A magnetic resonance imaging system

Abstract

The present application relates to a nuclear magnetic resonance imaging system, including an imaging device and an adjusting device; the imaging device includes a housing and a variable capacitor installed in the housing; the housing is rotatably mounted with an adjusting member corresponding to the variable capacitor on the end face; the adjusting member has a first adjusting head extending into the housing and inserted into the adjusting slot; the adjusting device includes an adjusting bracket, an adjusting motor installed on the adjusting bracket and corresponding to the adjusting member one by one and used to drive the adjusting member to rotate, and the adjusting motor is a magnetically compatible ultrasonic motor. The present application has the effect of adjusting the capacitance value of the variable capacitor without the need for the adjusting personnel to enter the detection hole of the nuclear magnetic resonance instrument when adjusting the capacitance value of the variable capacitor, and the adjustment method is efficient and convenient.

Description

Technical Field

[0001] The present application relates to the field of nuclear magnetic resonance imaging, and in particular to a nuclear magnetic resonance imaging system. Background Art

[0002] Capacitors are indispensable components in magnetic resonance imaging systems. The imaging quality of the magnetic resonance imaging system can be adjusted by adjusting the capacitance value of the capacitor. Therefore, variable capacitors are usually used in magnetic resonance imaging systems.

[0003] Reference Figure 1 , which is a schematic diagram of the structure of an existing variable capacitor. The variable capacitor 13 has a rotatably arranged adjustment knob 131, and an adjustment slot 132 is provided on the adjustment knob 131. The adjustment personnel can adjust the capacitance value of the variable capacitor 13 by rotating the adjustment knob 131 of the variable capacitor 13.

[0004] The nuclear magnetic resonance imaging system is usually placed in the detection cavity of the nuclear magnetic resonance apparatus. When the capacitance value 131 of the variable capacitor 13 needs to be adjusted, the adjuster usually needs to drill into the detection cavity of the nuclear magnetic resonance apparatus to adjust the capacitance value of the variable capacitor 13.

[0005] With respect to the above-mentioned related technologies, the inventor believes that the operation of adjusting the capacitance value of the variable capacitor 13 in the above-mentioned nuclear magnetic resonance imaging system is relatively complicated. Summary of the invention

[0006] In order to facilitate the adjustment of the capacitance value of a variable capacitor in a nuclear magnetic resonance imaging system, the present application provides a nuclear magnetic resonance imaging system.

[0007] The present application provides a nuclear magnetic resonance imaging system, which adopts the following technical solution:

[0008] A nuclear magnetic resonance imaging system comprises an imaging device and an adjusting device; the imaging device comprises a shell and a variable capacitor installed in the shell; an adjusting piece corresponding to the variable capacitor is rotatably installed on the end surface of the shell; the adjusting piece has a first adjusting head extending into the shell and inserted into the adjusting slot; the adjusting device comprises an adjusting bracket, an adjusting motor installed on the adjusting bracket and corresponding to the adjusting piece one by one and used to drive the adjusting piece to rotate, and the adjusting motor is a magnetically compatible ultrasonic motor.

[0009] By adopting the above technical solution, the above-mentioned nuclear magnetic resonance imaging system can adjust the capacitance value of the variable capacitor through the adjustment device, and the specific steps are as follows: the adjustment motor drives the adjustment member to rotate, and the adjustment member and the variable capacitor are circumferentially locked through the cooperation of the first adjustment head and the adjustment slot, that is, when the adjustment member rotates, the adjustment knob of the variable capacitor rotates synchronously, thereby adjusting the capacitance value of the variable capacitor. When the above-mentioned nuclear magnetic resonance imaging system adjusts the capacitance value of the variable capacitor, the adjustment personnel do not need to enter the detection hole of the nuclear magnetic resonance instrument to complete the adjustment of the capacitance value of the variable capacitor, and the adjustment method is efficient and convenient.

[0010] Among them, the motor that drives the adjustment member to rotate is a magnetically compatible ultrasonic motor, so that the above-mentioned nuclear magnetic resonance imaging system can be applied to a nuclear magnetic resonance apparatus with little impact on the imaging of the nuclear magnetic resonance apparatus.

