Movable head cone beam ct performance detection phantom and method of use

Abstract

The application discloses a kind of for mobile head cone beam CT performance detection phantom, including detachable connection imaging uniformity module, imaging distortion module, image dynamic range module, imaging consistency module, artifact and extension function imaging module, imaging linearity module, imaging capacity module, imaging distance module, low contrast test module, high contrast test module and imaging adhesion test module.The application meets the test demand that traditional detection phantom or tool is difficult to reach the complexity of head soft tissue imaging, can carry out performance test to the head soft tissue imaging of mobile head cone beam CT, makes up the lack of domestic and foreign detection basis or standard.

Description

Technical Field

[0001] This invention relates to the field of medical X-ray detection technology, and in particular to a phantom for testing the performance of mobile head cone-beam CT and its method of use. Background Technology

[0002] Since the advent of cone-beam computed tomography (CBCT) equipment in the last century, its X-ray examination technology has become increasingly sophisticated. CBCT is one of the standard medical devices in hospital radiology departments and other departments, and it is also one of the necessary examination devices for radiological examinations of patients or examinees.

[0003] CBCT is short for Cone Beam CT. As the name suggests, it's a device that uses cone-beam X-rays to project and then uses a computer to reconstruct tomographic images. The principle is that an X-ray tube generator delivers a low dose of radiation around the area being examined in a circumferential digital projection. The images are then intersected and processed, and the resulting data is reconstructed and fitted in a computer to obtain a three-dimensional reconstructed image. It can even visualize each thin slice of the reconstructed image, facilitating clinical interpretation by radiologists. Currently used types of equipment include dental CBCT, breast CBCT, C-arm CBCT, and medical electron accelerator CBCT.

[0004] Statistics show that approximately 70%-85% of patient or examinee diagnostic information in hospitals comes from medical X-ray images. In clinical medicine, CBCT can acquire tomographic images of patients in transverse, sagittal, coronal, and various oblique planes, containing a large amount of information and visually displaying the internal structure, morphology, and composition of human tissues or organs, thus gaining widespread application. However, various factors affect its image quality, including not only the types and quality of CBCT systems produced by domestic and international manufacturers, but also the imaging principles and post-processing methods of the equipment itself. To ensure the quality of X-ray images for clinical patients or examinees, thereby facilitating physicians' interpretation of imaging results and achieving better diagnostic and treatment outcomes, both domestically and internationally, there has been a strong emphasis on performance testing of this type of equipment.

[0005] It is understood that in the acute phase of stroke and traumatic brain injury, plain CT scans are the preferred choice to understand structural damage and intracranial hemorrhage. They can clearly visualize the outline of blood in the brain, including epidural, subdural, and parenchymal damage. Accurate diagnosis of acute traumatic brain injury is particularly important for selecting appropriate treatment methods, especially when such imaging examinations can be performed on-site (ambulance, intensive care unit, emergency room, etc.) or directly at the scene of the brain injury (athletes or battlefield). In these situations, ordinary CT and MRI are unsuitable (due to their high cost, large footprint, and lack of portability). Mobile cone-beam computed tomography (CBCT) is one of the new radiological diagnostic devices available both domestically and internationally. In recent years, the newly developed mobile cone-beam computed tomography CT has become a new generation of CBCT due to its unique characteristics (portability, light weight, small footprint, low-cost maintenance, and low radiation dose), especially its brain tissue imaging quality, which has reached clinical diagnostic levels. Its planned applications are mainly in neurosurgery, spinal surgery, craniofacial surgery, otolaryngology, ICU, and emergency departments.

[0006] Before or during clinical application, the primary concern for this equipment is ensuring its imaging performance meets standards, stability, and the actual needs of clinical X-ray diagnosis. However, neither the international consensus "Quality control in cone-beam computed tomography (CBCT)" nor the health industry standard WS 818-2023 "Quality Control Testing Standard for Cone-Beam Computed Tomography (CBCT) Equipment" addresses the performance testing of mobile head cone-beam CT scanners. With the increasing use of mobile head cone-beam CT scanners in various international settings (medical institutions, high-speed trains, warships, etc.), performance testing of these scanners is becoming increasingly important. Currently, there are no dedicated testing tools or methods for mobile head cone-beam CT scanners. Testing can only assess certain indicators using existing tools and methods, completely detached from actual needs and problems. Consequently, the imaging performance quality of mobile head cone-beam CT scanners cannot be guaranteed during normal use, thus compromising the health and safety of patients and examinees.

[0007] Therefore, there is an urgent need for a dedicated testing phantom for mobile head cone-beam CT performance testing, so as to ensure the normal application of this equipment. Summary of the Invention

[0008] This invention provides, in one aspect, a phantom for testing the performance of mobile head cone-beam CT, to address the current lack of equipment capable of comprehensively testing the performance of mobile head cone-beam CT. In another aspect, this invention provides a method for using the phantom for testing the performance of mobile head cone-beam CT.

[0009] The first aspect of the present invention provides a mobile head cone-beam CT performance testing phantom, comprising a detachably connected imaging uniformity module, an imaging distortion module, an image dynamic range module, an imaging consistency module, an artifact and spread function imaging module, an imaging linearity module, an imaging capability module, an imaging distance module, a low contrast testing module, a high contrast testing module, and an imaging adhesion testing module.

[0010] The imaging uniformity module is used to measure the uniformity of the image distribution of a moving head cone-beam CT scan.

[0011] The imaging distortion module is used to measure the radiation distortion error and geometric distortion error of mobile head cone-beam CT images;

[0012] The image dynamic range module is used to measure the image dynamic range and axial imaging accuracy of moving head cone-beam CT images.

[0013] The imaging consistency module is used to measure the deviation and deformation error of the imaging size of mobile head cone-beam CT images in different regions.

