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CN-121971066-A - Temporomandibular joint dynamic magnetic resonance radio frequency coil capable of adapting to different head types

CN121971066ACN 121971066 ACN121971066 ACN 121971066ACN-121971066-A

Abstract

The invention belongs to the technical field of magnetic resonance, in particular to a temporomandibular joint dynamic magnetic resonance radio frequency coil capable of adapting to different head types, which comprises a magnetic resonance machine body, a fixed coil and a movable coil, wherein a plurality of fixed coils are arranged outside an inner cavity of the magnetic resonance machine body in a surrounding manner, a plurality of movable coils are arranged in the inner cavity of the magnetic resonance machine body in a surrounding manner and are positioned in an inner ring of the fixed coils, each movable coil is positioned between two adjacent fixed coils, the movable coils can move towards the center of the magnetic resonance machine body through a pushing mechanism, the movable coils can be tightly attached to temporomandibular joints of different head types through dynamic adjustment, the signal sensitivity and the image signal-to-noise ratio are effectively improved, the display of fine structures such as a joint disc is clearer, the problem of unstable imaging quality caused by head type and facial contour differences of patients is solved, and consistency and accuracy of diagnosis are ensured.

Inventors

  • SHANG FENG
  • YANG JIAQIANG
  • GU WENHAI

Assignees

  • 凯思轩达医疗科技无锡有限公司
  • 通用环球医疗技术服务(天津)有限公司

Dates

Publication Date
20260505
Application Date
20260123

Claims (10)