[0011] Optionally, the adjustment device includes a slide rail parallel to the axis of the shell and a slide drive assembly; the adjustment bracket has a slider that can slide on the slide rail, and the slide drive assembly drives the adjustment bracket to slide along the length direction of the slide rail.

[0012] By adopting the above technical solution, since the above-mentioned nuclear magnetic resonance imaging system needs to be installed in the detection hole cavity of the nuclear magnetic resonance apparatus, the setting of the above-mentioned structure enables the adjustment device to slide out of the detection hole cavity of the nuclear magnetic resonance apparatus along the slide rail, thereby facilitating regular maintenance of the adjustment device.

[0013] And although the magnetically compatible ultrasonic motor has little effect on the imaging of the nuclear magnetic resonance apparatus, when the nuclear magnetic resonance apparatus is started, moving the adjustment device out of the detection hole cavity of the nuclear magnetic resonance apparatus can reduce the effect of the adjustment device on the imaging of the nuclear magnetic resonance apparatus, making the imaging of the nuclear magnetic resonance imaging system more accurate.

[0014] Optionally, the sliding drive assembly includes a driving screw, a screw nut and a screw motor; the driving screw is parallel to the sliding rail; the screw nut is mounted on the adjusting bracket and is adapted to the driving screw; the screw motor is installed at one end of the driving screw away from the housing, and drives the driving screw to rotate.

[0015] By adopting the above-mentioned technical solution, the combination of driving the lead screw, lead screw nut and lead screw motor makes the positioning accuracy of the adjusting device on the slide rail higher and the moving speed slower, so that when the adjusting motor in the adjusting device cooperates with the adjusting part, the impact on the adjusting part is smaller, which helps to extend the service life of the adjusting part.

[0016] Optionally, it also includes a bottom rail and a supporting base plate slidably mounted on the bottom rail, wherein the supporting base plate is an arc-shaped plate; the number of the sliding rails is two, and they are respectively mounted on both sides of the supporting base plate; the driving screw is also mounted on one side of the supporting base plate.

[0017] By adopting the above technical solution, the bottom rail can be installed in the detection cavity of the nuclear magnetic resonance apparatus, and then the supporting bottom plate can be slidably installed on the supporting bottom plate, so that the experimental subject can be conveniently sent into the detection cavity of the nuclear magnetic resonance apparatus, and the head of the experimental subject can be conveniently placed in the imaging device. Among them, the slide rail and the driving screw are both arranged on both sides of the supporting bottom plate, so that the experimental subject has a relatively ideal placement area.

[0018] Optionally, an adjusting assembly is also installed on the output shaft of the adjusting motor; the adjusting assembly includes a fixed seat, a movable seat and an adjusting spring; the fixed seat is fixed to the end of the output shaft; the movable seat is located on the side of the fixed seat facing the adjusting member, and the movable seat is axially slidably installed on the fixed seat and circumferentially locked with the fixed seat; the two ends of the adjusting spring respectively abut against the fixed seat and the movable seat, and drive the movable seat to always have a tendency to move away from the fixed seat; the movable seat is provided with a first tooth surface on the end face facing the adjusting member; the adjusting member is provided with a second tooth surface for meshing with the first tooth surface on the end face facing the movable seat.

[0019] By adopting the above technical solution, the cooperation process of the above adjustment assembly and the adjustment member is as follows: the sliding drive assembly moves the adjustment bracket from the end of the slide rail away from the adjustment member to the end close to the adjustment member, so that the first tooth surface and the second tooth surface of the movable seat in the adjustment assembly abut against each other. Since in this process, the first tooth surface and the second tooth surface may not be in a meshing state, at this time, the adjustment motor can be started to rotate the adjustment assembly in one direction by an angle, and then rotated in the opposite direction by the same angle. Under the action of the adjustment spring, the first tooth surface and the second tooth surface can be fully meshed, wherein the above rotation angle is greater than the circumferential angle occupied by each convex tooth of the first tooth surface or the second tooth surface. Due to the meshing of the first tooth surface and the second tooth surface, the circumferential locking of the adjustment assembly and the adjustment member is achieved, so that the adjustment member can be driven to rotate by the adjustment motor. The structural setting of the above adjustment assembly solves the problem of how to achieve circumferential locking of the adjustment assembly and the adjustment member after the adjustment assembly moves from the end of the slide rail away from the adjustment member to the end close to the adjustment member.

