Open type magnetic resonance imaging system

Abstract

The invention provides an open type magnetic resonance imaging system, which belongs to the technical field of imaging equipment, and comprises two magnetic resonance imaging units which are oppositely arranged, have close side surfaces and are arranged at a certain interval, and each magnetic resonance imaging unit comprises a shell and a magnetic resonance imaging magnet arranged in the shell. By optimizing the single magnet design and vector superposition of magnetic lines of force, the magnetic field intensity of a uniform region is remarkably enhanced; after the outer magnetic fields of the two magnets are overlapped in the central imaging area, the bending and dispersion phenomena caused by the edge effect are reduced, the magnetic field intensity in a uniform area is improved, and higher imaging precision and quality are ensured; the outer magnetic fields of the two magnets are combined into a uniform central magnetic field, so that a uniform magnetic field area is obviously enlarged, a larger shimming diameter of an imaging area is provided, and the overall imaging effect is improved; the magnetic field coverage range of the imaging area is larger, and the requirement for the large imaging range can be met.

Description

Technical Field

[0001] The present invention relates to the technical field of imaging equipment, and in particular to an open magnetic resonance imaging system. Background Art

[0002] Magnetic resonance imaging (MRI) technology has developed into an important technology in the field of imaging since the 1970s. MRI uses the magnetic resonance effect of hydrogen nuclei in a strong magnetic field to generate images by emitting and receiving radio frequency pulses, and can provide high-resolution internal structure information. Magnetic resonance technology has shown important value in many fields. In materials science, nuclear magnetic resonance (NMR) is used to study molecular structure and determine the chemical structure and dynamics of molecules; in geophysics, nuclear magnetic resonance logging technology is used for the detection and evaluation of groundwater resources; in industrial testing, magnetic resonance technology is used for non-destructive testing (NDT), such as detecting defects and stress distribution inside materials; in biology and biochemistry, magnetic resonance technology is used to study the structure and function of biological macromolecules. Due to its non-invasive, radiation-free, high-contrast and multi-parameter imaging characteristics, MRI is particularly important in medicine and human body testing. It can provide detailed information on the internal structure of the human body and provide an important basis for clinical diagnosis and treatment. There are two main magnet configurations for existing MRI systems: one is like Figure 1 The closed MRI system shown in the figure uses a large drum-shaped closed superconducting magnet. This type of system has a high magnetic field strength, ranging from 1.5T to 5T, or even higher; imaging is performed through the holes inside the magnet, and the uniform field diameter is generally between 40 and 50 cm, providing conditions for accurate imaging. The other type is as Figure 2 The open MRI system shown in the figure is composed of two magnets with opposite polarities, the ends of the magnets are close to each other, and the interval is a certain distance (50cm to 85cm). This type of system has a low magnetic field strength, but provides a relatively open space, which can not only avoid the problem of claustrophobia of the subject, but also is suitable for clinical applications with high requirements for operating space.

[0003] However, due to the complexity of the geometric structure design and magnetic field line distribution of the existing open MRI system, the imaging area has limitations in magnetic field strength, uniformity and imaging range. Specifically, when the opposite polarity ends of the two magnets of the existing open MRI system are close to each other (i.e., the N pole of one magnet is close to the S pole of the other magnet), the magnetic field lines will be disturbed by the edge effect when passing through the open area between the two magnets (the edge effect refers to the bending and scattering of the magnetic field lines in the edge area of ​​the magnet due to the discontinuity of the magnetic field and the magnetic pole effect, resulting in an uneven distribution of the magnetic field). Figure 3As shown in the figure, the magnetic lines of force are prone to bend at the ends of the two magnets, making the magnetic field strength in the open area between the magnets uneven and gradient-changing. The magnetic field in the center area is weaker, while the magnetic field in the edge area is stronger, making it difficult to achieve the concentration and uniform distribution of the magnetic field in the imaging area. These factors limit the magnetic field strength in the imaging area of ​​existing open MRI systems, which is usually between 0.2T and 0.7T, affecting high-precision imaging. At the same time, the uniform field diameter of the imaging area of ​​existing open MRI systems is about 30cm to 40cm, which limits the ability to image over a large range. Summary of the invention

