CN215641773U - Magnetic resonance apparatus - Google Patents

Abstract

The utility model relates to a magnetic resonance apparatus comprising: the magnetic body is provided with an effective imaging area, and a detection channel with an opening is formed in the magnetic body along a first direction; the electromagnetic shielding mechanism is arranged on the magnet and covers the opening; the bed body is movably arranged in the detection channel along a first direction; wherein, electromagnetic shield structure can be along the first direction to being close to and keeping away from effective imaging area flexible. So, through setting up telescopic electromagnetic shield mechanism, can enlarge and dwindle the electromagnetic shield space that encloses between electromagnetic shield mechanism and the magnet and close the formation as required, realize the expansion of detection area, be convenient for make the detection object all pass through the effective imaging area of magnet from beginning to end through the removal bed body, conveniently carry out whole body's formation of image to the detection object and detect. Meanwhile, in the process of carrying out local imaging detection or moving transportation on the detection object, the electromagnetic shielding mechanism can be contracted, the size of the magnetic resonance device is reduced, and the practicability is improved.

Description

Magnetic resonance apparatus

Technical Field

The utility model relates to the technical field of magnetic resonance detection, in particular to a magnetic resonance device.

Background

Magnetic Resonance Imaging (MRI) technology integrates modern electromagnetism, atomic physics, quantum mechanics, biochemistry and modern digital signal processing technology, and is one of the aspects of the high development of modern science and technology and the high civilization of human society. Compared with other medical imaging methods, magnetic resonance imaging has the advantages of high speed, high resolution, multi-parameter and multi-contrast, no invasive injury, no radiation and the like, becomes one of the most important examination means of clinical medicine, makes a great contribution to the health cause of human beings, and has important clinical application value in medical examination.

The MRI system is composed of three parts, namely a magnet, a gradient and radio frequency, and mainly realizes imaging by magnetic resonance of an organism H1, in practical application, only 4ppm (four parts per million) of an excited organism H1 can generate a magnetic resonance phenomenon to send out a magnetic resonance signal for a magnetic field of 1 Tesla, so the signal is very weak, the magnet, the gradient coil, the radio frequency coil and other hardware and software are usually combined, a shielding room is used for highly isolating external electromagnetic wave interference to image, otherwise, noise or artifacts of the image are caused slightly, the quality of the image is influenced, and the imaging cannot be realized seriously.

At present, in the field of human body magnetic resonance, in order to ensure that a patient has a comfortable examination space, a shielding room is generally used, the magnetic resonance system and external electromagnetic waves can be highly isolated by the shielding room, the construction difficulty of the shielding room is high, the construction process is long, and the capital investment is large. When the magnetic resonance system is used for detecting and imaging the pet, because the pet is small in size, the detection channel can be arranged in the magnet, and the self-shielding system is realized by virtue of the metal external cavity of the magnet, so that a shielding chamber is not required to be independently built, the system cost is reduced, and the site construction time is shortened.

However, since the effective imaging Field of view (FOV) of the magnetic resonance system is generally the central region of the magnet, when a large examination subject needs to be examined all around from the beginning to the end, the examination subject needs to be moved continuously to move the region of interest to the FOV region, and when a pet in an anesthetic state is examined, for example, the position of the examination subject needs to be adjusted by moving the examination subject several times, which affects the examination efficiency.

SUMMERY OF THE UTILITY MODEL

In view of this, it is necessary to provide a magnetic resonance apparatus for solving a problem that a conventional self-shielded magnetic resonance apparatus cannot easily detect a subject from the beginning to the end.

A magnetic resonance apparatus, the magnetic resonance apparatus comprising:

the detection device comprises a magnet, a detection unit and a control unit, wherein a detection channel with an opening is formed in the magnet along a first direction, and an effective imaging area is arranged in the detection channel;

the electromagnetic shielding mechanism is arranged on the magnet and covers the opening; and

the bed body is movably arranged in the detection channel along the first direction;

wherein the electromagnetic shielding mechanism is capable of extending and retracting toward and away from the effective imaging area along the first direction.

