Tungsten door, collimator assembly, radiotherapy equipment and radiotherapy system

Abstract

The utility model provides a tungsten door, a collimator assembly, radiotherapy equipment and a radiotherapy system, and relates to the technical field of radiotherapy, the tungsten door comprises a first tungsten block and a second tungsten block which are oppositely arranged, a plurality of first grooves with different sizes are formed in the first tungsten block, and a plurality of second grooves with different sizes are formed in the second tungsten block; through relative movement of the first tungsten block and the second tungsten block, the first groove and the second groove are oppositely spliced to form at least one collimation hole, so that a ray beam of radiotherapy equipment passes through the collimation hole. The tungsten door is used in cooperation with the multi-leaf collimator, and stereotactic radiotherapy and conformal intensity modulated radiotherapy of the accelerator are achieved. During conformal intensity-modulated radiation therapy, the tungsten gate deviates from the conformal area, and the multi-leaf collimator forms the conformal area to allow a ray beam to pass through. During stereotactic radiotherapy, the collimation holes are located in the conformal areas, ray beams sequentially penetrate through the conformal areas and the collimation holes, different collimation holes are spliced to correspond to the conformal areas, and stereotactic radiotherapy of different radiation fields is achieved.

Description

Technical Field

[0001] This application relates to the field of radiotherapy technology, and particularly to a tungsten gate, a collimator assembly, a radiotherapy device, and a radiotherapy system. Background Art

[0002] Currently, gamma knives and medical linear accelerators are two effective means for treating tumors. Gamma knives use a natural radiation source Co-60 and, through stereotactic radiotherapy, form a focused beam using a focused treatment head to treat lesions, with high treatment accuracy and being particularly suitable for treating intracranial lesions. With the boost of multi-leaf collimator technology, medical linear accelerators use a conformal treatment head to carry out conformal intensity-modulated radiotherapy, significantly improving treatment efficiency and accuracy, and are the mainstream method for treating large-area lesions in the body.

[0003] In related technologies, a focused treatment head and a conformal treatment head are integrated to form a new treatment system. However, the integrated system is large in volume and weight, increasing the complexity and maintenance difficulty of the system. At the same time, during the operation of the accelerator, the failure rate is high, and it needs to be frequently maintained to ensure the stable operation of the system, bringing huge costs to later maintenance. Especially after the source is installed in the focusing head, it is necessary to maintain the multi-leaf collimator of the accelerator inside the device, further increasing the difficulty of maintenance work. Summary of the Utility Model

[0004] An object of an embodiment of this application is to provide a tungsten gate, a collimator assembly, a radiotherapy device, and a radiotherapy system. The radiotherapy system can simultaneously achieve stereotactic radiotherapy and conformal intensity-modulated radiotherapy of the accelerator through the collimator assembly.

[0005] On one hand, an embodiment of this application provides a tungsten gate applied to a radiotherapy device, including a first tungsten block and a second tungsten block arranged oppositely. A plurality of first grooves with different sizes are formed on the first tungsten block, and a plurality of second grooves with different sizes are formed on the second tungsten block. Through the relative movement of the first tungsten block and the second tungsten block, at least one collimation hole is formed after the first grooves and the second grooves are spliced relatively, for the ray beam of the radiotherapy device to pass through the collimation hole.

[0006] Optionally, in a state where one collimation hole is formed after the first tungsten block and the second tungsten block are spliced relatively, the other first grooves and second grooves are arranged staggeredly at the splicing position of the first tungsten block and the second tungsten block.

[0007] Optionally, the first grooves and the second grooves used for splicing to form the collimation hole have different sizes.

[0008] Optionally, the splicing positions of the first tungsten block and the second tungsten block are respectively stepped structures that can be fitted.