[0004] The object of the present invention is to provide an open magnetic resonance imaging system to solve at least one technical problem existing in the above-mentioned background technology.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] The present invention provides an open magnetic resonance imaging system, comprising:

[0007] Two magnetic resonance imaging units are arranged opposite to each other, close to each other laterally and spaced a certain distance apart, the magnetic resonance imaging units comprising a housing and a magnetic resonance imaging magnet arranged in the housing;

[0008] a power supply system, the power supply system comprising a cable for providing power to the magnetic resonance imaging magnet; the cable being connected to the magnetic resonance imaging magnet within the housing;

[0009] A cooling system includes a fluid conduit for conveying a coolant for cooling the magnetic resonance imaging magnet; the fluid conduit is connected to the magnetic resonance imaging magnet within the housing.

[0010] Furthermore, by adjusting the distance between the two magnetic resonance imaging units, a variety of field strength modes can be achieved; when the magnet generates a static magnetic field lower than the preset magnetic field strength, it is a low field strength working mode; when the magnet generates a static magnetic field not lower than the preset magnetic field strength, it is a high field strength working mode.

[0011] Optionally, the two magnetic resonance imaging units are respectively mounted on a pair of sliding bases that can move relative to or towards each other.

[0012] Furthermore, the two sliding bases can perform horizontal movement symmetrical to the magnetic gap separation to bring the two magnetic resonance imaging units closer together or apart, thereby adjusting the distance between the two magnetic resonance imaging units.

[0013] Furthermore, the sliding base can be slidably disposed on a base, a stand is disposed on the base, and the stand is located in a magnetic gap formed by two magnetic resonance imaging units; and a subject support unit is installed on the stand.

[0014] Furthermore, it also includes a main control system, which is connected to a driving mechanism that drives the sliding base to move in parallel.

[0015] Optionally, the two magnetic resonance imaging units are mounted on two vertically opposite brackets.

[0016] Furthermore, the bottom bracket fixes one magnetic resonance imaging unit stationary, and the upper bracket can drive another magnetic resonance imaging unit to rise and fall vertically in the vertical direction, bringing the two magnetic resonance imaging units closer or apart, thereby adjusting the distance between the two magnetic resonance imaging units.

[0017] Furthermore, it also includes a main control system, which is connected to a driving mechanism that drives the upper bracket to rise and fall vertically.

[0018] Optionally, the shape of the magnetic resonance imaging magnet is approximately arc-shaped or rectangular.

[0019] Beneficial effects of the present invention:

[0020] 1. Improve the field strength in the uniform area: The present invention significantly enhances the magnetic field strength in the uniform area by optimizing the single magnet design and the vector superposition of magnetic lines of force. After the outer magnetic fields of the two magnets overlap in the central imaging area, the bending and dispersion caused by the edge effect are reduced, and the magnetic field strength in the uniform area is increased (such as from 0.5T to 1.2T), ensuring higher imaging accuracy and quality.

[0021] 2. Expanding the homogeneous area: Under the same single magnet strength, the present invention synthesizes a uniform central magnetic field through the outer magnetic fields of two magnets, significantly expanding the uniform magnetic field area. Compared with the limitation of small shim diameter (about 30cm to 40cm) in existing open MRI systems, the present invention provides a larger imaging area shim diameter (about 50cm to 70cm), improving the overall imaging effect.

[0022] 3. Enhanced imaging range: The design of the present invention makes the magnetic field coverage of the imaging area larger, which can meet the needs of a large imaging range. Compared with the problem of limited imaging range in existing systems, this improvement provides more comprehensive diagnostic capabilities and is suitable for a wider range of clinical application scenarios.

[0023] Additional aspects and advantages of the present invention will be given in part in the following description, which will become obvious from the following description, or may be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0025] Figure 1 Schematic diagram of an existing closed MRI system.

