Auxiliary device for measuring magnetic resonance water model center

Abstract

The utility model discloses an auxiliary device for measuring the center of a magnetic resonance water model, which belongs to the technical field of debugging equipment of a magnetic resonance imaging system and comprises a telescopic frame, the telescopic frame comprises four telescopic arms which are sequentially connected, and the axes of the four telescopic arms are respectively positioned on four sides of the same rectangle; the telescopic arm comprises a guide cylinder and a guide rod extending into the guide cylinder, and the guide rod can move along the axis of the guide cylinder relative to the guide cylinder; the four positioning holes are located in the four corners of the telescopic frame respectively and located in the same plane. The two silk threads are arranged in a staggered mode, and the silk threads sequentially penetrate through the two positioning holes located in the opposite angles of the telescopic frame and are tensioned. The telescopic frame can be arranged on the water mold in a sleeved mode, each telescopic arm abuts against the water mold to sleeve the water mold by adjusting the length of the telescopic arms, the two silk threads penetrate through the two positioning holes in the opposite angles respectively and intersect, the intersection point is the center of the water mold, positioning of the center of the water mold is accurate, and the debugging efficiency of a magnetic resonance imaging system can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of magnetic resonance imaging system debugging equipment, in particular to an auxiliary device for measuring the center of a magnetic resonance water phantom. Background Art

[0002] Magnetic resonance imaging (MRI) determines the location and type of atomic nuclei that make up an object based on the different attenuation of released energy in different structures within a substance and detects the emitted electromagnetic waves through an external gradient magnetic field. This allows for the creation of a structural image of the object's interior. As one of the most advanced imaging techniques, MRI is widely used clinically and can perform functional imaging of the brain, neck, spine, chest, and other parts of the body.

[0003] Before being officially used in clinical practice, the magnetic resonance imaging system needs to be continuously debugged to ensure the quality of the magnetic resonance imaging. At this time, the water phantom is used as a scanning sample for imaging, and the magnetic resonance imaging system is continuously adjusted and optimized according to the imaging quality. Specifically, in the early stages of debugging the magnetic resonance imaging system, the water phantom is needed as a reference to simulate the scan in order to detect the imaging effect. However, during the scanning process, the imaging position may be sometimes above, sometimes below, sometimes to the left, and sometimes to the right, which will seriously affect the imaging quality. This requires continuous adjustment of the water phantom position, which increases unnecessary time.

[0004] Therefore, the research and development of an auxiliary device that can accurately locate the center of the water model, improve the debugging efficiency of the magnetic resonance imaging system, and has a simple structure and is easy to use is an urgent problem to be solved at this stage. Utility Model Content

[0005] In response to the problems existing in the prior art, the utility model provides an auxiliary device for measuring the center of a magnetic resonance water model. The telescopic frame can be conveniently put on the water model. By adjusting the length of the telescopic arm, each telescopic arm is made to abut against the water model and firmly hold the water model. Two silk threads pass through two diagonal positioning holes respectively and intersect in the telescopic frame. The intersection of the two silk threads is the center of the water model. The positioning of the center of the water model is accurate, which can reduce the error in positioning. The center of the water model is accurately placed at the center of the magnet to ensure that the imaging position is centered, which can improve the debugging efficiency of the magnetic resonance imaging system. It has a simple structure, low cost and is easy to use.

[0006] In order to achieve the above purpose, the technical solution adopted by the present utility model is as follows:

[0007] The utility model provides an auxiliary device for measuring the center of a magnetic resonance water phantom, comprising:

[0008] A telescopic frame comprising four telescopic arms connected in series, wherein the axes of the four telescopic arms are respectively located on four sides of a same rectangle; the telescopic arms include a guide cylinder extending along the axis thereof and a guide rod extending into the guide cylinder, wherein the guide rod is movable relative to the guide cylinder along the axis thereof;

[0009] Four positioning holes, the four positioning holes are respectively located at the four corners of the telescopic frame, and the four positioning holes are located in the same plane;

[0010] Two silk threads are arranged in an interlaced manner, and the silk threads are sequentially passed through the two positioning holes located at the diagonal positions of the telescopic frame and are tightened.

[0011] As a preferred technical solution, a through hole is provided on the side wall of the guide cylinder near one end of the guide rod, and a pressure block is provided in the through hole; a locking portion is provided on the outside of the guide cylinder, which can drive the pressure block to move radially along the guide cylinder.

[0012] As a preferred technical solution, the locking part includes a locking block, which abuts against the pressure block; the guide cylinder is provided with a rotating shaft fixedly connected to it, and the locking block is rotatably arranged on the rotating shaft, and the rotating shaft is located at the eccentric point of the locking block.

