneity. Current technologies often use CT scanners to scan phantoms, objectively evaluating the performance of the CT equipment and obtaining images of different tissue structures. By analyzing these images' homogeneity, resolution artifacts, and other indicators, the image quality of the CT equipment can be assessed. Generally, different phantom structures correspond to different detection types, but current phantom technologies are relatively limited in function, only capable of detecting one indicator, making it difficult to comprehensively test and verify the CT equipment.

[0043] For this purpose, please refer to the instruction manual appendix. Figures 1 to 3This embodiment provides a phantom for CT image quality detection, comprising a main body, which includes a first module 1, a second module 2, and a third module 3 stacked on top of each other. Correspondingly, the second module 2 contains three parts: a first detection unit 21, a connecting unit 22, and a second detection unit 23, wherein the connecting unit 22 mainly serves to connect the first detection unit 21 and the second detection unit 23.

[0044] The primary function of the first module 1 is to detect uniformity. In the second module 2, the first detection unit 21 is used to detect the magnitude of three-dimensional deformation, and the second detection unit 23 is used to detect spatial resolution. Correspondingly, the third module 3 is used to identify and detect artifacts.

[0045] It should be noted that the mold body is a single unit, cylindrical in shape, typically 26 cm high and 20 cm in diameter. This design not only facilitates use but also enhances its aesthetic appeal. Of course, in actual production applications, the mold body can also be other shapes, such as square or elliptical, to achieve various types of testing. These will not be elaborated upon here, but are all within the scope of this utility model.

[0046] In this embodiment, the provided phantom can simultaneously detect uniformity, three-dimensional deformation, spatial resolution, and artifacts without requiring staff to replace it. This significantly improves detection efficiency and effectively enhances the comprehensiveness and scientific rigor of CT equipment and CT image detection. Consequently, it enables more comprehensive and accurate calibration of the CT equipment, allowing doctors to accurately diagnose the condition based on CT images.

[0047] In one embodiment, see the appendix to the specification. Figure 3 This embodiment further describes the first detection unit 21. The first detection unit 21 contains several boundary modules 211, each including several vias 212. The boundary modules 211 are used to detect three-dimensional deformation and determine the degree of displacement and deformation in the CT image.

[0048] Furthermore, a boundary module 211 is disposed at the center of the first detection unit 21, and multiple boundary modules 211 are uniformly disposed along the circumference of the first detection unit 21. The boundary module 211 located at the center of the first detection unit 21 is used to detect spatial resolution, and the multiple boundary modules 211 disposed along the circumference of the first detection unit 21 are used to detect three-dimensional deformation.

[0049] Specifically, each boundary module 211 includes a number of boundary components arranged side by side, each boundary component is composed of a number of vias 212, and the number of vias 212 of each boundary component are arranged side by side along the extension direction perpendicular to the boundary module 211.

[0050] Understandably, the boundary module 211 is configured with a number of vias 212. The vias 212 located at the center of the first detection unit 21 can have their positions measured in CT images by a CT scanner, allowing for the evaluation of the image's spatial linearity. The vias 212 in the phantom are arranged in a specific geometric shape, and the presence of geometric distortion is determined by measuring the distance between the center points of adjacent vias 212. These measurements help evaluate the imaging accuracy and consistency of the CT scanner in different directions, thereby determining three-dimensional deformation. Furthermore, by clearly distinguishing the aperture size of the vias 212, the CT scanner can determine the spatial resolution of the CT image.

[0051] See the instruction manual appendix Figure 1 In this embodiment, each boundary module 211 includes five boundary components, and each boundary component is provided with four vias 212. The distance between the center points of two adjacent vias 212 of each boundary component is set to twice the diameter of the via 212. The four boundary modules 211 are arranged circumferentially along the first detection unit 21. The diameter of the vias 212 of two adjacent boundary modules 211 gradually decreases in the clockwise direction, and the diameter of the vias 212 of two other adjacent boundary modules 211 gradually increases in the clockwise direction.

[0052] In addition, preferably, the aperture of the via 212 of each boundary module 211 gradually increases or decreases along the extension direction of the boundary module 211, and the inner diameters of the via 212 of the five boundary components are set to 0.80mm, 1.00mm, 1.20mm, 1.4mm and 2.00mm respectively. By setting vias 212 of different sizes, a more accurate spatial resolution can be obtained.