[0020] Optionally, the fixed seat is provided with at least two guide holes penetrating along the circumferential direction at the edge; the movable seat is provided with a guide column cooperating with the guide hole, and a limiting nut is also provided at the end of the guide column.

[0021] By adopting the above technical solution, the fixed seat and the movable seat cooperate with each other through the guide hole and the guide column, thereby realizing the functions of circumferential locking and axial sliding cooperation of the fixed seat and the movable seat.

[0022] Optionally, a mounting side plate is installed on the end face of the shell facing the adjusting device, and the mounting side plate is provided with a limiting step hole on the end face facing the shell, and the limiting step hole includes a first limiting hole and a second limiting hole in sequence along the direction away from the shell; the aperture of the first limiting hole is smaller than the aperture of the second limiting hole; and the adjusting member has a limiting convex ring adapted to the first limiting hole.

[0023] By adopting the above technical solution, a rotational mounting structure of the adjusting member at the end of the shell is disclosed, and the rotational mounting structure makes it difficult for the adjusting member to fall off from the mounting side plate, and helps to ensure the coaxiality of the adjusting member and the variable capacitor.

[0024] Optionally, the adjusting member includes an adjusting sleeve and an adjusting knife; the adjusting sleeve is cylindrical and is adapted to the second limiting hole, and the adjusting sleeve is provided with a mounting socket on the end face facing the imaging device for inserting the tail end of the adjusting knife, and the adjusting knife is installed in the mounting socket and circumferentially locked with the adjusting sleeve.

[0025] By adopting the above technical solution, the end of the adjusting member close to the adjusting motor needs to cooperate with the adjusting assembly, which may easily cause the end of the adjusting member close to the adjusting motor to be damaged. Therefore, by dividing the adjusting member into an adjusting sleeve and an adjusting knife, when the adjusting sleeve is damaged, only the adjusting sleeve can be replaced, so that the above magnetic resonance imaging system with variable capacitor can be used normally and the capacitance value of the variable capacitor can be adjusted normally, which helps to reduce maintenance costs.

[0026] Optionally, the mounting side plate is provided with a supporting sleeve on the end surface facing away from the shell for supporting the adjusting sleeve.

[0027] By adopting the above technical solution, the support sleeve is arranged on the outer surface of the adjusting member, so that the adjusting member is not easily offset or misplaced, which helps the adjusting device and the adjusting member to cooperate and reduces the probability of misplacement of the adjusting member during the cooperation process between the adjusting device and the adjusting member.

[0028] Optionally, a mounting sleeve for inserting the variable capacitor is further provided in the housing.

[0029] By adopting the above technical solution, the installation sleeve can position the variable capacitor, so that during the installation process, the first adjustment head of the adjustment member can be more easily inserted into the adjustment slot of the adjustment knob of the variable capacitor.

[0030] In summary, the present application includes at least one of the following beneficial technical effects:

[0031] 1. A nuclear magnetic resonance imaging system, by providing an adjusting member and an adjusting device, enables the capacitance value of a variable capacitor to be adjusted by adjusting a motor, making the adjustment of the capacitance value of the variable capacitor more convenient;

[0032] 2. By providing a sliding drive assembly and a slide rail, the adjustment device can slide on the slide rail, so that when the nuclear magnetic resonance apparatus is started, the adjustment device can be moved out of the detection hole cavity of the nuclear magnetic resonance apparatus, which can reduce the influence of the adjustment device on the imaging of the nuclear magnetic resonance apparatus, so that the imaging of the nuclear magnetic resonance imaging system can be more accurate and the maintenance of the adjustment device is convenient;

[0033] 3. By setting the structure of the adjustment component, the problem of how to achieve circumferential locking of the adjustment component and the adjustment member after the adjustment component moves from one end of the slide rail away from the adjustment member to the end close to the adjustment member is solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the structure of the variable capacitor in this application.