[0009] On the other hand, an embodiment of the present application provides a collimator assembly, including: a multi-leaf collimator, a first driver, a second driver, and the above-mentioned tungsten gate. The first driver can be used to drive the multi-leaf collimator to move to form a conformal region, and the second driver can be used to drive the tungsten gate to move to form the collimation hole;

[0010] When the tungsten gate forms a collimation hole, the multi-leaf collimator forms a conformal region, and when the collimation hole is located within the conformal region, the radiation beam sequentially passes through the conformal region and the collimation hole;

[0011] Or, when the tungsten gate deviates from the conformal region, the multi-leaf collimator forms a conformal region, and the radiation beam passes through the conformal region.

[0012] Optionally, when the collimation hole is located within the conformal region, the blades of the multi-leaf collimator are further used to shield the leakage of the first groove and the second groove.

[0013] Optionally, the moving direction of the first tungsten block and the second tungsten block is the same as the moving direction of the multi-leaf collimator, or an included angle is formed between the moving direction of the first tungsten block and the second tungsten block and the moving direction of the blades of the multi-leaf collimator.

[0014] An embodiment of the present application further provides a radiotherapy device, including a gantry and a treatment head arranged on the gantry;

[0015] The treatment head is arranged on the gantry and rotates in a first plane driven by the gantry; the treatment head includes a radiation source and the above-mentioned collimator assembly, and the collimator assembly is arranged on the path of the radiation beam emitted by the radiation source.

[0016] An embodiment of the present application further provides a radiotherapy system, including an imaging device and the above-mentioned radiotherapy device;

[0017] The radiotherapy device is used to emit the radiation beam to a target area, and the imaging device is used to image the target area of a target object;

[0018] Wherein, the imaging device coincides with the isocenter of the radiotherapy device.

[0019] Optionally, the imaging device includes at least a pair of oppositely arranged imaging sources and imaging detectors.

[0020] The tungsten gate, collimator assembly, radiotherapy device, and radiotherapy system provided by the embodiments of the present application. On the first tungsten block of the tungsten gate, a plurality of first grooves with different sizes are formed. On the second tungsten block, a plurality of second grooves with different sizes are formed. After the first tungsten block and the second tungsten block are butted, through the relative movement of the two, the first grooves and the second grooves can be relatively spliced on the tungsten gate to form at least one collimation hole, and the collimation hole can be used to allow the ray beam to pass through and focus on the target area. The tungsten gate of the present application is used in cooperation with a multi-leaf collimator, and can simultaneously realize stereotactic radiotherapy and intensity-modulated conformal radiotherapy of an accelerator. When intensity-modulated conformal radiotherapy is required, the tungsten gate deviates from the conformal area, and the multi-leaf collimator forms the conformal area, and the ray beam passes through the conformal area. When stereotactic radiotherapy is required, the collimation hole is located within the conformal area, and the ray beam passes through the conformal area and the collimation hole in sequence. By splicing different collimation holes corresponding to the conformal area, stereotactic radiotherapy with different-sized radiation fields can be realized. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the embodiments of the present application will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0022] Figure 1 is one of the schematic structural diagrams of the tungsten gate provided by this embodiment;

[0023] Figure 2 is the second schematic structural diagram of the tungsten gate provided by this embodiment;

[0024] Figure 3 is the third schematic structural diagram of the tungsten gate provided by this embodiment;

[0025] Figure 4 is the fourth schematic structural diagram of the tungsten gate provided by this embodiment;

[0026] Figure 5 is the fifth schematic structural diagram of the tungsten gate provided by this embodiment;

[0027] Figure 6 is the schematic structural diagram of the cooperation between the tungsten gate and the multi-leaf collimator provided by this embodiment;

[0028] Figure 7 is the schematic structural diagram of the radiotherapy device provided by this embodiment;

[0029] Figure 8 is the first schematic structural diagram of the radiotherapy system provided by this embodiment;

[0030] Figure 9It is the second schematic structural diagram of the radiotherapy system provided by this embodiment;

[0031] Figure 10 It is the third schematic structural diagram of the radiotherapy system provided by this embodiment. Specific implementation manners

[0032] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application.

