Permanent magnetic resonance magnetic field probe centering calibration device

Abstract

The utility model relates to the technical field of magnetic resonance imaging equipment, and discloses a permanent magnetic resonance magnetic field detection head centering calibration device, which comprises a shimming plate, a magnetic field detection head arranged at the central position of one side surface of the shimming plate, and adjustable supporting pieces symmetrically arranged on the upper side and the lower side of the magnetic field detection head, the shimming plate is vertically arranged between an upper polar plate and a lower polar plate in parallel in the magnetic resonance device through adjustable supporting pieces in an overhead mode, a measuring mechanism is further arranged on one side of the shimming plate, and the measuring mechanism and the two adjustable supporting pieces are arranged in parallel. The measuring mechanism cooperates with the adjustable supporting member to cooperatively adjust the magnetic field detection head to be located at the central positions of the upper pole plate and the lower pole plate. The problems of complex operation, low efficiency and low positioning precision in the manual positioning process of the magnetic field detection head of the existing magnetic resonance imaging equipment are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of magnetic resonance imaging equipment, in particular to a centering calibration device for a permanent magnetic resonance magnetic field detection head. Background Art

[0002] In the field of magnetic resonance imaging (MRI), the uniformity and stability of the magnetic field are crucial for obtaining high-quality imaging results. The core of an MRI device is its powerful magnetic field, which is usually generated by a permanent magnet or a superconducting magnet. To ensure the accuracy and repeatability of imaging, the magnetic field probe needs to be precisely positioned at the center of the magnet.

[0003] The commonly used calibration installation method in this field is: a shim plate with a probe installed at the center is placed between the upper and lower plates using upper and lower ejector pins provided on the shim plate, and then the position of the ejector pins is manually measured and adjusted repeatedly for positioning and installation;

[0004] The above operation method is highly dependent on the operator's experience and skills, and is time-consuming and labor-intensive. In addition, since the calibration operation is manually adjusted through repeated measurements, there is a large positioning error, and the consistency and accuracy of each calibration are difficult to guarantee, which affects the imaging effect of the equipment. With the development of MRI technology, the requirements for the positioning accuracy of the magnetic field detection head are getting higher and higher, and the above calibration positioning method is difficult to meet the high-precision positioning requirements of existing equipment. Utility Model Content

[0005] In response to the shortcomings of the existing technology, the utility model provides a permanent magnet magnetic resonance magnetic field probe centering calibration device, which solves the problems of complex operation, low efficiency and low positioning accuracy in the manual positioning process of the magnetic field probe of the existing magnetic resonance imaging equipment.

[0006] In order to achieve the above objectives, this application adopts the following technical solutions.

[0007] The utility model is a centering calibration device for a permanent magnetic resonance magnetic field detector head, comprising: a shim plate, a magnetic field detector head arranged at the center position of one side of the shim plate, and adjustable supports symmetrically arranged on the upper and lower sides of the magnetic field detector head. The shim plate is vertically placed between an upper pole plate and a lower pole plate arranged in parallel in a magnetic resonance device through the adjustable support member. A measuring mechanism is also provided on one side of the shim plate. The measuring mechanism is arranged in parallel with the two adjustable supports. The measuring mechanism cooperates with the adjustable support member to coordinately adjust the magnetic field detector head to the center position of the upper pole plate and the lower pole plate.

[0008] A further improvement is that the measuring mechanism includes: a mounting seat, measuring push rods parallel to and passing through both ends of the mounting seat, and a synchronous driving structure for adjusting the up and down movement of the two measuring push rods.

[0009] Further improvements are: the mounting seat is set as an open cavity structure, the synchronous drive structure is composed of a gear arranged on the bottom surface of the inner cavity of the mounting seat and a rack arranged at the opposite inner ends of the two measuring push rods, and guide grooves adapted to the rack are provided in parallel on the bottom surface of the inner cavity of the mounting seat and on both sides of the gear, and a top cover is also provided on the mounting seat.

