MRI (Magnetic Resonance Imaging) image-guided radiotherapy equipment

Abstract

The utility model discloses an MRI (Magnetic Resonance Imaging) image-guided radiotherapy device, which comprises an MRI image mechanism, a treatment head mechanism and a treatment bed mechanism, the MRI image mechanism comprises a magnetizer and a magnetic pole, a mounting cavity is formed in the middle of the magnetizer, and the treatment head mechanism is arranged in the mounting cavity; the treatment bed mechanism is connected with the magnetizer and can rotate relative to the magnetizer, and movement of a treatment position can be achieved through rotation, so that treatment of different parts of the head is achieved, and after a human body is imaged, treatment can be conducted through a TPS treatment plan. The equipment is ingenious and reasonable in structural design and small in occupied area, real integration of an imaging mechanism and a radiotherapy mechanism is achieved, secondary fixation on a patient is eliminated through positioning and treatment integration, and the treatment efficiency and treatment precision are higher.

Description

Technical Field

[0001] The utility model relates to the technical field of radiotherapy equipment, in particular to a radiotherapy equipment guided by MRI images. Background Art

[0002] The radiosurgery treatment system is a large-scale device that integrates stereotactic technology and radiosurgery technology, mainly used to treat tumor lesions. It has the advantages of no surgery and less damage.

[0003] Traditional radiotherapy equipment generally requires the patient to be positioned before treatment, and then images are taken using imaging equipment such as CT or MRI. A treatment plan is made based on these images, and then the patient returns to the treatment room to confirm that the positioning is complete before treatment begins. Existing radiotherapy equipment of this type generally has independent imaging equipment and radiotherapy equipment, which will cause secondary positioning errors when used. With the development of technology, radiotherapy equipment that integrates imaging and treatment has also appeared in the existing technology, but these existing radiotherapy equipment still have not achieved the true integration of imaging mechanisms, treatment mechanisms and patient treatment beds. In addition, for radiotherapy equipment, due to the natural radioactivity of rays, this also puts higher shielding requirements on radiotherapy equipment. Utility Model Content

[0004] In order to solve the above technical problems, the present invention provides an MRI (magnetic resonance imaging) image-guided radiotherapy device with an ingenious and reasonable structural design, a small footprint and an excellent shielding effect. The device integrates the MRI imaging mechanism and the treatment head mechanism into one device. After the patient is positioned, MRI imaging and radiotherapy are completed in one go, reducing secondary positioning errors. The emergency power-off mechanism of the present design is on the side of the device, and the operating mechanism is exposed. It only requires directly rotating the handle, which is simple, safe and reliable to operate. The device includes an MRI imaging mechanism, a treatment head mechanism and a treatment bed mechanism; the MRI imaging mechanism includes a magnet and a magnetic pole, and an installation cavity is formed in the middle of the magnet, and the treatment head mechanism is arranged in the installation cavity; the treatment bed mechanism is connected to the magnet and can rotate relative to the magnet. The treatment position can be moved by rotation, thereby achieving treatment of different parts of the head.

[0005] Preferably, the magnetic pole includes an upper magnetic pole and a lower magnetic pole, and an imaging area is formed between the upper magnetic pole and the lower magnetic pole;

[0006] The magnetic conductor includes a magnetic base, the lower magnetic pole is arranged on the magnetic base, a turntable mechanism is installed on the magnetic base, and the treatment bed mechanism is installed through the turntable mechanism.

[0007] Preferably: a shielding mechanism is provided outside the installation cavity, and the shielding mechanism is installed on the magnetic conductor;

[0008] In an emergency, the shielding mechanism is operated to adjust the shielding mechanism to a closed state.

[0009] Preferably: the treatment head mechanism includes a collimator mechanism, a radiation source assembly, a source switch and an electric switch source mechanism;

[0010] The collimator mechanism includes a collimator, an active switch is provided inside the collimator, and the radiation source assembly is installed on the source switch. During treatment, the rays emitted by the radiation source pass through the collimation hole of the collimator and are focused on the outside of the magnetic conductor to form an irradiation center. During non-treatment, the electric switch source mechanism drives the source switch to turn the radiation source assembly away from the collimator, so that the radiation source is in a shielded state.

[0011] Preferably: the electric switch source mechanism includes a source switch and a rotating mechanism, a radiation source is provided in the source switch, the source switch itself has a shielding function, the source switch is connected to the rotating mechanism, and the source switch is driven to rotate by the rotating mechanism to realize the treatment state and the non-treatment state.

[0012] Preferably, the radiation source is a natural isotope radiation source.

[0013] Preferably, the shielding mechanism includes a shielding door, which is slidably connected to the magnetic conductor;

[0014] The platform shielding door is also connected to a driving mechanism for driving the platform shielding door to move.

