MRI (Magnetic Resonance Imaging) phantom for simulating focus

Abstract

The utility model provides an MRI (Magnetic Resonance Imaging) phantom for simulating a focus, and mainly relates to the technical field of medical instruments. The MRI phantom simulating the focus comprises an L-shaped base, and a piezoelectric driving assembly, a focus simulation assembly and a fixing assembly are fixedly installed on the top face of the L-shaped base; wherein the piezoelectric driving assembly comprises a mounting seat, piezoelectric ceramics, an elastic beam, a transmission plate, a flexible hinge and a turntable; the focus simulation assembly is installed on the top surface of the rotating disc through a fixing assembly. According to the utility model, simulation of syringomyelia and spinal cord tumor of the cervical vertebra can be realized, phantom simulation of diseases is realized, and powerful support can be provided for medical student teaching, disease image segmentation and radiomics.

Description

TECHNICAL FIELD

[0001] The utility model mainly relates to the medical instrument technical field, concretely is a kind of MRI phantom of simulating focus. BACKGROUND

[0002] Magnetic resonance imaging (magnetic resonance imaging, MRI) full name is nuclear magnetic resonance imaging technology (Nuclear Magnetic Resonance Imaging, NMRI) also called spin imaging (spin imaging). Using the nuclear magnetic resonance phenomenon of certain atomic nucleus in human tissue, the obtained radio frequency signal is processed by electronic computer, and the image of a certain layer of human body is reconstructed. Its basic principle is to place the human body in a special magnetic field, excite the hydrogen atomic nucleus in the human body with radio frequency pulse, cause hydrogen atomic nucleus resonance, and absorb energy. After stopping radio frequency pulse, hydrogen atomic nucleus emits radio signal at a certain frequency, and releases absorbed energy, which is collected by receiver outside the body, and image is obtained by electronic computer processing. The information provided by MRI is not only greater than that of many imaging techniques in medical imaging, but also different from existing imaging techniques, so it has great potential superiority for disease diagnosis. It can directly make cross-sectional, sagittal, coronal and various oblique body layer images, and does not produce false image in CT detection. It does not need to inject contrast agent, and has no ionizing radiation and adverse effects on the body. MRI is very effective for detecting intracranial hematoma, extracranial hematoma, brain tumor, intracranial aneurysm, arteriovenous malformation, brain ischemia, intraspinal tumor, spinal cord cavity and hydrocephalus. It is also very effective for the diagnosis of diseases such as lumbar intervertebral disc posterior protrusion and primary liver cancer.

[0003] MRI phantom is an essential tool for evaluating imaging performance, which has wide application and can be used for calibrating and checking imaging equipment, testing new system and pulse sequence development, and training MRI operators. After the research of imaging sequence is verified in simulation, it usually needs to be tested on healthy volunteers first, and then verified by a few patient experiments, and finally widely promoted in clinic. But due to the lack of pathological area in healthy volunteers, the ability to verify the effectiveness of the method is insufficient, and the clinical research of a small number of patients is limited by the repeatability of experiment. Phantom experiment can be used as a supplement to healthy human experiment, at this time, bionic phantom can be used for experiment.

[0004] At present, the development of bionic phantom at home and abroad is not perfect, and the specific use of bionic phantom is not clear. CONTENT OF UTILITY MODEL

[0005] The utility model provides a kind of MRI phantom of simulated lesion, which uses piezoelectric drive without magnetism, and detailed reduction of human skeleton, realizes the visualization of spinal cord disease, the visualization of development stage, and realizes the movable and conversion in phantom shooting process.

[0006] To achieve the above object, the utility model discloses the following technical scheme:

[0007] A kind of MRI phantom of simulated lesion, including L-shaped base, piezoelectric drive assembly, lesion simulation assembly and fixed component are fixedly installed on the top surface of the L-shaped base;

[0008] The piezoelectric drive assembly includes:

[0009] Mounting seat, one side of the top surface of the L-shaped base is fixedly installed with mounting seat;

[0010] Piezoelectric ceramic, a rectangular slot is formed in the top surface of the mounting seat, and piezoelectric ceramic is fixedly installed in the rectangular slot;

[0011] Elastic beam, elastic beam is fixedly installed on one side of the inner wall of the rectangular slot, and one end of the elastic beam abuts against the piezoelectric ceramic;

[0012] Transmission plate, transmission plate is fixedly arranged on the end of the mounting seat away from the elastic beam;

[0013] Flexible hinge, the other end of the piezoelectric ceramic is connected with the inner side of the transmission plate through the flexible hinge;

[0014] Turntable, a needle bearing is arranged on the top surface of the L-shaped base, and a turntable is fixedly installed on the outer side of the needle bearing, and the outer side of the transmission plate abuts against the outer periphery of the turntable and is tangentially arranged with the outer periphery;

[0015] The lesion simulation assembly is installed on the top surface of the turntable through the fixed component.

[0016] Further, the lesion simulation assembly includes several bionic human cervical vertebrae, the several bionic human cervical vertebrae are sequentially hingedly connected from top to bottom, and a simulated spinal cord is arranged in the center of all the bionic human cervical vertebrae, wherein a simulated lesion is arranged on one of the bionic human cervical vertebrae, and the turntable is provided with a gap to install the bionic human cervical vertebrae on the top surface of the turntable.