[0053] In this embodiment, by setting multiple boundary modules 211 in the first detection unit 21, spatial resolution and three-dimensional deformation detection can be achieved simultaneously through the first detection unit 21, which enriches the detection function of the model and improves the compactness of the model.

[0054] Of course, in actual production applications, there are various structures to achieve detection spatial resolution and three-dimensional deformation, and there are also various ways to set the via 212 in the first detection unit 21. These will not be described one by one here, but are all within the protection scope of this utility model.

[0055] In one embodiment, see the appendix to the specification. Figure 1 This embodiment provides a second detection unit 23 which is embedded with multiple wire pair modules 231. Correspondingly, each wire pair module 231 includes several embedded blocks 232.

[0056] Specifically, several wire pair modules 231 are arranged sequentially at intervals along an extension direction perpendicular to the main body. Each wire pair module 231 includes several embedded components arranged side by side at intervals, and several embedded blocks 232 form an embedded component. In addition, several embedded blocks 232 of each embedded component are arranged side by side at intervals along an extension direction perpendicular to the main body.

[0057] It should be noted that the distance between two adjacent embedding blocks 232 of each embedding component is smaller than the distance between two adjacent embedding components. This allows for the evaluation of spatial resolution by determining the number of the largest resolvable black and white stripes and gaps per centimeter in the CT image, and by measuring the number of line pairs on the line pair test card using the embedding block 232.

[0058] For practical production applications, please refer to the appendix of the instruction manual. Figure 1 The second detection unit 23 embeds two line pair modules 231, which are arranged at intervals. Each line pair module 231 includes seven embedding components, and each embedding component includes four embedding blocks 232. Accordingly, the thickness of the embedding blocks 232 is between 0.31 mm and 1.67 mm, so that the line pair modules 231 within the second detection unit 23 form a line pair count of 3 lp / cm to 16 lp / cm on the line pair test card. Furthermore, the density of the embedding blocks 232 is set to be greater than that of the second detection unit 23, and they are generally made of metal materials such as aluminum. This allows for the simulation of high-contrast structures in CT imaging, where spatial resolution is a crucial indicator of CT equipment performance. By setting the embedding blocks 232 within the phantom, these high-contrast structures can be simulated, thereby evaluating the spatial resolution of the CT equipment.

[0059] Of course, in actual production applications, the detection resolution set in the second detection unit 23 can also be set to other structures, which will not be described one by one here, and are all within the protection scope of this utility model.

[0060] In addition, both the first detection unit 21 and the second detection unit 23 can detect spatial resolution. Staff can combine the detection results of the two units to further improve the accuracy of spatial resolution detection.

[0061] In one embodiment, see the appendix to the specification. Figure 1 This embodiment further describes the third module 3. The third module 3 is provided with several plug-in modules 31, each module including several positioning rods 311. These positioning rods 311 are arranged sequentially along the extension direction of the main body, and each positioning rod 311 is perpendicular to the extension direction of the main body. Correspondingly, the third module 3 is provided with positioning holes that mate with the positioning rods 311, allowing one end of each positioning rod 311 to be inserted into the positioning rod 311, thus enabling the positioning rod 311 to be detachably inserted into the third module 3.

[0062] Generally, the diameter of the positioning hole is slightly larger than the outer diameter of one end of the positioning rod 311. After inserting one end of the positioning rod 311 into the positioning hole, a substance similar to human soft tissue, such as gel, can be poured into the positioning hole to compress and fix the positioning rod 311. In addition, the material of the positioning rod 311 can be made of titanium alloy or the like.

[0063] Furthermore, in one embodiment, the plug-in module 31 is configured as two sets, namely a first plug-in module and a second plug-in module, as detailed in the appendix to the specification. Figure 2 The positioning rod 311 of the second plug-in module is perpendicular to the positioning rod 311 of the first plug-in module. In addition, the positioning rods 311 of the first plug-in module are arranged in pairs between two adjacent positioning rods 311 of the second plug-in module.

[0064] Understandably, these positioning rods 311 can simulate the effects of high-attenuation materials in CT scans, helping to evaluate and test the performance of CT equipment when processing high-density materials, including the generation and distribution of artifacts. Furthermore, the positional relationship between the positioning rods 311 in the first and second insertion / removal modules allows for the simultaneous testing of artifact variation patterns across multiple positioning rods 311 at different levels, enabling a more comprehensive evaluation of CT equipment artifacts.

[0065] Of course, in actual production applications, the positional relationship of the positioning rods 311 of the first plug-in module and the second plug-in module can also be set in other ways, such as each positioning rod 311 of the first plug-in module being inserted between two adjacent positioning rods 311 of the second plug-in module.