[0010] A further improvement is that the gear and rack are made of nylon material.

[0011] A further improvement is that the measuring push rod is made of nylon material and / or stainless steel material.

[0012] A further improvement is that the measuring mechanism further includes an adjustment handle, which is arranged at the top of the gear and is installed on the outside of the top cover.

[0013] A further improvement is that the adjustable support is connected to the field plate through a positioning seat, one end of the adjustable support is provided with a pin structure to be placed on the upper and lower pole plates, and the other end is provided with an adjustment thread to be adaptable and connected to the positioning seat, and the positioning seat is also provided with a locking structure.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] The utility model provides a measuring mechanism consisting of a mounting seat, a measuring ejector rod and a synchronous drive structure on one side of the shim plate, wherein the synchronous drive structure drives the measuring ejector rod to be synchronously and equidistantly ejected and recovered, and at the same time cooperates with the adjustable support members arranged at the upper and lower ends of the shim plate for installation and adjustment and calibration, ensuring that the magnetic field detection head arranged at the center of the shim plate is positioned at the center position of the upper plate and the lower plate, providing an efficient, accurate and easy-to-operate magnetic field detection head centering calibration device for MRI equipment to meet the high standard requirements in the field of medical imaging; a synchronous drive structure is formed by arranging a gear on the bottom surface of the inner cavity of the mounting seat and a rack adapted to be arranged on both sides of the gear, and by fixing the rack on one end of the measuring ejector rod, the two measuring ejector rods can be synchronously driven by rotating the gear. Equidistant ejection or recovery, combined with adjustable support for positioning, improves the accuracy of the magnetic field detection head centering, thereby achieving precise control of the measuring ejector and precise positioning of the shim plate, ensuring the quality and accuracy of magnetic resonance imaging after shim, thereby improving the imaging quality of MRI equipment and providing patients with more accurate diagnostic results; and its simple structure and convenient and fast operation simplify the operator's calibration process of manual repeated measurement and adjustment, reduce dependence on the operator's experience and skills, reduce the operator's labor intensity, and improve work efficiency; at the same time, the measuring mechanism is arranged on one side of the shim plate, which minimizes interference with the uniform magnetic field, ensures that the magnetic field uniformity is not affected by the calibration process, ensures the stability of the magnetic field, and provides a guarantee for the quality of magnetic resonance imaging. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model.

[0017] Figure 2 It is a schematic diagram of the installation structure of the utility model.

[0018] Figure 3 It is a front structural schematic diagram of the utility model.

[0019] Figure 4 It is a schematic diagram of the measuring mechanism of the utility model.

[0020] Figure symbols: field shim plate 1, magnetic field detection head 2, adjustable support 3, positioning seat 4, measuring mechanism 6, mounting seat 61, guide slide 611, measuring push rod 62, rack 621, gear 63, adjustment handle 64, top cover 65, upper pole plate 7, lower pole plate 8. DETAILED DESCRIPTION

[0021] In order to deepen the understanding of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings. This embodiment is only used to explain the present invention and does not constitute a limitation on the scope of protection of the present invention.

[0022] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the combination or elements referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0023] The present invention will be further described below with reference to the accompanying drawings and in combination with embodiments.

[0024] The utility model relates to a permanent magnet magnetic resonance magnetic field probe centering calibration device, which aims to ensure that the magnetic field probe in a magnetic resonance imaging (MRI) device can be accurately positioned at the center of a magnet, so as to improve the quality and accuracy of imaging.