[0014] The artifact and spread function imaging module is used to measure moving head cone-beam CT artifacts and image spread functions caused by different metals.

[0015] The imaging linearity module is used to measure the linearity and contrast-to-noise ratio of moving head cone-beam CT imaging;

[0016] The imaging capability module is used to test the contrast imaging capability of mobile head cone-beam CT.

[0017] The imaging distance module is used to test the distance error of the mobile head cone-beam CT system;

[0018] The low-contrast test module is used to test the low-contrast resolution of moving head cone-beam CT imaging.

[0019] The high-contrast test module is used to test spatial discontinuous resolution and spatial continuous resolution.

[0020] The imaging closeness test module is used to test whether there are image artifacts and image regularity in the imaging.

[0021] The aforementioned phantom for testing the performance of mobile head cone-beam CT is preferably described in that the imaging uniformity module includes a shell, the interior of which is provided with a cavity filled with pure water, and the shell is made of transparent plastic.

[0022] The aforementioned phantom for testing the performance of a mobile head cone-beam CT is preferably provided in which the imaging distortion module includes multiple square slots arranged alternately to form a square. The square slots contain materials of different densities, with high-density materials and low-density materials arranged alternately.

[0023] The aforementioned phantom for testing the performance of a mobile head cone-beam CT scanner, preferably, includes an image dynamic range module comprising a first substrate and multiple steps, wherein the first substrate has multiple steps, the thickness of adjacent steps gradually increases, the first substrate is made of plexiglass, and the steps are made of copper.

[0024] Preferably, in the mobile head cone-beam CT performance testing phantom, the imaging consistency module includes a second substrate, a first scale mark, a second scale mark, a third scale mark, and a fourth scale mark. The first scale mark, the second scale mark, the third scale mark, and the fourth scale mark form four equal parts on the surface of the second substrate. Each of the parts is provided with an equal number of circular modules, and each of the circular modules is provided with an equal number of segmented areas.

[0025] Preferably, in the mobile head cone-beam CT performance testing phantom, the artifact and spread function imaging module includes a first sub-module, a second sub-module, a third sub-module, a fourth sub-module, and a fifth sub-module.

[0026] The first small module includes two semicircular modules, which are assembled into a circle. The semicircular modules are made of plexiglass and polytetrafluoroethylene.

[0027] The second small module includes an acrylic glass with multiple titanium inserts inserted;

[0028] The third sub-module includes plexiglass with multiple lead inserts inserted;

[0029] The fourth sub-module includes plexiglass with a hollow center, and a metal wire is suspended at the center of the hollow center.

[0030] The fifth sub-module is plexiglass.

[0031] The aforementioned phantom for testing the performance of mobile head cone-beam CT is preferably provided in which the imaging linear module comprises multiple circular regions, each with a different material density at its center.

[0032] The aforementioned phantom for testing the performance of mobile head cone-beam CT is preferably described in that the imaging capability module includes multiple areas for placing materials, each area having a different material density, and each material within the area having multiple dimensions.

[0033] The aforementioned phantom for testing the performance of mobile head cone-beam CT preferably includes an imaging distance module comprising multiple imaging points arranged to form a square.

[0034] The aforementioned phantom for testing the performance of mobile head cone-beam CT is preferably described in that the low-contrast testing module includes a third substrate and inserts, wherein inserts of different materials are disposed on the third substrate, and the CT contrast between the material of the inserts and the material of the third substrate is 1%.

[0035] The aforementioned phantom for testing the performance of mobile head cone-beam CT preferably includes a high-contrast testing module comprising a strip-shaped high-contrast testing module and a fan-shaped high-contrast testing module. The imaging uniformity module, the imaging distortion module, the image dynamic range module, the imaging consistency module, the artifact and spread function imaging module, the imaging linearity module, the imaging capability module, the imaging distance module, the low-contrast testing module, the strip-shaped high-contrast testing module, the fan-shaped high-contrast testing module, and the imaging adhesion testing module are connected in sequence.

[0036] The aforementioned phantom for testing the performance of mobile head cone-beam CT, preferably, includes an imaging adhesion test module whose structure comprises a uniformly distributed and equally spaced metal mesh.

[0037] A second aspect of the present invention provides a method of using a mobile head cone-beam CT performance testing phantom, comprising the aforementioned mobile head cone-beam CT performance testing phantom, and the specific method of use includes the following steps:

[0038] The mobile head cone-beam CT performance testing phantom was mounted on the testing vehicle;

[0039] The device for adjusting the up, down, left, and right sides of the mobile head cone-beam CT performance testing phantom on the testing vehicle;

[0040] After positioning, the mobile head cone-beam CT is used to image the phantom in the normal clinical beam output mode. The image results of each module are then analyzed to determine whether the various detection indicators of the mobile head cone-beam CT meet the standards.

[0041] The testing vehicle includes pulleys, a vehicle body, and an adjustment device. The pulleys are located at the bottom of the vehicle body, and the adjustment device is located on the vehicle body. The adjustment device includes a bracket, an X-axis adjustment device, a Y-axis adjustment device, and a Z-axis adjustment device. The Z-axis adjustment device is mounted on the bracket, the X-axis adjustment device is mounted on the Z-axis adjustment device, the Y-axis adjustment device is mounted on the X-axis adjustment device, and the mobile head cone-beam CT performance testing phantom is mounted on the Y-axis adjustment device.

