Novel water model for magnetic resonance imaging quality evaluation

Abstract

The utility model discloses a novel water mold for magnetic resonance imaging quality evaluation, which belongs to the technical field of magnetic resonance imaging system testing equipment and comprises a cube-shaped shell made of non-magnetic transparent materials, a plurality of fixing holes are arranged on the surface of the shell, a water mold cavity is formed inside the shell, and a water injection hole is arranged on the shell. The three positioning shafts are fixed in the water mold cavity and intersect at the center of the shell; the plurality of single bodies are fixed in the water mold cavity and are plate-shaped and / or wedge-shaped; according to the utility model, the position of the water model can be accurately positioned through the three positioning shafts and the intersection points thereof, so that the quality evaluation and quantitative analysis of magnetic resonance images are facilitated; through the fixing holes, a plurality of shells can be combined and fixed, water molds required by different test items can be combined together while the magnetic resonance imaging quality evaluation requirements of different apertures are met, the water molds do not need to be placed for multiple times during testing, the burden of workers is reduced, and meanwhile, the influence caused by position changes is removed.

Description

Technical Field

[0001] The utility model relates to the technical field of magnetic resonance imaging system testing equipment, in particular to a novel water phantom for magnetic resonance imaging quality assessment. Background Art

[0002] Magnetic Resonance Imaging (MRI) uses the principle of nuclear magnetic resonance. Based on the different attenuation of released energy in different structural environments within matter, the emitted electromagnetic waves are detected by applying an external gradient magnetic field. The position and type of atomic nuclei that make up an object can be determined, and a structural image of the object's interior can be drawn based on this information. It uses static magnetic fields and radio frequency magnetic fields to image human tissue. During the imaging process, clear images with high contrast can be obtained without the use of electron ionizing radiation or contrast agents. It can reflect abnormalities and early lesions of human organs from within human molecules. It is superior to X-ray CT in many aspects. Based on safety and imaging value, the magnetic resonance imaging system is the safest clinical imaging method with the clearest anatomical contrast.

[0003] Water phantoms serve as important experimental tools for evaluating various imaging quality indicators, such as signal-to-noise ratio (SNR), uniformity, and resolution, during functional magnetic resonance imaging (fMRI) quality control. With the gradual expansion of domestic MRI equipment manufacturers in terms of scale and technical sophistication, the widespread adoption of MRI equipment in domestic medical institutions, and the continuous advancement of MRI technology, new imaging methods and techniques are emerging, leading to an increasingly urgent need for quantitative evaluation capabilities in MRI equipment. MRI engineers and technicians often use water phantoms for periodic testing and preventive maintenance. Currently, commonly used water phantoms are typically provided by MRI manufacturers and are typically spherical or cylindrical, with a single concentration and homogeneous consistency. These phantoms are difficult to position, requiring specialized auxiliary tooling for precise placement. Changes to the slice plane require repositioning the phantom. Furthermore, existing water phantoms lack central positioning and can only assess slice thickness and determine spatial resolution, but are unable to evaluate other parameters, such as SNR and uniformity. Furthermore, existing water phantoms are relatively fixed in size and position, adapting to only one type of magnet, increasing design and production costs.

[0004] Therefore, developing and designing a new water model that can evaluate magnetic resonance equipment with different field strengths, sizes, locations, and functions is an urgent problem to be solved at this stage. Utility Model Content

[0005] The utility model provides a new type water mould for magnetic resonance imaging quality evaluation, through three positioning shafts and its intersection point can accurately position the position of water mould, the quality evaluation and quantitative analysis of convenient magnetic resonance image, and, through the fixed hole on the surface of shell can conveniently realize the combination fixation of multiple shell bodies, satisfy the magnetic resonance imaging quality evaluation demand of different aperture, still can combine water mould of different test project demand together, do not need to place water mould for many times when testing, reduce the burden of staff still removes the influence of position change, can conveniently accurately evaluate different field intensity, different size, different part, different function's magnetic resonance equipment.

[0006] In order to realize above-mentioned purpose, the utility model adopts technical scheme as follows:

[0007] The utility model provides a new type water mould for magnetic resonance imaging quality evaluation, including:

[0008] Shell, the material quality of shell is non -magnetic transparent material, the shell is square, every surface of shell is equipped with a plurality of fixed holes, the water mould cavity is formed in the shell, and the shell has the water injection hole that communicates with the water mould cavity on it;

[0009] Three positioning shafts, the positioning shaft is fixed in the water mould cavity, and the axis of the three positioning shafts is collinear with the three axes of the shell respectively, and the three positioning shafts intersect at the center of the shell.