In the above magnetic resonance apparatus, generally, the effective imaging area on the magnet is a central area of the magnet, that is, a middle area of the internal detection channel of the magnet along the first direction, and if a detection object is to be detected and imaged from head to tail, the bed body needs to be moved in the detection channel along the first direction to drive the detection object to sequentially pass through the effective imaging area from head to tail. Simultaneously, in order to allow the bed body to freely move along the first direction in the detection passageway, electromagnetic shield mechanism can expand along the first direction to the direction of keeping away from effective imaging area, enlarges the inside space of electromagnetic shield mechanism, allows the bed body to drive the detection object through effective imaging area from beginning to end, does not need constantly to adjust the position of detection object on the bed body to make the detection object pass through effective imaging area from beginning to end, improves detection efficiency. In addition, after the whole-body detection is finished, the electromagnetic shielding mechanism can be contracted along the first direction to the direction close to the effective imaging area, the whole volume of the magnetic resonance detection device cannot be increased, the storage and the transportation are convenient, and the practicability is improved.

In one embodiment, the electromagnetic shielding mechanism includes a shielding cover body and a retractable shielding member, the shielding cover body is disposed outside the opening, and the retractable shielding member is connected between the shielding cover body and the magnet.

In one embodiment, the electromagnetic shielding mechanism further comprises a connecting assembly, the connecting assembly comprises a first connecting piece and a second connecting piece which are relatively movably connected along the first direction, one of the first connecting piece and the second connecting piece is connected with the magnet, and the other of the first connecting piece and the second connecting piece is connected with the shielding cover body.

In one embodiment, the magnet includes a body and a flange, the flange is convexly disposed at an end of the body in the first direction and extends into the telescopic member, one of the first connecting member and the second connecting member is connected to the flange, and the other of the first connecting member and the second connecting member is connected to the shielding cover.

In one embodiment, the shielding cover body comprises a shielding ring and a shielding cover, the shielding ring is connected with one side of the telescopic shielding piece, which faces away from the magnet, and the shielding cover is arranged on one side of the shielding ring, which faces away from the magnet in an openable and closable manner.

In one embodiment, one of the shielding ring and the shielding cover is provided with an annular protrusion, and the other of the shielding ring and the shielding cover is provided with an annular groove; when the shielding cover covers the shielding ring, the annular bulge is embedded in the annular groove.

In one embodiment, the shielding cover body further includes an elastic shielding strip, the elastic shielding strip extends along the circumferential direction of the annular groove and is filled in the annular groove, and the annular protrusion can be embedded in the annular groove and abuts against the elastic shielding strip.

In one embodiment, the shielding cover body is provided with an observation window, and a shielding layer is arranged inside the observation window.

In one embodiment, the retractable shield is made of any one of copper foil, aluminum foil, metal mesh, and metal fiber.

In one embodiment, the magnet is provided with the detection channel along the first direction, and the detection channel is provided with two openings which are distributed oppositely in the first direction;

the number of the electromagnetic shielding mechanisms is two, and the electromagnetic shielding mechanisms are arranged at the opening.

Drawings

Figure 1 is a schematic view of a magnetic resonance apparatus according to an embodiment of the present invention;

figure 2 is a schematic view of the magnetic resonance apparatus of figure 1 from another perspective;

figure 3 is a schematic cross-sectional view of the magnetic resonance apparatus of figure 1 in one state;

figure 4 is a schematic cross-sectional view of the magnetic resonance apparatus of figure 3 in another state;

figure 5 is a schematic cross-sectional view of the magnetic resonance apparatus of figure 3 in a further state;

figure 6 is a schematic cross-sectional view of the magnetic resonance apparatus of figure 3 in a further state;

figure 7 is an exploded view of the magnetic resonance apparatus of figure 1;

figure 8 is a partially exploded view of the magnetic resonance apparatus of figure 1;

figure 9 is a schematic view of a portion of the magnetic resonance apparatus of figure 1;

fig. 10 is a partially enlarged view of the magnetic resonance apparatus I shown in fig. 4.