[0013] As a preferred technical solution, a handle is provided on the locking block; when the handle is perpendicular to the plane where the axes of the four telescopic arms are located, the thickness of the portion of the locking block located between the rotating shaft and the pressing block is the smallest.

[0014] As a preferred technical solution, a connecting elbow is provided between adjacent telescopic arms, and adjacent telescopic arms are fixedly connected to the connecting elbow.

[0015] As a preferred technical solution, the connecting elbow is provided with a positioning rod rotatably connected thereto, and the positioning hole is provided on the positioning rod.

[0016] As a preferred technical solution, a rotating seat is provided on the connecting elbow, and the positioning rod is hinged to the rotating seat via a pin;

[0017] And / or, the axis of the positioning hole intersects with the rotation axis of the positioning rod;

[0018] And / or, the rotation axis of the positioning rod is parallel to the plane where the axes of the four telescopic arms are located;

[0019] And / or, the angle of the connecting elbow is set to 90°.

[0020] As a preferred technical solution, the plane where the four positioning holes are located is parallel to the plane where the axes of the four telescopic arms are located.

[0021] As a preferred technical solution, the cross sections of the guide cylinder and the guide rod are both square.

[0022] As a preferred technical solution, the guide cylinder and the guide rod are clearance-fitted;

[0023] And / or, the axis of the guide cylinder is colinear with the axis of the guide rod.

[0024] The beneficial effects of the present invention are as follows:

[0025] The telescopic frame of the present invention can be conveniently sleeved on the water model. By squeezing the diagonal corners of the telescopic frame, each telescopic arm can be brought into contact with the water model and firmly sleeved on the water model. The two silk threads respectively pass through the two positioning holes at the diagonal corners of the telescopic frame and intersect in the telescopic frame. The intersection of the two silk threads is the center of the water model, which can accurately locate the center of the water model and reduce the error in positioning. The center of the water model can then be accurately placed at the center of the magnet to ensure that the imaging position is centered, thereby improving the debugging efficiency of the magnetic resonance imaging system. The structure is simple, the cost is low, and it is easy to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the overall structure of an embodiment of an auxiliary device for measuring the center of a magnetic resonance water phantom according to the present invention;

[0027] Figure 2 for Figure 1 Schematic diagram of the structure of the telescopic arm;

[0028] Figure 3 for Figure 2 A schematic structural diagram of the locking portion and the pressing block;

[0029] Figure 4 for Figure 1 Schematic diagram of the structure of the connecting elbow and positioning rod.

[0030] In the figure: 1-telescopic frame, 2-telescopic arm, 21-guide cylinder, 22-guide rod, 23-pressing block, 24-locking block, 25-rotating shaft, 26-handle, 3-positioning rod, 31-positioning hole, 4-connecting elbow, 41-rotating seat. DETAILED DESCRIPTION

[0031] In order to facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0032] Please refer to Figure 1-Figure 4, is an embodiment of an auxiliary device for measuring the center of a magnetic resonance water phantom provided by the present invention, comprising a telescopic frame 1, the telescopic frame 1 comprising four telescopic arms 2 connected in sequence, the axes of the four telescopic arms 2 being respectively located on the four sides of the same rectangle; the telescopic arm 2 comprises a guide cylinder 21 extending along its axis and a guide rod 22 extending into the guide cylinder 21, the guide rod 22 being movable along its axis relative to the guide cylinder 21, and by pulling or squeezing the diagonal corners of the telescopic frame 1, the lengths of the four telescopic arms 2 or two parallel telescopic arms 2 can be adjusted simultaneously, thereby adjusting the size of the telescopic frame 1; specifically, the telescopic frame 1 is enlarged and sleeved on the water phantom, and then the four telescopic arms 2 are shortened until they abut against the water phantom, so that the telescopic frame 1 can be firmly sleeved on the water phantom;

[0033] There are positioning holes 31 at the four corners of the telescopic frame 1, and the four positioning holes 31 should be located in the same plane; two silk threads (not shown in the figure) are arranged in an interlaced manner, and the silk threads pass through the two positioning holes 31 located at the diagonal positions of the telescopic frame 1 in turn and are tightened. When the telescopic frame 1 is firmly mounted on the water mold, the intersection of the two silk threads is the center of the water mold, which can accurately locate the center of the water mold.

[0034] It should be noted that the water model is usually in the shape of a cube or a cylinder, and the plane where the four positioning holes 31 are located should be parallel to the plane where the axes of the four telescopic arms 2 are located, that is, the plane where the two silk threads are located is parallel to the plane where the axes of the four telescopic arms 2 are located, ensuring that the two silk threads can accurately locate the center of the water model.