[0010] A plurality of monomers, the monomer is fixed in the water mould cavity, and a plurality of monomers are plate-shaped and / or inclined wedge-shaped.

[0011] As a preferred technical scheme, a plurality of monomers are plate-shaped, and a plurality of monomers are provided as multiple groups, and the monomers belonging to the same group are arranged in parallel.

[0012] As a preferred technical scheme, the thickness of the monomers belonging to the same group is 0.5cm, the length is 5cm, and the width is 2.5cm, and the interval between adjacent monomers is 1mm.

[0013] And / or, the thickness of the monomers belonging to the same group is 1cm, the length is 5cm, and the width is 2.5cm, and the interval between adjacent monomers is 2mm.

[0014] And / or, the number of monomers belonging to the same group is 10.

[0015] As a preferred technical scheme, a plurality of monomers are inclined wedge-shaped, and two monomers form a group.

[0016] As a preferred technical scheme, the inclined surfaces of two monomers belonging to the same group are arranged in parallel and the interval is 1mm.

[0017] And / or, the inclined surfaces of the monomers belonging to the same group are staggered.

[0018] And / or, the length of the monomer is 50mm, the width is 10mm, and the height is 10mm.

[0019] As a preferred technical scheme, the shell is provided in plurality, and a connecting assembly is arranged between adjacent shells, the connecting assembly comprises a connecting shaft and a fixing pin, the shapes of both ends of the connecting shaft are matched with the fixing hole, and both ends of the fixing pin are provided with a fixing protrusion matched with the fixing hole.

[0020] As a preferred technical scheme, the shape of the water mold cavity is provided as a cube, a sphere or a cylinder.

[0021] And / or, the water mold cavity is filled with a solution.

[0022] As a preferred technical scheme, the water injection hole is provided as a threaded hole, and a plugging bolt matched with the threaded hole is arranged on the threaded hole.

[0023] As a preferred technical scheme, the diameter of the fixing hole is 2-4mm, and the depth is 2-4mm.

[0024] As a preferred technical scheme, the material of the shell is provided as organic glass.

[0025] The beneficial effects of the utility model are as follows:

[0026] The utility model discloses a three positioning shafts and the intersection point thereof can accurately position the position of the water mold in the magnet, and the quality evaluation and quantitative analysis of the magnetic resonance image are facilitated. Moreover, the fixing hole on the surface of the shell can conveniently realize the combination and fixation of multiple shells, meets the magnetic resonance imaging quality evaluation demand of different hole diameters, and also can combine the water molds of different test project demands together. When testing, the water mold does not need to be placed for multiple times, the influence of position change is removed, and the magnetic resonance equipment of different field strengths, different sizes, different parts and different functions can be conveniently and accurately evaluated. ACCURACY

[0027] Figure 1 It is the structure diagram of the shell and the positioning shaft in the first embodiment of the utility model for magnetic resonance imaging quality evaluation novel water mold.

[0028] Figure 2 It is the structure diagram of the shell in the first embodiment of the utility model for magnetic resonance imaging quality evaluation novel water mold. Figure 1 ​

[0029] Figure 3 is a surface view of Figure 2 ;

[0030] Figure 4 is a structural schematic view of the blocking bolt in Figure 1 ;

[0031] Figure 5 is a structural schematic view of the multiple housings after being connected in Figure 1 ;

[0032] Figure 6 is a structural schematic view of the connecting shaft in Figure 5 ;

[0033] Figure 7 is a structural schematic view of the fixing pin in Figure 5 ;

[0034] Figure 8 is a structural schematic view of the housing and the single body in the first embodiment of the novel water phantom for magnetic resonance imaging quality evaluation;

[0035] Figure 9 is a structural schematic view of the second embodiment of the novel water phantom for magnetic resonance imaging quality evaluation;

[0036] Figure 10 is a structural schematic view of the third embodiment of the novel water phantom for magnetic resonance imaging quality evaluation;

[0037] Figure 11 is a cooperation schematic view between the single bodies belonging to the same group in Figure 10 .