100. A magnetic resonance device; 10. a magnet; 11. a detection channel; 12. a body; 13. an effective imaging area; 14. a flange; 30. an electromagnetic shielding mechanism; 32. a shielding cage body; 321. a shield ring; 322. an annular projection; 323. a shield cover; 324. an annular groove; 325. an observation window; 327. a locking member; 34. a retractable shield; 36. a connecting assembly; 361. a first connecting member; 363. a second connecting member; 40. a bed body; 50. a waveguide conduit; 60. a filtering component; 200. an object is detected.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the utility model and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the utility model.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

Referring to fig. 1-2, in an embodiment of the present invention, a magnetic resonance apparatus 100 is provided, including a magnet 10, a bed 40 and an electromagnetic shielding mechanism 30, wherein the magnet 10 is provided with a detection channel 11 having an opening along a first direction, the bed 40 is movably disposed in the detection channel 11 along the first direction, the bed 40 is used to carry a detection object 200, and when the bed 40 is driven to move along the first direction, the detection object 200 can be driven to move along the first direction and enter the detection channel 11; the electromagnetic shielding mechanism 30 is disposed on the magnet 10 and covers the opening, so as to form an independent electromagnetic shielding space inside the detection channel 11, and prevent an external magnetic field from interfering with the magnetic field inside the detection channel 11 to affect the imaging result.

Furthermore, the detection channel 11 has an effective imaging area 13 inside, and the electromagnetic shielding mechanism 30 can be extended and retracted toward and away from the effective imaging area 13 in the first direction. Generally, the effective imaging area 13 on the magnet 10 is a central area of the magnet 10, that is, a middle area of the detection channel 11 inside the magnet 10 along the first direction, and in order to perform detection imaging on the detection object 200 from head to tail, the bed 40 needs to move in the detection channel 11 along the first direction (as shown in fig. 3-6) to drive the detection object 200 to sequentially pass through the effective imaging area 13 from head to tail. Meanwhile, in order to allow the bed body 40 to freely move in the detection channel 11 along the first direction, the electromagnetic shielding mechanism 30 can be unfolded along the first direction towards the direction away from the effective imaging area 13, so that the space inside the electromagnetic shielding mechanism 30 is enlarged, the bed body 40 is allowed to drive the detection object 200 to pass through the effective imaging area 13 from beginning to end, the position of the detection object 200 on the bed body 40 does not need to be continuously adjusted to enable the detection object 200 to pass through the effective imaging area 13 from beginning to end, and the detection efficiency is improved. In addition, after the whole body detection is finished, the electromagnetic shielding mechanism 30 can be contracted in the direction close to the effective imaging region 13 along the first direction, so that the whole volume of the magnetic resonance detection device is not increased, the storage and the transportation are convenient, and the practicability is improved.

As shown in fig. 4 and 7-9, in some embodiments, electromagnetic shielding mechanism 30 includes a shielding cage 32 and a retractable shield 34, shield 32 is disposed outside the opening, and retractable shield 34 is coupled between shield 32 and magnet 10. When the space inside the electromagnetic shielding mechanism 30 needs to be enlarged, the shielding housing 32 is driven to move in the first direction away from the magnet 10, so that the retractable shielding member 34 can be stretched, the space inside the retractable shielding member 34 is enlarged, and a sufficient space is provided for the movement of the bed 40 in the detection passage 11. Optionally, the retractable shielding element 34 is connected to the magnet 10 by welding, clamping, or adhering a conductive adhesive, and the retractable shielding element 34 is connected to the magnet 10 by welding, clamping, or adhering a conductive adhesive, so that an independent electromagnetic shielding space is defined among the magnet 10, the retractable shielding element 34, and the shielding cover 32, and an external electromagnetic field is prevented from interfering with a magnetic resonance signal in the detection channel 11.

Alternatively, the retractable shield 34 is made of any one of copper foil, aluminum foil, metal mesh, and metal fiber, so that the retractable shield 34 can achieve both electromagnetic shielding and extension and contraction in the first direction. Wherein, the metal mesh can be an aluminum mesh or a copper mesh.

