CN217310292U - Mobile device for magnetic resonance imaging system - Google Patents

Abstract

The utility model relates to a mobile device for magnetic resonance imaging system, magnetic resonance imaging system include magnetic resonance imaging equipment and patient's bed, mobile device includes: the first bearing unit is positioned at the bottom of the magnetic resonance imaging device, used for bearing the magnetic resonance imaging device and capable of rolling; a second load bearing unit which is positioned at the bottom of the patient bed to bear the patient bed and can roll; and a moving unit which is rigidly connected to the first bearing unit and the second bearing unit on a horizontal plane parallel to the ground and does not need bearing, wherein the moving unit is configured to drive the first bearing unit and the second bearing unit to synchronously roll when moving so that the magnetic resonance imaging system moves on the ground. The utility model provides a mobile device for magnetic resonance imaging system occupation space is little, light in weight, workable, and low cost.

Description

Mobile device for magnetic resonance imaging system

Technical Field

The present invention relates to the field of Magnetic Resonance Imaging (MRI) systems, and more particularly to mobile devices for MRI systems.

Background

By mounting moving means, e.g. two caterpillar tracks, at the bottom of the MRI apparatus, the MRI apparatus can be made movable over the ground. However, there are some disadvantages to using two tracks to move the MRI apparatus. For example, electronic components of the MRI apparatus located near the bottom may interfere with the two crawlers and the scanning aperture of the MRI apparatus may be elevated, which may be disadvantageous for the patient to conveniently access the scanning aperture. If the distance between the two crawler belts is increased to be larger than the horizontal outer diameter of the MRI device, the height of the scanning aperture and the space occupied by electronic components of the MRI device near the bottom can be not significantly influenced by the two crawler belts, but the two crawler belts with the increased distance occupy larger ground space, so that the device is difficult, time-consuming and high in cost no matter the device is used, or an operating room and a diagnosis room using the MRI device are modified.

SUMMERY OF THE UTILITY MODEL

It is an object of the present invention to provide a mobile device for an MRI system which occupies little space, is light weight, easy to manufacture, and is low cost.

According to an aspect of the present invention, there is provided a mobile device for a magnetic resonance imaging system, the magnetic resonance imaging system including a magnetic resonance imaging apparatus and a patient bed, the mobile device comprising: the first bearing unit is positioned at the bottom of the magnetic resonance imaging device, used for bearing the magnetic resonance imaging device and capable of rolling; a second load bearing unit which is positioned at the bottom of the patient bed to bear the patient bed and can roll; and a moving unit which is rigidly connected to the first bearing unit and the second bearing unit on a horizontal plane parallel to the ground and does not need bearing, wherein the moving unit is configured to drive the first bearing unit and the second bearing unit to synchronously roll when moving so that the magnetic resonance imaging system moves on the ground.

Optionally, the first load bearing unit is rigidly connected to the second load bearing unit, and the moving unit is connected to the second load bearing unit away from the first load bearing unit in the longitudinal direction.

Optionally, the magnetic resonance imaging apparatus defines a scanning aperture extending along the first axis, and the moving unit comprises: a cell housing defining an internal cavity extending along a second axis, the second axis being perpendicular to the first axis; first and second wheels respectively provided at both ends of the unit case along the second axis, axial center lines of the first and second wheels being concentrically arranged in a direction parallel to the second axis; a first motor located in the inner cavity and used for driving the first wheel; and a second motor located in the interior chamber and configured to drive the second wheel.

Optionally, the first load bearing unit comprises a plurality of first load bearing sub-units, each of which comprises a plurality of load bearing rollers and a load bearing plate disposed above the plurality of load bearing rollers, wherein an axial centerline of at least some of the plurality of load bearing rollers is parallel to axial centerlines of the first and second wheels, and wherein the load bearing plate is configured to abut against the magnetic resonance imaging apparatus bottom.