[0017] Further, the fixed component includes:

[0018] The pad is fixedly installed on one side of the top surface of the L-shaped base, the mounting seat is fixedly installed on the top surface of the pad, a through hole is formed in the center of the top surface of the L-shaped base, a rotating shaft is fixedly installed in the through hole, and the needle bearing is rotatably installed on the rotating shaft.

[0019] A fixed platform is fixedly installed on one side of the vertical plate of the L-shaped base, and is used for fixing the bionic human cervical vertebrae, and the bionic human cervical vertebrae is arranged in contact with the fixed platform.

[0020] Compared with the prior art, the utility model has the beneficial effects that:

[0021] 1. Lesion display: the utility model can realize simulation of a spinal cord cavity and a spinal cord tumor of a cervical vertebra, realize disease phantom simulation, and can provide strong support for medical student teaching, disease image segmentation, and imageomics, solve the problem that a traditional phantom is only used for quality control and image calibration of an imaging device, and can effectively prevent patient privacy leakage in a research process, and if such disease image data is needed, the phantom can be directly scanned to obtain.

[0022] 2. Single structure and multi-stage display: the utility model can realize display of different stages of a spinal cord cavity and a spinal cord tumor of a cervical vertebra, and through rotation of a rotating disc, different stages of a spinal cord cavity and tumor size can be presented at a lesion display position, and the problem that a single phantom cannot change a disease development condition is solved.

[0023] 3. Non-magnetic and used for magnetic resonance imaging: the utility model adopts a piezoelectric driving device without magnetism to realize rotation of the rotating disc, not only can realize manual replacement of the phantom, but also provides a new idea for magnetic resonance dynamic phantoms, and solves the problem that a traditional motor drive cannot be used for magnetic resonance imaging.

[0024] According to the above, the utility model can provide lesion simulation, lesion stage conversion, and a non-magnetic magnetic resonance dynamic pathological simulation phantom. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is a structural schematic view of the utility model;

[0026] Figure 2 is a structural schematic view of a driving device of the utility model;

[0027] Figure 3 is a partial structural schematic view of a lesion simulation assembly of the utility model;

[0028] Figure 4 is a structural schematic view of a fixed assembly of the utility model;

[0029] Figure 5 is a partial structural schematic view of a piezoelectric driving assembly of the utility model.

[0030] The following are the reference numerals in the attached diagram: 10, piezoelectric drive assembly; 101, mounting base; 102, piezoelectric ceramic; 103, elastic beam; 104, transmission plate; 105, flexible hinge; 106, turntable; 107, needle roller bearing; 20, lesion simulation assembly; 201, biomimetic human cervical vertebra; 202, simulated spinal cord; 203, simulated lesion; 204, gap; 30, fixing assembly; 301, pad; 302, through hole; 303, fixing platform; 40, L-shaped base. Detailed Implementation

[0031] The present invention will be further described in conjunction with the accompanying drawings and specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the present invention, and these equivalent forms also fall within the scope defined in this application.

[0032] Example: An MRI phantom simulating a lesion

[0033] like Figures 1-2 As shown, an MRI phantom simulating a lesion has the following specific structure:

[0034] L-shaped base 40, on the top surface of which a piezoelectric drive assembly 10, a lesion simulation assembly 20 and a fixing assembly 30 are fixedly installed;

[0035] The piezoelectric drive assembly 10 includes: a mounting base 101, which is fixedly mounted on one side of the top surface of the L-shaped base 40; a piezoelectric ceramic 102, in which a rectangular groove is formed on the top surface of the mounting base 101 and the piezoelectric ceramic 102 is fixedly mounted; an elastic beam 103, which is fixedly mounted on one side of the inner wall of the rectangular groove and abuts against one end of the piezoelectric ceramic 102; and a transmission plate 104, which is fixed at the end of the mounting base 101 away from the elastic beam 103. The system includes a transmission plate 104; a flexible hinge 105, through which the other end of the piezoelectric ceramic 102 is connected to the inner side of the transmission plate 104; a turntable 106, on which a needle roller bearing 107 is provided on the top surface of the L-shaped base 40, and the turntable 106 is fixedly installed on the outer side of the needle roller bearing 107; the outer side of the transmission plate 104 abuts against and is tangential to the outer periphery of the turntable 106; and the lesion simulation component 20 is installed on the top surface of the turntable 106 through a fixing component 30, with gaps provided on the turntable.

[0036] The working principle is as follows: the piezoelectric ceramic 102 is electrically connected with the power supply. When the structure is used, a voltage is applied at both ends of the piezoelectric ceramic 102, so that the piezoelectric ceramic 102 deforms under the action of a high-frequency electric field. Then, the piezoelectric ceramic 102 drives the transmission plate 104 to swing through the flexible hinge 105 by using the lever principle, so that the end of the transmission plate 104 pushes the rotating disc 106 to rotate by means of friction. The elastic beam 103 plays a buffering effect and can offset the force in the resetting process of the piezoelectric ceramic 102, thereby improving the stability of the device.