[0035] In this embodiment, please refer to Figure 1-Figure 3 The cross-sections of the guide cylinder 21 and the guide rod 22 are both square, so that the inner wall surface of the telescopic frame 1 is flat, and when it abuts against the water model, it has a sufficiently large abutment surface and can be firmly tightened on the water model; further, the guide cylinder 21 and the guide rod 22 are clearance-matched, and the axis of the guide cylinder 21 and the axis of the guide rod 22 should be collinear with the axis of the telescopic arm 2, while ensuring that the guide rod 22 can move smoothly along the guide cylinder 21 to realize the extension and retraction of the telescopic arm 2, and the guide rod 22 will not rotate relative to the guide cylinder 21; in other embodiments, the cross-sections of the guide cylinder 21 and the guide rod 22 can also be other shapes, such as hexagonal, triangular, etc., so that the telescopic frame 1 can be firmly tightened when it is set on the water model.

[0036] In this embodiment, please refer to Figure 1-Figure 3A through hole is provided on the side wall of the guide cylinder 21 at one end near the guide rod 22, and a pressure block 23 is provided in the through hole; a locking portion is provided on the outside of the guide cylinder 21, which can drive the pressure block 23 to move radially along the guide cylinder 21. When the locking portion is in a locked state, the pressure block 23 can be pressed tightly against the guide rod 22, fixing the guide cylinder 21 and the guide rod 22 to keep the telescopic arm 2 at a specific length; when the locking portion is in an open state, the pressure block 23 will not apply a pressing force to the guide rod 22, and the guide rod 22 can move smoothly along the guide cylinder 21 to achieve adjustment of the length of the telescopic arm 2; it should be noted that the radial direction of the guide cylinder 21 is based on the axis of the guide cylinder 21.

[0037] For further information, please refer to Figure 1-Figure 3 The locking portion includes a locking block 24, which abuts against the pressure block 23; a rotating shaft 25 fixedly connected to the guide cylinder 21 is provided, and the locking block 24 is rotatably provided on the rotating shaft 25. The cross-section of the locking block 24 is preferably circular, and the rotating shaft 25 is located at the eccentric point of the locking block 24. When the locking block 24 rotates around the rotating shaft 25, the thickness of the portion of the locking block 24 located between the rotating shaft 25 and the pressure block 23 changes, thereby enabling the pressure block 23 to move radially along the guide cylinder 21.

[0038] For further information, please refer to Figure 1-Figure 3 A handle 26 is provided on the locking block 24, which can be used to easily drive the locking block 24 to rotate; when the handle 26 is perpendicular to the plane where the axis of the four telescopic arms 2 is located, the thickness of the portion of the locking block 24 located between the rotating shaft 25 and the pressing block 23 is the smallest. At this time, the locking part is in the open state, and the length of the telescopic arm 2 can be easily adjusted while the handle 26 will not interfere with the water model.

[0039] In this embodiment, please refer to Figure 1 and Figure 4 , connecting elbows 4 are provided between adjacent telescopic arms 2, and adjacent telescopic arms 2 are fixedly connected to the connecting elbows 4. The connecting elbows 4 can connect the telescopic arms 2 in sequence to form a telescopic frame 1, which is convenient for installation and production; further, the surfaces of the inner wall of the adjacent telescopic arms 2 used to form the telescopic frame 1 should directly intersect and be arranged vertically, so that the telescopic frame 1 can be better mounted on the cubic water model; specifically, the angle of the connecting elbow 4 should be set to 90° to ensure that the axes of adjacent telescopic arms 2 are perpendicular to each other; further, connecting protrusions are provided at both ends of the connecting elbow 4, and connecting holes matching the connecting protrusions are provided at both ends of the telescopic arm 2. The connecting protrusions extend into the connecting holes to achieve preliminary positioning, and the fixed connection between the telescopic arm 2 and the connecting elbow 4 is achieved by welding or interference fit.

[0040] Based on the above examples, please refer to Figure 1 and Figure 4The connecting elbow 4 is provided with a positioning rod 3 rotatably connected to it, and a positioning hole 31 is provided on the positioning rod 3 to facilitate the threading of the silk thread; specifically, the connecting elbow 4 is provided with a rotating seat 41, and the positioning rod 3 and the rotating seat 41 are hinged by a pin shaft to realize the rotation of the positioning rod 3 relative to the connecting elbow 4. After the silk thread is threaded, the positioning rod 3 should be set perpendicular to the telescopic frame 1 to avoid interference between the positioning rod 3 and the water model. When the telescopic frame 1 is not in use, the positioning rod 3 is set parallel to the telescopic frame 1 for easy storage.

[0041] It should be noted that the axis of the positioning hole 31 should intersect with the rotation axis of the positioning rod 3 to ensure that the rotation of the positioning rod 3 does not affect the position of the silk thread and ensures that the center of the water model is accurately positioned.