[0015] Preferably, the driving mechanism includes a screen door motor and a screen door screw, and the screen door screw is connected to the screen door;

[0016] The shielding door motor drives the shielding door screw rod to drive the shielding door to move so that the installation cavity is in a closed state.

[0017] Preferably, the screen door motor is a servo motor without a brake;

[0018] The shield door screw is a self-locking T-shaped thread, and the shield door screw is connected to the reducer and the handwheel through a pulley;

[0019] In an emergency, the screen door screw is driven by the hand wheel to rotate and drive the screen door to move to a closed state.

[0020] Preferably, it also includes a source-changing mechanism, which is installed on the magnetic conductor, and the magnetic conductor is provided with a through hole corresponding to the source-changing mechanism;

[0021] The source-changing mechanism includes a block and a shielding plug. In the non-treatment state, the axis of the shielding plug is concentric with the radiation source assembly. By removing the shielding plug, the radiation source assembly can be taken out using a tool. The source-changing mechanism is used to replace the radiation source.

[0022] The technical effects and advantages of this utility model are:

[0023] 1. The utility model device completes imaging and treatment in the same device, truly integrating the MRI imaging mechanism, the treatment head mechanism and the treatment bed mechanism. The human body is moved to the treatment area through the treatment bed mechanism for treatment in one go, realizing the integration of positioning treatment, eliminating the secondary fixation of the patient, and improving the treatment efficiency and accuracy.

[0024] 2. The device of the present invention includes three major mechanisms: an MRI imaging mechanism, a treatment head mechanism, and a treatment bed mechanism. The middle part of the magnetic conductor of the MRI imaging mechanism forms an installation cavity for installing the treatment head mechanism. The treatment head mechanism is installed in this installation cavity, so that the magnetic conductor of the MRI imaging mechanism also serves as a radiation shielding body, which is beneficial to shielding radiotherapy rays on the one hand, and reduces the volume of the device on the other hand.

[0025] 3. In the present utility model, the treatment bed mechanism is connected to the magnetic conductor of the MRI imaging mechanism and can rotate relative to the magnetic conductor. This device has an ingenious and reasonable structural design, occupies a small area, and realizes the true integration of the imaging mechanism and the radiotherapy mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural diagram of the device provided in the embodiment of the present application;

[0027] Figure 2 is a cross-sectional view of the device provided in an embodiment of the present application as viewed from above;

[0028] Figure 3 The device provided in the embodiment of the present application Figure 2 A schematic diagram of the structure at center A;

[0029] Figure 4 The device provided in the embodiment of the present application Figure 2 A magnified schematic diagram of the structure at point B in the middle;

[0030] Figure 5 It is a structural schematic diagram of the rotating mechanism in the device provided in the embodiment of the present application;

[0031] Figure 6 is a structural diagram of the treatment bed mechanism in the device provided in an embodiment of the present application;

[0032] Figure 7 is a front view of the device provided in an embodiment of the present application;

[0033] Figure 8 This is a left view of the device provided in an embodiment of the present application.

[0034] In the figure: 1. Treatment head mechanism; 11. Magnetizer; 12. Upper magnetic pole; 13. Lower magnetic pole; 101. Bearing; 102. Outer cylinder; 103. Outer cylinder cover; 104. Inner cover; 105. Motor; 106. First small gear; 107. First large gear; 108. Source switch; 109. Cavity; 1091. Source change hole; 110. Radiation source; 111. Collimator; 1111. Adjusting screw; 1112. Support plate screw nut; 1113. Collimating hole; 112. Switch source motor; 113. Small pulley; 114. Small bearing; 115. Large pulley; 116. Stopper; 117. Shielding plug; 118. Hexagonal head; 119. Pass Hole; 2. Treatment bed mechanism; 201. Large bearing; 202. Second large gear; 203. Second small gear; 204. Rotating motor; 205. Rotating frame; 206. Lifting assembly; 207. Lifting frame; 208. Rotating drive assembly; 209. Drive assembly; 210. Base; 211. Slide; 212. Treatment bed body; 3. Shielding mechanism; 301. Shielding door motor; 302. Pulley synchronous belt; 303. Shielding door screw nut; 304. Shielding door; 305. Reducer; 306. Handwheel; 307. Shielding door screw; 3071. First pulley; 3072. Second pulley; 308. Guide rail; 309. Shielding block. DETAILED DESCRIPTION

[0035] The present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments. The embodiments of the present invention are provided for purposes of illustration and description and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations will be apparent to those skilled in the art. The embodiments are selected and described to better illustrate the principles and practical applications of the present invention and to enable those skilled in the art to understand the present invention and design various embodiments with various modifications suitable for specific applications.

