Die body for magnetic resonance low-contrast resolution test

Abstract

The utility model relates to the technical field of resonance testing, in particular to a die body for magnetic resonance low-contrast resolution testing, which comprises a shell and a testing main body arranged in the shell. The testing main body comprises a plurality of supporting rings and testing pieces which are sequentially and alternately arranged from bottom to top, and each testing piece is provided with a plurality of testing holes penetrating up and down. And a plurality of groups of test holes with different diameters are formed in the test piece at intervals along the circumferential direction of the test piece. And each group of test holes comprises a plurality of test holes which are sequentially arranged at intervals from inside to outside. The number of the test pieces is four, and the thicknesses of the four test pieces are respectively 0.225 mm, 0.180 mm, 0.125 mm and 0.070 mm. A liquid inlet horizontally penetrating through the inner wall and the outer wall of the supporting ring is formed in the side portion of the supporting ring. The die body for the magnetic resonance low-contrast resolution test has the advantages of being reasonable in structure, easy to machine, high in precision, low in requirement for placement precision of the die body in the test process and the like.

Description

Technical Field

[0001] This utility model relates to the field of magnetic resonance testing technology, and in particular to a phantom for low-contrast resolution magnetic resonance testing. Background Technology

[0002] The People's Republic of China Pharmaceutical Industry Standard (YY / T 1840-2023) has added test conditions to the general technical requirements for medical magnetic resonance imaging (MRI) systems, stipulating that MRI equipment should meet the manufacturer's specified low-contrast resolution requirements. Analogous to CT, the low-contrast resolution test phantom is a test instrument used to verify the grayscale resolution capability of an MRI system.

[0003] In existing technologies, most methods involve milling a certain number of test holes of different depths conforming to the standard (YY / T 1840-2023) on a plate approximately 1 cm thick that has no signal. The plate is then immersed in a solution specified in the standard (YY / T 1840-2023), and scanned using the parameters specified in the standard (YY / T 1840-2023). The number of different bright spots (test holes) appearing in the image is counted. If the number of bright spots is greater than the number of bright spots specified in the standard (YY / T 1840-2023), the low-contrast resolution of the device is considered qualified.

[0004] The disadvantage of the existing technology is that test holes of different depths and sizes are distributed on the same test plate. When processing test holes of different depths and sizes on the same test plate, the processing is relatively complicated and it is not easy to control the processing accuracy, which can easily lead to inaccurate test results. During scanning testing, there are particularly high requirements for the placement accuracy of the model. All test holes must be on the same scanning plane. Otherwise, the number of some test holes will be reduced, resulting in inaccurate test results.

[0005] Therefore, designing a phantom with a reasonable structure, high precision, and low requirements for the placement accuracy of the phantom during testing for low contrast resolution magnetic resonance imaging has become a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0006] The technical problem to be solved by this utility model is to provide a phantom for low contrast resolution magnetic resonance testing, which has the advantages of reasonable structure, easy processing, high precision, and low requirements for the placement accuracy of the phantom during testing.

[0007] To solve the above problems, the technical solution adopted by this utility model is as follows:

[0008] A phantom for low-contrast resolution magnetic resonance testing includes a shell and a test body disposed inside the shell; the test body includes multiple support rings and test pieces arranged alternately from bottom to top, and each test piece is provided with several through test holes.

[0009] As an improvement, the test piece is provided with multiple sets of test holes of different diameters spaced apart along its circumference.

[0010] As an improvement, the test piece is provided with ten sets of test holes of different diameters spaced apart along its circumference. The diameters of the ten sets of test holes are 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 6mm and 7mm respectively.

[0011] As an improvement, each group of test holes includes multiple test holes arranged at intervals from the inside out.

[0012] As an improvement, the number of test pieces is four, and the thicknesses of the four test pieces are 0.225 mm, 0.180 mm, 0.125 mm and 0.070 mm, respectively.

[0013] As an improvement, the side of the support ring is provided with a liquid inlet that runs horizontally through its inner and outer walls.

[0014] As an improvement, the test body is provided with a through hole running vertically through the support ring and the test piece in sequence, and a positioning pin is installed inside the through hole.

[0015] As an improvement, the test body is provided with a through hole running vertically through the support ring and the test piece in sequence; a connector is installed in the through hole; and the test body is fixed to the bottom wall of the shell by the connector.

[0016] As an improvement, the upper end of the housing is provided with a liquid injection port, and a plug is installed inside the liquid injection port.

[0017] As an improvement, the test body is fixed to the bottom of the shell, and gaps are provided between the test body and the inner wall of the shell on its periphery and top.

[0018] The present invention adopts the above technical solution and has the following advantages compared with the prior art:

[0019] This invention relates to a phantom for low-contrast resolution magnetic resonance testing. The test holes are positioned on the test pieces, facilitating manufacturing and ensuring the depth and precision of the test holes. Positioning pins on the main body ensure the consistency of the relative positions of the test holes on the upper and lower four test pieces with the designed positions.