[0026] Figure 2 Schematic diagram of an existing open MRI system.

[0027] Figure 3 This is a schematic diagram of the magnetic field lines of the synthetic magnetic field near the magnet at the ends with opposite polarities of the existing open MRI system.

[0028] Figure 4 This is a schematic diagram of magnetic force lines of a synthetic magnetic field of an open magnetic resonance imaging system according to an embodiment of the present invention, which is placed parallel to the side of a magnet.

[0029] Figure 5 Schematic diagram of the imaging area of ​​the magnet synthetic magnetic field according to the embodiment of the present invention. Figure 5 (a) The column on the side is a schematic diagram of the imaging area with the end close to the synthetic magnetic field of the magnet. Figure 5 (b) The side column is a schematic diagram of the imaging area close to the synthetic magnetic field of the magnet.

[0030] Figure 6 It is a three-dimensional structural diagram of the arc-shaped open magnetic resonance imaging system described in Example 1 of the present invention, and a schematic diagram of the coil winding method.

[0031] Figure 7 This is a front view structural diagram of the arc-shaped open magnetic resonance imaging system described in Example 1 of the present invention.

[0032] Figure 8 This is a top view of the structure of the arc-shaped open magnetic resonance imaging system described in Example 1 of the present invention.

[0033] Fig. 9 This is a three-dimensional structural diagram of an open magnetic resonance imaging system with a rectangular magnet as described in Example 2 of the present invention.

[0034] Fig.10 This is a front view structural diagram of an open magnetic resonance imaging system with a rectangular magnet as described in Example 2 of the present invention.

[0035] Fig.11 This is a side view of the open magnetic resonance imaging system with a rectangular magnet as described in Example 2 of the present invention.

[0036] Fig.12This is a top view of the open magnetic resonance imaging system with a rectangular magnet as described in Example 2 of the present invention.

[0037] Fig.13 This is a usage status diagram of the arc-shaped standing open magnetic resonance imaging system described in Example 1 of the present invention.

[0038] Among them: 1-magnetic resonance imaging unit; 2-sliding base; 3-bracket; 4-base; 5-table; 6-slide rail; 7-examination bed. DETAILED DESCRIPTION

[0039] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below by the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be interpreted as limiting the present invention.

[0040] It should be understood by those skilled in the art that unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by those skilled in the art to which this invention belongs.

[0041] It should also be understood that terms, such as those defined in commonly used dictionaries, should be understood to have a meaning consistent with that in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless as defined herein.

[0042] Those skilled in the art will appreciate that, unless otherwise stated, the singular forms "a", "an", "said" and "the" used herein may also include plural forms. It should be further understood that the term "comprising" used in the specification of the present invention refers to the presence of the features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements and / or groups thereof.

[0043] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples, unless they are contradictory.

[0044] In the description of this specification, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0045] In the description of this specification, the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present technology and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present technology.

[0046] Unless otherwise clearly specified or limited, the terms "installed", "connected", "connected", and "set" should be understood in a broad sense, for example, they can be fixedly connected or set, or detachably connected or set, or integrally connected or set. For ordinary technicians in this field, the specific meanings of the above terms in this technology can be understood according to specific circumstances.

[0047] To facilitate understanding of the present invention, the present invention is further explained below with reference to specific embodiments in conjunction with the accompanying drawings, and the specific embodiments do not constitute a limitation on the embodiments of the present invention.

[0048] Those skilled in the art should understand that the drawings are merely schematic diagrams of embodiments, and the components in the drawings are not necessarily necessary for implementing the present invention.

[0049] The present invention provides a dual-magnet discrete magnetic resonance imaging system. The system consists of two independent magnetic resonance imaging units, which synthesize a uniform central imaging magnetic field through the magnetic field outside the magnet. The two magnetic resonance imaging units are arranged in parallel, and the arrangement direction is perpendicular to the magnetic field lines of the central magnetic field. The system is equipped with a movable base, and the magnetic field strength can be flexibly adjusted to adapt to different imaging and treatment needs by adjusting the relative distance between the discrete magnets. The cooling and power supply system is integrated in the magnetic resonance imaging unit to ensure that the magnet maintains a suitable temperature and stable power supply. The system also includes a stand located in the magnetic gap for mounting a support device for the subject to be examined.