[0035] Figure 2 It is a schematic diagram of the structure of the magnetic resonance imaging system in this application.

[0036] Figure 3 It is a schematic diagram of the structure of the imaging device when the inner ring side plate and the second ring plate are hidden.

[0037] Figure 4 It is a schematic diagram of the structure of the imaging device when the inner ring side plate and the second ring plate are hidden and the PCB board and the variable capacitor are not installed.

[0038] Figure 5 It is a cross-sectional schematic diagram of the imaging device at the first bolt.

[0039] Figure 6 yes Figure 5 A local enlarged schematic diagram of point A in the middle.

[0040] Figure 7 It is a schematic diagram of the exploded structure for installing the side panels and adjusting parts.

[0041] Figure 8 It is a cross-sectional schematic diagram of the imaging device at the adjusting member.

[0042] Fig. 9 yes Figure 8 Enlarged view of point B in the middle.

[0043] Fig.10 It is a schematic diagram of the exploded structure of the regulating part.

[0044] Fig.11 It is a structural diagram of the regulating device.

[0045] Fig.12 It is a cross-sectional schematic diagram of the regulating motor and regulating components.

[0046] Fig.13 It is a schematic diagram of the structure of the regulating motor and regulating components.

[0047] Fig.14 It is a schematic diagram of the structure of the adjusting member at the second tooth surface.

[0048] Description of reference numerals: 1. imaging device; 11. housing; 111. mounting chamber; 112. outer ring side plate; 113. first ring plate; 1131. first threaded hole; 1132. adjustment hole; 114. mounting seat; 1141. mounting groove; 115. mounting sleeve; 1151. notch; 12. PCB board; 13. variable capacitor; 131. adjustment knob; 132. adjustment slot; 14. mounting side plate; 141. first countersunk hole; 142. first bolt; 143. limiting stepped hole; 1431. first limiting hole; 1432. second limiting hole; 144. supporting sleeve; 15. adjusting member; 151. adjusting sleeve; 1511. limiting convex ring; 1512. mounting socket; 1513. limiting groove; 1514. second tooth surface; 15141, second convex tooth; 152, adjusting knife; 1521, first adjusting head; 1522, limiting ring; 1523, limiting convex ridge; 2, adjusting device; 21, bottom rail; 22, supporting bottom plate; 221, bottom groove; 222, slide rail; 223, support; 23, adjusting bracket; 231, slider; 2311, T-shaped slide groove; 232, mounting convex block; 24, adjusting motor; 251, driving screw; 252, screw nut; 253, screw motor; 261, fixed seat; 2611, guide hole; 2612, first spring groove; 2613, first tooth surface; 26131, first convex tooth; 262, movable seat; 2621, guide column; 2622, limiting nut; 2623, second spring groove; 263, adjusting spring. DETAILED DESCRIPTION

[0049] The following is combined with Figure 1-14 This application is described in further detail.

[0050] The present application embodiment discloses a nuclear magnetic resonance imaging system, which is installed in the detection cavity of a nuclear magnetic resonance apparatus. Figure 2 The nuclear magnetic resonance imaging system includes an imaging device 1 and an adjustment device 2.

[0051] Reference Figure 3The imaging device 1 includes a housing 11, an imaging coil, a PCB board 12 and a variable capacitor 13. The housing 11 is a hollow tubular structure and has an installation chamber 111. The imaging coil, the PCB board 12 and the variable capacitor 13 are all arranged in the installation chamber 111.

[0052] The housing 11 mainly includes an inner ring side plate, an outer ring side plate 112, a first ring plate 113 and a second ring plate. The first ring plate 113 and the second ring plate are respectively arranged at both ends of the housing 11. The first ring plate 113 and the second ring plate are both annular and cover the openings at both ends of the installation chamber 111 respectively.

[0053] Reference Figure 3 and Figure 4 Six mounting seats 114 are evenly arranged on the outer ring side wall of the housing 11 in the mounting chamber 111 near the first ring plate 113. The mounting seats 114 are provided with mounting grooves 1141 for mounting the PCB boards 12. There are eight PCB boards 12, and they correspond to the mounting seats 114 one by one. Three variable capacitors 13 are arranged on each PCB board 12, and the axis of the variable capacitor 13 is parallel to the axis of the housing 11.