  1. 1. The temporomandibular joint dynamic magnetic resonance radio frequency coil adaptable to different head types is characterized by comprising: A magnetic resonance machine body (1); the fixed coils (2) are circumferentially arranged outside the inner cavity of the magnetic resonance machine body (1); The magnetic resonance device comprises a plurality of fixed coils (2), a plurality of movable coils (3), a plurality of pushing mechanisms and a plurality of movable coils (3), wherein the movable coils (3) are arranged in an inner cavity of the magnetic resonance machine body (1) in a surrounding mode and are positioned on inner rings of the fixed coils (2), each movable coil (3) is positioned between two adjacent fixed coils (2), and the movable coils (3) can move towards the center of the magnetic resonance machine body (1) through the pushing mechanisms.
  2. 2. The temporomandibular joint dynamic magnetic resonance radio frequency coil adaptable to different head types of claim 1, wherein the pushing mechanism comprises: The synchronous wheels (4) are rotatably arranged at the end part of the inner cavity of the magnetic resonance machine body (1), the synchronous wheels (4) are positioned between two adjacent fixed coils (2), and the axis of the synchronous wheels (4) is positioned on a connecting line between the central line of the movable coil (3) and the axis of the magnetic resonance machine body (1); the synchronous belt (5) is sleeved on the outer rings of the synchronous wheels (4); The motor (6) is arranged at the bottom of the outer side of the magnetic resonance machine body (1), and the motor (6) is used for driving the bottom synchronous wheel (4) to rotate; the guide rails (7) are fixedly connected to the end part of the inner cavity of the magnetic resonance machine body (1), and the axis of the guide rails (7) is positioned on a connecting line between the central line of the movable coil (3) and the axis of the magnetic resonance machine body (1); the top end of the connecting rod (8) is rotationally connected with the outer ring of the end face of the synchronous wheel (4); The push rod (9) is rotatably connected with the top end of the connecting rod (8), the push rod (9) is slidably arranged in the guide rail (7), and the bottom end of the push rod (9) is connected with the end of the movable coil (3).
  3. 3. The temporomandibular joint dynamic magnetic resonance radio frequency coil adaptable to different head types of claim 2, wherein the pushing mechanism further comprises: the U-shaped frame (10) is fixedly connected to the bottom end of the push rod (9); the MRI compatible air cylinders (11), the two MRI compatible air cylinders (11) are fixedly connected to two sides of the U-shaped frame (10) respectively, and the piston end of the MRI compatible air cylinder (11) is fixedly connected with the end of the movable coil (3).
  4. 4. The temporomandibular joint dynamic magnetic resonance radio frequency coil adaptable to different head types of claim 2, wherein the pushing mechanism further comprises: The laser ranging sensor (12) is fixedly connected to the top of one surface of the guide rail (7) close to the movable coil (3); the reflecting panel (13), the reflecting panel (13) rigid coupling is in the tip top surface of movable coil (3), laser rangefinder sensor (12) with reflecting panel (13) vertical alignment.
  5. 5. The dynamic magnetic resonance radio frequency coil for the temporomandibular joint capable of adapting to different head types is characterized in that the end face of the guide rail (7) is of a C-shaped structure, the opening face of the guide rail (7) is a face far away from the movable coil (3), guide protrusions (14) are fixedly connected to two inner sides of the guide rail (7), guide grooves (15) matched with the guide protrusions (14) are formed in two sides of the push rod (9), and the connecting rod (8) is located on the outer side of the opening face of the guide rail (7).
  6. 6. The dynamic magnetic resonance radio frequency coil capable of adapting to the temporomandibular joints of different head types is characterized in that a rotating shaft (16) is inserted in the middle of the synchronizing wheel (4), a rotating seat is rotatably arranged on an outer ring of one end, far away from the movable coil (3), of the rotating shaft (16), the rotating seat is fixedly connected with the end face of an inner cavity of the magnetic resonance machine body (1), a spline hole (17) is formed in the middle of the rotating shaft (16), a single-head spline rod (18) is inserted in one end, far away from the movable coil (3), of the spline hole (17) at the bottom, the single-head spline rod (18) penetrates through the outer wall of the magnetic resonance machine body (1) in a rotating mode, and one end, far away from the magnetic resonance machine body (1), of the single-head spline rod (18) is fixedly connected with the output end of the motor (6).
  7. 7. The dynamic magnetic resonance radio frequency coil for the temporomandibular joint, which can be adapted to different head types, is characterized in that pushing mechanisms are symmetrically arranged at two ends of an inner cavity of the magnetic resonance machine body (1), a double-head spline rod (19) is arranged between two corresponding synchronous wheels (4) at two sides, and two ends of the double-head spline rod (19) are respectively meshed and spliced with the spline holes (17) at two sides.
  8. 8. The dynamic magnetic resonance radio frequency coil for the temporomandibular joint capable of adapting to different head types according to claim 2 is characterized in that an anti-drop block (20) for preventing the synchronous belt (5) from dropping is arranged on one side of the synchronous wheel (4) away from the center of the magnetic resonance machine body (1), the anti-drop block (20) is fixedly connected with the end face of an inner cavity of the magnetic resonance machine body (1), and the anti-drop block (20) is in sliding contact with the outer ring of the synchronous wheel (4).
  9. 9. The dynamic magnetic resonance radio frequency coil capable of adapting to the temporomandibular joints with different head types is characterized in that an inner groove is formed in the middle of one surface of the anti-drop block (20) close to the synchronous wheel (4), a U-shaped plate (21) is slidably arranged in the inner groove, a roller (22) is rotatably arranged in the U-shaped plate (21), the outer ring of the roller (22) is in sliding contact with the outer wall of the synchronous belt (5), a screw (23) is rotatably arranged in the middle of one surface of the U-shaped plate (21) far away from the synchronous wheel (4), and the screw (23) penetrates through the anti-drop block (20) and is in threaded fit with the anti-drop block (20).
  10. 10. The dynamic magnetic resonance radio frequency coil for the temporomandibular joint capable of adapting to different head types according to claim 9 is characterized in that limiting sliding grooves (24) are formed in two sides of an inner groove of the anti-drop block (20), and limiting sliding blocks (25) which are in sliding fit with the limiting sliding grooves (24) are fixedly connected to two sides of the U-shaped plate (21).