[0042] The method of using the mobile head cone-beam CT performance testing phantom is preferably described in that the X-axis adjustment device includes an X-axis crank, an X-axis connecting plate, an X-axis adjusting screw, an X-axis guide rod, and an X-axis connecting block. The X-axis connecting plate is fixed on the Z-axis adjustment device. One end of the X-axis adjusting screw is connected to the X-axis crank, and the other end of the X-axis adjusting screw is rotatably fixed on the X-axis connecting plate. The X-axis guide rods are provided on both sides of the X-axis adjusting screw. The X-axis connecting block is fixed on the X-axis adjusting screw and sleeved on the X-axis guide rod. The Y-axis adjustment device is fixed on the X-axis connecting block.

[0043] The method of using the mobile head cone-beam CT performance testing phantom is preferably described in that the Y-axis adjustment device includes a limiting adjustment plate, an adjustment component, and a fixing plate. The limiting adjustment plate is fixed to the X-axis connecting block. The fixing plate is rotatably connected to the limiting adjustment plate through the adjustment component. Furthermore, the limiting adjustment plate covers the top of the fixing plate, and the other end of the fixing plate is connected to the mobile head cone-beam CT performance testing phantom.

[0044] The method of using the mobile head cone-beam CT performance testing phantom is preferably described in that the adjustment assembly includes a rotating shaft and an adjusting bolt, the plate body of the fixed plate is connected to the plate body of the limiting adjustment plate through the rotating shaft, and the end of the fixed plate is fixed to the end of the limiting adjustment plate through the adjusting bolt.

[0045] The method of using the mobile head cone-beam CT performance testing phantom is preferably described in that the Z-axis adjustment device includes a Z-axis crank, a Z-axis adjustment screw, a Z-axis guide rod, and a Z-axis connecting block. One end of the Z-axis adjustment screw is connected to the Z-axis crank, and the other end of the Z-axis adjustment screw is rotatably fixed on the bracket. The Z-axis guide rods are provided on both sides of the Z-axis adjustment screw, and the Z-axis connecting block is provided on the Z-axis adjustment screw. The Z-axis connecting block is sleeved on the Z-axis guide rod, and the X-axis connecting plate is fixed on the Z-axis connecting block.

[0046] The beneficial effects are:

[0047] This invention provides a complete set of mobile head cone-beam CT performance testing tools to safeguard the imaging performance quality of the device, which helps clinicians better assess the condition of abnormal tissues such as brain injury, hemorrhage, and tumors in patients or examinees.

[0048] Traditional testing phantoms or tools are insufficient to meet the testing requirements of the complexity of head soft tissues. This invention enables performance testing of mobile cone-beam CT imaging of head soft tissues, filling the gap in domestic and international testing standards and methods. Attached Figure Description

[0049] Figure 1 A schematic diagram of the structure of a mobile head cone-beam CT performance testing phantom;

[0050] Figure 2 This is a schematic diagram of the imaging uniformity module.

[0051] Figure 3 This is a schematic diagram of the imaging distortion module.

[0052] Figure 4 This is a schematic diagram of the image dynamic range module.

[0053] Figure 5 This is a schematic diagram of the imaging consistency module;

[0054] Figure 6 A schematic diagram of the artifact and spread function imaging module;

[0055] Figure 7 This is a schematic diagram of the imaging linear module;

[0056] Figure 8 This is a schematic diagram of the imaging capability module.

[0057] Figure 9 This is a schematic diagram of the imaging distance module.

[0058] Figure 10 This is a schematic diagram of the low-contrast test module.

[0059] Figure 11-1 This is a schematic diagram of the sector-shaped resolution module;

[0060] Figure 11-2 For bar-resolved testing modules;

[0061] Figure 12 This is a schematic diagram of the imaging adhesion test module.

[0062] Figure 13 A 3D view of the inspection vehicle;

[0063] Figure 14 This is a rear view of the inspection vehicle.

[0064] In the picture,

[0065] 1. X-axis crank; 2. X-axis connecting plate; 3. X-axis adjusting screw; 4. X-axis guide rod;

[0066] 5. X-axis connecting block; 6. Limit adjustment plate; 7. Mobile head cone-beam CT performance testing phantom; 8. Fixing plate; 9. Rotating shaft; 10. Adjusting bolt; 11. Z-axis crank; 12. Z-axis adjusting screw; 13. Z-axis guide rod; 14. Z-axis connecting block; 15. Bracket; 16. Vehicle body; 17. Pulley; 18. Connecting hole; 19. Outer shell; 20. Cavity; 21. Water inlet;

[0067] 22. A square trough for placing low-density materials; 23. A square trough for placing high-density materials;

[0068] 24. First substrate; 25. Step; 26. Second substrate; 27. First scale mark;

[0069] 28. Second scale mark; 29. ​​Third scale mark; 30. Fourth scale mark;

[0070] 31. Circular module; 32. First small module; 33. Second small module; 34. Third small module; 35. Fourth small module; 36. Circular area; 37. Area for placing materials; 38. Imaging point; 39. Plug-in; 40. Third substrate; 41. Connecting rod;

[0071] 42. Metal mesh; 43. Compensation rod; 44. Imaging uniformity module;

[0072] 45. Imaging distortion module; 46. Image dynamic range module; 47. Imaging consistency module; 48. Artifact and spread function imaging module; 49. Imaging linearity module; 50. Imaging capability module;

[0073] 51. Imaging distance module; 52. Low contrast test module; 53. Bar high contrast test module;

[0074] 54. Fan-shaped high-contrast test module; 55. Imaging adhesion test module; 56. Fixing plate;

[0075] 57. The fifth sub-module. Detailed Implementation

[0076] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0077] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the system or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second," etc., are used to define components only for the convenience of distinguishing the aforementioned components. Unless otherwise stated, these terms have no special meaning and should not be construed as indicating or implying relative importance.