[0036] In this embodiment, an MRI-guided radiotherapy device is provided, comprising an MRI imaging mechanism, a treatment head mechanism, and a treatment couch mechanism. The MRI imaging mechanism includes a magnet 11 and magnetic poles. A mounting cavity is formed in the center of the magnet 11, and the treatment head mechanism is disposed within the mounting cavity. The treatment couch mechanism is connected to the magnet 11 and can rotate relative to the magnet 11. This rotation allows the treatment position to be moved, thereby enabling treatment of different parts of the head. Imaging and treatment are achieved within the same device, and the treatment couch mechanism 2 is used to move the patient to the treatment area for treatment. This achieves integrated positioning and treatment, eliminates secondary fixation of the patient, and improves treatment efficiency and accuracy.

[0037] Furthermore, the magnet 11 is provided with a mounting hole corresponding to the treatment head mechanism 1, and the magnetic poles include an upper magnetic pole 12 and a lower magnetic pole 13, and an imaging area is formed between the upper magnetic pole 12 and the lower magnetic pole 13; the magnet 11 includes a magnetic base, and the lower magnetic pole 13 is provided on the magnetic base, and a turntable mechanism is installed on the magnetic base, and the treatment bed mechanism is installed through the turntable mechanism.

[0038] Specifically, the turntable structure includes a large bearing 201 installed at the lower part of the lower magnetic pole 13 of the magnetizer 11, the large bearing 201 is connected to the second large gear 202, the second large gear 202 is fixed to the rotating frame 205, the second large gear 202 can rotate through the large bearing 201, the second large gear 202 is engaged with the second small gear 203, the second small gear 203 is connected to the rotating motor 204, the rotating motor 204 drives the second small gear 203 to rotate, and drives the second large gear 202 and the rotating frame 205 to rotate, and the treatment bed mechanism is driven to move by the turntable mechanism. The treatment bed mechanism, the magnetizer 11, and the treatment head mechanism 1 are integrated into one, which reduces the footprint and can reduce the cost of the treatment bed in the existing technology. At the same time, it also improves the accuracy and time efficiency of the treatment bed reaching the treatment position during treatment.

[0039] Furthermore, a shielding mechanism 3 is provided outside the installation cavity and is mounted on the magnetic conductor 11. In an emergency, the shielding mechanism 3 is operated to adjust the shielding mechanism 3 to a closed state. In a treatment scenario, the shielding mechanism is open relative to the cavity; in a non-treatment scenario, the shielding mechanism is closed relative to the cavity. This means that by adjusting the position of the shielding mechanism, different effects can be automatically achieved in treatment scenarios, non-treatment scenarios, and emergency situations, without the need for other mechanisms or manual position adjustment. This improves treatment efficiency while also reducing radiation damage to the human body.

[0040] Specifically, the shielding mechanism 3 includes a shielding door 304, which is also connected to a driving mechanism for driving the shielding door 304 to move; it also includes a shielding door motor 301 and a shielding door screw 307. The shielding door screw 307 is a self-locking T-shaped thread. When the shielding door screw 307 is stationary, it can support the slider and prevent the shielding door screw nut 303 from moving downward under the action of gravity.

[0041] The shielding door 304 is slidably connected to the magnetic conductor 11; and a shielding block 309 is installed on the shielding door 304; a slider is connected to the rear end of the shielding door 304, and the slider is slidably connected to the guide rail 308, and the guide rail 308 is installed on the equipment. A shielding door screw nut 303 is fixed to the side end of the shielding door 304, and the shielding door screw nut 303 is connected to the shielding door screw 307, and the shielding door screw 307 is installed on the equipment through a bearing and a bearing seat.

[0042] Furthermore, the driving mechanism includes a screen door motor 301 and a lead screw, and the lead screw is connected to the screen door 304; the screen door motor 301 drives the lead screw to move the screen door to achieve a closed state of the installation cavity.

[0043] Specifically, the upper end of the shielding door screw rod 307 is fixedly connected to the first pulley 3071. Two first pulleys 3071 are provided. The two first pulleys 3071 are connected by a pulley synchronous belt 302. The other first pulley 3071 is connected to the shielding door motor 301. The shielding door motor 301 is installed on the equipment through a bracket. The shielding door motor 301 drives the first pulley 3071 to rotate, and drives the shielding door screw rod 307 to rotate through the pulley synchronous belt 302, so that the shielding door screw rod nut 303 moves along the shielding door screw rod 307, thereby driving the shielding door 304 to move up and down.

[0044] Furthermore, the shielding door motor 301 is a servo motor without a brake; the screw is a self-locking T-shaped thread, and the screw is connected to the reducer 305 and the handwheel 306 through a pulley; in an emergency, the handwheel 306 drives the screw to rotate and drive the shielding door 304 to move to a closed state.