It is understood that in other embodiments, the electromagnetic shielding mechanism 30 can be a multi-section telescopic structure, such as a telescopic structure similar to the main shaft of an umbrella; alternatively, the electromagnetic shielding mechanism 30 may be configured to be a structure that drives the electromagnetic shielding mechanism 30 to extend and retract by a rotary motion by using a screw principle, and the manner of extending and retracting the electromagnetic shielding mechanism 30 is not limited herein.

In some embodiments, the shielding enclosure 32 includes a shielding ring 321 and a shielding cover 323, the shielding ring 321 is connected to a side of the retractable shielding member 34 facing away from the magnet 10, and the shielding cover 323 is openably disposed on a side of the shielding ring 321 facing away from the magnet 10. Equivalently, the shielding cover 323 can be opened, so as to allow the detection channel 11 inside the magnet 10 to communicate with the outside through the through hole on the shielding ring 321, and the detection object 200 can be sent into the detection channel 11 through the through hole on the shielding ring 321 and placed on the bed body 40. In addition, after the detection object 200 is placed, the shielding cover 323 may also be closed, so that the shielding cover 323 shields the through hole of the shielding ring 321, so as to form an independent electromagnetic shielding space between the shielding cover 323, the shielding ring 321, the retractable shielding member 34 and the magnet 10, and prevent the external magnetic field from entering the detection channel 11 to affect the imaging result.

Further, one of the shielding ring 321 and the shielding cover 323 is provided with an annular protrusion 322, and the other of the shielding ring 321 and the shielding cover 323 is provided with an annular groove 324; when the shielding cover 323 covers the shielding ring 321, the annular protrusion 322 is embedded in the annular groove 324, so that the shielding cover 323 reliably covers the shielding ring 321 by the cooperation of the annular protrusion 322 and the annular groove 324, and the shielding cover 323 is prevented from being easily separated from the shielding ring 321 in a covering state.

As shown in fig. 10, optionally, the shielding shell 32 further includes an elastic shielding strip, the elastic shielding strip extends along the circumferential direction of the annular groove 324 and is filled in the annular groove 324, the annular protrusion 322 can be embedded in the annular groove 324 and abuts against the elastic shielding strip, which is equivalent to filling the elastic shielding strip between the annular protrusion 322 and the inner wall of the annular groove 324, so as to prevent the electromagnetic wave leakage caused by the contact gap existing after the annular protrusion 322 is embedded in the annular groove 324, and destroy the self-shielding effect of the magnetic resonance apparatus 100. For example, the resilient shielding strip is a flexible copper strip or other flexible strip of electromagnetic shielding material.

Specifically, as shown in fig. 8, one end of the shielding cover 323 is rotatably hinged to the shielding ring 321, and the other end of the shielding cover 323 is rotatable around the hinge point of the shielding ring 321 and the shielding ring 321 to be connected to or separated from the shielding ring 321, so that the shielding cover 323 can be opened or closed by rotating the shielding cover 323. Optionally, the shielding cover 323 is connected to the shielding ring 321 through a hinge with elastic damping, a maximum included angle and a minimum included angle exist when the shielding cover 323 rotates relative to the shielding ring 321, the shielding cover 323 can stay at any position between the maximum included angle and the minimum included angle relative to the shielding ring 321 through the hinge with elastic damping, and the detection object 200 can be conveniently taken and placed through a through hole in the shielding ring 321.

Optionally, the shielding cage 32 further includes a locking member 327, and the locking member 327 is used to lock the shielding cover 323 and the shielding ring 321 to cover each other, so as to prevent the shielding cover 323 from being opened by mistake.

Still optionally, the shielding cover 32 is provided with an observation window 325, and a shielding layer is disposed inside the observation window 325. On the one hand, the detection object 200 in the detection channel 11 can be checked through the observation window 325, and a shielding layer is arranged inside the observation window 325, so that the observation window 325 has an electromagnetic shielding function, and the inside of the detection channel 11 is prevented from being interfered by external electromagnetic waves. For example, the shielding layer is a copper mesh, a flexible conductive portion, a conductive film, or other electromagnetic shielding material layer. It will be appreciated that in some embodiments, the shielding enclosure 32 is a unitary body, and the viewing window 325 is provided on the side of the shielding enclosure 32 facing away from the magnet 10; in other embodiments, the shield enclosure includes the shield ring 321 and the shield cover 323, and the viewing window 325 is disposed on the shield cover 323.