[0025] like Figure 1-4As shown, the device includes: a shim plate 1, a magnetic field detection head 2 arranged at the center position of one side of the shim plate 1, and adjustable supports 3 symmetrically arranged on the upper and lower sides of the magnetic field detection head 2. The shim plate 1 is vertically placed between the upper pole plate 7 and the lower pole plate 8 arranged in parallel in the magnetic resonance device through the adjustable support 3. A measuring mechanism 6 is also provided on one side of the shim plate 1. The measuring mechanism 6 is arranged parallel to the two adjustable supports 3. The measuring mechanism 6 cooperates with the adjustable support 3 to adjust the magnetic field detection head 2 to the center position of the upper pole plate 7 and the lower pole plate 8; the measuring mechanism 6 includes: a mounting seat 61, a measuring push rod 62 parallel to the two ends of the mounting seat 61, and a synchronous drive structure for adjusting the up and down movement of the two measuring push rods 62; the mounting seat 61 is set as an open cavity structure, and the synchronous drive structure is fixed on the bottom surface of the inner cavity of the mounting seat 61 The gear 63 is composed of a rack 621 adapted to be arranged on both sides of the gear 63. One end of the rack 621 is connected to the measuring push rod 62. The gear 63 drives the rack 621 and the measuring push rod 62 connected to the rack 621 to move synchronously and equidistantly up and down. Most preferably, the gear 63 is installed at the center position of the bottom surface of the inner cavity, and the central axis of the gear 63 is arranged horizontally and coplanarly with the magnetic field detection head 2, which can improve the adjustment accuracy; the central axis of the gear 63 and the magnetic field detection head 2 are not arranged horizontally and coplanarly, and the synchronous adjustment effect can also be achieved. It is only necessary to adjust the meshing position of the gear and the rack during installation to control the initial position of the measuring push rod 62 extending out of the two ends of the mounting seat 61; the bottom surface of the inner cavity of the mounting seat 61 and both sides of the gear 63 are parallel to each other with guide grooves 611 adapted to the rack 621, and the mounting seat 61 is also provided with a top cover 65;

[0026] A measuring mechanism 6 is provided on one side of the shim plate 1, which is composed of a mounting seat 61, a measuring ejector rod 62 and a synchronous driving structure for driving the measuring ejector rod 62 to be synchronously and equidistantly ejected and recovered. At the same time, the adjustable support members 3 provided at the upper and lower ends of the shim plate are installed and adjusted and calibrated to ensure that the magnetic field detection head 2 set at the center of the shim plate is positioned at the center of the upper plate 7 and the lower plate 8. A synchronous driving structure is formed by providing a gear 63 and a rack 621 adapted to be provided on both sides of the gear 63 on the bottom surface of the inner cavity of the mounting seat 61. By fixing the rack 621 on one end of the measuring ejector rod 62, the gear 63 can be rotated to synchronously drive the two measuring ejector rods 62 to be equidistantly ejected or recovered. The adjustable support member 3 is then used for adjustment and positioning. The structure is simple, the calibration operation is convenient and quick, and the magnetic field detection is improved. The precision of centering the head 2 can achieve precise control of the measuring push rod 62 and precise positioning of the shim plate, ensuring the quality and accuracy of the magnetic resonance imaging after shim, thereby improving the imaging quality of the MRI equipment and providing patients with more accurate diagnostic results; at the same time, it also simplifies the operator's calibration process of manual repeated measurement and adjustment, reduces the dependence on the operator's experience and skills, reduces the operator's labor intensity, and improves work efficiency; provides an efficient, accurate, and easy-to-operate magnetic field detection head centering calibration device for MRI equipment to meet the high standards in the field of medical imaging; the measuring mechanism 6 is arranged on one side of the shim plate 1, which minimizes the interference with the uniform magnetic field, maximizes the guarantee that the magnetic field uniformity is not affected by the calibration process, ensures the stability of the magnetic field, and provides a guarantee for the quality of magnetic resonance imaging.