[0078] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the term "connection" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0079] This invention provides a phantom for testing the performance of mobile head cone-beam CT, comprising detachably connected imaging homogeneity module, imaging distortion module, image dynamic range module, imaging consistency module, artifact and spread function imaging module, imaging linearity module, imaging capability module, imaging distance module, low-contrast testing module, high-contrast testing module, and imaging adhesion testing module. The imaging homogeneity module measures the uniformity of mobile head cone-beam CT images; the imaging distortion module measures the radiation distortion error and geometric distortion error of mobile head cone-beam CT images; the image dynamic range module measures the image dynamic range and axial imaging accuracy of mobile head cone-beam CT images; and the imaging consistency module measures the uniformity of the images. The invention includes several key technologies: a mobile cone-beam computed tomography (CBCT) module for measuring image size deviation and distortion errors in different regions; an artifact and spread function imaging module for measuring artifacts and spread functions caused by different metals in mobile CBCT; an imaging linearity module for measuring the linearity and contrast-to-noise ratio of mobile CBCT imaging; an imaging capability module for testing the contrast imaging capability of mobile CBCT; an imaging distance module for testing the distance error of the mobile CBCT system; a low-contrast test module for testing the low-contrast resolution of mobile CBCT imaging; a high-contrast test module for testing spatial discontinuous resolution and spatial continuous resolution; and an imaging adhesion test module for testing the presence of image artifacts. Traditional detection phantoms or tools are insufficient to meet the testing requirements of the complexity of head soft tissues. This invention enables imaging of head soft tissues, filling the gap in domestic and international testing standards.

[0080] The following section uses a mobile head cone-beam CT performance testing phantom as an example to illustrate the entire technical process in detail.

[0081] Example 1

[0082] like Figures 1-10 , Figure 11-1 , Figure 11-2 and Figure 12 The diagram shows a phantom for testing the performance of a mobile head cone-beam CT, comprising a detachably connected imaging uniformity module 44, an imaging distortion module 45, an image dynamic range module 46, an imaging consistency module 47, an artifact and spread function imaging module 48, an imaging linearity module 49, an imaging capability module 50, an imaging distance module 51, a low-contrast testing module 52, a high-contrast testing module, and an imaging adhesion testing module 55.

[0083] One of the mobile head cone-beam CT performance testing phantoms 7 also includes a fixing plate 56. Preferably, the imaging uniformity module 44, the imaging distortion module 45, the image dynamic range module 46, the imaging consistency module 47, the artifact and spread function imaging module 48, the imaging linearity module 49, the imaging capability module 50, the imaging distance module 51, the low contrast test module 52, the high contrast test module, the imaging adhesion test module 55, and the fixing plate 56 are arranged and connected in sequence.

[0084] Among them, the imaging uniformity module 44, imaging distortion module 45, image dynamic range module 46, imaging consistency module 47, artifact and spread function imaging module 48, imaging linearity module 49, imaging capability module 50, imaging distance module 51, low contrast test module 52, high contrast test module and imaging adhesion test module 55 are provided with connecting holes 18 around them, and connecting rods 41 are provided in the connecting holes 18 to fix each module.

[0085] The connecting rod 41 is a long rod type dose detector, which serves two purposes: fixing the various modules and replacing the dose detector, thus also having the function of dose measurement. The number of connecting rods 41 can be 4 as shown in the figure, or 3, which can measure the dose at 0, 3, 6 and 9 points.

[0086] The imaging uniformity module 44, imaging distortion module 45, image dynamic range module 46, imaging consistency module 47, artifact and spread function imaging module 48, imaging linearity module 49, imaging capability module 50, imaging distance module 51, low contrast test module 52, high contrast test module and imaging adhesion test module 55 are equipped with a compensation rod 43 at the center.

[0087] like Figure 2As shown, the imaging uniformity module 44 includes a housing 19, and a cavity 20 is provided inside the housing 19. The cavity 20 is disc-shaped. The housing 19 is made of transparent plastic. A water inlet 21 is provided on the housing 19. The water inlet 21 is connected to the cavity 20. The cavity 20 is filled with pure water.

[0088] The imaging uniformity module 44 is used to measure the uniform distribution of images from a moving head cone-beam CT scanner. A uniform distribution indicates good imaging quality of the device.

[0089] like Figure 3 As shown, the imaging distortion module 45 includes multiple square slots, which are arranged alternately to form a square. The square slots contain materials of different densities, and square slots 23 for high-density materials and square slots 22 for low-density materials are arranged alternately. Specifically, the materials in the square slots 23 for high-density materials are all identical, and the materials in the square slots 22 for low-density materials are all identical.

[0090] The imaging distortion module 45 is used to measure the radiation distortion error and geometric distortion error of the moving head cone-beam CT image to indicate whether the imaging result is deformed or distorted from the actual situation.

[0091] like Figure 4 As shown, the image dynamic range module 46 includes a first substrate 24 and a plurality of steps 25. The first substrate 24 is provided with a plurality of steps 25, and the thickness of adjacent steps 25 gradually increases. The material of the first substrate 24 is plexiglass, and the material of the steps 25 is copper.

[0092] The image dynamic range module 46 is used to measure the image dynamic range and axial imaging accuracy of moving head cone-beam CT images, representing the imaging resolution and imaging capability of tissues of different thicknesses.

[0093] like Figure 5 As shown, the imaging consistency module 47 includes a second substrate 26, a first scale mark 27, a second scale mark 28, a third scale mark 29, and a fourth scale mark 30. The first scale mark 27, the second scale mark 28, the third scale mark 29, and the fourth scale mark 30 form four equal parts on the surface of the second substrate 26. Each of the parts is provided with an equal number of circular modules 31, and each of the circular modules 30 is provided with an equal number of segmented areas inside.

[0094] The imaging consistency module 47 is used to measure the deviation and deformation error of the imaging size of the moving head cone-beam CT image in different regions, indicating that the imaging results of each involved region are consistent throughout the entire radiation field.