As shown in fig. 7-9, in some embodiments, the electromagnetic shielding mechanism 30 further includes a connecting assembly 36, the connecting assembly 36 includes a first connecting member 361 and a second connecting member 363 that are movably connected in a first direction, one of the first connecting member 361 and the second connecting member 363 is connected to the magnet 10, and the other of the first connecting member 361 and the second connecting member 363 is connected to the shielding cage 32. In this way, the shield case 32 and the magnet 10 are connected by the connection member 36, and the connection reliability of the shield case 32 is improved. Also, the first connecting member 361 and the second connecting member 363 in the connecting assembly 36 are relatively movable in the first direction; when the retractable shielding element 34 is retracted and the shielding cage 32 moves toward and away from the magnet 10, the first connecting element 361 and the second connecting element 363 of the connecting assembly 36 can be driven to move relatively, and the connecting assembly 36 can connect the shielding cage 32 moving relative to the magnet 10 all the time, so that the installation reliability is improved, and the extension function of the electromagnetic shielding mechanism 30 is realized.

Further, the magnet 10 includes a body 12 and a flange 14, the flange 14 is disposed to protrude from an end of the body 12 in the first direction and extends into the telescopic member, one of the first connecting member 361 and the second connecting member 363 is connected to the flange 14, and the other of the first connecting member 361 and the second connecting member 363 is connected to the shielding case 32. The body 12 of the magnet 10 is generally cylindrical, which is inconvenient for directly connecting other components on the axial end surface of the cylinder, and the flange 14 is convexly arranged on the axial end part of the body 12, so that the connecting component 36 can be matched and connected through the flange 14, and the connecting component 36 and the magnet 10 can be conveniently assembled and connected.

In some embodiments, the magnetic resonance apparatus 100 further includes a guide rail disposed in the detection channel 11 inside the magnet 10 along the first direction, and the bed 40 is movably disposed on the guide rail to guide the bed 40 to move back and forth along the first direction through the guide rail.

As shown in fig. 2, in some embodiments, the magnetic resonance apparatus 100 further includes a waveguide 50, the waveguide 50 is disposed protruding on a side of the shielding cover 323 facing away from the magnet 10, and a waveguide channel communicated with the detection channel 11 is disposed inside the waveguide 50, the waveguide channel allows an optical fiber and a non-metal pipeline to penetrate through the detection channel 11 and then extend to the outside, and attenuates the influence of the radio frequency signal on the use effect of the device by the waveguide channel, so that the waveguide 50 realizes the connection between the detection channel 11 and the outside, and simultaneously isolates the interference of the external stray signal on the detection channel 11. Optionally, the magnetic resonance apparatus 100 further includes a filter assembly 60, the filter assembly 60 is disposed on a side of the shielding cover 323 facing away from the magnet 10, and the filter assembly 60 connects the inside of the detection channel 11 with the outside while isolating interference of external stray signals in the detection channel 11.

In some embodiments, the magnet 10 has a detection channel 11 penetrating along the first direction, the detection channel 11 has two openings distributed oppositely in the first direction, and both ends of the detection channel 11 along the first direction can be communicated with the outside through the corresponding openings. In addition, the number of the electromagnetic shielding mechanisms 30 is two, each opening is provided with the electromagnetic shielding mechanism 30, which is equivalent to that the two openings at the two opposite ends of the detection channel 11 are provided with the electromagnetic shielding mechanisms 30, the two openings at the two ends of the detection channel 11 are respectively covered by the two electromagnetic shielding mechanisms 30, an independent electromagnetic shielding space is formed between the two electromagnetic shielding mechanisms 30 and the magnet 10 in an enclosing manner, the two electromagnetic shielding mechanisms 30 are both retractable, the electromagnetic shielding space inside the magnetic resonance device 100 can be enlarged by the two electromagnetic shielding mechanisms 30, and imaging detection of the detection object 200 can be performed from head to tail more conveniently.

