Treatment head and control method thereof

Abstract

The present application discloses a treatment head and a control method thereof, belonging to the field of medical device technology. The treatment head includes: a radiation source, a tungsten gate assembly and a multi-leaf collimator. When the treatment head is used to treat a tumor, the blade body in the multi-leaf collimator needs to move along the second direction. After each blade body moves along the second direction, each blade body in the two groups of blades performs beam shaping on the radiation beam emitted by the radiation source, so that the beam-shaped radiation beam is irradiated only on the patient's tumor as much as possible. When the blade body in a group of blades needs to move along the second direction, and the horizontal distance between the target blade body in a group of blades and the central axis of the radiation beam is less than or equal to the upper limit value of the preset range, the first driving structure in the tungsten gate assembly also drives the blocking body corresponding to the blade body to move along the moving direction of the blade body, and then the blocking body can block the rays emitted by the radiation source toward the tail of the blade body.

Description

Technical Field

[0001] The present application relates to the technical field of medical devices, and in particular to a treatment head and a control method thereof. Background Art

[0002] Radiotherapy is an important means of treating cancer, and radiotherapy equipment (abbreviated as radiotherapy equipment) is a key medical device for carrying out radiotherapy. Among them, the treatment head is an important component of radiotherapy equipment.

[0003] At present, in order to reduce the size of the treatment head, the device used to block the radiation beam emitted by the radiation source in the treatment head usually only includes a multileaf collimator (full name: Multileaf Collimator, abbreviated as: MLC) and an aperture. Among them, the aperture can block the radiation beam emitted by the radiation source in one direction, and the MLC can block the radiation beam emitted by the radiation source in another direction through two sets of leaves arranged therein, so that the radiation beam emitted by the radiation source can form a rounded square radiation field at the maximum on the isocenter plane.

[0004] However, when the two groups of blades in the MLC move toward each other to form radiation fields of different shapes, leakage occurs at the tail of the blade (that is, the end connected to the driving structure that drives the blade to move), resulting in lower safety in the use of the treatment head. Summary of the invention

[0005] The embodiment of the present application provides a treatment head and a control method, which can solve the problem of leakage at the tail of the blade in the prior art. The technical solution is as follows:

[0006] In one aspect, a treatment head is provided, the treatment head comprising:

[0007] a radioactive source for emitting a radiation beam;

[0008] The tungsten door assembly comprises: two blocking bodies arranged opposite to each other, and a first driving structure respectively connected to the two blocking bodies;

[0009] A multi-leaf collimator located on the side of the tungsten gate assembly away from the radiation source, the multi-leaf collimator comprising: a box body, and two sets of leaves arranged opposite to each other in the box body, each set of leaves comprising: a plurality of leaf bodies stacked and arranged along a first direction, each of the leaf bodies being capable of moving along a second direction perpendicular to the first direction;

[0010] Wherein, the two blocking bodies correspond to the two groups of blades one by one, and the arrangement direction of the two blocking bodies is the same as the arrangement direction of the two groups of blades;

[0011] The first driving structure is configured to: when the horizontal distance between a target blade body in a group of blades and the central axis of the radiation beam is less than or equal to the upper limit value of a preset range, drive the corresponding blocking body to move along the moving direction of the target blade body to block part of the rays in the radiation beam, and the emission direction of the rays in the radiation beam blocked by the blocking body is toward the tail of the blade body, and the target blade body is the blade body in the group of blades with the smallest horizontal distance from the central axis of the radiation beam.

[0012] Optionally, the first driving structure is specifically configured as follows:

[0013] If the horizontal distance between the target blade body and the central axis of the radiation beam is within the preset range, driving the corresponding blocking body to move along the moving direction of the target blade body so that part of the blocking body is located within the radiation beam and part of the blocking body is located outside the radiation beam;

[0014] If the horizontal distance between the target blade body and the central axis of the radiation beam is less than the lower limit of the preset range, the corresponding blocking body is driven to move into the radiation beam, and at least part of the edge rays in the radiation beam can be blocked by the blocking body.

[0015] Optionally, a distance that the blocking body moves along the moving direction of the target blade body is positively correlated with a distance that the target blade body moves.

[0016] Optionally, the first driving structure is further configured to: when the horizontal distance between the target blade body and the central axis of the radiation beam is greater than an upper limit value of the preset range, drive the corresponding blocking body to move outside the radiation beam.

[0017] Optionally, the first driving structure includes a double-layer driving structure disposed opposite to each other, and the double-layer driving structure disposed opposite to each other drives the two blocking bodies respectively.

[0018] Optionally, each layer of the driving structure includes: a driving mechanism and a driving motor, the driving mechanism is connected to the blocking body and to the driving motor, and the driving motor is configured to: drive the blocking body to move along the moving direction of the target blade body through the driving mechanism.

[0019] Optionally, each group of blades further includes: a second driving structure connected to the plurality of blade bodies in a one-to-one correspondence, and each of the second driving structures is configured to: drive the corresponding blade body to move along the second direction.