Optionally, the first load-bearing unit further comprises a first connecting frame connecting the plurality of first load-bearing sub-units together without bearing load, and the mobile device further comprises: a position sensor connected to the first link frame; and a controller configured to control the mobile unit based on the position information acquired from the position sensor.

Optionally, the position sensor includes two cameras, which are respectively connected to both sides of the first connection rack in the longitudinal direction and are configured to photograph a dual color band on the ground to obtain a color contrast of the dual color band; and the controller is configured to control the moving unit based on the color contrast of the two color bands acquired from the camera.

Optionally, the second load bearing unit comprises a second attachment frame attached to the bottom of the patient bed and a plurality of rollers disposed below the second attachment frame, wherein the second attachment frame is attached to the unit housing, and wherein an axial centerline of at least some of the plurality of rollers is parallel to an axial centerline of the first and second wheels.

Optionally, at least one of the unit case, the first link frame, the second link frame, and the plurality of rollers is made of a metallic material or a non-metallic material.

Optionally, the mobile device further comprises a bottom shell configured to engage with the housing of the magnetic resonance imaging apparatus and the housing of the patient bed at the bottom of the magnetic resonance imaging apparatus and the bottom of the patient bed, thereby covering the first load bearing unit, the second load bearing unit, and the mobile unit.

Optionally, the mobile device further comprises an air cushion transport assembly disposed at a bottom of the magnetic resonance imaging apparatus, the air cushion transport assembly being configured to assist the first load bearing unit to carry the magnetic resonance imaging apparatus when the mobile unit moves.

The utility model provides an advantage that is used for mobile device of MRI system lies in: (1) the structure is simple, the processing production, the assembly and the maintenance are simplified, the material consumption is less, and the cost is greatly reduced; (2) because the mobile device has a low-profile, low profile design, there is no interference effect on the various electronic components at the bottom of the MRI system, and thus the bottom of the housing of the MRI system does not need to be modified; (3) in case at least one of the first and second attachment brackets is made of a metallic material, such as a stainless steel material, the amount of metallic material used is substantially reduced, by less than a quarter, but the load carrying weight is not, but not reduced, but rather increased, wherein each of the first load carrying sub-units can carry a weight of at least 5 tons, so that the mobile device can carry a weight of at least 20 tons (currently the heaviest MRI apparatus is also only 7-9 tons); (4) above all, since the metal material used by the moving device is reduced, especially in the case that at least one of the first connecting frame and the second connecting frame is made of engineering plastics, the metal material is hardly used, and the risk that the magnet shimming of the MRI device cannot reach the design index due to the fact that the magnet shimming is greatly influenced by the nearby metal is greatly reduced; (5) the mobile device is also convenient to disassemble and transport, is suitable for various MRI devices, does not need special design, is attractive, and can be hardly seen.

Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments of the invention, which proceeds with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.

Fig. 1 is a bottom perspective view of an MRI system according to an embodiment of the present invention.

Fig. 2 is a bottom perspective view of a mobile device for an MRI system according to an embodiment of the present invention.

Fig. 3 is a top perspective view of the mobile device for an MRI system of fig. 2.

Fig. 4 is a bottom perspective view of a mobile device for an MRI system according to another embodiment of the present invention.

Detailed Description

Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: unless specifically stated otherwise, the relative arrangement of parts and steps, numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present invention.

Techniques, systems, devices, and apparatuses known to one of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.

In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

In addition, unless expressly stated otherwise, references to "coupled" herein are to be construed broadly, as they may be fixed, removable, or integral, and may be directly coupled or indirectly coupled through an intervening medium. Also, references herein to "below" and "bottom" refer to directions toward the ground with respect to gravity, while "above" refers to directions away from the ground with respect to gravity.