[0037] The lesion simulation assembly 20 comprises a plurality of artificial human cervical vertebrae 201, the artificial human cervical vertebrae 201 are sequentially hingedly connected from top to bottom, and a simulation spinal cord 202 is arranged at the center of all the artificial human cervical vertebrae 201. One of the artificial human cervical vertebrae 201 is provided with a simulation lesion 203, and is mounted on the top surface of the rotating disc 106.

[0038] The fixing assembly 30 comprises a backing plate 301, the backing plate 301 is fixedly installed on one side of the top surface of the L-shaped base 40, a mounting seat 101 is fixedly installed on the top surface of the backing plate 301, a through hole 302 is formed in the center of the top surface of the L-shaped base 40, a rotating shaft is fixedly installed in the through hole 302, and the needle roller bearing 107 is rotatably installed on the rotating shaft; a fixed table 303 is fixedly installed on one side of the vertical plate of the L-shaped base 40, the fixed table 303 is used for fixing the artificial human cervical vertebrae 201, and the artificial human cervical vertebrae 201 are arranged to be tangent to the fixed table 303.

[0039] The rotating disc 106 is provided with three sets of the artificial human cervical vertebrae 201, the artificial human cervical vertebrae 201 are made of a gypsum mixture, are respectively cervical three, cervical four and cervical five, and the spinal cord simulation material composed of agarose, gadolinium-based contrast agent, sodium fluoride and distilled water is filled in the vertebral foramen of each set of the artificial human cervical vertebrae 201. The concentration of the gray matter component is respectively 1.5% agarose, 1.8% sodium fluoride and 0.008% gadolinium-based contrast agent, and the concentration of the white matter component is respectively 1.6% agarose, 1.4% sodium fluoride and 0.015% gadolinium-based contrast agent.

[0040] All the components of the piezoelectric driving assembly 10 are made of copper;

[0041] The imaging part comprises a cylindrical shell made of an acrylic plate, and the inside of the cylindrical shell is attached with artificial human cervical vertebrae 201 from top to bottom, which are respectively cervical one, cervical six and cervical seven, and are tangent to cervical three, cervical four and cervical five in the rotating disc 106 of the piezoelectric driving assembly 10.

[0042] In the interpretation of the present application, it should be pointed out that the terms and names indicating the direction are only for the convenience of description and understanding, and are not the only limitation on the installation position of the specific technical features, and other installation methods that can be achieved are not excluded.

[0043] Finally, it should be pointed out that: the above examples are only used to illustrate the technical solutions of the present application, and are not limited thereto; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. An MRI phantom simulating a lesion, characterized in that: The L-shaped base (40) is provided with a piezoelectric driving assembly (10), a lesion simulation assembly (20) and a fixing assembly (30) fixedly installed on the top surface of the L-shaped base (40); The piezoelectric driving assembly (10) comprises: The mounting seat (101) is fixedly installed on one side of the top surface of the L-shaped base (40); The piezoelectric ceramic (102) is fixedly installed in the rectangular slot of the top surface of the mounting seat (101); The elastic beam (103) is fixedly installed on one side of the inner wall of the rectangular slot, and one end of the elastic beam (103) abuts against the piezoelectric ceramic (102); The transmission plate (104) is fixedly installed on the end of the mounting seat (101) away from the elastic beam (103); The flexible hinge (105) is transmissionally connected between the other end of the piezoelectric ceramic (102) and the inner side of the transmission plate (104); The turntable (106) is fixedly installed on the outer side of the needle roller bearing (107) provided on the top surface of the L-shaped base (40), and the outer side of the transmission plate (104) abuts against and is tangentially arranged on the outer periphery of the turntable (106); The lesion simulation assembly (20) is installed on the top surface of the turntable (106) through the fixing assembly (30).

2. The MRI phantom simulating a lesion according to claim 1, characterized in that: The lesion simulation assembly (20) comprises a plurality of bionic human cervical vertebrae (201), the bionic human cervical vertebrae (201) are sequentially hingedly connected from top to bottom, the bionic human cervical vertebrae (201) are provided with a simulated spinal cord (202) penetrating through the centers of all the bionic human cervical vertebrae (201), one of the bionic human cervical vertebrae (201) is provided with a simulated lesion (203), and the turntable (106) is provided with a gap (204) for installing the bionic human cervical vertebrae (201) below on the top surface of the turntable (106).

3. The MRI phantom simulating a lesion according to claim 1, characterized in that: The fixing assembly (30) comprises: The mounting seat (101) is fixedly installed on one side of the top surface of the L-shaped base (40), the mounting seat (101) is fixedly installed on the top surface of the mounting seat (101), a through hole (302) is formed in the center of the top surface of the L-shaped base (40), a rotating shaft is fixedly installed in the through hole (302), and the needle roller bearing (107) is rotationally installed on the rotating shaft; The fixing table (303) is fixedly installed on one side of the vertical plate of the L-shaped base (40), and the fixing table (303) is used for fixing the bionic human cervical vertebrae (201) and is tangentially arranged with the bionic human cervical vertebrae (201).

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