[0020] Optionally, the treatment head further includes: an aperture located between the tungsten gate assembly and the multi-leaf collimator, the aperture including: two aperture bodies arranged opposite to each other, and an arrangement direction of the two aperture bodies is perpendicular to an arrangement direction of the two blocking bodies.

[0021] Optionally, the treatment head further comprises: a mounting seat, a side surface of the mounting seat having a mounting opening;

[0022] The tungsten door assembly further includes: a base, the two blocking bodies and the first driving structure are both mounted on the base, and the base is detachably connected to the mounting seat through the mounting opening.

[0023] On the other hand, a control method of a treatment head is provided, wherein the treatment head is any of the treatment heads given above, and the control method of the treatment head comprises:

[0024] When the horizontal distance between the target blade body in a group of blades and the central axis of the radiation beam is less than or equal to the upper limit value of a preset range, the corresponding blocking body is driven by the first driving structure to move along the moving direction of the target blade body to block part of the rays in the radiation beam.

[0025] The beneficial effects brought by the technical solution provided by the embodiment of the present application include at least:

[0026] A treatment head includes: a radiation source, a tungsten gate assembly and a multi-leaf collimator. When the treatment head in the present application is used to treat a tumor, the blade bodies in the two groups of blades in the multi-leaf collimator need to move along the second direction. After each blade body moves along the second direction, each blade body in the two groups of blades can shape the radiation beam emitted by the radiation source, so that the beam-shaped radiation beam is irradiated only on the patient's tumor as much as possible. When the blade body in a group of blades needs to move along the second direction, and the horizontal distance between the target blade body in a group of blades and the central axis of the radiation beam is less than or equal to the upper limit value of the preset range, the first driving structure in the tungsten gate assembly also drives the blocking body corresponding to the blade body to move along the moving direction of the blade body, and then the blocking body can block the rays emitted by the radiation source toward the tail of the blade body. That is, the blocking body can prevent the undesirable phenomenon of radiation leakage from the tail of the blade body when the corresponding blade body moves to form a field of different shapes, effectively improving the safety of the treatment head. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 This is a front view of a treatment head provided in an embodiment of the present application;

[0029] Figure 2 yes Figure 1 A side view of the treatment head is shown;

[0030] Figure 3 This is a rendering of an effect of a blocking body moving to shield the tail of a blade body provided by an embodiment of the present application;

[0031] Figure 4 This is a rendering of another blocking body provided in an embodiment of the present application to shield the tail of the blade body;

[0032] Figure 5 This is a rendering of another blocking body provided in an embodiment of the present application to shield the tail of the blade body;

[0033] Figure 6 is a side view of another treatment head provided in an embodiment of the present application;

[0034] Figure 7 is a front view of another treatment head provided in an embodiment of the present application;

[0035] Figure 8 It is a schematic diagram of the installation of a mounting base and a tungsten door assembly provided in an embodiment of the present application.

[0036] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0037] In order to make the objectives, technical solutions and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below with reference to the accompanying drawings.

[0038] Please refer to Figure 1 and Figure 2 , Figure 1 is a front view of a treatment head provided in an embodiment of the present application, Figure 2 yes Figure 1The treatment head 000 may include: a radiation source 100 , a tungsten door assembly 200 , and a multi-leaf collimator 300 .

[0039] The radiation source 100 in the treatment head 000 can be used to emit a radiation beam. For example, the radiation source 100 can be an accelerator tube, which is used to accelerate electrons and output a high-energy beam for target shooting. The radiation source 100 can emit a radiation beam along a third direction z, that is, the central axis of the radiation beam is parallel to the third direction z.

[0040] The tungsten door assembly 200 in the treatment head 000 may include: two blocking bodies 201 arranged opposite to each other, and a first driving structure 202 respectively connected to the two blocking bodies 201 .

[0041] The multi-leaf collimator 300 in the treatment head 000 may be located on the side of the tungsten door assembly 200 away from the radiation source 100 . The multi-leaf collimator 300 may include: a housing (not shown) and two sets of leaves 301 oppositely disposed in the housing.

[0042] In the present application, the multi-leaf collimator 300 can generally be mounted on a mounting plate (not shown in the figure) in the treatment head 000. For example, the box in the multi-leaf collimator 300 can be slidably connected to a support plate, and the support plate has a radiation hole for the radiation rays to pass through. In this way, the radiation rays emitted by the treatment head 000 can pass through the radiation through hole and then be emitted to the two sets of leaves 301 in the multi-leaf collimator 300.