[0095] like Figure 6As shown, the artifact and spread function imaging module 48 includes a first sub-module 32, a second sub-module 33, a third sub-module 34, a fourth sub-module 35, and a fifth sub-module 57;

[0096] The first sub-module 32 includes two semi-circular modules that are joined together to form a circle. The semi-circular modules are made of plexiglass and polytetrafluoroethylene. One half of the semi-circular module is high-density polytetrafluoroethylene and the other half is plexiglass. The boundary line is used to test the imaging line spread function.

[0097] The second sub-module 33 includes an acrylic glass with multiple titanium inserts inserted, and the third sub-module 34 includes an acrylic glass with multiple lead inserts inserted; the second sub-module 33 and the third sub-module 34 are artifact modules used for imaging artifacts;

[0098] The fourth sub-module 35 includes an organic glass with a cavity in the center, and a metal wire is suspended at the center of the cavity; that is, the metal wire is located at the center of the entire cavity, suspended, and fixed at both ends, for testing the extended function of the point.

[0099] The fifth sub-module, 57, is made of plexiglass.

[0100] like Figure 7 As shown, the imaging linear module 49 includes multiple circular regions 36, each with a different material density at its center.

[0101] The imaging linearity module 49 is used to measure the linearity and contrast-to-noise ratio of moving head cone-beam CT imaging, representing the difference between the imaging capability and the actual density of different human tissues.

[0102] like Figure 8 As shown, the imaging capability module 50 includes multiple material placement areas 37, each with a different material density and each material having multiple sizes.

[0103] The imaging capability module 50 is used to test the contrast imaging capability of mobile head cone-beam CT.

[0104] like Figure 9 As shown, the imaging distance module 51 includes multiple imaging points 38, which are arranged to form a square. Preferably, the size of each imaging point 38 is 2 mm, the center distance between adjacent imaging points 38 is 10 mm, and the total number of imaging points 38 is 80.

[0105] The imaging distance module 51 is used to test the distance error of the mobile head cone-beam CT system, representing the deviation between the imaging size and the actual size.

[0106] like Figure 10As shown, the low contrast test module 52 includes a third substrate 40 and plug-in 39. The third substrate 40 is provided with plug-in 39 of different materials. The CT contrast between the material of the plug-in 39 and the material of the third substrate 40 is 1%. The plug-in 39 is arranged in a circle from large to small. The size of the plug-in 39 is 2-15mm.

[0107] The low-contrast test module 52 is used to test the low-contrast resolution of mobile head cone-beam CT imaging, representing the device's ability to image low-density tissues.

[0108] like Figure 11-1 and Figure 11-2 As shown, the high contrast test module includes a bar high contrast test module 53 and a fan-shaped high contrast test module 54.

[0109] The imaging uniformity module 44, imaging distortion module 45, image dynamic range module 46, imaging consistency module 47, artifact and spread function imaging module 48, imaging linearity module 49, imaging capability module 50, imaging distance module 51, low contrast test module 52, bar high contrast test module 53, fan high contrast test module 54, and imaging adhesion test module 55 are connected in sequence.

[0110] The two high-contrast test modules respectively adopted spatial discontinuity (e.g. Figure 11-2 Resolution testing and spatial continuity (e.g.) Figure 11-1 The resolution test represents the ability to distinguish the smallest size in an image, indicating that the device has strong imaging capabilities. The high contrast test module is used to test spatial discontinuous resolution and spatial continuous resolution.

[0111] like Figure 12 As shown, the imaging adhesion test module 55 includes a uniformly distributed and equally spaced metal grid 42.

[0112] The imaging adhesion test module 55 is used to test whether there are image artifacts and image regularity in the imaging.

[0113] Example 2

[0114] like Figure 13 and Figure 14 The present invention discloses a method for using a mobile head cone-beam CT performance testing phantom, characterized in that it includes the mobile head cone-beam CT performance testing phantom 7 described in Example 1, and the specific method of use includes the following steps:

[0115] Step S1: Mount the mobile head cone-beam CT performance testing phantom 7 onto the testing vehicle;

[0116] Step S2: The testing vehicle is equipped with a device that can adjust the up, down, left, and right sides of the mobile head cone-beam CT performance testing phantom 7;

[0117] The testing vehicle includes pulleys 17, a vehicle body 16, and an adjustment device. The pulleys 17 are located at the bottom of the vehicle body 16, and the adjustment device is located on the vehicle body 16. The adjustment device includes a bracket 15, an X-axis adjustment device, a Y-axis adjustment device, and a Z-axis adjustment device. The Z-axis adjustment device is located on the bracket 15, the X-axis adjustment device is located on the Z-axis adjustment device, the Y-axis adjustment device is located on the X-axis adjustment device, and the mobile head cone-beam CT performance testing phantom 7 is located on the Y-axis adjustment device.

[0118] The X-axis adjustment device includes an X-axis crank 1, an X-axis connecting plate 2, an X-axis adjusting screw 3, an X-axis guide rod 4, and an X-axis connecting block 5. The X-axis connecting plate 2 is fixed on the Z-axis adjustment device. One end of the X-axis adjusting screw 3 is connected to the X-axis crank 1, and the other end of the X-axis adjusting screw 3 is rotatably fixed on the X-axis connecting plate 2. X-axis guide rods 4 are provided on both sides of the X-axis adjusting screw 3. The X-axis connecting block 5 is fixed on the X-axis adjusting screw 3 and sleeved on the X-axis guide rod 4. The Y-axis adjustment device is fixed on the X-axis connecting block 5.