[0033] In the description of the present application, it should be noted that the orientation or positional relationship indicated by terms such as "inside", "outside", etc. is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this application is usually placed during use. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application. In addition, terms such as "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0034] It should also be noted that unless otherwise clearly specified and limited, the terms "set", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0035] When using a radiation source to emit a radioactive radiation beam to treat a lesion, it is desired that the radiation beam can be accurately focused on the lesion; at the same time, the part of the radiation beam outside the lesion should be as completely shielded as possible to avoid damaging the non-lesion part of the patient. However, the current technology has deficiencies in both aspects, which has a certain impact on the treatment.

[0036] Based on this, an embodiment of the present application provides a tungsten gate, which is applied to a radiotherapy device and includes: a first tungsten block and a second tungsten block arranged oppositely. A plurality of first grooves with different sizes are formed on the first tungsten block, and a plurality of second grooves with different sizes are formed on the second tungsten block. By the relative movement of the first tungsten block and the second tungsten block, at least one collimation hole is formed after the first groove and the second groove are relatively spliced, for the radiation beam of the radiotherapy device to pass through the collimation hole.

[0037] The first tungsten block and the second tungsten block are relatively spliced, and a plurality of first grooves and a plurality of second grooves are respectively formed on their respective splicing surfaces. When the first groove and the second groove are aligned, at least one collimation hole can be formed, and this collimation hole is used for the radiation beam to pass through, collimating and focusing the radiation beam.

[0038] In addition, there may be one collimation hole formed, allowing the applicable radiation beam to pass through the corresponding collimation hole.

[0039] There may also be multiple collimation holes. When the first tungsten block and the second tungsten block are aligned, multiple collimation holes are formed. Since the sizes of the multiple first grooves are different and the sizes of the multiple second grooves are also different, after different first grooves and different second grooves are aligned and matched, the sizes of the multiple formed collimation holes are also different. Different collimation holes can be applicable to lesions of different sizes. In this way, using the same tungsten gate can meet different treatment requirements, improving the flexibility of treatment and reducing the treatment cost.

[0040] The collimation holes formed by the first tungsten block and the second tungsten block can be formed by splicing first grooves and second grooves of the same size, or by splicing first grooves and second grooves of different sizes to form different collimation holes respectively.

[0041] When the first groove and the second groove forming the collimation hole are aligned, the radiation beam passes through the collimation hole to irradiate the lesion for treatment. While other first grooves and second grooves are misaligned and no collimation hole is formed. At this time, due to the misaligned setting of the other first grooves and second grooves that do not form the collimation hole, they can shield the radiation beam outside the lesion area to reduce the leakage of the radiation beam and avoid damage to the area without lesions.

[0042] The tungsten gate of the present application is used in cooperation with the multi-leaf collimator. The tungsten gate moves so that the first tungsten block and the second tungsten block are spliced to form a collimation hole for the radiation beam to pass through. The movement of the leaves of the multi-leaf collimator can also form a conformal area for the radiation beam to pass through. When the radiation beam only passes through the conformal area, a conformal radiation field can be formed at the lesion area to be consistent with the shape of the lesion area, enabling conformal intensity-modulated radiotherapy for large-area lesions. When the collimation hole and the conformal area are arranged on the outgoing path of the radiation beam, the radiation beam passing through the collimation hole and the conformal area can form a focused radiation field in the target area for accurately focusing on the lesion area, for small-field lesion or local dose enhancement treatment of the lesion, or stereotactic radiotherapy. At this time, the misaligned first grooves and second grooves on the tungsten gate can shield the radiation beam outside the lesion area and reduce the leakage of the radiation beam.

[0043] Therefore, for the tungsten gate provided by the embodiments of the present application, a plurality of first grooves with different sizes are formed on the first tungsten block, and a plurality of second grooves with different sizes are formed on the second tungsten block. After the first tungsten block and the second tungsten block are butted, by the relative movement of the two, the first grooves and the second grooves can be relatively spliced to form at least one collimation hole, and the collimation hole can be used to allow the beam of the radiotherapy device to pass through and focus on the target area. The tungsten gate of the present application is used in cooperation with a multi-leaf collimator, and conformal intensity-modulated radiotherapy or stereotactic radiotherapy can be performed. When conformal intensity-modulated radiotherapy is required, the tungsten gate is opened, the multi-leaf collimator blades move conformally, the tungsten gate deviates from the conformal area, and the beam passes through the conformal area. When stereotactic radiotherapy is required, the blades are opened, the tungsten gate moves to the field position, the collimation hole is located within the conformal area, and the beam passes through the conformal area and the collimation hole in sequence. By splicing different collimation holes corresponding to the fields, stereotactic radiotherapy with a small field is achieved.