[0054] Reference Figure 3 and Figure 4 The housing 11 is also provided with a mounting sleeve 115 on the inner side of the first ring plate 113 for inserting and installing the variable capacitor 13. The mounting sleeve 115 is provided with a notch 1151 for partially extending the variable capacitor 13, so as to facilitate the variable capacitor 13 to be welded and fixed on the PCB board 12. In the nuclear magnetic resonance imaging system with the variable capacitor 13 of this embodiment, the PCB board 12 is first installed in the mounting groove 1141 of the mounting seat 114, the variable capacitor 13 is inserted into the mounting sleeve 115, and then the variable capacitor 13 and the PCB board 12 are welded and fixed.

[0055] Reference Figure 2 The housing 11 is provided with a mounting side plate 14 and adjustment members 15 corresponding to the variable capacitors 13 at the end thereof close to the adjustment device 2. In this embodiment, the number of the adjustment members 15 is twenty-four.

[0056] Reference Figure 5 and Figure 6The mounting side plate 14 is annular and is arranged coaxially with the housing 11. The mounting side plate 14 is mounted and fixed on the outer side of the first ring plate 113. The mounting side plate 14 is fixed to the first ring plate 113 by a first bolt 142. Among them, the mounting side plate 14 is provided with a first countersunk hole 141 on the side facing away from the first ring plate 113, and the first ring plate 113 is provided with a first threaded hole 1131 that is opposite to the first countersunk hole 141. The first bolt 142 passes through the first countersunk hole 141 and is threadedly matched with the first threaded hole 1131, so that the mounting side plate 14 is fixed to the first ring plate 113. In this embodiment, the mounting side plate 14 is fixed to the first ring plate 113 by four first bolts 142.

[0057] Reference Figure 7 The mounting side plate 14 has a limit step hole 143 on the end surface facing the housing 11. The limit step hole 143 corresponds to the adjustment hole 1132 one by one. The limit step hole 143 includes a first limit hole 1431 and a second limit hole 1432 in a direction away from the housing 11. The aperture of the first limit hole 1431 is larger than the aperture of the second limit hole 1432.

[0058] Reference Figure 7 The adjusting member 15 includes an adjusting sleeve 151 and an adjusting knife 152. The adjusting sleeve 151 is cylindrical and matches the second limiting hole 1432. The adjusting sleeve 151 is provided with a limiting convex ring 1511 matching the first limiting hole 1431 at the end close to the housing 11. When the adjusting sleeve 151 passes through the limiting stepped hole 143 of the mounting side plate 14, the limiting convex ring 1511 is embedded in the first limiting hole 1431. When the mounting side plate 14 is mounted on the first ring plate 113, the limiting convex ring 1511 fits with the outer side surface of the first ring plate 113.

[0059] Reference Figure 7 The mounting side plate 14 is further provided with a supporting sleeve 144 for supporting the adjusting sleeve 15 on the end surface facing away from the housing 11 .

[0060] Reference Figure 8 and Fig. 9 The adjusting blade 152 is provided with a first adjusting head 1521 adapted to the adjusting slot 132 of the variable capacitor 13. In this embodiment, the first adjusting head 1521 is a straight adjusting head. The housing 11 is provided with an adjusting hole 1132 on the first ring plate 113 for the first adjusting head 1521 to extend into the mounting sleeve 115, so that the first adjusting head 1521 is matched with the adjusting slot 132 of the variable capacitor 13.

[0061] Reference Fig.10The adjusting sleeve 151 is provided with a mounting socket 1512 for inserting the tail end of the adjusting knife 152 on the end surface facing the imaging device 1. The adjusting knife 152 is provided with a limiting ring 1522 in the circumferential direction of the middle part, and four limiting ribs 1523 are evenly arranged in the circumferential direction of the tail end, and the limiting ribs 1523 are parallel to the axial direction of the adjusting knife 152. The mounting socket 1512 is a stepped hole, and the limiting ring 1522 abuts on the stepped surface of the mounting socket 1512. The adjusting sleeve 151 is provided with a limiting groove 1513 for inserting the limiting rib 1523 in the mounting socket 1512, so that after the adjusting sleeve 151 and the adjusting knife 152 are matched, the adjusting sleeve 151 and the adjusting knife 152 can maintain circumferential synchronous rotation.