[0119] The Y-axis adjustment device includes a limit adjustment plate 6, an adjustment component, and a fixing plate 8. The limit adjustment plate 6 is fixed to the X-axis connecting block 5. The fixing plate 8 is rotatably connected to the limit adjustment plate 6 through the adjustment component. The limit adjustment plate 6 covers the top of the fixing plate 8. The other end of the fixing plate 8 is connected to the movable head cone-beam CT performance testing phantom 7.

[0120] The adjustment assembly includes a rotating shaft 9 and an adjusting bolt 10. The plate body of the fixed plate 8 is connected to the plate body of the limit adjustment plate 6 through the rotating shaft 9, and the end of the fixed plate 8 is fixed to the end of the limit adjustment plate 6 through the adjusting bolt 10.

[0121] The Z-axis adjustment device includes a Z-axis crank 11, a Z-axis adjusting screw 12, a Z-axis guide rod 13, and a Z-axis connecting block 14. One end of the Z-axis adjusting screw 12 is connected to the Z-axis crank 11, and the other end of the Z-axis adjusting screw 12 is rotatably fixed on the bracket 15. Z-axis guide rods 13 are provided on both sides of the Z-axis adjusting screw 12. The Z-axis connecting block 14 is provided on the Z-axis adjusting screw 12, and the Z-axis connecting block 14 is sleeved on the Z-axis guide rod 13. An X-axis connecting plate 2 is fixed on the Z-axis connecting block 14.

[0122] Step S3: After positioning, the mobile head cone-beam CT selects the clinical normal beam output mode to image the phantom, and then analyzes the image results of each module to determine whether the various detection indicators of the mobile head cone-beam CT meet the standards.

[0123] The working process of the device that allows the testing vehicle to adjust the up, down, left, and right sides of the mobile head cone-beam CT performance testing phantom 7 is as follows:

[0124] When the vertical position of the mobile head cone-beam CT performance testing phantom 7 needs to be adjusted, the Z-axis crank 11 is manually cranked to adjust the position of the Z-axis connecting block 14, thereby adjusting the vertical position of the mobile head cone-beam CT performance testing phantom 7.

[0125] When the left and right positions of the mobile head cone-beam CT performance testing phantom 7 need to be adjusted, the X-axis crank 1 is manually cranked to adjust the position of the X-axis guide rod 4, thereby adjusting the left and right positions of the mobile head cone-beam CT performance testing phantom 7.

[0126] When the pitch position of the mobile head cone-beam CT performance testing phantom 7 needs to be adjusted, the fixing plate 8 is released by tightening the adjusting bolt 10, and the pitch position of the mobile head cone-beam CT performance testing phantom 7 is adjusted by rotating the fixing plate 8 around the rotating shaft 9.

[0127] After positioning, the mobile head cone-beam CT scanner selects the clinical normal beam output mode to image the phantom, and then analyzes the image results of each module to determine whether the device's various detection indicators meet the standards.

[0128] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A phantom for mobile head cone beam CT performance testing, characterized in that, The imaging uniformity module, the imaging distortion module, the image dynamic range module, the imaging consistency module, the artifact and spread function imaging module, the imaging linearity module, the imaging capability module, the imaging distance module, the low contrast test module, the high contrast test module and the imaging adhesion test module are detachably connected; The imaging uniformity module is used for measuring the uniform distribution of the mobile head cone beam CT image; The imaging distortion module is used for measuring the radiation distortion error and the geometric distortion error of the mobile head cone beam CT image; The image dynamic range module is used for measuring the image dynamic range of the mobile head cone beam CT image and the accuracy of the axial imaging; The imaging consistency module is used for measuring the deviation and deformation error of the mobile head cone beam CT image in different regions; The artifact and spread function imaging module is used for measuring the mobile head cone beam CT artifact and image spread function caused by different metals; The imaging linearity module is used for measuring the linearity and contrast noise ratio of the mobile head cone beam CT imaging; The imaging capability module is used for testing the contrast imaging capability of the mobile head cone beam CT; The imaging distance module is used for testing the error of the mobile head cone beam CT system distance; The low contrast test module is used for testing the low contrast resolution of the mobile head cone beam CT imaging; The high contrast test module is used for testing the spatial discontinuous resolution and the spatial continuous resolution; The imaging adhesion test module is used for testing whether there is image artifact and image regularity in the imaging; The artifact and spread function imaging module comprises a first small module, a second small module, a third small module, a fourth small module and a fifth small module; The first small module comprises two half circle modules, the half circle modules are spliced into a circular shape, and the materials of the half circle modules are organic glass and polytetrafluoroethylene; The second small module comprises organic glass with a plurality of titanium inserts; The third small module comprises organic glass with a plurality of lead inserts; The fourth small module comprises organic glass with a cavity in the center, and a metal wire is suspended at the center position of the cavity; The fifth small module is organic glass.

2. The mobile head cone beam CT performance detection phantom according to claim 1, characterized in that, The imaging uniformity module comprises a shell, a cavity is arranged in the shell, the cavity is filled with pure water, and the shell is made of transparent plastic material.

3. The mobile head cone beam CT performance detection phantom of claim 1, wherein, The imaging distortion module comprises a plurality of square grooves, the square grooves are alternately arranged to form a square, the substances placed in the square grooves have different densities, and the substances with large density and the substances with small density are alternately arranged.

4. The mobile head cone beam CT performance detection phantom of claim 1, wherein, The image dynamic range module comprises a first substrate and a plurality of steps, the first substrate is provided with a plurality of steps, the thickness of adjacent steps gradually increases, the material of the first substrate is organic glass, and the material of the steps is copper.

5. The mobile head cone beam CT performance test phantom of claim 1, wherein, The imaging consistency module comprises a second substrate, a first scale mark, a second scale mark, a third scale mark and a fourth scale mark, the first scale mark, the second scale mark, the third scale mark and the fourth scale mark form four equal parts on the surface of the second substrate, and a plurality of circular modules are arranged in each part.