[0044] As mentioned above, in the state where a collimation hole is formed after the first tungsten block and the second tungsten block are relatively spliced, the other first grooves and second grooves are arranged in a staggered manner at the splicing position of the first tungsten block and the second tungsten block. When arranged in a staggered manner, part of the beam can be blocked, reducing the leakage of the beam.

[0045] Taking Figure 1 、 Figure 2 、 Figure 3 as an example, five first grooves with different sizes, namely first groove 3a1, first groove 3b1, first groove 3c1, first groove 3d1, and first groove 3e1, are respectively formed on the first tungsten block 30A, and five second grooves with different sizes, namely second groove 3a2, second groove 3b2, second groove 3c2, second groove 3d2, and second groove 3e2, are correspondingly formed on the second tungsten block 30B; among them, when the first groove 3e1 and the second groove 3e2 are aligned, a collimation hole 3e can be formed, as shown in Figure 1 . When the other corresponding first grooves and second grooves are aligned, collimation holes of other sizes are formed. For example, when the first groove 3a1 and the second groove 3a2 are spliced, a collimation hole 3a can be formed; when the first groove 3b1 and the second groove 3b2 are spliced, a collimation hole 3b can be formed; when the first groove 3c1 and the second groove 3c2 are spliced, a collimation hole 3c can be formed; when the first groove 3d1 and the second groove 3d2 are spliced, a collimation hole 3d can be formed.

[0046] By moving the first tungsten block 30A and the second tungsten block 30B, the first grooves and the second grooves can respectively form the above five collimation holes 3a, 3b, 3c, 3d, and 3e with different sizes. Taking Figure 1 as an example, when the collimation hole 3e is formed, the other first grooves and second grooves are staggered; at this time, only one collimation hole 3e is formed, allowing the beam to pass through; the other staggered first grooves and second grooves play a role in blocking the beam.

[0047] In another embodiment for reducing leakage, the first tungsten block and the second tungsten block are respectively provided with a stepped structure that can be fitted at the splicing position to block the radiation beam.

[0048] For example, as Figure 4 shown, the first tungsten block 30A and the second tungsten block 30B respectively form a first stepped platform 30A0 and a second stepped platform 30B0. When the first tungsten block 30A and the second tungsten block 30B are spliced relatively, the tabletop 30A1 of the first stepped platform 30A0 and the tabletop 30B1 of the second stepped platform 30B0 are arranged oppositely, and the misaligned first groove is blocked by the second stepped platform 30B0, and the second groove is blocked by the first stepped platform 30A0.

[0049] In this way, the radiation beam passing through the groove is blocked by the stepped platform of the other party, and the purpose of reducing leakage can also be achieved. For example, Figure 5 .

[0050] By the blocking of the above-mentioned blades and the mutual fitting of the stepped structures to achieve blocking, leakage can be reduced; the above two leakage prevention settings can be selected alternatively, or both can be selected at the same time, enhancing the diversity and flexibility of the leakage prevention methods.

[0051] In summary, the tungsten gate provided by the embodiment of the present application can form a collimation hole for controlling collimation by splicing the first groove of the first tungsten block and the second groove of the second tungsten block for stereotactic radiotherapy; at the same time, the leakage is prevented by the misaligned setting of the first groove and the second groove or the stepped structure fitted at the docking position of the first tungsten block and the second tungsten block.

[0052] On this basis, the embodiment of the present application also discloses a collimator assembly, including a multi-leaf collimator, a first driver, a second driver, and a tungsten gate as described in any one of the above. The first driver can be used to drive the movement of the blades of the multi-leaf collimator to form a conformal area through which the radiation beam can pass, and the second driver can be used to drive the movement of the tungsten gate. By the relative movement of the first tungsten block and the second tungsten block, a collimation hole through which the radiation beam can pass is formed.