[0043] Each group of blades 301 in the multi-leaf collimator 300 may include: a plurality of blade bodies 3011 stacked and arranged along a first direction x, and each blade body 3011 in each group of blades can move along a second direction y perpendicular to the first direction x, so that the two groups of blades 301 arranged opposite to each other can form field areas of different shapes. It should be noted that the second direction y is parallel to the extension direction of the blade body 3011. Among them, the two blocking bodies 201 in the tungsten gate assembly 200 can correspond one-to-one to the two groups of blades 301 arranged opposite to each other in the multi-leaf collimator 300, and the arrangement direction of the two blocking bodies 201 is the same as the arrangement direction of the two groups of blades 301. In the present application, the two blocking bodies 201 and the two groups of blades 301 are arranged in the second direction y, and the second direction y is not only perpendicular to the first direction x, but also perpendicular to the third direction z.

[0044] The first driving structure 202 in the tungsten gate assembly 200 can be configured to: when the target blade body in one of the two groups of blades 301 moves along the second direction y, and the horizontal distance between the target blade body and the central axis of the radiation beam is less than or equal to the upper limit of the preset range, drive the corresponding blocking body 201 to move along the moving direction of the target blade body to block part of the radiation beam emitted by the radiation source 100. It should be noted that if the corresponding blocking body 201 is outside the radiation beam, the blocking body 201 does not need to move, and at this time the blocking body 201 will not interfere with the field of the blade body 3011.

[0045] The rays blocked by the blocking body 201 in the radiation beam are emitted in a direction toward the tail of the blade body 3011 in a group of blades corresponding to the blocking body 201. The target blade body may be a blade body in a group of blades with the smallest horizontal distance from the central axis of the radiation beam.

[0046] It should be noted that the tail of the blade body 3011 in one of the two groups of blades 301 refers to the end of the blade body 3011 away from the other group of blades 301. The horizontal distance between the target blade body and the central axis of the radiation beam refers to the minimum distance between the head of the target blade body and the central axis of the radiation beam in the second direction y. Here, the head and tail of the blade body 3011 are the two ends of the blade body 3011, respectively.

[0047] For examples, please refer to Figure 3 , Figure 3This is a rendering of a blocking body provided in an embodiment of the present application moving to shield the tail of the blade body. When the treatment head 000 in the present application is used to treat a tumor, the blade bodies 3011 in the two groups of blades 301 in the multi-leaf collimator 300 need to move along the second direction y. After each blade body 3011 moves along the second direction y, each blade body 3011 in the two groups of blades 301 can shape the radiation beam emitted by the radiation source 100 so that the shaped radiation beam is irradiated only on the patient's tumor as much as possible. When the blade body 3011 in a group of blades 301 needs to move along the second direction y, and the horizontal distance between the target blade body in a group of blades 301 and the central axis of the radiation beam is less than or equal to the upper limit of the preset range, the first driving structure 202 in the tungsten door assembly 200 also drives the blocking body 201 corresponding to the blade body 3011 to move along the moving direction of the blade body 3011, and then the blocking body 201 can block the rays emitted by the radiation source 100 toward the tail of the blade body 3011. That is, the blocking body 201 can prevent the undesirable phenomenon of radiation leakage from the tail of the blade body 3011 when the corresponding blade body 3011 moves to form a radiation field of different shapes, effectively improving the safety of the treatment head 000.

[0048] It should be noted that the basic structure and motion principle of the two blocking bodies 201 in the tungsten gate assembly 200 are the same, and the basic structure and motion principle of the two groups of blades 301 in the multi-leaf collimator 300 are also the same. Therefore, in the embodiment of the present application, the structure and motion principle of another blocking body 201 and another group of blades 301 can refer to the above description of one blocking body 201 and one group of blades 301, and will not be repeated here.

[0049] It should also be noted that since the blocking body 201 in the embodiment of the present application is only used to block the leakage radiation from the tail of the blade body 3011, and the dose of the leakage radiation from the tail of the blade body 301 is usually not too large. Therefore, the volume of the blocking body 201 will not be too large, and the volume of the blocking body 201 can be much smaller than the volume of the aperture body in the aperture. For this reason, the additional tungsten gate assembly 200 added to the treatment head 000 in the embodiment of the present application does not have a significant impact on the overall volume of the treatment head 000. In this way, the volume of the treatment head 000 can be kept small while ensuring that the tail of the blade body 3011 in the treatment head 000 does not leak radiation.

[0050] In summary, the embodiment of the present application provides a treatment head, including: a radiation source, a tungsten gate assembly and a multi-leaf collimator. When the treatment head of the present application is used to treat a tumor, the blade bodies of the two groups of blades in the multi-leaf collimator need to move along the second direction. After each blade body moves along the second direction, each blade body in the two groups of blades can shape the radiation beam emitted by the radiation source, so that the beam-shaped radiation beam is irradiated only on the patient's tumor as much as possible. When the blade body in a group of blades needs to move along the second direction, and the horizontal distance between the target blade body in a group of blades and the central axis of the radiation beam is less than or equal to the upper limit value of the preset range, the first driving structure in the tungsten gate assembly also drives the blocking body corresponding to the blade body to move along the moving direction of the blade body, and then the blocking body can block the rays emitted by the radiation source toward the tail of the blade body. That is, the blocking body can prevent the undesirable phenomenon of ray leakage from the tail of the blade body when the corresponding blade body moves to form a field of different shapes, effectively improving the safety of the treatment head.