6. The mobile head cone beam CT performance detection phantom of claim 1, wherein, The imaging linearity module comprises a plurality of circular regions, and the material density of the center of each circular region is different.

7. The mobile head cone beam CT performance detection phantom of claim 1, wherein, The imaging capability module comprises a plurality of material placement regions, the material density of each material placement region is different, and each material in the material placement region has a plurality of sizes.

8. The mobile head cone beam CT performance detection phantom of claim 1, wherein, The imaging distance module comprises a plurality of imaging points arranged in a square.

9. The mobile head cone beam CT performance detection phantom of claim 1, wherein, The low-contrast test module comprises a third substrate and a plug-in, the third substrate is provided with a plug-in of different materials, and the CT contrast of the material of the plug-in and the material of the third substrate is 1%.

10. The mobile head cone beam CT performance detection phantom of claim 1, wherein, The high-contrast test module comprises a strip-shaped high-contrast test module and a fan-shaped high-contrast test module, and the imaging uniformity module, the imaging distortion module, the image dynamic range module, the imaging consistency module, the artifact and extension function imaging module, the imaging linearity module, the imaging capability module, the imaging distance module, the low-contrast test module, the strip-shaped high-contrast test module, the fan-shaped high-contrast test module and the imaging adhesion test module are sequentially connected.

11. The mobile head cone beam CT performance detection phantom of claim 1, wherein, The structure of the imaging adhesion test module comprises a metal grid with uniform distribution and equal spacing.