[0042] Specifically, the rotation axis of the positioning rod 3 should be parallel to the plane where the axes of the four telescopic arms 2 are located, so that the plane where the two silk threads are located is parallel to the plane where the axes of the four telescopic arms 2 are located, ensuring that the intersection of the two silk threads can accurately reflect the center of the water mold.

[0043] Please refer to Figure 1-Figure 4 , the specific usage of this utility model is as follows:

[0044] Put the locking part in the open state, pull the diagonal corners of the telescopic frame 1 to make the telescopic frame 1 larger, place the water mold in the telescopic frame 1, squeeze the diagonal corners of the telescopic frame 1 to shrink the telescopic frame 1 until all four telescopic arms 2 abut against the water mold;

[0045] Rotate the locking part to lock it and fix the size of the telescopic frame 1; rotate the positioning rod 3 to an angle perpendicular to the telescopic frame 1, and then pass the two wires through the two positioning holes 31 at the diagonal positions of the telescopic frame 1 and tighten them. The intersection of the two wires is the center of the water model.

[0046] It should be noted that in order to ensure the accuracy of positioning, the silk thread should be set as a non-elastic silk thread.

[0047] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. An auxiliary device for measuring the center of a magnetic resonance water phantom, characterized in that: include: A telescopic frame (1), the telescopic frame (1) comprising four telescopic arms (2) connected in sequence, wherein the axes of the four telescopic arms (2) are respectively located on four sides of the same rectangle; the telescopic arm (2) comprises a guide cylinder (21) extending along its axis and a guide rod (22) extending into the guide cylinder (21), wherein the guide rod (22) is movable relative to the guide cylinder (21) along its axis; Four positioning holes (31), the four positioning holes (31) are respectively located at the four corners of the telescopic frame (1), and the four positioning holes (31) are located in the same plane; Two silk threads are arranged in an interlaced manner, and the silk threads are sequentially passed through the two positioning holes (31) located at the diagonal positions of the telescopic frame (1) and are tightened.

2. The auxiliary device for measuring the center of a magnetic resonance water phantom according to claim 1, characterized in that: A through hole is provided on the side wall of one end of the guide cylinder (21) close to the guide rod (22), and a pressure block (23) is provided in the through hole; a locking portion capable of driving the pressure block (23) to move radially along the guide cylinder (21) is provided on the outside of the guide cylinder (21).

3. The auxiliary device for measuring the center of a magnetic resonance water phantom according to claim 2, characterized in that: The locking portion includes a locking block (24), and the locking block (24) abuts against the pressure block (23); the guide cylinder (21) is provided with a rotating shaft (25) fixedly connected thereto, and the locking block (24) is rotatably arranged on the rotating shaft (25), and the rotating shaft (25) is located at an eccentric point of the locking block (24).

4. The auxiliary device for measuring the center of a magnetic resonance water phantom according to claim 3, characterized in that: The locking block (24) is provided with a handle (26); when the handle (26) is perpendicular to the plane where the axes of the four telescopic arms (2) are located, the thickness of the portion of the locking block (24) located between the rotating shaft (25) and the pressing block (23) is the smallest.

5. The auxiliary device for measuring the center of a magnetic resonance water phantom according to claim 1, characterized in that: A connecting elbow (4) is provided between adjacent telescopic arms (2), and the adjacent telescopic arms (2) are fixedly connected to the connecting elbow (4).

6. The auxiliary device for measuring the center of a magnetic resonance water phantom according to claim 5, characterized in that: The connecting elbow (4) is provided with a positioning rod (3) rotatably connected thereto, and the positioning hole (31) is provided on the positioning rod (3).

7. The auxiliary device for measuring the center of a magnetic resonance water phantom according to claim 6, characterized in that: The connecting elbow (4) is provided with a rotating seat (41), and the positioning rod (3) and the rotating seat (41) are hingedly connected via a pin shaft; And / or, the axis of the positioning hole (31) intersects with the rotation axis of the positioning rod (3); And / or, the rotation axis of the positioning rod (3) is parallel to the plane where the axis centers of the four telescopic arms (2) are located; And / or, the angle of the connecting elbow (4) is set to 90°.

8. The auxiliary device for measuring the center of a magnetic resonance water phantom according to claim 1 or 6, characterized in that: The plane where the four positioning holes (31) are located is parallel to the plane where the axis centers of the four telescopic arms (2) are located.

9. The auxiliary device for measuring the center of a magnetic resonance water phantom according to claim 1, characterized in that: The cross sections of the guide cylinder (21) and the guide rod (22) are both square.

10. The auxiliary device for measuring the center of a magnetic resonance water phantom according to claim 1 or 9, characterized in that: The guide cylinder (21) and the guide rod (22) are clearance-matched; And / or, the axis of the guide cylinder (21) is colinear with the axis of the guide rod (22).

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