Referring to fig. 1, the MRI system includes an MRI apparatus 100 and a patient bed 200 integrated with the MRI apparatus 100. In one aspect, the MRI apparatus 100 primarily includes a cylindrical superconducting magnet arrangement, a gradient coil arrangement, and a Radio Frequency (RF) coil arrangement, coaxially arranged from outside to inside in a radial direction, which are not visible in fig. 1, as well as other accessory components, due to being surrounded by the housing 16 of the MRI apparatus 100. A substantially central scanning aperture is defined by a cylindrical superconducting magnet arrangement, a gradient coil arrangement, and an RF coil arrangement, the scanning aperture having a first axis, and first and second ports (not shown) located at either end of the scanning aperture along the first axis, wherein the first port 10 is also referred to as a patient end (patient end) and the second port is also referred to as a service end (service end).

On the other hand, the patient bed 200 includes a patient table 12 on which a patient lies, a support frame 14 for supporting the patient table 12, and a base (not shown) connected to the support frame 14 opposite the patient table 12. For example, the support frame 14 may be raised and lowered by hydraulic lift cylinders to assist a patient with impaired mobility by sitting on the patient table 12 and then lying down. Alternatively, the height of the support frame 14 may also be fixed, so that the patient table 12 is always aligned with the first port 10, thereby omitting the process that would require a correct alignment of the patient table 12 with the first port 10 if the patient table 12 were to be lifted.

MRI systems may be used in diagnostic rooms configured to provide an enclosed space with cleanliness that complies with the medical standards of scanning diagnosis, such that a patient who only needs to perform MRI can be scanned in the enclosed space by the MRI system. For example, the patient may first lie on the patient table 12 and then be fed into the scanning aperture from the first port 10.

The MRI system may also be moved to an operating room in spatial communication with the diagnostic room, the operating room being configured to provide an enclosed space having a cleanliness meeting medical standards for surgery and interventional therapy, so that a patient to be treated by means of the intraoperative MRI method or the interventional MRI method can be subjected to surgery or interventional therapy by a surgeon in the enclosed space. Thus, the operating room serves both as a surgical operating room in which surgical operations (e.g. neurosurgery) can be performed and as an interventional therapy room in which (minimally invasive) interventional therapy can be performed. Although the patient couch 200 integrated with the MRI apparatus 100 is synchronously moved to the operating room when the MRI apparatus 100 is moved into the operating room, an additional patient table 12 in the operating room is required to be aligned with the second port so that the patient can be fed into the scanning aperture from the second port on the additional patient table 12.

Between the diagnostic room and the operating room there is a door, e.g. a radio frequency shielded door, which when closed, is spatially separated from the other, and when open, the MRI system can be moved between the diagnostic room and the operating room. Therefore, if the MRI apparatus 100 is installed with two crawlers that make its floor space significantly large, it is likely that the door also has to be modified wider to enable the MRI system to move between the operating room and the diagnosis room through the door.

Referring to fig. 2 to 4, an exemplary moving device for an MRI system generally includes a first load bearing unit 110 that is located at the bottom of the MRI apparatus 100 to carry the MRI apparatus 100 and is rollable, a second load bearing unit 120 that is located at the bottom of a patient bed 200 to carry the patient bed 200 and is rollable, and a moving unit 130 that is rigidly connected to the first load bearing unit 110 and the second load bearing unit 120 on a horizontal plane parallel to the ground without load bearing, for bringing the first load bearing unit 110 and the second load bearing unit 120 to roll synchronously when the moving unit 130 moves, so that the MRI system moves on the ground.

As shown in fig. 4, the moving unit 130 may be located between the MRI apparatus 100 and the patient bed 200. More preferably, as shown in fig. 2 and 3, the first load bearing unit 110 is rigidly connected to the second load bearing unit 120, and the moving unit 130 is rigidly connected to the second load bearing unit 120 on a horizontal plane parallel to the ground in a manner away from the first load bearing unit 110 in a longitudinal direction parallel to the first axis, so that the moving unit 130 can be located at the lower front of the patient bed 200 away from the MRI apparatus 100.