[0062] Reference Figure 2 The adjusting device 2 includes a bottom rail 21, a supporting bottom plate 22, an adjusting bracket 23 and an adjusting motor 24 mounted on the adjusting bracket 23 and corresponding to the adjusting member 15 one by one.

[0063] Reference Figure 2 The bottom rail 21 is parallel to the axial direction of the housing 11 and can be installed at the bottom of the detection cavity of the nuclear magnetic resonance apparatus. In this embodiment, the bottom rail 21 is provided with countersunk holes spaced apart along its length direction on the top surface so that the bottom rail 21 can be fixed in the detection cavity of the nuclear magnetic resonance apparatus by magnetically compatible screws.

[0064] Reference Figure 2 The support bottom plate 22 is an arc-shaped bottom plate. A bottom groove 221 is provided at the bottom of the support bottom plate 22 to match the bottom rail 21, so that the support bottom plate 22 can slide along the length direction of the bottom rail 21. In this embodiment, the cross section of the bottom rail 21 is T-shaped, and the cross section of the bottom groove 221 is also T-shaped.

[0065] Reference Fig.11 , the support base plate 22 is provided with a slide rail 222 on both sides thereof. The slide rail 222 is parallel to the bottom rail 21. The adjustment bracket 23 is an annular bracket, and both sides of the bottom of the adjustment bracket 23 are provided with sliders 231 that cooperate with the slide rail 222. In this embodiment, the slide rail 222 is a T-shaped slide rail, and the slider 231 is provided with a T-shaped slide groove 2311 that cooperates with the slide rail 222.

[0066] Reference Fig.11 and Fig.12The adjusting device 2 is also provided with a sliding drive assembly for driving the adjusting bracket 23 to slide along the length direction of the slide rail 222. The sliding drive assembly includes a driving screw 251, a screw nut 252 and a screw motor 253. The driving screw 251 is rotatably mounted on one side of the supporting base plate 22, and the supporting base plate 22 is provided with a support 223 for rotatably mounting the driving screw 251. The adjusting bracket 23 has a mounting protrusion 232 for mounting the screw nut 252, wherein the mounting protrusion 232 is integrally provided with the adjacent slider 231. The screw motor 253 is mounted on the supporting base plate 22, and the screw motor 253 is connected to the end of the driving screw 251 away from the imaging device 1, so that the driving screw 251 can rotate to realize that the adjusting bracket 23 can slide along the length direction of the slide rail 222.

[0067] The driving screw 251 and the screw nut 252 are both made of magnetically compatible materials. In this embodiment, the driving screw 251 and the screw nut 252 are made of titanium alloy. The screw motor 253 is a magnetically compatible ultrasonic motor.

[0068] Reference Fig.11 and Fig.12 The adjusting motor 24 also adopts a magnetically compatible ultrasonic motor, and an adjusting component is installed at the end of the output shaft of the adjusting motor 24.

[0069] Reference Fig.12 The adjustment assembly includes a fixed seat 261, a movable seat 262 and an adjustment spring 263. The fixed seat 261 is fixed to the end of the output shaft. The movable seat 262 is located on the side of the fixed seat 261 facing the adjustment member 15, and the movable seat 262 is circumferentially slidably mounted on the fixed seat 261 and circumferentially locked with the fixed seat 261. The adjustment spring 263 is located between the fixed seat 261 and the movable seat 262, and drives the movable seat 262 to always have a tendency to move in a direction away from the fixed seat 261.

[0070] The fixed seat 261 , the movable seat 262 and the adjusting spring 263 are all made of magnetically compatible materials.