[0050] In the present invention, two independent magnets are placed in parallel, close to each other, and spaced a certain distance apart to form an imaging area. The magnets may be electromagnets or a plurality of permanent magnets arranged in a linear array.

[0051] The present invention synthesizes a uniform central magnetic field through the outer magnetic fields of two magnets, so as to improve at least one of the magnetic field strength, uniformity and imaging range in the imaging area of ​​the open MRI system, such as Figure 4 As shown. This synthetic effect has important physical significance. The magnetic field is a vector field. When the outer magnetic fields of two magnets overlap in the central imaging area, the magnetic lines of force are vector superimposed. This not only enhances the outer magnetic field strength of a single magnet, but also reduces the bending and scattering of the magnetic lines of force by mutual interference and offsetting some edge effects, making the magnetic lines of force in the edge area more linear. This reduces the gradient change of magnetic field intensity caused by the edge effect to a certain extent. Therefore, the magnetic lines of force in the imaging area of ​​the open MRI system proposed by the present invention are more parallel and evenly distributed.

[0052] In order to more intuitively demonstrate the improvement effect of the open MRI system of the present invention in at least one of the magnetic field strength, uniformity and imaging range in the imaging area, the magnetic field strength, uniformity and imaging range of the synthetic magnetic field of two discrete magnets close to the end and close to the side are compared. The coil ampere-turns of the same electromagnet monomer (400A*20000 turns) and the magnet gap are 70cm. The magnetic field strength, uniformity and imaging range of the imaging area are as follows: Figure 5 As shown (left Figure 5 (a) shows two discrete magnets arranged end-to-end. Figure 5 (b) Two separate magnets are arranged sideways. The simulation results show that the magnetic field strength in the center area of ​​the end-approach and side-approach magnets is similar, but the magnetic field uniformity and imaging range of the side-approach magnets are better than those of the end-approach magnets. The magnetic field strength in the uniform area is increased from 0.5T to 1.2T, and the uniform field diameter in the imaging area is increased from about 30-40cm to about 50-70cm, achieving the goal of improving at least one of the magnetic field strength, uniformity and imaging range in the imaging area of ​​the open MRI system of the present invention.

[0053] Example 1

[0054] like Figures 6 to 8As shown, in this embodiment 1, an open magnetic resonance imaging system is provided, which includes two magnetic resonance imaging units 1 arranged opposite to each other and spaced at a certain distance, wherein the magnetic resonance imaging unit 1 includes a housing and a magnetic resonance imaging magnet arranged in the housing; in this embodiment, a variety of field strength modes are achieved by adjusting the distance between the two magnetic resonance imaging units 1; wherein, when the magnet generates a static magnetic field lower than a preset magnetic field strength, it is a low field strength working mode; and when the magnet generates a static magnetic field not lower than a preset magnetic field strength, it is a high field strength working mode. It also includes a power supply system, wherein the power supply system includes a cable for providing electrical energy to the magnetic resonance imaging magnet; the cable is connected to the magnetic resonance imaging magnet in the housing. The open magnetic resonance imaging system of this embodiment also includes a cooling system, wherein the cooling system includes a fluid conduit for conveying a coolant, wherein the coolant is used to cool the magnetic resonance imaging magnet; the fluid conduit is connected to the magnetic resonance imaging magnet in the housing.

[0055] In this embodiment 1, Figure 6 As shown, the magnetic resonance imaging unit is an electromagnet wound by a coil, and the overall shape of the magnetic resonance imaging magnet wound by the coil is approximately arc-shaped. In addition to the coil being wound into an arc, the magnet can also be wound into a magnet with an overall rectangular or other shape. In this embodiment 1, the magnetic resonance imaging unit can also be formed by arranging a plurality of permanent magnet arrays, and the overall shape is approximately rectangular, arc-shaped or other shapes.