Optionally, the mobile unit 130 comprises: a cell housing 24 defining an internal cavity extending along a second axis, the second axis being perpendicular to the first axis; first and second wheels 26 and 28 respectively provided at both ends of the unit case 24 along the second axis, axial center lines of the first and second wheels 26 and 28 being concentrically arranged in a direction parallel to the second axis; a first motor 30 located in the interior chamber and adapted to drive the first wheel 26; and a second motor 32 located in the interior chamber and for driving the second wheel 28. For example, when the first and second motors 30 and 32 rotate forward at the same speed, the moving unit 130 moves forward, when the first and second motors 30 and 32 rotate backward at the same speed, the moving unit 130 moves backward, and when one of the first and second motors 30 and 32 rotates forward and the other rotates backward, and/or the rotation speeds of the first and second motors 30 and 32 are different, the moving unit 130 turns at an angle.

Since the moving unit 130 does not need to bear a weight, particularly, the weight of the MRI apparatus 100, it is possible to dispense with consideration of the strength of the moving unit 130, particularly, a unit case, and also to easily inspect, repair, and modify the moving unit 130 when necessary.

In addition, in the case where the first and second motors 30 and 32 are configured as non-magnetic resonance compatible general motors, if the moving unit 130 is disposed close to the MRI apparatus 100, uniformity of the magnet of the MRI apparatus 100 may be affected, resulting in degradation of quality of scanned images, and conversely, the first and second motors 30 and 32 having ferromagnetism may not operate normally, even be damaged due to heat, by a strong magnetic field of the superconducting magnet device of the MRI apparatus 100. To prevent this, in the present invention, the moving unit 130 may be connected to the second load bearing unit 120 in a manner of being distant from the first load bearing unit 110 in the longitudinal direction, so that the moving unit 130 may be located at the lower front of the patient bed 200 distant from the MRI apparatus 100, and the magnetic field strength at which the motor is located may be reduced by 40 times, thereby avoiding the mutual influence between the moving unit 130 and the MRI apparatus 100.

Optionally, the first load bearing unit 110 comprises a plurality of, for example four, first load bearing subunits 34, each first load bearing subunit 34 comprising a plurality of load bearing rollers 36 and a load bearing plate 38 located above the plurality of load bearing rollers 36, each load bearing plate 38 being configured to abut against or near a respective one of the corners of the bottom of the MRI apparatus 100.

The axial centerlines of at least some of the plurality of load bearing rollers 36 are parallel to the axial centerlines of the first and second wheels 26, 28 such that the linear speed and direction of movement of the first load bearing unit 110 is consistent with the linear speed and direction of movement of the first and/or second wheels 26, 28. Meanwhile, the axial center lines of the other of the plurality of bearing rollers 36 may be rotatable on a horizontal plane. It will be appreciated that the height of the axial centre lines of the load bearing rollers 36 is equal and may be lower than the height of the axial centre lines of the first and second wheels 26, 28 to ensure a low profile of the first load bearing unit 110.

In addition, the bearing plate 38 abutting against the bottom of the MRI apparatus 100 means that the first bearing unit 110 may be placed directly at the bottom of the MRI apparatus 100 to facilitate the handling of the first bearing unit 110 from the bottom of the MRI apparatus 100, or the bearing plate 38 may be attached to the bottom of the MRI apparatus 100 by means of a connection, such as a screw or the like. In any event, the first load bearing unit 110 hardly increases the height of the MRI apparatus 100, and the area of the first load bearing subunit 34 is also significantly smaller relative to the area of the bottom of the MRI apparatus 100, without affecting the arrangement of the electronic components of the MRI apparatus 100 located near the bottom.

Optionally, the first load bearing unit 110 further comprises a first connecting frame 40 connecting the plurality of first load bearing sub-units 34 together, and the first connecting frame 40 does not abut against the bottom of the MRI apparatus 100 and does not need to bear load.