[0020] The test body of this utility model adopts a structure design of four test pieces, with adjacent test pieces separated by a support ring. A liquid inlet is provided on the side of the support ring, which can facilitate the filling of the test body with solution. During filling, the solution is slowly injected into the test body through the liquid inlet, which is not easy to generate air bubbles and can protect the test pieces from deformation due to the liquid pressure of the solution.

[0021] This invention relates to a phantom for low-contrast resolution magnetic resonance imaging (MRI) testing. A single MRI scan can acquire the required number of bright spots for all test aperture sizes and depths. Four test pieces are distributed on different scanning planes, and each test piece can test a set of data. They are independent of each other and do not interfere with each other, making the testing more convenient and accurate.

[0022] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of a phantom used for low-contrast resolution testing of magnetic resonance in Embodiment 1 of this utility model;

[0024] Figure 2 for Figure 1 AA section view in the middle;

[0025] Figure 3 for Figure 1 Schematic diagram of the structure of the central ring;

[0026] Figure 4 for Figure 3 Side view;

[0027] Figure 5 This is a three-dimensional schematic diagram of a ring.

[0028] Figure 6 for Figure 1 Schematic diagram of the structure of the test piece;

[0029] Figure 7 This is a schematic diagram of the structure of a phantom used for low-contrast resolution magnetic resonance testing in Embodiment 2 of this utility model;

[0030] Wherein: 1-shell, 2-test body, 3-injection port, 4-plug, 5-cap, 6-support ring, 7-test piece, 8-test hole, 9-injection port, 10-through hole, 11-positioning pin, 12-connector. Detailed Implementation

[0031] Example 1

[0032] like Figures 1 to 6As shown, a phantom for low-contrast resolution magnetic resonance testing includes a housing 1 with an opening at the top and a test body 2 disposed inside the housing 1.

[0033] The upper end of the shell 1 is provided with a liquid injection port 3, and a plug 4 is installed inside the liquid injection port 3. The shell 1 is cylindrical, cuboid, cube, or other three-dimensional shape. In this example, preferably, the shell 1 is a hollow cylinder, and the upper end of the shell 1 is provided with a cover 5, on which the liquid injection port 3 is located, and the number of liquid injection ports is two.

[0034] The test body 2 is fixed to the bottom of the housing 1, and gaps are provided between the test body 2 and the inner wall of the housing 1 on its periphery and top. In this embodiment, preferably, the test body is adhered to the bottom wall of the inner side of the housing 1.

[0035] The test body 2 includes multiple support rings 6 and test pieces 7 arranged alternately from bottom to top. Each test piece 7 has several through test holes 8. The multiple support rings 6 and multiple test pieces 7 are fixed together. Preferably, in this embodiment, the multiple support rings 6 and multiple test pieces 7 are bonded together with adhesive. The side of the support ring 6 is provided with a liquid inlet 9 that horizontally penetrates its inner and outer walls.

[0036] The test piece 7 is provided with multiple sets of test holes 8 of different diameters arranged at intervals along its circumference; each set of test holes 8 includes multiple test holes 8 arranged at intervals from the inside to the outside.

[0037] The number of support rings 6 and test pieces 7 is the same, and there can be multiple support rings 6 and test pieces 7. In actual applications, the number of support rings 6 and test pieces 7 should be set according to the requirements. In this embodiment, preferably, there are four support rings 6 and four test pieces 7. The thicknesses of the four test pieces 7 are 0.225mm, 0.180mm, 0.125mm, and 0.070mm, respectively. Each test piece 7 is provided with ten sets of test holes 8 of different diameters spaced apart along its circumference. The test holes 8 are circular holes, and the diameters of the ten sets of test holes 8 are 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 6mm, and 7mm, respectively.

[0038] like Figure 2 As shown, the test body 2 has a through hole 10 running vertically through it. The through hole 10 passes through the support ring 6 and the test piece 7 sequentially, and a positioning pin 11 is installed inside the through hole 10. The number of positioning pins 11 can be two, three, four, or more, depending on the requirements. The shape and external dimensions of the support ring 6 and the test piece 7 are adapted to each other. In this embodiment, preferably, the support ring 6 is not annular, and the test piece 7 is circular, with the outer diameter of the test piece 7 being the same as the outer diameter of the support ring 6.

[0039] In this preferred embodiment, four positioning pins 11 are evenly distributed. The support ring 6 is a white transparent acrylic ring, and the test piece 7 is a PC sheet. The support ring 6, the test piece 7, and the four positioning pins 11 are bonded together. The support ring 6 and the test piece 7 are placed in the following order from bottom to top: support ring 6, test piece 7, support ring 6, test piece 7, support ring 6, test piece 7, support ring 6, test piece 7, support ring 6, test piece 7. The four positioning pins 11 pass through the multiple support rings 6 and the multiple test pieces 7 in sequence to ensure the relative position of the test holes 8 on the upper and lower sheets.