[0027] Preferably: the mounting base 61 and the top cover 65 are made of acrylic material, which provides support and protection for the measuring push rod 62 and the synchronous drive structure, while increasing the aesthetics and durability of the device; the gear 63, the rack 621, and the measuring push rod 62 are made of nylon material, which will not cause any interference or influence on the magnetic field, thereby ensuring the stability of the magnetic field, and the measuring push rod 62 can also be made of stainless steel; for better operability, the upward-propelled measuring push rod 62 can be made of nylon material, while the downward-propelled measuring push rod 62 is made of stainless steel material, so that it can fall freely by its own weight when in use, and drive the upper measuring push rod 62 to be automatically and equidistantly ejected synchronously to perform preliminary calibration and positioning operations, simplifying the operating steps, saving operating time, and improving calibration efficiency and reliability.

[0028] An optional implementation method: Figure 4 As shown, the measuring mechanism 6 also includes an adjusting handle 64, which is arranged at the top of the gear 63 and is installed on the outside of the top cover 65 through the mounting hole of the top cover; it is convenient to operate, accurately control the synchronous ejection distance of the measuring ejector rod, and simplify the operation process and operation steps; other automatic controllable drive structures can also be set at the top of the gear 63, such as: a controllable rotary pneumatic motor drive, which can achieve automatic adjustment and calibration.

[0029] An optional implementation method: Figure 1 As shown, the adjustable support member 3 is connected to the shim plate 1 through the positioning seat 4. One end of the adjustable support member 3 is provided with a pin structure to be placed on the upper pole plate 7 and the lower pole plate 8, and the other end is provided with an adjusting thread to be adaptable and connected to the positioning seat 4. The positioning seat 4 is also provided with a locking structure. By making the adjustable support member 3 and the positioning seat 4 adaptable and adjustable and providing the pin structure at one end of the adjustable support member 3, the shim plate 1 is provided with stable support and precise positioning, thereby ensuring the stability of the shim plate in the center of the magnet and reducing the imaging error caused by position deviation. The setting of the locking structure ensures the stability and reliability of the support.

[0030] The core component of this application is the synchronous drive structure composed of the measuring push rod 62 and the rack 621 and gear 63 arranged at one end of the measuring push rod 62. The measuring push rod 62 is not only responsible for contacting the upper and lower pole plates of the magnet, but also drives the entire calibration mechanism through its movement; the synchronous drive structure composed of the gear 63 and the rack 621 controls the synchronous up and down movement of the two measuring push rods 62 by rotating the gear 63, thereby realizing precise control of the up and down running distance of the measuring push rods 62; the setting of the adjustment handle 64 is convenient for the operator to operate and control. By pulling out and rotating the handle, the operator can control the ejection and retraction of the measuring push rod 62, thereby realizing precise adjustment of the position of the shim plate; the shim plate 1 is the key part of this application. It needs to be precisely positioned at the center of the magnet to ensure the uniformity of the magnetic field; the adjustable support 3 and the positioning seat 4 provide stable support and precise positioning for the shim plate.

[0031] During calibration, the locating base 4 is installed at the upper and lower center positions of the shim plate 1 to ensure its stability. The adjustable support 3 is then fitted into the locating base 4 using the adjustment thread provided on one end. After preliminary adjustment, it is positioned against the upper and lower pole plates of the magnet, providing a reference point for subsequent calibration. Once the adjustable support 3 is properly positioned against the pole plates, the shim plate 1 can remain perpendicular between the upper and lower pole plates without external forces, providing a stable guarantee for accurate calibration.

[0032] Pull out the handle and the downward measuring rod 62 will fall freely. During the falling process, the downward measuring rod 62 will drive the gear 63 connected to it to rotate, and then drive the other upward measuring rod 62 to move upward synchronously and equidistantly; thereby realizing the bidirectional synchronous and equidistant motion control of the two oppositely arranged measuring rods 62; when the measuring rod 62 on one of the racks 621 touches the electrode plate, the operator adjusts the upper or lower adjustable support 3 to fine-tune the field plate 1 upward or downward until the two nylon rack probes touch the electrode plate at the same time; in this way, the position of the field plate 1 is precisely controlled to ensure that it is exactly in the center position of the two electrode plates, thereby realizing the precise centering calibration of the magnetic field detection head.