Optionally, the second load bearing unit 120 includes a second link 60 connected to the base of the patient bed 200 and a plurality of rollers 62 disposed below the second link 60. The second link frame 60 is rigidly connected to the first link frame 40. For example, the second connecting frame 60 may be configured as a panel that matches the base of the patient bed 200, and the plurality of rollers 62 may be two or three in number and respectively connected to a portion of the panel below the panel that is remote from the moving unit 130. In the present invention, the roller 62 close to the moving unit 130 under the panel is omitted, and the pressure transmitted by the panel to the first wheel 26 and the second wheel 28 which are not bearing can be increased, and the friction between the first wheel 26 and the second wheel 28 and the ground can be increased, so as to increase the driving force for moving the first wheel 26 and the second wheel 28 back and forth.

The second attachment frame 60 can be connected to the unit housing 24 directly, or by means of a connection, for example a fastening screw, or by means of a fitting structure, so that the mobile unit 130 is rigidly connected to the second load-bearing unit 120 at least in a horizontal plane. The manner of rigid connection between the mobile unit 130 and the second load bearing unit 120 is also not limited.

Additionally, the axial centerlines of at least some of the plurality of rollers 62 are parallel to the axial centerlines of the first and second wheels 26, 28 such that the linear velocity and direction of motion of the plurality of rollers 62 is consistent with the linear velocity and direction of motion of the first and/or second wheels 26, 28. Accordingly, when the moving unit 130 moves, i.e., the first motor 30 and the second motor 32 drive the first wheel 26 and the second wheel 28 to roll, respectively, the first wheel 26 and the second wheel 28 will drive the plurality of load bearing rollers 36 and the plurality of rollers 62 to roll synchronously, so that the MRI apparatus 100 and the patient bed 200 move following a desired path on the floor between the diagnosis room and the operating room. Therefore, the moving unit 130, the first load bearing unit 110, and the second load bearing unit 120 together constitute an integrated mechanism capable of synchronously rolling toward a specific direction at a specific speed.

In addition, since the patient bed 200 is significantly lighter in weight compared to, for example, a 5-10 ton MRI apparatus 100, the load bearing requirements for the plurality of rollers 62 will be significantly lower than the load bearing requirements for the plurality of load bearing rollers 36, and at least one, and preferably all, of the plurality of rollers 62 may be configured as a rubber wheel, a roller made of polyurethane plastic, or a roller made of other non-metallic material, such that the plurality of rollers 62 do not affect the shimming of the magnets of the MRI apparatus.

In practice, at least one of the unit case 24, the first link frame 40, the second link frame 60, and the plurality of rollers 62 may be made of a metallic material or a non-metallic material. For example, the metal material of which the second connecting frame 60 is made may be stainless steel material, but due to the special configuration of the exemplary moving device of the present invention, the material usage of the stainless steel material will be greatly reduced, and due to the strict requirement of the MRI apparatus for the weight of the metal material in a certain distance range, it will become extremely important to reduce the material usage of the metal material used by the moving device adjacent to the MRI apparatus. As another example, the non-metallic material from which the first linkage frame 40 is fabricated may be an engineering plastic (e.g., polyoxymethylene) or other non-metallic material, as the first linkage frame 40 is not load bearing.

Optionally, the exemplary mobile device further comprises: a position sensor connected to the first link frame 40; and a mobile device controller capable of communicating with the position sensor, the mobile device controller being configured to control the mobile unit 130, i.e. to independently control the first motor 30 and the second motor 32, based on position information obtained from the position sensor, wherein the mobile device controller may be provided separately in the inner cavity of the unit housing 24, alternatively the mobile device controller may also be integrated in the MRI system controller.

For example, the position sensor includes two cameras that are respectively connected to both sides of the first link 40 in the longitudinal direction and configured to photograph a dual color band on the ground to acquire a color contrast of the dual color band. The dual color strip may be laid in a straight line on the floor between the diagnostic room and the operating room, one end of the dual color strip in the diagnostic room defining the first position and the other end of the dual color strip in the operating room defining the second position.