[0056] In this embodiment 1, the two magnetic resonance imaging units 1 are respectively mounted on a pair of sliding bases 2 that can move relative to or toward each other. The two sliding bases 2 can move horizontally symmetrically to the magnetic gap separation to bring the two magnetic resonance imaging units 1 closer or apart, thereby adjusting the distance between the two magnetic resonance imaging units 1. The open magnetic resonance imaging system of this embodiment also includes a main control system, which is connected to a driving mechanism that drives the sliding bases 2 to move in parallel.

[0057] The sliding base 2 can be slidably arranged on the base 4, and a stand 5 is arranged on the base 4. The stand 5 is located in the magnetic gap formed by the two magnetic resonance imaging units 1, and a support unit for the subject is installed on the stand. Specifically, a slide rail 6 is arranged on the base 4, and a slide groove corresponding to the slide rail 6 is arranged on the sliding base 2. By arranging a driving device such as a servo motor (not shown in the figure) on the sliding base 2, the driving shaft of the servo motor is connected to the driving gear (not shown in the figure), and a rack (not shown in the figure) meshing with the driving gear is arranged on the base 4, the main control system controls the action of the servo motor, the action of the servo motor drives the driving gear to rotate, and the rotation of the driving gear cooperates with the rack to drive the entire sliding base 2 to slide along the slide rail 6, thereby driving the magnetic resonance imaging unit to move.

[0058] like Fig. 9As shown, a vertical subject support and positioning unit can be provided on the platform in this embodiment 1, and the subject can achieve a standing posture through the subject support and positioning unit. The distance between the magnetic resonance imaging units on both sides can be controlled by the main control system, thereby achieving different field strength modes for imaging the subject.

[0059] Example 2

[0060] like Figures 10 to 13 As shown, in this embodiment 2, an open magnetic resonance imaging system is provided, comprising: two magnetic resonance imaging units 1 arranged opposite to each other and arranged at a certain distance, the magnetic resonance imaging unit 1 comprising a shell and a magnetic resonance imaging magnet arranged in the shell; by adjusting the distance between the two magnetic resonance imaging units 1, a variety of field strength modes are achieved. Specifically, in this embodiment, the two magnetic resonance imaging units 1 are respectively mounted on two vertically opposite brackets 3. The bottom bracket fixes one magnetic resonance imaging unit to remain stationary, and the upper bracket can drive the other magnetic resonance imaging unit to rise and fall vertically in the vertical direction, bringing the two magnetic resonance imaging units closer or apart, thereby adjusting the distance between the two magnetic resonance imaging units. Specifically, the open magnetic resonance imaging system of this embodiment also includes a main control system, through which the main control system is connected to a driving mechanism that drives the upper bracket to rise and fall vertically, and the main control system controls the driving mechanism to drive the upper bracket to rise and fall vertically. Among them, when the magnet generates a static magnetic field lower than the preset magnetic field strength, it is a low field strength working mode; when the magnet generates a static magnetic field not lower than the preset magnetic field strength, it is a high field strength working mode. In this embodiment 2, the magnetic resonance imaging unit is composed of a plurality of permanent magnet arrays arranged in a rectangular shape. In addition to the magnetic resonance imaging unit formed by arranging a plurality of permanent magnet arrays in a rectangular shape, it can also be arranged in an arc or other shapes. In this embodiment 2, the magnetic resonance imaging unit can also be an arc, rectangular or other shaped electromagnet wound by a coil as described in embodiment 1.

[0061] The open MRI system further comprises a power supply system, the power supply system comprising a cable for providing electrical energy to the MRI magnet; the cable is connected to the MRI magnet in the housing. The open MRI system further comprises a cooling system, the cooling system comprising a fluid conduit for conveying a coolant, the coolant being used to cool the MRI magnet; the fluid conduit is connected to the MRI magnet in the housing.