[0045] Specifically, the lower end of the shielding door screw rod 307 is fixedly connected to the second pulley 3072. There are two second pulleys 3072. The two second pulleys 3072 are connected by the pulley synchronous belt 302. The other second pulley 3072 is connected to the reducer 305. The reducer 305 is connected to the handwheel 306.

[0046] Furthermore, the shielding door motor 301 is a servo motor without a brake, and the shielding door motor 301 does not need to be installed with a brake mechanism. When the shielding door motor 301 stops, the second pulley 3072 is driven to rotate by turning the handwheel 306, driving the shielding door screw 307 to rotate, so that the shielding door screw nut 303 moves along the shielding door screw 307, and then drives the shielding door 304 to move up and down. In an emergency, when manually closing the shielding block 309, there is no need to release the motor brake first, the operation is simpler, and the operation time is saved. The shielding block 309 switch transmission screw adopts a self-locking mechanism, and the motor does not need a brake. When manually closing the shielding block 309, there is no need to release the motor brake first, the operation is simpler, and the manual emergency power off time is saved. During treatment, the shielding block 309 moves to the bottom of the collimator mechanism 14, leaking out of the collimator mechanism 14. When shutting off the source, operate the shielding mechanism 3 to move the shielding block 309 to the front of the collimator mechanism 14 to achieve manual power off.

[0047] Furthermore, the treatment head mechanism 1 includes a collimator mechanism, a radiation source assembly, a source switch 108 and an electric switch source mechanism;

[0048] The collimator mechanism includes a collimator 111, an active switch 108 is provided inside the collimator 111, and the radiation source assembly is installed on the source switch 108. During treatment, the radiation emitted by the radiation source 110 passes through the collimation hole 1113 of the collimator 111 and is focused on the outside of the magnetic conductor 11 to form an irradiation center. During non-treatment, the electric switch source mechanism drives the source switch 108 to turn the radiation source assembly away from the collimator 111, so that the radiation source 110 is in a shielded state.

[0049] Specifically, the collimator mechanism 14 includes a collimator 111, a radiation source 110 is provided inside the collimator 111, a plurality of collimators 111 are provided, and the plurality of collimators 111 are mounted on a support plate 1114. The radiation of the radiation source 110 passes through the collimation hole 1113 of the collimator 111 to form a treatment area outside the magnet 11. The radiation source 110 is placed in the box body, and the side wall of the support plate 1114 is connected to the slider, and the slider is connected to the slide rail, and the slide rail is fixed to the cavity 109. The side wall of the support plate 1114 is also fixedly connected to the support plate screw nut 1112. The support plate screw nut 1112 is connected to the adjusting screw 1111, and the adjusting screw 1111 is installed on the outer cylinder 102 through the screw bracket. The adjusting screw 1111 is connected to the motor, and the motor drives the adjusting screw 1111 to rotate, so that the support plate screw nut 1112 moves up and down, driving the support plate 1114 to move up and down, which can adjust the height of the collimator 111, and then facilitate the adjustment of the center of the treatment area. A plurality of collimating holes 1113 are provided on the collimator 111, and the rays of the radiation source 110 are arranged in a fan shape and gathered in the center of the treatment area.

[0050] Furthermore, four collimators 111 are provided, and a support frame is provided between the upper two collimators 111 and the lower two collimators 111 . The support frame is fixed on the support plate 1114 , and the motor drives the adjustment screw 1111 to rotate, thereby realizing the movement of the support plate 1114 and adjusting different collimators 111 .

[0051] Furthermore, small bearings 114 are provided at both ends of the source switch 108 , and the source switch 108 is rotatably connected to the cavity 109 via the small bearings 114 .

[0052] Furthermore, the electric switch source mechanism includes a large pulley 115, a small pulley 113 and a switch source motor 112. The large pulley 115 is fixedly connected to the source switch 108. The large pulley 115 is connected to the small pulley 113 through a synchronous belt. The small pulley 113 is connected to the switch source motor 112, and the switch source motor 112 is fixed on the inner cover 104. The switch source motor 112 can move with the cavity 109, so that the shutdown shielding position of the radiation source 110 is different from the treatment working position, which can reduce the source loading amount of the radiation source 110.

[0053] Furthermore, the electric switch source mechanism includes a source switch 108 and a rotating mechanism. A radiation source is provided in the source switch 108. The source switch 108 itself has a shielding function. The source switch 108 is connected to the rotating mechanism, and the source switch 108 is driven to rotate by the rotating mechanism to realize the treatment state and the non-treatment state.