[0040] Example 2

[0041] like Figure 7 As shown, the difference between this embodiment and Embodiment 1 is that the test body 2 has a through hole 10 extending vertically, through which the support ring 6 and the test piece 7 pass sequentially. A connector 12 is installed inside the through hole 10; and the test body 2 is fixed to the bottom wall of the housing 1 through the connector 12. The connector 12 is a screw or bolt, etc., and in this embodiment, it is preferably a screw. A screw hole is provided on the bottom wall of the housing 1 corresponding to the position of the screw, and the lower end of the screw is installed in the screw hole; that is, the test body 2 is fixed to the bottom wall of the housing 1 through the screw and the screw hole.

[0042] The present invention provides a phantom for low-contrast resolution testing of magnetic resonance imaging in Embodiments 1 and 2. In use, the shell 1 of the phantom is filled with a solution. The preferred solution is an aqueous solution of 10 mmol / L NiCl2 and 75 mmol / L NaCl as specified in the testing standard YY / T 1840-2023.

[0043] When injecting the solution into the phantom used for low-contrast resolution magnetic resonance testing, the end of the delivery hose is sent to the bottom of the housing 1 through the injection port 3 at the upper end of the housing 1, and the solution is slowly delivered to the bottom of the housing 1 through the delivery hose. The side of the support ring 6 is designed with an inlet 9 to facilitate solution injection. During solution injection, the solution will slowly flow into the interior of the test body 2 from the inlet 9 of the support ring 6, and slowly squeeze out the air inside it. This solves the problem of air bubbles generated inside the test body 2 that cannot be discharged during solution injection, and also avoids the deformation caused by the solution flowing into the test hole of the thin sheet and causing pressure on the thin sheet.

[0044] The present invention provides a phantom for low-contrast resolution testing of magnetic resonance imaging, which has the advantages of reasonable structure, easy processing, high precision, and low requirements for the placement accuracy of the phantom during testing.

[0045] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A phantom for low-contrast resolution testing of magnetic resonance imaging, characterized in that: It includes a housing (1) and a test body (2) disposed inside the housing (1); The test body (2) includes multiple support rings (6) and test pieces (7) arranged alternately from bottom to top, and each test piece (7) is provided with several test holes (8) that run through from top to bottom.

2. The phantom for low-contrast resolution testing of magnetic resonance imaging as described in claim 1, characterized in that: The test piece (7) is provided with multiple sets of test holes (8) of different diameters spaced apart along its circumference.

3. The phantom for low-contrast resolution testing of magnetic resonance imaging as described in claim 2, characterized in that: The test piece (7) is provided with ten sets of test holes (8) of different diameters spaced apart along its circumference. The diameters of the ten sets of test holes (8) are 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 6mm and 7mm respectively.

4. The phantom for low-contrast resolution testing of magnetic resonance imaging as described in claim 2, characterized in that: Each set of test holes (8) includes multiple test holes (8) arranged sequentially from the inside out.

5. The phantom for low-contrast resolution magnetic resonance testing as described in any one of claims 1 to 4, characterized in that: The number of test pieces (7) is four, and the thicknesses of the four test pieces (7) are 0.225mm, 0.180mm, 0.125mm and 0.070mm respectively.

6. The phantom for low-contrast resolution magnetic resonance testing as described in any one of claims 1 to 4, characterized in that: The side of the support ring (6) is provided with a liquid inlet (9) that runs horizontally through its inner and outer walls.

7. The phantom for low-contrast resolution magnetic resonance testing as described in any one of claims 1 to 4, characterized in that: The test body (2) is provided with a through hole (10) that runs vertically through the test body. The through hole (10) passes through the support ring (6) and the test piece (7) in sequence. A positioning pin (11) is installed inside the through hole (10).

8. The phantom for low-contrast resolution magnetic resonance testing as described in any one of claims 1 to 4, characterized in that: The test body (2) is provided with a through hole (10) running vertically through the support ring (6) and the test piece (7) in sequence; a connector (12) is installed in the through hole (10); and the test body (2) is fixed to the bottom wall of the shell (1) through the connector (12).

9. The phantom for low-contrast resolution magnetic resonance testing as described in any one of claims 1 to 4, characterized in that: The upper end of the housing (1) is provided with a liquid injection port (3), and a plug (4) is installed inside the liquid injection port (3).

10. The phantom for low-contrast resolution magnetic resonance testing as described in any one of claims 1 to 4, characterized in that: The test body (2) is fixed to the bottom of the shell (1), and there are gaps between the test body (2) and the inner wall of the shell (1) on the periphery and top.

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