[0038] In the figure: 1-housing, 11-fixing hole, 12-water phantom cavity, 13-water injection hole, 2-positioning shaft, 3-single body, 4-blocking bolt, 5-connecting shaft, 6-fixing pin, 61-fixing protrusion. DETAILED DESCRIPTION

[0039] In order to facilitate the understanding of those skilled in the art, the present utility model will be further described below in combination with the drawings.

[0040] Example one

[0041] Please refer to Figures 1-8The utility model provides a kind of embodiment for the new water phantom for magnetic resonance imaging quality evaluation, including the shell 1 of non-magnetic transparent material, shell 1 is square, each surface is equipped with several fixed holes 11, fixed hole 11 is blind hole, multiple shell 1 can be connected and fixed each other by fixed hole 11;Cuboid water phantom cavity 12 is formed in the shell 1, shell 1 has water injection hole 13 with water phantom cavity 12, the solution for imaging of suitable concentration can be filled in water phantom cavity 12 by water injection hole 13, and the solution can be copper sulfate pentahydrate;

[0042] Three positioning shafts 2 are fixed in water phantom cavity 12, the axis of three positioning shafts 2 is respectively collinear with three axes of shell 1, three positioning shafts 2 intersect at the center of shell 1, and the position of water phantom on magnetic resonance image can be accurately positioned by three positioning shafts 2 extending along x, y and z directions respectively and the intersection point, which facilitates the quality evaluation and quantitative analysis of magnetic resonance image.

[0043] A plurality of monomers 3 should also be fixed in water phantom cavity 12, a plurality of monomers 3 are plate-shaped and / or inclined wedge-shaped, a plurality of monomers 3 in plate shape can be used for periodic detection, a plurality of monomers 3 in inclined wedge shape can measure layer thickness by inclined plate method or wedge method, which can evaluate geometric distortion, ghosting and uniformity of magnetic resonance image, and test spatial resolution and layer thickness of magnetic resonance image; A plurality of monomers 3 of the utility model can be combined arbitrarily, which can meet the quality evaluation requirements of magnetic resonance imaging of different apertures, and different monomers 3 required for different test items can be combined together, so that the water phantom does not need to be placed multiple times during testing, which reduces the burden of staff and eliminates the influence of position change, so that the utility model can be used for multiple purposes, which is convenient for testing and saves cost.

[0044] It should be noted that the material of shell 1 is preferably organic glass, which does not generate magnetic resonance signals and facilitates observation of positioning shaft 2 and monomer 3 in water phantom cavity 12.

[0045] In the embodiment, please refer to Figures 5-8 Shell 1 can also be provided in multiple, adjacent shell 1 can be connected and fixed by connecting assembly, specifically, connecting assembly can include connecting shaft 5 and fixed pin 6, the shape of both ends of connecting shaft 5 matches fixed hole 11, both ends of connecting shaft 5 are inserted into fixed hole 11 of two shell 1 respectively; Both ends of fixed pin 6 are provided with fixed protrusion 61 matching fixed hole 11, both fixed protrusions 61 are also inserted into fixed hole 11 of two shell 1 respectively, and adjacent two shell 1 can be connected and fixed by connecting shaft 5 and fixed pin 6.

[0046] Specifically, the diameter of fixed hole 11 is preferably 2-4mm, and the depth is preferably 2-4mm, which is convenient for processing and use.

[0047] In the embodiment, please refer to Figure 8 , the plurality of monomers 3 are all plate-shaped, the plurality of monomers 3 are arranged in multiple groups, and the monomers 3 in the same group are all arranged in parallel, so that periodic detection and preventive maintenance can be performed on the magnetic resonance imaging system.

[0048] Specifically, please refer to Figure 8 , the number of the monomers 3 in the same group is preferably 10; in a specific embodiment, the thickness of the monomers 3 in the same group is 0.5 cm, the length is 5 cm, the width is 2.5 cm, and the interval between adjacent monomers 3 is 1 mm; in another specific embodiment, the thickness of the monomers 3 in the same group is 1 cm, the length is 5 cm, the width is 2.5 cm, and the interval between adjacent monomers 3 is 2 mm, so as to ensure the accuracy of periodic detection.

[0049] In the embodiment, please refer to Figures 1-4 , the water injection hole 13 is preferably a threaded hole, and a plugging bolt 4 matched with the threaded hole is arranged on the threaded hole, so that the water injection hole 13 can be plugged by threaded connection.