[0051] In the embodiment of the present application, there are three optional implementation methods for the process in which the blade body 3011 in each set of blades shapes the radiation emitted by the radiation source 100 and the blocking body 201 in the tungsten door assembly 200 moves along the moving direction of the blade body 3011:

[0052] In a first optional implementation, the first driving structure 202 in the tungsten gate assembly 200 can also be configured as follows: after a target blade body in a group of blades 301 moves along the second direction y, if the horizontal distance between the target blade body and the central axis of the radiation beam emitted by the radiation source 100 is within a preset range, the corresponding blocking body 201 is driven to move along the moving direction of the target blade body, so that part of the blocking body 201 can be located within the radiation beam and part of it can be located outside the radiation beam.

[0053] In this case, when the distance between the target blade body and the central axis of the radiation beam emitted by the radiation source 100 is within the preset range, the first driving structure 202 in the tungsten door assembly 200 drives the corresponding blocking body 201 to move to the specified position, so that part of the blocking body 201 is located in the radiation beam and part is located outside the radiation beam, so that the blocking body 201 can block the tail of the blade body 3011 in the group of blades to prevent the undesirable phenomenon of radiation leakage from the tail of the blade body 3011. For example, the radiation beam emitted by the radiation source 100 in the treatment head 000 in the embodiment of the present application can form a rounded square field of 400×400 mm at the maximum on the isocenter plane, and the value of the preset range can be 118.4 mm to 200 mm.

[0054] In the embodiment of the present application, the distance that the blocking body 201 corresponding to the target blade body moves along the moving direction of the target blade body is positively correlated with the distance that the target blade body moves. In the present application, in the process of the target blade body moving from the initial position to the final position along the second direction y, the greater the distance that the target blade body moves, the greater the probability that the tail of the target blade body leaks radiation. For this reason, the volume of the corresponding blocking body 201 extending into the radiation beam is also larger, so as to fully shield the leakage radiation from the tail of the target blade body, that is, the greater the distance that the first driving structure 202 needs to drive the corresponding blocking body 201 to move. Conversely, the smaller the distance that the target blade body moves, the smaller the distance that the first driving structure 202 needs to drive the corresponding blocking body 201 to move.

[0055] For the second optional implementation, please refer to Figure 4 , Figure 4 2 is an effect diagram of another blocking body provided in an embodiment of the present application to block the tail of the blade body. The first driving structure 202 in the tungsten door assembly 200 can also be configured as follows: after the target blade body in a group of blades 301 moves along the second direction y, if the horizontal distance d between the target blade body and the central axis of the radiation beam emitted by the radiation source 100 is outside the preset range and is greater than the upper limit of the preset range, the corresponding blocking body 201 is driven to move outside the radiation beam.

[0056] In one possible situation, when the distance between the target blade body and the central axis of the radiation beam is outside the preset range and the value of the distance is greater than the upper limit value of the preset range, if the corresponding blocking body 201 is located outside the radiation beam, the blocking body 201 does not need to be moved, and at this time the blocking body 201 will not interfere with the field of view of the blade body 3011.

[0057] In another possible situation, when the distance between the target blade body and the central axis of the radiation beam is outside the preset range and the value of the distance is greater than the upper limit of the preset range, if the corresponding blocking body 201 is located in the radiation beam, the first driving structure 202 needs to drive the blocking body 201 to move outside the radiation beam to avoid interfering with the field of view of the blade body 3011.

[0058] For example, when the radiation beam emitted by the radiation source 100 in the treatment head can form a rounded square radiation field of a maximum size of 400×400 mm on the isocenter plane, and the preset range is 118.4 mm to 200 mm, the horizontal distance d between the target blade body and the central axis of the radiation beam emitted by the radiation source 100 is greater than the upper limit of the preset range of 200 mm.

[0059] For the third optional implementation, please refer to Figure 5 , Figure 5This is another effect diagram of a blocking body shielding the tail of a blade body provided by an embodiment of the present application. The first driving structure 202 in the tungsten gate assembly 200 can also be configured as follows: after the target blade body in a group of blades 301 moves along the second direction y, if the horizontal distance d between the target blade body and the central axis of the radiation beam emitted by the radiation source 100 is outside the preset range and is less than the lower limit of the preset range. Then the corresponding blocking body 201 can be driven to move into the radiation beam emitted by the radiation source 100, and at least part of the edge rays in the radiation beam can be shielded by the blocking body 201 corresponding to the target blade body.