Then, the mobile device controller controls the mobile unit 130 based on the color contrast of the two color bands acquired from at least one of the two cameras so that the mobile unit 130 moves along a desired path defined by the two color bands. For example, one of the two cameras close to the first position takes a double color band when the MRI apparatus 100 moves from the second position to the first position, and the other of the two cameras close to the second position takes a double color band when the MRI apparatus 100 moves from the first position to the second position.

By way of example only, in the case where the first load bearing unit 110 comprises four first load bearing subunits 34, the first connecting rack 40 comprises a first bar 42 interconnecting two first load bearing subunits 34 close to the mobile unit 130 and a second bar 44 interconnecting two first load bearing subunits 34 remote from the mobile unit 130, the first bar 42 and the second bar 44 representing both sides of the first connecting rack 40 in the longitudinal direction. The one camera may be provided at position a of the first lever 42 and the other camera at position B of the second lever 44, a virtual line connecting position a and position B being parallel to and in the same vertical plane as the first axis.

It will be appreciated that the position sensor may also or alternatively be configured in any other known manner. For example, the position sensor may be configured as an optical sensor to receive modulated infrared radiation emitted by an infrared emitter installed in, for example, an operating room. As another example, the position sensor may be configured as an ultrasonic sensor that employs reflective ranging and determines the position of the object through algorithms such as triangulation. For another example, the position sensor may be configured as a laser SLAM sensor to enable positioning navigation by using natural environments in the operating room and the diagnosis room, such as pillars, wall surfaces, and the like in the room, as positioning references. As another example, the position sensor may be configured as a GPS positioning sensor such that the MRI system may move with an accuracy of ≦ 1 mm.

Optionally, returning to fig. 1, the exemplary mobile device further comprises a bottom shell 22, the bottom shell 22 being configured to engage the housing 16 of the MRI apparatus 100 and the housing of the patient bed 200 at the bottom of the MRI apparatus 100 and at the base of the patient bed 200, respectively, for covering the first load bearing unit 110, the second load bearing unit 120, and the mobile unit 130 located at the lower front of the patient bed 200.

Optionally, the exemplary moving device further includes a detachable air cushion transport assembly disposed at the bottom of the MRI apparatus 100, the air cushion transport assembly being configured to assist the first load bearing unit 110 in carrying the MRI apparatus 100 when the moving unit 130 moves. For example, the air cushion transport assembly may include an air bag provided at the bottom of the MRI apparatus 100 and an air inlet duct to the air bag, and the air cushion transport assembly does not interfere with the first load bearing unit 110 in position. After the air bag is filled with compressed air, for example from an air compressor, by means of the air inlet duct, an air chamber will be formed below the bottom of the MRI apparatus 100 to assist in supporting the MRI apparatus 100, so that the first load bearing unit 110 does not need to bear the entire weight of the MRI apparatus 100 when the moving unit 130 moves, thereby increasing the mobility flexibility of the first load bearing unit 110.

Although some specific embodiments of the present invention have been described in detail by way of illustration, it should be understood by those skilled in the art that the above illustration is only for purposes of illustration and is not intended to limit the scope of the invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.

Claims (10)

1. A mobile arrangement for a magnetic resonance imaging system comprising a magnetic resonance imaging apparatus (100) and a patient bed (200), characterized in that the mobile arrangement comprises:

a first bearing unit (110) which is positioned at the bottom of the magnetic resonance imaging device (100) to bear the magnetic resonance imaging device (100) and can roll;

a second load bearing unit (120) located at the bottom of the patient bed (200) to bear the patient bed (200) and capable of rolling; and

a mobile unit (130) rigidly connected to the first load bearing unit (110) and the second load bearing unit (120) on a horizontal plane parallel to the ground without bearing a load, the mobile unit (130) being configured to bring the first load bearing unit (110) and the second load bearing unit (120) to roll synchronously when moving, so that the magnetic resonance imaging system moves on the ground.