[0066] In one embodiment, the material of the first module 1 is solid water, used for detecting uniformity. Generally, the first module 1 uses non-transparent solid water to ensure imaging effects for various types of CT equipment. Additionally, the materials of the second module 2 and the third module 3 are both made of polymeric materials such as polymethyl methacrylate (PMMA). PMMA is an excellent transparent polymeric material with high light transmittance, which allows the phantom to provide clear images during detection, facilitating observation and analysis. Furthermore, PMMA has a low density and good soft tissue equivalence, making the phantom more accurate in simulating the attenuation characteristics of human soft tissue to X-rays, thus improving detection accuracy. Moreover, the use of PMMA allows for the addition of different materials to the second module 2 and the third module 3 to simulate bone equivalence.

[0067] In one embodiment, the first module 1 is disposed on the side of the first detection unit 21 away from the connecting unit 22, and the third module 3 is disposed on the side of the second detection unit 23 away from the connecting unit 22. In actual production applications, the main body can be integrally formed, so that the first module 1, the second module 2, and the third module 3 are a whole. Of course, the first module 1, the second module 2, and the third module 3 can also be separately disposed and combined into the main body, and a shell matching the main body is disposed on the outside of the main body.

[0068] It should be noted that the above embodiments can be freely combined as needed. The above are merely preferred embodiments of this application. It should be pointed out that for those skilled in the art, several improvements and modifications can be made without departing from the principles of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A phantom for CT image quality inspection, characterized in that, The system includes a main body, which includes a first module, a second module, and a third module stacked together. The second module includes a first detection unit, a connection unit, and a second detection unit. The connection unit is used to connect the first detection unit and the second detection unit. The first module is used to detect uniformity, the first detection unit is used to detect three-dimensional deformation, the second detection unit is used to detect spatial resolution, and the third module is used to detect artifacts.

2. The phantom for CT image quality detection according to claim 1, characterized in that, The first detection unit is provided with a number of boundary modules, and each boundary module includes a number of vias.

3. The phantom for CT image quality detection according to claim 2, characterized in that, The second detection unit is embedded with several line pair modules, and each line pair module includes several embedded blocks.

4. The phantom for CT image quality detection according to claim 3, characterized in that, The third module is provided with a plurality of plug-in modules, each of which includes a plurality of positioning rods arranged along the extension direction of the main body, and each positioning rod is arranged perpendicular to the extension direction of the main body. The third module is provided with a positioning hole that cooperates with the positioning rod, so that the positioning rod can be detachably mounted on the third module through the positioning hole.

5. A phantom for CT image quality detection according to claim 2, characterized in that, One of the boundary modules is disposed at the center of the first detection unit for detecting spatial resolution, and multiple boundary modules are uniformly disposed along the circumference of the first detection unit for detecting three-dimensional deformation. Each of the boundary modules includes a plurality of boundary components arranged side by side at intervals. Each boundary component is composed of a plurality of vias. The plurality of vias of each boundary component are arranged side by side at intervals along a direction perpendicular to the extension direction of the boundary module.

6. A phantom for CT image quality detection according to claim 3, characterized in that, Several of the aforementioned line pair modules are arranged at intervals along an extension direction perpendicular to the main body; The line pair module includes several embedded components arranged side by side at intervals. Each embedded component consists of several embedded blocks, and the embedded blocks of each embedded component are arranged side by side at intervals along an extension direction perpendicular to the main body.

7. A phantom for CT image quality detection according to claim 4, characterized in that, The plug-in / plug-out module is configured in two groups, namely a first plug-in / plug-out module and a second plug-in / plug-out module, wherein the positioning bar of the second plug-in / plug-out module is perpendicular to the positioning bar of the first plug-in / plug-out module. The positioning rods of the first plug-in module are arranged in pairs between two adjacent positioning rods of the second plug-in module.

8. A phantom for CT image quality detection according to any one of claims 1-7, characterized in that, The material of the first module is solid water; and / or The material of the second module and the third module is polymethyl methacrylate.

9. A phantom for CT image quality detection according to claim 8, characterized in that, The first module is located on the side of the first detection unit away from the connection unit, and the third module is located on the side of the second detection unit away from the connection unit.

10. A phantom for CT image quality detection according to claim 5, characterized in that, The inner diameter of the via in each boundary module gradually increases or decreases along the extension direction of the boundary module.

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