Description

Temporomandibular joint dynamic magnetic resonance radio frequency coil capable of adapting to different head types Technical Field The invention belongs to the technical field of magnetic resonance, and particularly relates to a temporomandibular joint dynamic magnetic resonance radio frequency coil capable of adapting to different head types. Background The RF coil in the magnetic resonance imaging system is a core component for realizing signal excitation and reception, and completes RF pulse transmission and MR signal reception through an electromagnetic induction principle, the RF coil has strong signals in a coil area, but the signal sensitivity can be obviously reduced along with the increase of the distance, and the performance parameters of the RF coil such as signal-to-noise ratio, uniformity and sensitivity directly determine the image quality, and the design of the RF coil needs to adapt to the imaging requirements of different anatomical parts. In the current process of carrying out dynamic magnetic resonance examination on the temporomandibular joint, the teeth of a patient are required to be positioned at different occlusion positions by manual control or auxiliary mouth opening devices, each position is repeatedly scanned, and finally, a moving dynamic image of the temporomandibular joint is formed by continuously displaying images of different time phases; However, the existing radio frequency coil has the characteristic that the obvious sensitivity decreases along with the increase of the distance, and the head shape, the facial outline and the temporomandibular joint anatomical position of different patients are different, so that the distance between the fixedly installed coil and the temporomandibular joint of the patient cannot be flexibly adjusted, the optimal distance between the fixedly installed coil and the temporomandibular joint of different patients is difficult to maintain, when the distance between the coil and the joint is incorrect, the signal sensitivity decreases, the signal-to-noise ratio of the image decreases, and the accuracy of the evaluation on the position, the shape and the movement range of the joint disc is further affected. For this purpose, the invention provides a temporomandibular joint dynamic magnetic resonance radio frequency coil which can adapt to different head types. Disclosure of Invention In order to overcome the deficiencies of the prior art, at least one technical problem presented in the background art is solved. The technical scheme adopted by the invention for solving the technical problems is that the temporomandibular joint dynamic magnetic resonance radio frequency coil capable of adapting to different head types comprises: A magnetic resonance machine body; the fixed coils are circumferentially arranged outside the inner cavity of the magnetic resonance machine body; The movable coils are arranged in the inner cavity of the magnetic resonance machine body in a surrounding mode and are positioned on inner rings of the fixed coils, each movable coil is positioned between two adjacent fixed coils, and the movable coils can move towards the center of the magnetic resonance machine body through the pushing mechanism. Preferably, the pushing mechanism includes: The synchronous wheels are rotatably arranged at the end part of the inner cavity of the magnetic resonance machine body, the synchronous wheels are positioned between two adjacent fixed coils, and the axis of each synchronous wheel is positioned on a connecting line between the central line of the movable coil and the axis of the magnetic resonance machine body; the synchronous belt is sleeved on the outer rings of the synchronous wheels; the motor is arranged at the bottom of the outer side of the magnetic resonance machine body and is used for driving the synchronous wheel at the bottom to rotate; The guide rails are fixedly connected to the end part of the inner cavity of the magnetic resonance machine body, and the axes of the guide rails are positioned on a connecting line between the central line of the movable coil and the axis of the magnetic resonance machine body; The top end of the connecting rod is rotationally connected with the outer ring of the end face of the synchronous wheel; the top end of the push rod is rotationally connected with the bottom end of the connecting rod, the push rod is slidably arranged in the guide rail, and the bottom end of the push rod is connected with the end part of the movable coil. Preferably, the pushing mechanism further comprises: the U-shaped frame is fixedly connected to the bottom end of the push rod; The two MRI compatible air cylinders are fixedly connected to two sides of the U-shaped frame respectively, and the piston end of the MRI compatible air cylinder is fixedly connected with the end of the movable coil. Preferably, the pushing mechanism further comprises: the laser ranging sensor is fixedly connected to the top of one surface o