12. A method of use for a mobile head cone beam CT performance test phantom, characterized in that, The mobile head cone beam CT performance detection phantom comprises a first scale mark, a second scale mark, a third scale mark, a fourth scale mark, a fifth scale mark, a sixth scale mark, a seventh scale mark, an eighth scale mark, a ninth scale mark, a tenth scale mark, an eleventh scale mark, a twelfth scale mark, a thirteenth scale mark, a fourteenth scale mark, a fifteenth scale mark, a sixteenth scale mark, a seventeenth scale mark, an eighteenth scale mark, a nineteenth scale mark, a twentieth scale mark, a twenty-first scale mark, a twenty-second scale mark, a twenty-third scale mark, a twenty-fourth scale mark, a twenty-fifth scale mark, a twenty-sixth scale mark, a twenty-seventh scale mark, a twenty-eighth scale mark, a twenty-ninth scale mark, a thirtieth scale mark, a thirty-first scale mark, a thirty-second scale mark, a thirty-third scale mark, a thirty-fourth scale mark, a thirty-fifth scale mark, a thirty-sixth scale mark, a thirty-seventh scale mark, a thirty-eighth scale mark, a thirty-ninth scale mark, a fortieth scale mark, a forty-first scale mark, a forty-second scale mark, a forty-third scale mark, a forty-fourth scale mark, a forty-fifth scale mark, a forty-sixth scale mark, a forty-seventh scale mark, a forty-eighth scale mark, a forty-ninth scale mark, a fiftieth scale mark, a fifty-first scale mark, a fifty-second scale mark, a fifty-third scale mark, a fifty-fourth scale mark, a fifty-fifth scale mark, a fifty-sixth scale mark, a fifty-seventh scale mark, a fifty-eighth scale mark, a fifty-ninth scale mark, a sixtieth scale mark, a sixty-first scale mark, a sixty-second scale mark, a sixty-third scale mark, a sixty-fourth scale mark, a sixty-fifth scale mark, a sixty-sixth scale mark, a sixty-seventh scale mark, a sixty-eighth scale mark, a sixty-ninth scale mark, a seventieth scale mark, a seventy-first scale mark, a seventy-second scale mark, a seventy-third scale mark, a seventy-fourth scale mark, a seventy-fifth scale mark, a seventy-sixth scale mark, a seventy-seventh scale mark, a seventy-eighth scale mark, a seventy-ninth scale mark, an eightieth scale mark, an eighty-first scale mark, an eighty-second scale mark, an eighty-third scale mark, an eighty-fourth scale mark, an eighty-fifth scale mark, an eighty-sixth scale mark, an eighty-seventh scale mark, an eighty-eighth scale mark, an eighty-ninth scale mark, a ninetieth scale mark, a ninety-first scale mark, a ninety-second scale mark, a ninety-third scale mark, a ninety-fourth scale mark, a ninety-fifth scale mark, a ninety-sixth scale mark, a ninety-seventh scale mark, a ninety-eighth scale mark, a ninety-ninth scale mark, a one hundredth scale mark, a one hundred and first scale mark, a one hundred and second scale mark, a one hundred and third scale mark, a one hundred and fourth scale mark, a one hundred and fifth scale mark, a one hundred and sixth scale mark, a one hundred and seventh scale mark, a one hundred and eighth scale mark, a one hundred and ninth scale mark, a one hundred and tenth scale mark, a one hundred and eleventh scale mark, a one hundred and twelfth scale mark, a one hundred and thirteenth scale mark, a one hundred and fourteenth scale mark, a one hundred and fifteenth scale mark, a one hundred and sixteenth scale mark, a one hundred and seventeenth scale mark, a one hundred and eighteenth scale mark, a one hundred and nineteenth scale mark, a one hundred and twentieth scale mark, a one hundred and twenty-first scale mark, a one hundred and twenty-second scale mark, a one hundred and twenty-third scale mark, a one hundred and twenty-fourth scale mark, a one hundred and twenty-fifth scale mark, a one hundred and twenty-sixth scale mark, a one hundred and twenty-seventh scale mark, a one hundred and twenty-eighth scale mark, a one hundred and twenty-ninth scale mark, a one hundred and thirtieth scale mark, a one hundred and thirty-first scale mark, a one hundred and thirty-second scale mark, a one hundred and thirty-third scale mark, a one hundred and thirty-fourth scale mark, a one hundred and thirty-fifth scale mark, a one hundred and thirty-sixth scale mark, a one hundred and thirty-seventh scale mark, a one hundred and thirty-eighth scale mark, a one hundred and thirty-ninth scale mark, a one hundred and fortieth scale mark, a one hundred and forty-first scale mark, a one hundred and forty-second scale mark, a one hundred and forty-third scale mark, a one hundred and forty-fourth scale mark, a one hundred and forty-fifth scale mark, a one hundred and forty-sixth scale mark, a one hundred and forty-seventh scale mark, a one hundred and forty-eighth scale mark, a one hundred and forty-ninth scale mark, a one hundred and fiftieth scale mark, a one hundred and fifty-first scale mark, a one hundred and fifty-second scale mark, a one hundred and fifty-third scale mark, a one hundred and fifty-fourth scale mark, a one hundred and fifty-fifth scale mark, a one hundred and fifty-sixth scale mark, a one hundred and fifty-seventh scale mark, a one hundred and fifty-eighth scale mark, a one hundred and fifty-ninth scale mark, a one hundred and sixtieth scale mark, a one hundred and sixty-first scale mark, a one hundred and sixty-second scale mark, a one hundred and sixty-third scale mark, a one hundred and sixty-fourth scale mark, a one hundred and sixty-fifth scale mark, a one hundred and sixty-sixth scale mark, a one hundred and sixty-seventh scale mark, a one hundred and sixty-eighth scale mark, a one hundred and sixty-ninth scale mark, a one hundred and seventieth scale mark, a one hundred and seventy-first scale mark, a one hundred and seventy-second scale mark, a one hundred and seventy-third scale mark, a one hundred and seventy-fourth scale mark, a one hundred and seventy-fifth scale mark, a one hundred and seventy-sixth scale mark, a one hundred and seventy-seventh scale mark, a one hundred and seventy-eighth scale mark, a one hundred and seventy-ninth scale mark, a one hundred and eightieth scale mark, a one hundred and eighty-first scale mark, a one hundred and eighty-second scale mark, a one hundred and eighty-third scale mark, a one hundred and eighty-fourth scale mark, a one hundred and eighty-fifth scale mark, a one hundred and eighty-sixth scale mark, a one hundred and eighty-seventh scale mark, a one hundred and eighty-eighth scale mark, a one hundred and eighty-ninth scale mark, a one hundred and ninetieth scale mark, a one hundred and ninety-first scale mark, a one hundred and ninety-second scale mark, a one hundred and ninety-third scale mark, a one hundred and ninety-fourth scale mark, a one hundred and ninety-fifth scale mark, a one hundred and ninety-sixth scale mark, a one hundred and ninety-seventh scale mark, a one hundred and ninety-eighth scale mark, a one hundred and ninety-ninth scale mark, a two hundredth scale mark, a two hundred and first scale mark, a two hundred and second scale mark, a two hundred and third scale mark, a two hundred and fourth scale mark, a two hundred and fifth scale mark, a two hundred and sixth scale mark, a two hundred and seventh scale mark, a two hundred and eighth scale mark, a two hundred and ninth scale mark, a two hundred and tenth scale mark, a two hundred and eleventh scale mark, a two hundred and twelfth scale mark, a two hundred and thirteenth scale mark, a two hundred and fourteenth scale mark, a two hundred ​ ​ ​ ​ 13. The use of a mobile head cone beam CT performance test phantom according to claim 12, characterized in that, The X-direction adjusting device comprises an X-direction handle, an X-direction connecting plate, an X-direction adjusting screw rod, X-direction guide rods and an X-direction connecting block, the X-direction connecting plate is fixed on the Z-direction adjusting device, one end of the X-direction adjusting screw rod is connected with the X-direction handle, the other end of the X-direction adjusting screw rod is rotationally fixed on the X-direction connecting plate, the X-direction guide rods are arranged on both sides of the X-direction adjusting screw rod, the X-direction connecting block is fixed on the X-direction adjusting screw rod and sleeved on the X-direction guide rods, and the Y-direction adjusting device is fixed on the X-direction connecting block.

14. The use of a mobile head cone beam CT performance test phantom according to claim 13, characterized in that, The Y-direction adjusting device comprises a limiting adjusting plate, an adjusting assembly and a fixed plate, the limiting adjusting plate is fixed with the X-direction connecting block, the fixed plate is rotationally connected with the limiting adjusting plate through the adjusting assembly, the limiting adjusting plate covers the fixed plate, and the other end of the fixed plate is connected with the mobile head cone beam CT performance detection phantom.

15. The use of a mobile head cone beam CT performance test phantom according to claim 14, characterized in that, The adjusting assembly comprises a rotating shaft and an adjusting bolt, the plate body of the fixed plate is connected with the plate body of the limiting adjusting plate through the rotating shaft, and the end of the fixed plate is fixed with the end of the limiting adjusting plate through the adjusting bolt.

16. The use of a mobile head cone beam CT performance test phantom according to claim 15, characterized in that, The Z-direction adjusting device comprises a Z-direction handle, a Z-direction adjusting screw rod, Z-direction guide rods and a Z-direction connecting block, one end of the Z-direction adjusting screw rod is connected with the Z-direction handle, the other end of the Z-direction adjusting screw rod is rotationally fixed on the support, the Z-direction guide rods are arranged on both sides of the Z-direction adjusting screw rod, the Z-direction connecting block is arranged on the Z-direction adjusting screw rod and sleeved on the Z-direction guide rods, and the X-direction connecting plate is fixed on the Z-direction connecting block.

Images