[0071] Reference Fig.12 and Fig.13, the fixed seat 261 is provided with six guide holes 2611 axially through the edge. The six guide holes 2611 are evenly arranged in the circumferential direction. The movable seat 262 is provided with a guide column 2621 on the end surface facing the fixed seat 261, which corresponds to the guide hole 2611 one by one and can penetrate the corresponding guide hole 2611. Among them, the guide column 2621 and the guide hole 2611 are matched with clearance to ensure that the guide column 2621 can move axially in the guide hole 2611, and to ensure that the fixed seat 261 and the movable seat 262 are locked circumferentially. A limiting nut 2622 is also provided at the end of the guide column 2621 to prevent the movable seat 262 from detaching from the fixed seat 261.

[0072] The fixed seat 261 has a first spring slot 2612 at the center of the end surface facing the movable seat 262 for mounting the end of the adjustment spring 263. The movable seat 262 has a second spring slot 2623 at the center of the end surface facing the fixed seat 261 for mounting the other end of the adjustment spring 263.

[0073] Reference Fig.13 and Fig.14 , the movable seat 262 is provided with a first tooth surface 2613 on the end surface facing the adjusting member 15. The first tooth surface 2613 is composed of a plurality of first convex teeth 26131 uniformly arranged in the circumferential direction. In the present embodiment, the number of the first convex teeth 26131 in the first tooth surface 2613 is 72. The adjusting sleeve 151 is provided with a second tooth surface 1514 for meshing with the first tooth surface 2613 on the end surface facing the movable seat 262, and the second tooth surface 1514 is composed of a plurality of second convex teeth 15141 cooperating with the first convex teeth 26131. ​​In the present embodiment, the number of the second convex teeth 15141 in the second tooth surface 1514 is also 72.

[0074] Combination Figures 1 to 14The steps of adjusting the capacitance value of the variable capacitor 13 in a nuclear magnetic resonance imaging system of the present application embodiment are as follows: 1. Push the support base plate 22 into the detection cavity of the nuclear magnetic resonance instrument; 2. The sliding drive assembly moves the adjustment bracket 23 from the end of the slide rail 222 away from the imaging device 1 to the end close to the imaging device 1, and makes the first tooth surface 2613 and the second tooth surface 2624 abut against each other. Since the first tooth surface 2613 and the second tooth surface 2624 are not necessarily in a fully meshed state, and the adjustment spring 263 in the adjustment assembly is in a compressed state; 3. The adjustment motor 24 drives the adjustment assembly toward Rotate 5° in one direction, and then rotate 5° in the opposite direction. During this process, under the action of the adjusting spring 263, the first tooth surface 2613 will be fully engaged with the second tooth surface 2624, so that the adjusting component and the adjusting member 15 can be circumferentially locked; 4. Turn on the nuclear magnetic resonance apparatus and the imaging device 1, observe the output image, and adjust the capacitance value of the variable capacitor 13 by adjusting the motor 24, so that the image output by the imaging device 1 is clearer; 5. When the image output by the imaging device 1 meets the requirements, the adjusting bracket 23 is moved out of the detection cavity of the nuclear magnetic resonance apparatus through the sliding drive assembly.

[0075] By adopting the above-mentioned nuclear magnetic resonance imaging system, the adjustment personnel do not need to drill into the detection hole cavity of the nuclear magnetic resonance apparatus, and can adjust the capacitance value of the variable capacitor 13 only through the adjustment device 2, which facilitates the adjustment of the capacitance value of the variable capacitor 13 in the nuclear magnetic resonance imaging system.

[0076] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A magnetic resonance imaging system, characterized in that: The invention comprises an imaging device (1) and an adjusting device (2); the imaging device (1) comprises a housing (11) and a variable capacitor (13) installed in the housing (11); an adjusting member (15) corresponding to the variable capacitor (13) is rotatably installed on the end surface of the housing (11); the adjusting member (15) comprises a first adjusting head (1521) extending into the housing (11) and inserted into an adjusting slot (132) of the variable capacitor (13); the adjusting device (2) comprises an adjusting bracket (23), a first adjusting member (1521) installed on the adjusting bracket, and a second adjusting member (1522) arranged to adjust the variable capacitor (13). An adjusting motor (24) is disposed on the bracket (23) and corresponds one-to-one with the adjusting member (15) and is used to drive the adjusting member (15) to rotate, wherein the adjusting motor (24) is a magnetically compatible ultrasonic motor; the adjusting device (2) comprises a slide rail (222) parallel to the axis of the housing (11) and a sliding drive assembly; the adjusting bracket (23) has a slider (231) capable of sliding on the slide rail (222), and the sliding drive assembly drives the adjusting bracket (23) to slide along the length direction of the slide rail (222).