[0062] Two rectangular magnetic resonance imaging units 1 are respectively mounted on two vertically opposite brackets 3. The bottom bracket fixes one magnetic resonance imaging unit to remain stationary, and is connected to a driving mechanism for driving the upper bracket to rise and fall vertically through a main control system. The driving mechanism drives the upper bracket to rise and fall vertically, and the upper bracket can drive another magnetic resonance imaging unit to rise and fall vertically in the vertical direction. An examination bed 7 is located between the two magnetic resonance imaging units, and the examinee lies on the examination bed 7. The upper bracket is driven by the driving mechanism to rise and fall vertically, so that the two magnetic resonance imaging units are brought close to or apart, thereby adjusting the distance between the two magnetic resonance imaging units.

[0063] Although the above describes the specific implementation mode of the present invention in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative work on the basis of the technical solution disclosed in the present invention should be included in the scope of protection of the present invention.

Claims

1. An open magnetic resonance imaging system, characterized in that: include: Two magnetic resonance imaging units (1) are arranged opposite to each other, close to each other laterally and spaced a certain distance apart, the magnetic resonance imaging unit (1) comprising a housing and a magnetic resonance imaging magnet arranged in the housing; a power supply system, the power supply system comprising a cable for providing power to the magnetic resonance imaging magnet; the cable being connected to the magnetic resonance imaging magnet within the housing; a cooling system comprising a fluid conduit for conveying a coolant for cooling the magnetic resonance imaging magnet; the fluid conduit being connected to the magnetic resonance imaging magnet within the housing; Computer system: The computer system is used to control the operation of the MRI system, process the received signals, and generate images. The computer system also includes an image reconstruction algorithm for converting the raw data into a visualized image.

2. The open magnetic resonance imaging system according to claim 1, characterized in that: By adjusting the distance between the two magnetic resonance imaging units (1), a variety of field strength modes are realized; wherein, when the magnet generates a static magnetic field with a strength lower than a preset magnetic field, it is a low field strength working mode; and when the magnet generates a static magnetic field with a strength not lower than a preset magnetic field, it is a high field strength working mode.

3. The open magnetic resonance imaging system according to claim 2, characterized in that: The two magnetic resonance imaging units (1) are respectively mounted on a pair of sliding bases (2) which can move relative to or towards each other.

4. The open magnetic resonance imaging system according to claim 3, characterized in that: The two sliding bases (2) can perform horizontal movement symmetrical to the magnetic gap separation to bring the two magnetic resonance imaging units (1) closer together or apart, thereby adjusting the distance between the two magnetic resonance imaging units (1).

5. The open magnetic resonance imaging system according to claim 4, characterized in that: The sliding base can be slidably arranged on a base (4); a stand (5) is arranged on the base (4); the stand (5) is located in a magnetic gap formed by two magnetic resonance imaging units (1); and a subject support unit is installed on the stand.

6. The open magnetic resonance imaging system according to claim 5, characterized in that: It also comprises a main control system, wherein the main control system is connected to a driving mechanism for driving the sliding base (2) to move in parallel.

7. The open magnetic resonance imaging system according to claim 2, characterized in that: The two magnetic resonance imaging units (1) are mounted on two vertically opposite brackets (3).

8. The open magnetic resonance imaging system according to claim 7, characterized in that: The bottom bracket fixes one magnetic resonance imaging unit to remain stationary, and the upper bracket can drive another magnetic resonance imaging unit to rise and fall vertically, bringing the two magnetic resonance imaging units closer or apart, thereby adjusting the distance between the two magnetic resonance imaging units.

9. The open magnetic resonance imaging system according to claim 8, characterized in that: It also includes a main control system, which is connected to a driving mechanism that drives the upper bracket to rise and fall vertically.

10. The open magnetic resonance imaging system according to any one of claims 3 to 9, characterized in that: The shape of the magnetic resonance imaging magnet is approximately arc-shaped or rectangular.

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