[0050] Embodiment two

[0051] Please refer to Figure 9 , the main difference between the embodiment and the embodiment one is that the shape of the water mold cavity 12 is spherical, and the water mold cavity 12 can also be cylindrical in other embodiments, so as to conveniently place the positioning shaft 2 and the monomers 3 and facilitate evaluation of the magnetic resonance equipment.

[0052] Embodiment three

[0053] Please refer to Figure 10 and Figure 11 , the main difference between the embodiment and the embodiment one is that the plurality of monomers 3 are all wedge-shaped, and two monomers 3 form a group; specifically, the length of the monomer 3 is preferably 50 mm, the width is 10 mm, and the height is 10 mm.

[0054] Further, the inclined surfaces of the two monomers 3 in the same group are arranged in parallel and have a spacing of 1 mm, and the directions of the inclined surfaces in the front and rear groups are opposite, for measuring the layer thickness by the inclined plate method; the inclined surfaces of the monomers 3 in the same group are arranged in staggered manner, for measuring the layer thickness by the wedge method.

[0055] The above merely describes preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A novel water phantom for magnetic resonance imaging quality assessment, characterized in that, The utility model relates to a water mold device, including: An outer shell (1), the material quality of outer shell (1) is non-magnetic transparent material, the outer shell (1) is square, a plurality of fixed holes (11) are arranged on each surface of the outer shell (1), a water mold cavity (12) is formed in the outer shell (1), and the outer shell (1) has a water injection hole (13) in communication with the water mold cavity (12); Three positioning shafts (2) are fixed in the water mold cavity (12), the shaft centers of the three positioning shafts (2) are collinear with the three shaft centers of the outer shell (1), and the three positioning shafts (2) intersect at the center of the outer shell (1); A plurality of monomers (3) are fixed in the water mold cavity (12), and the plurality of monomers (3) are plate-shaped and / or wedge-shaped.

2. A new water phantom for magnetic resonance imaging quality assessment as claimed in claim 1, wherein, The plurality of monomers (3) are plate-shaped, and the plurality of monomers (3) are arranged in groups, and the monomers (3) in the same group are arranged in parallel.

3. A novel water phantom for magnetic resonance imaging quality assessment as claimed in claim 2, wherein, The thickness of the monomers (3) in the same group is 0.5cm, the length is 5cm, the width is 2.5cm, and the interval between adjacent monomers (3) is 1mm. The thickness of the monomers (3) in the same group is 1cm, the length is 5cm, the width is 2.5cm, and the interval between adjacent monomers (3) is 2mm. The number of monomers (3) in the same group is 10.

4. A new water phantom for magnetic resonance imaging quality assessment as claimed in claim 1, wherein, The plurality of monomers (3) are wedge-shaped, and two monomers (3) form a group.

5. A novel water phantom for magnetic resonance imaging quality assessment as claimed in claim 4, wherein, The inclined surfaces of the two monomers (3) in the same group are arranged in parallel and have a spacing of 1mm. The inclined surfaces of the monomers (3) in the same group are arranged in a staggered manner. The length of the monomers (3) is 50mm, the width is 10mm, and the height is 10mm.

6. A new water phantom for magnetic resonance imaging quality assessment as claimed in claim 1, wherein, The outer shell (1) is provided with a connecting assembly between adjacent outer shells (1), the connecting assembly includes a connecting shaft (5) and a fixed pin (6), the shapes of the two ends of the connecting shaft (5) are matched with the fixed holes (11), and the two ends of the fixed pin (6) are provided with fixed protrusions (61) matched with the fixed holes (11).

7. A new water phantom for magnetic resonance imaging quality assessment as claimed in claim 1, wherein, The shape of the water mold cavity (12) is a cube, a sphere or a cylinder. The water mold cavity (12) is filled with a solution.

8. A new water phantom for magnetic resonance imaging quality assessment as claimed in claim 1, wherein, The water injection hole (13) is a threaded hole, and a plug bolt (4) matched with the threaded hole is arranged on the threaded hole.

9. A new water phantom for magnetic resonance imaging quality assessment as claimed in claim 1, wherein, The diameter of the fixed hole (11) is 2-4mm, and the depth is 2-4mm.

10. A new water phantom for magnetic resonance imaging quality assessment as claimed in claim 1, wherein, The material of the outer shell (1) is organic glass.

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