[0054] The electric switch source mechanism includes a source switch 108, and a radiation source 110 is installed on the source switch 108. A groove structure is opened on the side wall of the source switch 108 corresponding to the box body for placing the box body. The source switch 108 is rotated to connect the cavity 109. The source switch 108 is connected to the rotating mechanism, and the rotating mechanism is fixed on the cavity 109. The source switch 108 is driven by the rotating mechanism. During treatment, the radiation source 110 is close to the treatment center, which is conducive to improving the dose rate at the treatment center. During shielding, the radiation source 110 is far away from the treatment center, which can effectively reduce the thickness of the shielding body.

[0055] The cavity 109 is installed in the outer cylinder 102, and a source change hole 1091 is opened on the side of the cavity 109 close to the through hole 119. The outer cylinder cover 103 is provided at both ends of the outer cylinder 102. The outer cylinder cover 103 located before the cavity 109 and the stopper 116 is provided with a through hole that matches the source change hole 1091. Preferably, the diameter of the through hole on the outer cylinder cover 103 is the same as the diameter of the source change hole 1091. The two ends of the cavity 109 are rotatably connected to the outer cylinder cover 103 through the bearing 101. The outer cylinder 102 is connected to the inner cover 104, and the inner cover 104 is used to be clamped in the cavity. At the inner end of 109, the inner cover 104 is connected to the first large gear 107 through a rotating shaft, the first large gear 107 engages with the first small gear 106, and the first small gear 106 is connected to the motor 105. The motor 105 is fixed on the magnet 11. Starting the motor 105 drives the first small gear 106 to rotate, drives the first large gear 107 to rotate, and drives the first large gear 107, the inner cover 104, the cavity 109 and the radiation source 110 to rotate, which is used to adjust the horizontal angle of the radiation source 110 to achieve focusing of the radiation source 110 to the center of the treatment area from different directions.

[0056] Furthermore, the radiation source 110 uses a natural isotope radiation source, preferably Co60.

[0057] Furthermore, it also includes a source switching mechanism, which is installed on the magnetic conductor 11, and the magnetic conductor 11 is provided with a through hole corresponding to the source switching mechanism;

[0058] The source replacement mechanism includes a stopper 116 and a shielding plug 117. In the non-treatment state, the axis of the shielding plug 117 is concentric with the radiation source assembly. By removing the shielding plug 117, the radiation source assembly can be taken out using a tool. The source replacement mechanism is used to replace the radiation source.

[0059] Specifically, a through hole 119 is opened on the side wall of the magnetic conductor 11 facing the source switch 108 , a stopper 116 is installed at the through hole 119 , a shielding plug 117 is installed on the stopper 116 , and a plug hole is opened on the stopper 116 corresponding to the shielding plug 117 .

[0060] When replacing the source, a hexagonal head 118 is provided on the side wall of the source switch 108 near the shielding plug 117. The hexagonal head 118 is centrally arranged with the plug hole. When removing the shielding plug 117, an inner hexagonal tool can be inserted from the plug hole and connected to the hexagonal head 118. Rotating the inner hexagonal tool can drive the source switch 108 to rotate, so that the radiation source 110 rotates to the side away from the shielding block 309, thereby realizing manual source shutdown, facilitating replacement of the radiation source 110, and avoiding radiation exposure to the staff caused by replacing the radiation source 110.

[0061] In one embodiment, see Figure 1 As shown, in this embodiment, an MRI image-guided radiotherapy device is provided, which includes an MRI imaging mechanism, a treatment head mechanism, and a treatment couch mechanism. The MRI imaging mechanism includes a magnet 11 and magnetic poles. The magnet 11 has a mounting cavity formed in the middle thereof, and the treatment head mechanism is disposed in the mounting cavity. The treatment couch mechanism is connected to the magnet 11 and can rotate relative to the magnet 11. The rotation can move the treatment position, thereby achieving treatment of different parts of the head.

[0062] See Figure 1 、 Figure 6 As shown, in this embodiment, the magnetizer 11 is provided with a mounting hole corresponding to the treatment head mechanism 1, and the magnetic poles include an upper magnetic pole 12 and a lower magnetic pole 13, and an imaging area is formed between the upper magnetic pole 12 and the lower magnetic pole 13; the magnetizer 11 includes a magnetic base, and the lower magnetic pole 13 is provided on the magnetic base. A turntable mechanism is installed on the magnetic base, and the treatment bed mechanism is installed through the turntable mechanism. A shielding mechanism 3 is provided outside the mounting cavity, and the shielding mechanism is installed on the magnetizer 11.

[0063] The turntable structure includes a large bearing 201 installed at the lower part of the lower magnetic pole 13 of the magnetizer 11. The large bearing 201 is connected to the second large gear 202. The second large gear 202 is fixed on the rotating frame 205. The second large gear 202 can rotate through the large bearing 201. The second large gear 202 engages with the second small gear 203. The second small gear 203 is connected to the rotating motor 204. The rotating motor 204 drives the second small gear 203 to rotate, driving the second large gear 202 and the rotating frame 205 to rotate.