As shown in fig. 1-2, in particular, the shielding enclosure 32 of one of the two electromagnetic shielding mechanisms 30 is a whole, the waveguide 50, the filter assembly 60 and the observation window 325 are disposed on the shielding enclosure 32, the shielding enclosure 32 of the other of the two electromagnetic shielding mechanisms 30 includes a shielding ring 321 and a shielding cover 323, and the observation window 325 is disposed on the shielding cover 323.

It is understood that, in other embodiments, the opening and the electromagnetic shielding mechanism 30 may be disposed only on one side of the detection channel 11 in the first direction, and are not limited herein.

In the magnetic resonance device 100, by providing the retractable electromagnetic shielding mechanism 30, the electromagnetic shielding space formed by the enclosure between the electromagnetic shielding mechanism 30 and the magnet 10 can be enlarged and reduced as required, so that the detection object 200 can pass through the effective imaging area 13 of the magnet 10 from the beginning to the end by moving the bed body 40, and the whole body imaging detection of the detection object 200 can be conveniently performed. Meanwhile, in the process of carrying out local imaging detection or moving transportation on the detection object 200, the electromagnetic shielding mechanism 30 can be contracted, the volume of the magnetic resonance device 100 is reduced, and the practicability is improved.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the utility model. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (10)

1. An apparatus for magnetic resonance, comprising:

the detection device comprises a magnet, a detection unit and a control unit, wherein a detection channel with an opening is formed in the magnet along a first direction, and an effective imaging area is arranged in the detection channel;

the electromagnetic shielding mechanism is arranged on the magnet and covers the opening; and

the bed body is movably arranged in the detection channel along the first direction;

wherein the electromagnetic shielding mechanism is capable of extending and retracting toward and away from the effective imaging area along the first direction.

2. The mr apparatus of claim 1, wherein the electromagnetic shielding mechanism includes a shielding cage disposed outside the opening and a retractable shield coupled between the shielding cage and the magnet.

3. The mr apparatus of claim 2, wherein the electromagnetic shielding mechanism further comprises a coupling assembly including first and second coupling members relatively movably coupled in the first direction, one of the first and second coupling members being coupled to the magnet, the other of the first and second coupling members being coupled to the shielding cage.

4. The mrd of claim 3, wherein the magnet includes a body and a flange, the flange is disposed to protrude from an end of the body in the first direction and extends into the telescopic member, one of the first and second connectors is connected to the flange, and the other of the first and second connectors is connected to the shield.

5. The mrd of claim 2, wherein the shield enclosure includes a shield ring and a shield cover, the shield ring is connected to a side of the retractable shield facing away from the magnet, and the shield cover is openably disposed on a side of the shield ring facing away from the magnet.

6. The magnetic resonance apparatus according to claim 5, wherein one of the shield ring and the shield cover is provided with an annular protrusion, and the other of the shield ring and the shield cover is provided with an annular groove; when the shielding cover covers the shielding ring, the annular bulge is embedded in the annular groove.

7. The magnetic resonance apparatus according to claim 6, wherein the shielding cover further includes an elastic shielding strip extending along a circumferential direction of the annular groove and filled in the annular groove, and the annular protrusion is capable of being embedded in the annular groove and abutting against the elastic shielding strip.

8. The magnetic resonance apparatus according to any one of claims 2 to 7, wherein the shielding cover body is provided with an observation window, and a shielding layer is arranged inside the observation window.

9. The mrd of any one of claims 2-7, wherein said retractable shield is made of any one of copper foil, aluminum foil, metal mesh and metal fibers.

10. The mrd of any one of claims 1-7, wherein said magnet has said detection channel extending therethrough along said first direction, said detection channel having two of said openings oppositely disposed along said first direction;

the number of the electromagnetic shielding mechanisms is two, and the electromagnetic shielding mechanisms are arranged at the opening.

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