[0060] In a possible case, when the distance between the target blade body and the central axis of the radiation beam is outside the preset range, and the value of the distance is less than the lower limit of the preset range, if the corresponding blocking body 201 is outside the radiation beam, the first driving structure 202 needs to drive the blocking body 201 to move into the radiation beam, so that the blocking body 201 can block part of the radiation beam. That is, the blocking body 201 can block the radiation beam toward the tail of the blade body 3011 in the radiation beam.

[0061] In another possible case, when the distance between the target blade body and the central axis of the radiation beam is outside the preset range, and the value of the distance is less than the lower limit of the preset range, if the corresponding blocking body 201 is located in the radiation beam, there is no need to move the blocking body 201. For example, when the radiation beam emitted by the radiation source 100 in the treatment head 000 can form a rounded square radiation field of 400×400 mm at the maximum on the isocenter plane, and the preset range is 118.4 mm to 200 mm, the horizontal distance d between the target blade body and the central axis of the radiation beam emitted by the radiation source 100 is less than the lower limit of the preset range of 118.4 mm.

[0062] Optionally, the first driving structure 202 in the tungsten door assembly 200 may include: two driving structures arranged in double layers opposite to each other, and the driving structures arranged in double layers opposite to each other may be used to drive two blocking bodies 201 respectively. In this case, by arranging two driving structures with larger volumes in double layers opposite to each other, that is, arranging the two layers of driving structures in a stacked manner along the propagation direction of the radiation beam, the space utilization rate in the treatment head can be improved, and the total volume of the treatment head can be reduced. In addition, it is convenient to install the treatment head in the medical accelerator, thereby improving the user experience.

[0063] Optional, please refer to Figure 6 , Figure 6: is a side view of another treatment head provided in an embodiment of the present application. Each layer of the driving structure in the tungsten door assembly 200 may include: a driving mechanism and a driving motor, and the driving mechanism may be connected to the blocking body 201 and may be connected to the driving motor. Among them, the driving motor in the first driving structure 202 may be configured to: drive the blocking body 201 to move along the moving direction of the target blade body corresponding to the blocking body 201 through the driving mechanism. For example, take one of the two driving mechanisms, the driving motor connected to the driving mechanism in the two driving motors, and the blocking body 201 connected to the driving mechanism in the two blocking bodies 201 as an example. When the blocking body 201 needs to move in the direction of movement of the corresponding blade body 3011, the driving motor drives the blocking body 201 to move through the driving mechanism, so that the blocking body 201 can block the tail of the blade body 3011 to prevent the tail of the blade body 3011 from leaking. For example, the driving mechanism may include: a lead screw and a lead screw nut (not shown in the figure), the lead screw nut may be sleeved on the lead screw, the blocking body 201 may be connected to the lead screw nut, and the output shaft of the driving motor is connected to the lead screw. When the output shaft of the driving motor rotates, the lead screw may be driven to rotate, so that the lead screw nut drives the blocking body 201 to move along the length direction of the lead screw. It should be noted that the length direction of the lead screw may be parallel to the moving direction of the blocking body 201.

[0064] It should also be noted that the basic structural components and motion principles of the two drive motors, the two drive mechanisms, and the two blocking bodies can be the same. Therefore, in the embodiment of the present application, the motion principle of another drive motor driving another blocking body through another drive mechanism can refer to the above description of one drive motor driving one blocking body 201 through one drive mechanism, and will not be repeated here.

[0065] In the embodiment of the present application, the first driving structure 202 may further include an encoder (not shown in the figure), the encoder is connected to the output shaft of the driving motor (not shown in the figure), and the encoder is used to rotate under the drive of the output shaft of the driving motor, so as to realize the detection function of the output shaft. Through the detection result, the real-time rotation number of the output shaft of the driving motor 202 can be known, so as to know the theoretical movement distance of the driving mechanism connected to the blocking body 201 according to the real-time rotation number, and compare the theoretical movement distance with the actual movement distance of the driving mechanism, thereby feeding back whether the first driving structure 202 has a fault, and ensuring the effective output of the first driving structure 202.

[0066] In the examples of this application, please refer to Figure 7 , Figure 7It is a front view of another treatment head provided in an embodiment of the present application. Each group of blades in the two groups of blades 301 may also include: a second drive structure 3012 connected to a plurality of blade bodies 3011 in the group of blades in a one-to-one correspondence. Among them, each of the second drive structures 3012 may be configured to: drive the blade body 3011 corresponding to the second drive structure 3012 to move along the second direction y. For example, the second drive structure 3012 may include: a blade drive motor (not shown in the figure), and a transmission structure (not shown in the figure) connected to the blade drive motor, and the transmission structure may also be connected to the blade body 3011. The blade drive motor may drive the blade body 3011 to move along the second direction y through the transmission structure. It should be noted that the transmission structure may be a screw nut transmission structure.