[0064] See Figure 2 、 Figure 3 and Figure 4 As shown, in this embodiment, the treatment head mechanism 1 includes a collimator mechanism, a radiation source assembly, a source switch 108 and an electric switch source mechanism.

[0065] The collimator mechanism 14 includes a collimator 111, a radiation source 110 is arranged inside the collimator 111, a plurality of collimators 111 are provided, and the plurality of collimators 111 are mounted on a support plate 1114. The radiation of the radiation source 110 passes through the collimation hole 1113 of the collimator 111 to form a treatment area outside the magnet 11. The radiation source 110 is placed in the box body, and the side wall of the support plate 1114 is connected to the slider, and the slider is connected to the slide rail, and the slide rail is fixed on the cavity 109. The side wall of the support plate 1114 is also fixedly connected to the support plate screw nut 1112. The plate screw nut 1112 is connected to the adjusting screw 1111, and the adjusting screw 1111 is installed on the outer cylinder 102 through the screw bracket. The adjusting screw 1111 is connected to the motor, and the motor drives the adjusting screw 1111 to rotate, so that the support plate screw nut 1112 moves up and down, driving the support plate 1114 to move up and down, which can adjust the height of the collimator 111, and thus facilitate the adjustment of the center of the treatment area. A plurality of collimating holes 1113 are provided on the collimator 111, and the rays of the radiation source 110 are arranged in a fan shape and gathered in the center of the treatment area.

[0066] Specifically, four collimators 111 are provided, and a support frame is provided between the upper two collimators 111 and the lower two collimators 111 . The support frame is fixed on the support plate 1114 . The motor drives the adjustment screw 1111 to rotate, thereby realizing the movement of the support plate 1114 and adjusting different collimators 111 .

[0067] Furthermore, small bearings 114 are provided at both ends of the source switch 108 , and the source switch 108 is rotatably connected to the cavity 109 via the small bearings 114 .

[0068] The driving mechanism includes a large pulley 115, a small pulley 113 and a switch source motor 112. The large pulley 115 is fixedly connected to the source switch 108. The large pulley 115 is connected to the small pulley 113 through a synchronous belt. The small pulley 113 is connected to the switch source motor 112, and the switch source motor 112 is fixed on the inner cover 104. The switch source motor 112 can move with the cavity 109, so that the shutdown shielding position of the radiation source is different from the treatment working position, which can reduce the amount of radiation source installed.

[0069] See Figure 5 As shown, the electric switch source mechanism includes a source switch 108, and a radiation source 110 is installed on the source switch 108. A groove structure is provided on the side wall of the source switch 108 corresponding to the box body for placing the box body. The source switch 108 is rotatably connected to the cavity 109. The source switch 108 is connected to the rotating mechanism, and the rotating mechanism is fixed on the cavity 109. The source switch 108 is driven by the rotating mechanism. During treatment, the radiation source 110 is close to the treatment center, which is beneficial to improving the dose rate at the treatment center. During shielding, the radiation source 110 is far away from the treatment center, which can effectively reduce the thickness of the shielding body.

[0070] The cavity 109 is installed in the outer cylinder 102, and a source change hole 1091 is opened on the side of the cavity 109 close to the through hole 119. The outer cylinder cover 103 is provided at both ends of the outer cylinder 102. The outer cylinder cover 103 located before the cavity 109 and the stopper 116 is provided with a through hole that matches the source change hole 1091. Preferably, the diameter of the through hole on the outer cylinder cover 103 is the same as the diameter of the source change hole 1091. The two ends of the cavity 109 are rotatably connected to the outer cylinder cover 103 through the bearing 101. The outer cylinder 102 is connected to the inner cover 104, and the inner cover 104 is used to be clamped in the cavity. At the inner end of 109, the inner cover 104 is connected to the first large gear 107 through a rotating shaft, the first large gear 107 engages with the first small gear 106, and the first small gear 106 is connected to the motor 105. The motor 105 is fixed on the magnet 11. Starting the motor 105 drives the first small gear 106 to rotate, drives the first large gear 107 to rotate, and drives the first large gear 107, the inner cover 104, the cavity 109 and the radiation source 110 to rotate, which is used to adjust the horizontal angle of the radiation source 110 to achieve focusing of the radiation source 110 to the center of the treatment area from different directions.

[0071] When the power is turned off, the switch source motor 112 drives the small pulley 113 and the large pulley 115 to rotate, so that the source switch 108 rotates 180 degrees from the side close to the shielding block 309 to the side away from the shielding block 309, further completing the power off.