2. The moving apparatus for a magnetic resonance imaging system according to claim 1, characterized in that the first load bearing unit (110) is rigidly connected to the second load bearing unit (120) and the moving unit (130) is connected to the second load bearing unit (120) in a manner distant from the first load bearing unit (110) in the longitudinal direction.

3. The moving apparatus for a magnetic resonance imaging system according to claim 1 or 2, characterized in that the magnetic resonance imaging device (100) defines a scanning aperture extending along the first axis, and the moving unit (130) comprises:

a cell housing (24) defining an internal cavity extending along a second axis, the second axis being perpendicular to the first axis;

a first wheel (26) and a second wheel (28) respectively provided at both ends of the unit case (24) along the second axis, axial center lines of the first wheel (26) and the second wheel (28) being concentrically arranged in a direction parallel to the second axis;

a first motor (30) located in the interior chamber and configured to drive the first wheel (26); and

a second motor (32) located in the interior chamber and configured to drive the second wheel (28).

4. The moving device for a magnetic resonance imaging system according to claim 3, wherein the first load bearing unit (110) comprises a plurality of first load bearing sub-units (34), each first load bearing sub-unit (34) comprising a plurality of load bearing rollers (36) and a load bearing plate (38) arranged above the plurality of load bearing rollers (36), wherein an axial centerline of at least some of the plurality of load bearing rollers (36) is parallel to an axial centerline of the first wheel (26) and the second wheel (28), and wherein the load bearing plate (38) is configured to abut against a bottom of the magnetic resonance imaging apparatus (100).

5. The mobile device for a magnetic resonance imaging system according to claim 4, wherein the first load bearing unit (110) further comprises a first connection bracket (40) connecting the plurality of first load bearing sub-units (34) together without load bearing, and the mobile device further comprises:

a position sensor connected to the first link frame (40); and

a controller configured to control the mobile unit (130) based on the position information acquired from the position sensor.

6. The mobile device for a magnetic resonance imaging system according to claim 5, wherein the position sensor comprises two cameras which are respectively connected to both sides of the first connection frame (40) in the longitudinal direction and are configured to photograph a dual color band on the ground to obtain a color contrast of the dual color band; and

the controller is configured to control the mobile unit (130) based on the color contrast of the dual color band obtained from the camera.

7. The mobile device for a magnetic resonance imaging system according to claim 5, wherein the second load-bearing unit (120) comprises a second connection frame (60) connected to the bottom of the patient bed (200) and a plurality of rollers (62) disposed below the second connection frame (60), wherein the second connection frame (60) is connected to the unit housing (24), and wherein the axial centerlines of at least some of the plurality of rollers (62) are parallel to the axial centerlines of the first and second wheels (26, 28).

8. The mobile device for a magnetic resonance imaging system according to claim 7, wherein at least one of the unit case (24), the first link frame (40), the second link frame (60), and the plurality of rollers (62) is made of a metallic material or a non-metallic material.

9. The mobile device for a magnetic resonance imaging system according to claim 1 or 2, further comprising a bottom case (22), the bottom case (22) being configured to be coupled to the housing (16) of the magnetic resonance imaging apparatus (100) and the housing (16) of the patient bed (200) at a bottom of the magnetic resonance imaging apparatus (100) and a bottom of the patient bed (200) so as to cover the first load bearing unit (110), the second load bearing unit (120), and the mobile unit (130).

10. The mobile device for a magnetic resonance imaging system according to claim 1 or 2, further comprising an air cushion transport assembly disposed at a bottom of the magnetic resonance imaging apparatus (100), the air cushion transport assembly being configured to assist the first load bearing unit (110) to carry the magnetic resonance imaging apparatus (100) when the mobile unit (130) is moving.

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