[0053] The tungsten gate forms a collimation hole, the multi-leaf collimator forms a conformal area, and the collimation hole is located within the conformal area. The radiation beam passes through the conformal area and the collimation hole in sequence.

[0054] The order of the tungsten gate and the multi-leaf collimator along the radiation beam exit direction is not limited. It can be that the radiation beam first passes through the collimation hole formed by the tungsten gate and then through the conformal area formed by the multi-leaf collimator; it can also be that the radiation beam first passes through the conformal area formed by the multi-leaf collimator and then through the collimation hole formed by the tungsten gate.

[0055] When the collimation hole is located within the conformal area, the radiation beam passes through the conformal area and the collimation hole to form a focused radiation field in the target area.

[0056] Alternatively, when the tungsten gate deviates from the conformal region, the multi-leaf collimator forms a conformal region, and the radiation beam passes through the conformal region to form a conformal radiation field in the target area.

[0057] On the other hand, when the collimation hole is located within the conformal region, the blades of the multi-leaf collimator are also used to shield the leakage radiation from the first groove and the second groove.

[0058] Specifically, the misaligned first groove and second groove are blocked by the blades of the multi-leaf collimator located on one side of the tungsten gate, so that the radiation beam is shielded by the blades after passing through the first groove and the second groove. For example, the multi-leaf collimator is located on one side of the tungsten gate along the through direction of the collimation hole, which can be on the upper side of the tungsten gate or on the lower side of the tungsten gate.

[0059] The multi-leaf collimator (Multi Leaf Collimator, MLC) is used in a radiotherapy system and includes at least one layer of blade assemblies. As Figure 6 shown, taking the multi-leaf collimator 40 including one layer of blade assemblies as an example, the multi-leaf collimator includes two opposite blade groups 40a and 40b. Each blade group includes a plurality of blades, and each blade can move independently. Thus, the blades can conform to form a conformal region through which the radiation beam can pass, so that the radiation beam fits the shape of the target area to protect normal tissues. The blades of the two blade groups 40a and 40b cannot approach each other sufficiently, and there is usually a certain degree of leakage through the gaps between adjacent blades.

[0060] The tungsten gate 30 can move to cooperate with the blades to conform, and thus limit the inter-blade leakage between the tips of the opposite blades and between adjacent blades. On the other hand, the misaligned first groove and second groove on the tungsten gate 30 can also be blocked by the blades to reduce the leakage of the radiation beam. In this way, when the tungsten gate 30 and the multi-leaf collimator 40 are used in combination, they can shield each other's leakage areas, improving the anti-leakage effect.

[0061] Figure 6 In, the first tungsten block 30A and the second tungsten block 30B are far from each other and do not form a collimation hole by splicing. At this time, the radiation beam only passes through the conformal region 41 formed by the multi-leaf collimator 40 to form a conformal radiation field at the lesion. When the first tungsten block and the second tungsten block approach each other and form a collimation hole by splicing, the radiation beam passes through the collimation hole and the conformal region, and an aggregated radiation field can be formed at the lesion.

[0062] When the tungsten gate 30 deviates from the conformal region 41, refer to Figure 6 , the first tungsten block 30A and the second tungsten block 30B are far from each other. At this time, the radiation beam only passes through the conformal region 41 formed by the multi-leaf collimator 40 to form a conformal radiation field at the lesion.

[0063] Exemplarily, when the collimation hole is located within the conformal region and is used for the radiation beam to pass through the collimation hole and the conformal region, the leaves of the multi-leaf collimator are also used to shield the leakage radiation of the first groove and the second groove.

[0064] When the first groove and the second groove are misaligned, the radiation beam passing through the misaligned first groove and second groove can be blocked by the leaves, achieving leakage prevention.