[0067] Optional, such as Figure 6 and Figure 7 As shown, the treatment head 000 may also include: an aperture 400, which is located between the tungsten gate assembly 200 and the multi-leaf collimator 300. The aperture 400 may include: two aperture bodies 401 arranged opposite to each other, and the arrangement direction of the two aperture bodies 401 arranged opposite to each other may be perpendicular to the arrangement direction of the two blocking bodies 201 in the tungsten gate assembly 200, that is, the two aperture bodies 401 are arranged along the first direction x. In this case, the radiation beam emitted by the radiation source 100 can be shaped in the first direction x through the aperture body 401. Then, the treatment head 000 forms a radiation field that is substantially consistent with the shape of the tumor on the patient plane through the joint action of the two blocking bodies 201 arranged opposite to each other, the two aperture bodies 401 arranged opposite to each other, and the two sets of leaves 301 arranged opposite to each other, so as to irradiate the tumor.

[0068] In the embodiment of the present application, the multi-leaf collimator 300 may further include: a box driving assembly (not shown in the figure). The box driving assembly may be connected to the box, and the box driving assembly is used to drive the box to move in the second direction y. When the number of boxes in the multi-leaf collimator 300 is two, the number of the box driving assemblies is also two, and the two box driving assemblies are connected to the two boxes in a one-to-one correspondence, and each box driving assembly can drive the corresponding box to move in the second direction y.

[0069] For example, each box driving assembly can drive the corresponding box to move along the extension direction of the slide rail (that is, the second direction y). In this way, under the joint drive of the box driving assembly and the second driving structure 3012, the two groups of relatively arranged leaves 301 in the multi-leaf collimator 300 can quickly form a radiation field area, effectively improving the efficiency of changing the field of the multi-leaf collimator 300.

[0070] For example, each box driving assembly may include: a box driving motor, a lead screw connected to the box driving motor, and a nut connected to the lead screw. The extension direction of the lead screw in each box driving assembly may be the same as the extension direction of the slide rail, and the nut in each box driving assembly may be fixedly connected to the corresponding box. In this way, when the box driving motor drives the lead screw to rotate, the nut may move along the extension direction of the lead screw, thereby driving the box to move along the extension direction of the slide rail.

[0071] Optionally, the multi-leaf collimator 300 may further include: two driving circuit boards (not shown in the figure) corresponding to the two boxes one by one, each driving circuit board may be electrically connected to the second driving structure 3012 of the blade body 3011 in the corresponding box. The moving distance and moving direction of each blade body 3011 in the corresponding box may be controlled by the driving circuit board.

[0072] In the examples of this application, please refer to Figure 8 , Figure 8 It is a schematic diagram of the installation of a mounting base and a tungsten door assembly provided in an embodiment of the present application. The treatment head 000 may also include: a mounting base 500, and the side of the mounting base 500 may have a mounting port 501. The tungsten door assembly 200 in the treatment head may also include: a base 203, and the two blocking bodies 201 and the first driving structure 202 in the tungsten door assembly 200 may be mounted on the base 203, and the base 203 may be detachably connected to the mounting base 500 through the mounting port 501 on the mounting base 500. In this case, by removing the base 203 from the mounting port 501 on the side of the mounting base 500 in the treatment head, the tungsten door assembly 200 can be repaired more conveniently, which effectively reduces the maintenance difficulty of the treatment head and improves the user experience.

[0073] In summary, the embodiment of the present application provides a treatment head, including: a radiation source, a tungsten gate assembly and a multi-leaf collimator. When the treatment head of the present application is used to treat a tumor, the blade bodies of the two groups of blades in the multi-leaf collimator need to move along the second direction. After each blade body moves along the second direction, each blade body in the two groups of blades can shape the radiation beam emitted by the radiation source, so that the beam-shaped radiation beam is irradiated only on the patient's tumor as much as possible. When the blade body in a group of blades needs to move along the second direction, and the horizontal distance between the target blade body in a group of blades and the central axis of the radiation beam is less than or equal to the upper limit value of the preset range, the first driving structure in the tungsten gate assembly also drives the blocking body corresponding to the blade body to move along the moving direction of the blade body, and then the blocking body can block the rays emitted by the radiation source toward the tail of the blade body. That is, the blocking body can prevent the undesirable phenomenon of ray leakage from the tail of the blade body when the corresponding blade body moves to form a field of different shapes, effectively improving the safety of the treatment head.

[0074] The embodiment of the present application also provides a method for controlling a treatment head. The treatment head mentioned in the method for controlling a treatment head may be any of the treatment heads given above. The method for controlling a treatment head may include:

[0075] When a target blade in one of the two groups of blades moves in the second reverse direction and the horizontal distance between the target blade body and the central axis of the radiation beam is less than or equal to the upper limit value of the preset range, the corresponding blocking body is driven by the first driving structure in the tungsten gate assembly to move along the moving direction of the target blade to block part of the rays in the radiation beam emitted by the radiation source.