[0033] After the calibration is completed, manually rotate the handle to retract the two nylon rack probes and retract the handle into the slot to complete the entire calibration process. The design of the entire device takes into account the ease of operation and accuracy of calibration, making the magnetic field calibration work of the magnetic resonance imaging equipment more efficient and accurate.

[0034] In summary, the permanent magnet magnetic resonance magnetic field detection head centering calibration device provided by the present application, by setting a synchronous and equidistant measuring mechanism to cooperate with the adjustable support member 3, not only improves the magnetic field calibration accuracy of the magnetic resonance imaging equipment, but also simplifies the operation process, reduces the labor intensity of the operator, and facilitates maintenance. At the same time, it solves the measurement error of after-sales engineers when adjusting the center of the magnetic field detection head 2, improves the consistency and repeatability of the calibration, has important practical value and broad market application prospects, and can be widely used in various permanent magnet MRI equipment.

[0035] The embodiments disclosed in the present invention are preferred embodiments, but are not limited to them. Ordinary technicians in this field can easily understand the spirit of the present invention based on the above embodiments and make different extensions and changes. As long as they do not deviate from the spirit of the present invention, they are all within the scope of protection of the present invention.

Claims

1. A permanent magnetic resonance magnetic field detection head centering calibration device, comprising: A shim plate (1), a magnetic field detector (2) arranged at the center position of one side of the shim plate (1), and adjustable supports (3) symmetrically arranged on the upper and lower sides of the magnetic field detector (2), wherein the shim plate (1) is vertically placed between an upper pole plate (7) and a lower pole plate (8) arranged in parallel in a magnetic resonance device through the adjustable support (3), and is characterized in that a measuring mechanism (6) is further provided on one side of the shim plate (1), the measuring mechanism (6) is arranged in parallel with the two adjustable supports (3), and the measuring mechanism (6) cooperates with the adjustable support (3) to coordinately adjust the magnetic field detector (2) to be located at the center position of the upper pole plate (7) and the lower pole plate (8).

2. The magnetic resonance magnetic field probe centering calibration device according to claim 1, characterized in that: The measuring mechanism (6) comprises: a mounting seat (61), measuring push rods (62) arranged parallel to and passing through both ends of the mounting seat (61), and a synchronous driving structure for regulating the up and down movement of the two measuring push rods (62).

3. The magnetic resonance magnetic field probe centering calibration device according to claim 2, characterized in that: The mounting seat (61) is configured as an open cavity structure, the synchronous drive structure is composed of a gear (63) provided on the bottom surface of the inner cavity of the mounting seat (61) and a rack (621) provided at the opposite inner ends of the two measuring push rods (62), and guide grooves (611) adapted to the rack (621) are provided in parallel on the bottom surface of the inner cavity of the mounting seat (61) and on both sides of the gear (63), and a top cover (65) is also provided on the mounting seat (61).

4. The magnetic resonance magnetic field probe centering calibration device according to claim 3, characterized in that: The gear (63) and the rack (621) are made of nylon material.

5. The magnetic resonance magnetic field probe centering calibration device according to claim 3, characterized in that: The measuring push rod (62) is made of nylon material and / or stainless steel material.

6. The magnetic resonance magnetic field probe centering calibration device according to any one of claims 1 to 5, characterized in that: The measuring mechanism (6) further includes an adjusting handle (64), which is arranged on the top of the gear (63) and is mounted on the outside of the top cover (65).

7. The magnetic resonance magnetic field probe centering calibration device according to claim 6, characterized in that: The adjustable support member (3) is connected to the uniform field plate (1) via a positioning seat (4); one end of the adjustable support member (3) is provided with a pin structure that is placed on the upper electrode plate (7) and the lower electrode plate (8); the other end is provided with an adjustment thread that is adapted to be adjustably connected to the positioning seat (4); and the positioning seat (4) is also provided with a locking structure.

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