[0065] Exemplarily, the moving directions of the first tungsten block and the second tungsten block are the same as the moving direction of the multi-leaf collimator, or an included angle is formed between the moving directions of the first tungsten block and the second tungsten block and the moving direction of the leaves of the multi-leaf collimator. The tungsten gate and the multi-leaf collimator move in the same direction or at an included angle to meet different treatment requirements.

[0066] Refer to Figure 8 、 Figure 9 Furthermore, the present application also provides a radiotherapy device, including a gantry 200 and a treatment head 100 disposed on the gantry 200; the treatment head 100 is disposed on the gantry 200 and rotates around the isocenter o of the radiotherapy device in a first plane S under the drive of the gantry 200; by the rotation of the gantry 200 and the treatment head 100, the radiation beam is emitted from different angles to achieve coplanar and non-coplanar irradiation, enabling the patient to obtain a better treatment effect.

[0067] Exemplarily, the gantry 200 includes a fixed gantry and a rotating gantry. The treatment head 100 is located on the rotating gantry, and the rotating gantry can rotate relative to the fixed gantry around the isocenter o of the radiotherapy device. For details, refer to the prior art and will not be elaborated here.

[0068] Please refer to Figure 10 Moreover, the radiotherapy device provided in an embodiment of the present application further includes a treatment couch 300. The treatment couch 300 is used to carry the patient, and the treatment couch 300 can move along the isocenter line L direction of the radiotherapy device, thereby adjusting the position of the treatment couch 300 relative to the treatment head so that the treatment area of the patient coincides with the path of the radiation beam emitted by the treatment head 10.

[0069] Exemplarily, as Figure 7 shown, the treatment head 100 includes a radiation source 10 and the above-mentioned collimator assembly, and the collimator assembly is disposed on the path of the radiation beam emitted by the radiation source 10.

[0070] Generally, the radiation emitted by the radiation source 10 needs to be collimated by the primary collimator 20 and then focused on the target area through the collimator assembly.

[0071] When the radiation beam passes through the collimator assembly, it finally hits the patient through the tungsten gate 30 and the multi-leaf collimator 40. The multi-leaf collimator 40 and the tungsten gate 30 cooperate to allow the transmission of a radiation beam with a desired cross-section. For example, the radiation beam forms a conformal radiation field in the target area through the multi-leaf collimator 40 for conformal intensity-modulated radiotherapy; the radiation beam forms a focused radiation field in the target area through the conformal area and the collimation hole for local dose enhancement therapy or stereotactic radiotherapy; and through the cooperation of the multi-leaf collimator 40 and the tungsten gate 30, as complete a shielding as possible of the rest of the beam field (i.e., the maximum range of the beam) can also be provided to reduce leakage. The leakage can be achieved by the blades blocking through the misaligned first and second grooves on the first and second tungsten blocks, or by the engageable stepped structure formed at the joint of the first and second tungsten blocks.

[0072] On the other hand, an embodiment of the present application also provides a radiotherapy system, including an imaging device and the above radiotherapy device;

[0073] The radiotherapy device is used to emit a radiation beam for treatment to a target area to treat the target area such as a lesion; the imaging device is used to image the target area of the target object, and the imaging setting can be used to achieve precise treatment. By collecting patient images, information such as the shape, volume, and position of the lesion is provided to accurately locate the lesion and achieve real-time monitoring of the lesion. At the same time, the imaging data during treatment is also collected to achieve the digitalization and automation of treatment.

[0074] Among them, the isocenter of the imaging device coincides with that of the radiotherapy device, and a treatment couch is provided at the isocenter so that the patient can be located at the isocenter position to ensure the treatment effect.

[0075] The imaging device of the radiotherapy system provided by an embodiment of the present application further includes an imaging source and an imaging detector, which are arranged opposite to each other within a rotating gantry.

[0076] Exemplarily, referring to Figure 9 and Figure 10 , when imaging a patient with this radiotherapy system, the patient lies on the treatment couch 300, and the treatment couch 300 is moved to position the patient between the imaging source 401 and the imaging detector 402. The imaging source 401 and the imaging detector 402 operate in a manner well-known in the prior art to collect images of the patient. When treating the patient, the treatment couch 300 is moved so that the target area determined by the collected images is within the beam output range of the treatment head 100, and the electronic portal imaging device 500 is used to receive the beam output from the treatment head 10. The electronic portal imaging device 500 is mainly used to reflect the distribution of the treatment dose so as to adjust the dose as needed and improve the treatment effect.