2. A nuclear magnetic resonance imaging system according to claim 1, characterized in that: The sliding drive assembly comprises a driving screw (251), a screw nut (252) and a screw motor (253); the driving screw (251) is parallel to the slide rail (222); the screw nut (252) is mounted on the adjustment bracket (23) and is adapted to the driving screw (251); the screw motor (253) is mounted at one end of the driving screw (251) away from the housing (11) and drives the driving screw (251) to rotate.

3. A nuclear magnetic resonance imaging system according to claim 2, characterized in that: It also includes a bottom rail (21) and a supporting bottom plate (22) slidably mounted on the bottom rail (21), wherein the supporting bottom plate (22) is an arc-shaped plate; there are two sliding rails (222), which are respectively mounted on both sides of the supporting bottom plate (22); and the driving lead screw (251) is also mounted on one side of the supporting bottom plate (22).

4. A nuclear magnetic resonance imaging system according to claim 1, characterized in that: An adjusting assembly is also mounted on the output shaft of the adjusting motor (24); the adjusting assembly comprises a fixed seat (261), a movable seat (262) and an adjusting spring (263); the fixed seat (261) is fixed to the end of the output shaft; the movable seat (262) is located on a side of the fixed seat (261) facing the adjusting member (15); the movable seat (262) is axially slidably mounted on the fixed seat (261) and circumferentially locked with the fixed seat (261); the adjusting The two ends of the spring (263) are respectively in contact with the fixed seat (261) and the movable seat (262), and drive the movable seat (262) to always have a tendency to move away from the fixed seat (261); the movable seat (262) is provided with a first tooth surface (2613) on the end surface facing the adjusting member (15); the adjusting member (15) is provided with a second tooth surface (1514) on the end surface facing the movable seat (262) for engaging with the first tooth surface (2613).

5. A nuclear magnetic resonance imaging system according to claim 4, characterized in that: The fixed seat (261) is provided with at least two guide holes (2611) penetrating along the circumferential direction at the edge; the movable seat (262) is provided with a guide column (2621) cooperating with the guide hole (2611), and a limiting nut (2622) is also provided at the end of the guide column (2621).

6. A nuclear magnetic resonance imaging system according to claim 1, characterized in that: The shell (11) is provided with a mounting side plate (14) on the end surface facing the adjusting device (2); the mounting side plate (14) is provided with a limiting stepped hole (143) on the end surface facing the shell (11); the limiting stepped hole (143) includes a first limiting hole (1431) and a second limiting hole (1432) in sequence along a direction away from the shell (11); the aperture of the first limiting hole (1431) is smaller than the aperture of the second limiting hole (1432); and the adjusting member (15) has a limiting convex ring (1511) adapted to the first limiting hole (1431).

7. A nuclear magnetic resonance imaging system according to claim 6, characterized in that: The adjusting member (15) comprises an adjusting sleeve (151) and an adjusting knife (152); the adjusting sleeve (151) is cylindrical and matches the second limiting hole (1432); the adjusting sleeve (151) is provided with a mounting socket (1512) on the end surface facing the imaging device (1) for inserting the tail end of the adjusting knife (152); the adjusting knife (152) is mounted in the mounting socket (1512) and is circumferentially locked with the adjusting sleeve (151).

8. A nuclear magnetic resonance imaging system according to claim 7, characterized in that: The mounting side plate (14) is provided with a support sleeve (144) for supporting the adjustment sleeve (151) on the end surface facing away from the housing (11).

9. A nuclear magnetic resonance imaging system according to claim 1, characterized in that: A mounting sleeve (115) for inserting the variable capacitor (13) is also provided in the housing (11).

Images