[0072] Furthermore, a through hole 119 is formed on the side wall of the magnetic conductor 11 facing the source switch 108 . A stopper 116 is installed at the through hole 119 . A shielding plug 117 is installed on the stopper 116 . A plug hole is formed on the stopper 116 corresponding to the shielding plug 117 .

[0073] When replacing the source, a hexagonal head 118 is provided on the side wall of the source switch 108 near the shielding plug 117. The hexagonal head 118 is centrally arranged with the plug hole. When removing the shielding plug 117, an inner hexagonal tool can be inserted from the plug hole and connected to the hexagonal head 118. Rotating the inner hexagonal tool can drive the source switch 108 to rotate, so that the radiation source 110 rotates to the side away from the shielding block 309, thereby realizing manual source shutdown, facilitating replacement of the radiation source 110, and avoiding radiation exposure to the staff caused by replacing the radiation source 110.

[0074] See Figure 1 and 6As shown, the treatment bed mechanism 2 includes a treatment bed body 212, and a slide 211 is installed at the bottom end of the treatment bed body 212. The slide 211 is connected to the drive assembly 209, and the drive assembly 209 is installed in the base 210. The slide 211 is slidably connected to the base 210. In this embodiment, the drive assembly 209 includes a motor, a lead screw and a lead screw nut. The lead screw nut is fixed to the slide 211. The motor drives the lead screw to rotate, and the lead screw nut drives the slide 211 to move along the base 210. The horizontal position of the treatment bed body 212 can be adjusted to facilitate the human head to enter the imaging area or treatment area.

[0075] Furthermore, the lower end of the base 210 is connected to the rotation drive assembly 208, and the rotation drive assembly 208 is fixed to the lifting frame 207. In this embodiment, the rotation drive assembly 208 includes a motor, which is used to drive the base 210 to rotate so that the treatment bed body 212 can rotate. The lifting frame 207 is connected to the lifting assembly 206. The lifting assembly 206 can use electric or pneumatic means to drive the lifting frame 207 to rise and fall. The lifting assembly 206 is fixed to the rotating frame 205, and the rotating frame 205 rotates along the lower part of the lower magnetic pole 13.

[0076] Specifically, the rotary motor 204 drives the second small gear 203 to rotate, which in turn drives the second large gear 202 and the rotating frame 205 to rotate, so that the treatment bed body 212 can revolve along the lower magnetic pole 13, making it easy to adjust the angle at which the treatment bed body 212 enters the imaging area or the treatment area.

[0077] See Figure 1 、 Figure 7 and Figure 8 As shown, the shielding mechanism 3 includes a shielding door 304, a shielding block 309 is installed on the shielding door 304, a slider is connected to the rear end of the shielding door 304, the slider is slidably connected to the guide rail 308, the guide rail 308 is installed on the equipment, and a shielding door screw nut 303 is fixed to the side end of the shielding door 304, the shielding door screw nut 303 is connected to the shielding door screw 307, and the shielding door screw 307 is installed on the equipment through bearings and bearing seats, and the bearings and bearing seats are not shown in the figure.

[0078] The shielding mechanism 3 drives the shielding door 304 to move up and down, and includes a shielding door motor 301 and a shielding door screw 307. The shielding door screw 307 is a self-locking T-shaped thread. When the shielding door screw 307 is stationary, it can support the slider and prevent the shielding door screw nut 303 from moving downward under the action of gravity.

[0079] Furthermore, the upper end of the shielding door screw 307 is fixedly connected to the first pulley 3071. Two first pulleys 3071 are provided. The two first pulleys 3071 are connected by a pulley synchronous belt 302. The other first pulley 3071 is connected to the shielding door motor 301. The shielding door motor 301 is installed on the equipment through a bracket. The shielding door motor 301 drives the first pulley 3071 to rotate, and drives the shielding door screw 307 to rotate through the pulley synchronous belt 302, so that the shielding door screw nut 303 moves along the shielding door screw 307, thereby driving the shielding door 304 to move up and down.

[0080] Furthermore, the lower end of the shielding door screw rod 307 is fixedly connected to the second pulley 3072. There are two second pulleys 3072. The two second pulleys 3072 are connected by the pulley synchronous belt 302. The other second pulley 3072 is connected to the reducer 305, and the reducer 305 is connected to the handwheel 306.