[0076] In summary, the embodiment of the present application provides a control method for a treatment head. When the treatment head of the present application is used to treat a tumor, the blade bodies of the two groups of blades in the multi-leaf collimator need to move along the second direction. After each blade body moves along the second direction, each blade body in the two groups of blades can shape the radiation beam emitted by the radiation source, so that the beam-shaped radiation beam is irradiated only on the patient's tumor as much as possible. When the blade body in a group of blades needs to move along the second direction, and the horizontal distance between the target blade body in a group of blades and the central axis of the radiation beam is less than or equal to the upper limit value of the preset range, the first driving structure in the tungsten gate assembly also drives the blocking body corresponding to the blade body to move along the moving direction of the blade body, and then the blocking body can block the rays emitted by the radiation source toward the tail of the blade body. That is, the blocking body can prevent the undesirable phenomenon of ray leakage from the tail of the blade body when the corresponding blade body moves to form a field of different shapes, effectively improving the safety of the treatment head.

[0077] The present application embodiment provides another method for controlling a treatment head. The method for controlling a treatment head may include the following steps:

[0078] Step S1: After a target blade body in a group of blades moves along a second direction, detecting whether a horizontal distance between the target blade body and a central axis of a radiation beam emitted by a radiation source is within a preset range.

[0079] In the embodiment of the present application, the treatment head can control each leaf body to move along the second direction through the multi-leaf collimator. After each leaf body moves along the second direction, the treatment head can determine the target leaf body in each group of leaves according to the distance moved by each leaf body along the second direction, and detect whether the horizontal distance between the target leaf body and the central axis of the radiation beam emitted by the radiation source is within a preset range.

[0080] For example, when the treatment head detects that the horizontal distance between the target blade body and the central axis of the radiation beam emitted by the radiation source is within a preset range, step S2 is executed; when the treatment head detects that the horizontal distance between the target blade body and the central axis of the radiation beam emitted by the radiation source is not within the preset range, that is, when the treatment head detects that the horizontal distance between the target blade body and the central axis of the radiation beam emitted by the radiation source is outside the preset range, step S3 is executed.

[0081] Step S2: when it is detected that the horizontal distance between the target blade body in a group of blades and the central axis of the radiation beam emitted by the radiation source is within a preset range, the corresponding blocking body is driven by the first driving structure in the tungsten gate assembly to move along the moving direction of the target blade body, and part of the blocking body is located inside the radiation beam and part is located outside the radiation beam.

[0082] In an embodiment of the present application, when the treatment head detects that the horizontal distance between a target blade body in a group of blades and the central axis of a radiation beam emitted by a radiation source is within a preset range, the treatment head drives the corresponding blocking body to move along the moving direction of the target blade body through the first driving structure in the tungsten gate assembly, and part of the moving blocking body is located within the radiation beam and part is located outside the radiation beam.

[0083] Step S3: When it is detected that the horizontal distance between the target blade body in a group of blades and the central axis of the radiation beam emitted by the radiation source is outside the preset range, detect whether the horizontal distance between the target blade body and the central axis of the radiation beam emitted by the radiation source is greater than the upper limit value of the preset range.

[0084] In an embodiment of the present application, when the treatment head detects that the horizontal distance between the target blade body in a group of blades and the central axis of the radiation beam emitted by the radiation source is outside a preset range, the treatment head can detect whether the horizontal distance between the target blade body and the central axis of the radiation beam emitted by the radiation source is greater than the upper limit value of the preset range.

[0085] For example, when the treatment head detects that the horizontal distance between the target blade body and the central axis of the radiation beam emitted by the radiation source is greater than the upper limit value of the preset range, step S4 is executed; when the treatment head detects that the horizontal distance between the target blade body and the central axis of the radiation beam emitted by the radiation source is not greater than the upper limit value of the preset range, that is, when the treatment head detects that the horizontal distance between the target blade body and the central axis of the radiation beam emitted by the radiation source is less than the lower limit value of the preset range, step S5 is executed.

[0086] Step S4: when the horizontal distance between the target blade body and the central axis of the radiation beam emitted by the radiation source is greater than the upper limit of the preset range, the corresponding blocking body is driven to move outside the radiation beam by the first driving structure in the tungsten door assembly.

[0087] In an embodiment of the present application, when the treatment head detects that the horizontal distance between the target blade body in a group of blades and the central axis of the radiation beam emitted by the radiation source is greater than the upper limit value of a preset range, the treatment head drives the corresponding blocking body to move outside the radiation beam through the first driving structure in the tungsten gate assembly.

[0088] Step S5: When the horizontal distance between the target blade body and the central axis of the radiation beam emitted by the radiation source is less than the lower limit of the preset range, the corresponding blocking body is driven by the first driving structure in the tungsten gate assembly to move into the radiation beam, and at least part of the edge rays in the radiation beam can be blocked by the blocking body.

[0089] In an embodiment of the present application, when the treatment head detects that the horizontal distance between the target blade body in a group of blades and the central axis of the radiation beam emitted by the radiation source is less than the lower limit of a preset range, the treatment head drives the corresponding blocking body to move into the radiation beam through the first driving structure in the tungsten gate assembly, and at least part of the edge rays in the radiation beam can be blocked by the blocking body.