[0077] In Figure 9In the described embodiments, an imaging device including a pair of imaging sources and an imaging detector is taken as an example for illustration. The imaging device may also include two pairs of imaging sources and imaging detectors that are angled with each other. The imaging device may also be any one of an X-ray imaging device, a CT imaging device, an ultrasonic imaging device, a DSA imaging device, an MR imaging device, a PET imaging device, or any combination thereof. This application does not make specific limitations thereon and only takes the examples shown in the drawings as illustrations.

[0078] This collimator assembly, radiotherapy device, and radiotherapy system include the same structures and beneficial effects as the tungsten gate in the foregoing embodiments. The structures and beneficial effects of the tungsten gate have been described in detail in the foregoing embodiments and will not be elaborated herein.

[0079] The foregoing are only the embodiments of the present application and are not intended to limit the protection scope of the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A tungsten door, characterized in that: The invention is applied to radiotherapy equipment, comprising: a first tungsten block and a second tungsten block arranged opposite to each other, wherein a plurality of first grooves of different sizes are formed on the first tungsten block, and a plurality of second grooves of different sizes are formed on the second tungsten block, and the first tungsten block and the second tungsten block are relatively moved so that the first grooves and the second grooves are relatively spliced ​​to form at least one collimation hole, which is used for allowing the radiation beam of the radiotherapy equipment to pass through the collimation hole.

2. The tungsten door according to claim 1, characterized in that: When the first tungsten block and the second tungsten block are relatively spliced ​​to form the collimating hole, the other first grooves and the second grooves are staggered at the splicing position of the first tungsten block and the second tungsten block.

3. The tungsten door according to claim 2, characterized in that: The first groove and the second groove used for splicing to form the collimating hole have different sizes.

4. The tungsten door according to claim 2, characterized in that: The first tungsten block and the second tungsten block are respectively formed into a step structure that can be embedded at the joint.

5. A collimator assembly, characterized in that: The invention comprises a multi-leaf collimator, a first driver, a second driver and the tungsten gate according to any one of claims 1 to 4, wherein the first driver can be used to drive the multi-leaf collimator to move to form a conformal area, and the second driver can be used to drive the tungsten gate to move to form the collimation hole; The tungsten gate forms a collimating hole, the multi-leaf collimator forms a conformal region, and when the collimating hole is located within the conformal region, the ray beam passes through the conformal region and the collimating hole in sequence; Alternatively, when the tungsten gate deviates from the conformal region, the radiation beam passes through the conformal region.

6. The collimator assembly according to claim 5, characterized in that: The collimating hole is located in the conformal region, and the leaves of the multi-leaf collimator are also used to shield the leakage of the first groove and the second groove.

7. The collimator assembly according to claim 6, characterized in that: The movement directions of the first tungsten block and the second tungsten block are the same as the movement direction of the multi-leaf collimator, or the movement directions of the first tungsten block and the second tungsten block form an angle with the movement directions of the leaves of the multi-leaf collimator.

8. A radiotherapy device, characterized in that: It comprises a frame and a treatment head arranged on the frame; The treatment head is arranged on the frame and rotates in a first plane driven by the frame; the treatment head includes a radiation source and a collimator assembly as described in any one of claims 5 to 7, and the collimator assembly is arranged on the path of the radiation beam emitted by the radiation source.

9. A radiotherapy system, characterized in that: comprising an imaging device and a radiotherapy device as claimed in claim 8; The radiotherapy device is used to emit the radiation beam to the target area, and the imaging device is used to image the target area of ​​the target object; Wherein, the isocenter of the imaging device coincides with that of the radiotherapy device.

10. The radiation therapy system according to claim 9, characterized in that The imaging device comprises at least one pair of imaging source and imaging detector which are arranged opposite to each other.

Images