[0081] In this embodiment, the shielding door motor 301 is a servo motor without a brake, and the shielding door motor 301 does not need to be installed with a brake mechanism. When the shielding door motor 301 stops, the second pulley 3072 is driven to rotate by rotating the handwheel 306, driving the shielding door screw 307 to rotate, so that the shielding door screw nut 303 moves along the shielding door screw 307, and then drives the shielding door 304 to move up and down. In an emergency, when manually closing the shielding block 309, there is no need to release the motor brake first, which simplifies the operation and saves operation time. The shielding block 309 switch transmission screw adopts a self-locking mechanism, and the motor does not need a brake. When manually closing the shielding block 309, there is no need to release the motor brake first, which simplifies the operation and saves manual emergency power off time. During treatment, the shielding block 309 moves to the bottom of the collimator mechanism 14, leaking out of the collimator mechanism 14. When shutting off the power, the shielding mechanism 3 is operated to move the shielding block 309 to the front of the collimator mechanism 14 to achieve manual power off.

[0082] If a sudden fault occurs during treatment and the power cannot be turned off automatically, it is necessary to turn it off manually.

[0083] Step 1: Manually close the shielding door 304. During treatment, the shielding door 304 is located below the treatment area. Manually rotate the hand wheel 306 to drive the shielding door screw 307 to rotate, so that the shielding door 304 rises and blocks the radiation source 110.

[0084] Step 2: Remove the shielding plug 117, insert the hexagonal tool for manual power off into the plug hole, cooperate with the hexagonal head 118, rotate the hexagonal tool to drive the power switch 108 to rotate 180 degrees, and the treatment head mechanism 1 is in the shielded state of power off, and the staff can enter the treatment room.

[0085] Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field and related fields without making any creative efforts should fall within the scope of protection of the present invention. Structures, devices, and operating methods not specifically described and explained in this utility model shall be implemented in accordance with conventional means in the field unless otherwise specified or limited.

Claims

1. An MRI image-guided radiotherapy device, characterized in that: Including MRI imaging mechanism, treatment head mechanism and treatment bed mechanism; The MRI imaging mechanism includes a magnet and a magnetic pole, a mounting cavity is formed in the middle of the magnet, and the treatment head mechanism is arranged in the mounting cavity; The treatment bed mechanism is connected to the magnet and can rotate relative to the magnet. The treatment position can be moved by rotation, thereby achieving treatment of different parts of the head.

2. The device according to claim 1, characterized in that The magnetic poles include an upper magnetic pole and a lower magnetic pole, and an imaging area is formed between the upper magnetic pole and the lower magnetic pole; The magnetic conductor includes a magnetic base, the lower magnetic pole is arranged on the magnetic base, a turntable mechanism is installed on the magnetic base, and the treatment bed mechanism is installed through the turntable mechanism.

3. The device according to claim 2, characterized in that A shielding mechanism is provided outside the installation cavity, and the shielding mechanism is installed on the magnetic conductor; In an emergency, the shielding mechanism is operated to adjust the shielding mechanism to a closed state.

4. The device according to claim 2, characterized in that The treatment head mechanism includes a collimator mechanism, a radiation source assembly, a source switch and an electric switch source mechanism; The collimator mechanism includes a collimator, an active switch is provided inside the collimator, and the radiation source assembly is installed on the source switch. During treatment, the rays emitted by the radiation source pass through the collimation hole of the collimator and are focused on the outside of the magnetic conductor to form an irradiation center. During non-treatment, the electric switch source mechanism drives the source switch to turn the radiation source assembly away from the collimator, so that the radiation source is in a shielded state.

5. The device according to claim 4, characterized in that The electric switch source mechanism includes a source switch and a rotating mechanism. A radiation source is provided in the source switch. The source switch itself has a shielding function. The source switch is connected to the rotating mechanism. The rotating mechanism drives the source switch to rotate to realize the treatment state and the non-treatment state.

6. The device according to claim 4 or 5, characterized in that The ray source is a natural isotope radioactive source.

7. The device according to claim 3, characterized in that The shielding mechanism includes a shielding door, which is slidably connected to the magnetic conductor; The platform shielding door is also connected to a driving mechanism for driving the platform shielding door to move.

8. The device according to claim 7, characterized in that The driving mechanism includes a screen door motor and a screen door screw, and the screen door screw is connected to the screen door; The shielding door motor drives the shielding door screw rod to drive the shielding door to move so that the installation cavity is in a closed state.

9. The device according to claim 8, characterized in that The screen door motor is a servo motor without a brake; The shield door screw is a self-locking T-shaped thread, and the shield door screw is connected to the reducer and the handwheel through a pulley; In an emergency, the screen door screw is driven by the hand wheel to rotate and drive the screen door to move to a closed state.

10. The device according to claim 1, characterized in that It also includes a source-changing mechanism, which is installed on the magnetic conductor, and the magnetic conductor is provided with a through hole corresponding to the source-changing mechanism; The source-changing mechanism includes a block and a shielding plug. In the non-treatment state, the axis of the shielding plug is concentric with the radiation source assembly. By removing the shielding plug, the radiation source assembly can be taken out using a tool. The source-changing mechanism is used to replace the radiation source.

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