[0090] In summary, the embodiment of the present application provides a control method for a treatment head. When the treatment head of the present application is used to treat a tumor, the blade bodies of the two groups of blades in the multi-leaf collimator need to move along the second direction. After each blade body moves along the second direction, each blade body in the two groups of blades can shape the radiation beam emitted by the radiation source, so that the beam-shaped radiation beam is irradiated only on the patient's tumor as much as possible. When the blade body in a group of blades needs to move along the second direction, and the horizontal distance between the target blade body in a group of blades and the central axis of the radiation beam is less than or equal to the upper limit value of the preset range, the first driving structure in the tungsten gate assembly also drives the blocking body corresponding to the blade body to move along the moving direction of the blade body, and then the blocking body can block the rays emitted by the radiation source toward the tail of the blade body. That is, the blocking body can prevent the undesirable phenomenon of ray leakage from the tail of the blade body when the corresponding blade body moves to form a field of different shapes, effectively improving the safety of the treatment head.

[0091] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the principle of the control method of the treatment head described above can refer to the corresponding part in the embodiment of the structure of the treatment head described above, and will not be repeated here.

[0092] In the present application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. The term "plurality" refers to two or more than two, unless otherwise clearly defined.

[0093] The above description is only an optional embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A treatment head, characterized in that: include: a radioactive source for emitting a radiation beam; The tungsten door assembly comprises: two blocking bodies arranged opposite to each other, and a first driving structure respectively connected to the two blocking bodies; A multi-leaf collimator located on the side of the tungsten gate assembly away from the radiation source, the multi-leaf collimator comprising: a box body, and two sets of leaves arranged opposite to each other in the box body, each set of leaves comprising: a plurality of leaf bodies stacked and arranged along a first direction, each of the leaf bodies being capable of moving along a second direction perpendicular to the first direction; Wherein, the two blocking bodies correspond to the two groups of blades one by one, and the arrangement direction of the two blocking bodies is the same as the arrangement direction of the two groups of blades; The first driving structure is configured as follows: when the horizontal distance between a target blade body in a group of blades and the central axis of the radiation beam is within a preset range, the corresponding blocking body is driven to move along the moving direction of the target blade body so that part of the blocking body is located within the radiation beam and part of it is located outside the radiation beam, thereby blocking part of the rays in the radiation beam, and the emission direction of the rays in the radiation beam blocked by the blocking body is toward the tail of the blade body. The target blade body is the blade body in the group of blades with the smallest horizontal distance from the central axis of the radiation beam, and the horizontal distance is the minimum distance between the head of the target blade body and the central axis of the radiation beam in the second direction. The tail of the blade body is the end portion of the blade body connected to the driving structure.

2. The treatment head according to claim 1, characterized in that: The first driving structure is further configured as: When the horizontal distance between the target blade body and the central axis of the radiation beam is less than the lower limit of the preset range, and the corresponding blocking body is located outside the radiation beam, the corresponding blocking body is driven to move into the radiation beam, and at least part of the edge rays in the radiation beam can be blocked by the blocking body.

3. The treatment head according to claim 2, characterized in that: The distance that the blocking body moves along the moving direction of the target blade body is positively correlated with the distance that the target blade body moves.

4. The treatment head according to claim 1, characterized in that: The first driving structure is further configured to drive the corresponding blocking body to move outside the radiation beam when the horizontal distance between the target blade body and the central axis of the radiation beam is greater than an upper limit value of the preset range.

5. The treatment head according to claim 1, characterized in that: The first driving structure comprises a double-layer driving structure arranged opposite to each other, and the double-layer driving structure arranged opposite to each other drives the two blocking bodies respectively.

6. The treatment head according to claim 5, characterized in that: Each layer of the driving structure includes: a driving mechanism and a driving motor, the driving mechanism is connected to the blocking body and the driving motor, and the driving motor is configured to: drive the blocking body to move along the moving direction of the target blade body through the driving mechanism.

7. The treatment head according to claim 1, characterized in that: Each group of blades further includes a second driving structure connected to the plurality of blade bodies in a one-to-one correspondence, and each of the second driving structures is configured to drive the corresponding blade body to move along the second direction.

8. The treatment head according to claim 1, characterized in that: The treatment head further comprises: an aperture located between the tungsten gate assembly and the multi-leaf collimator, the aperture comprising: two aperture bodies arranged opposite to each other, the arrangement direction of the two aperture bodies being perpendicular to the arrangement direction of the two blocking bodies.

9. The treatment head according to claim 1, characterized in that: The treatment head further comprises: a mounting seat, wherein a side surface of the mounting seat has a mounting opening; The tungsten door assembly further includes: a base, the two blocking bodies and the first driving structure are both mounted on the base, and the base is detachably connected to the mounting seat through the mounting opening.

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