Rotating floor with transmission window
By setting a transmission window on the rotating floor, the problem of balancing X-ray transmission efficiency and mechanical load-bearing strength in proton therapy devices was solved, enabling CBCT imaging and improving target area positioning accuracy.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
- Filing Date
- 2025-07-22
- Publication Date
- 2026-07-03
AI Technical Summary
Existing rotating floors in proton therapy devices struggle to balance X-ray transmission efficiency and mechanical load-bearing strength, resulting in poor CBCT imaging performance.
A transmission window is installed on a rotating floor. Through the design of the transmission device and floor assembly, X-rays can pass through while meeting the load-bearing strength requirements, thus enabling CBCT imaging.
It enables CBCT imaging on proton therapy devices, improving target localization accuracy and achieving a balance between X-ray transmittance and mechanical load-bearing strength.
Smart Images
Figure CN224441941U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of radiotherapy technology, and more specifically to a rotating floor with a transmission window. Background Technology
[0002] Proton therapy, as the most advanced radiotherapy technology currently available, owes its core advantage to the precise targeting of tumors using the Bragg peak characteristics of proton beams. However, its therapeutic effect is highly dependent on the accuracy of patient positioning and target localization. Currently, existing proton therapy devices primarily use two-dimensional X-ray imaging systems to correct patient positioning, but this lacks three-dimensional information, affecting positioning accuracy.
[0003] In traditional photon radiotherapy, cone-beam computed tomography (CBCT) systems are already well-established, achieving three-dimensional imaging through an onboard kV-level X-ray source and a flat-panel detector. Integrating a CBCT system into a proton therapy device could potentially improve target localization accuracy. One possible approach is to place the X-ray source beneath a rotating floor, with a flat-panel detector mounted on the treatment head. The X-rays emitted from the source pass sequentially through the rotating floor and the patient before reaching the flat-panel detector, thus achieving CBCT imaging.
[0004] However, the thickness and material density of existing rotating floor panels cannot simultaneously achieve both X-ray transmission efficiency and mechanical load-bearing strength. If the floor panel is thinned to ensure transmittance, the risk of deformation of the rotating floor's load-bearing structure will increase significantly; if high-density materials are used to enhance stability, X-ray attenuation will be severe, failing to meet the dose and signal-to-noise ratio requirements for CBCT imaging. Utility Model Content
[0005] The purpose of this invention is to provide a rotating floor with a transmission window, which can meet the load-bearing strength requirements of a rotating floor and allow X-rays to pass through, thus enabling CBCT imaging on a proton therapy device.
[0006] To achieve the above objectives, this utility model provides a rotating floor with a transmission window, comprising:
[0007] The two guide support devices are arranged in a closed ring shape and are parallel to each other;
[0008] A first floor assembly is axially disposed between two guide support devices, with its two axial ends slidably connected to the two guide support devices respectively, and the first floor assembly defining an opening for the treatment head to pass through.
[0009] A second floor assembly is axially disposed between two guide support devices. Both axial ends of the second floor assembly are slidably connected to the two guide support devices, and both circumferential ends of the second floor assembly are connected to the circumferential ends of the first floor assembly to form a closed annular floor. The second floor assembly defines a window.
[0010] A transmission device is connected to the second floor assembly and covers the window, the window and the transmission device forming the transmission window.
[0011] Optionally, the first floor assembly includes multiple first floor panels connected in sequence and two first traction chains respectively disposed at both ends of the first floor panels. The two first traction chains correspond one-to-one with two guide support devices. The first traction chains extend circumferentially and are connected to the corresponding guide support devices and can move on them. The axial ends of each first floor panel are respectively connected to the two first traction chains.
[0012] Optionally, the second floor assembly includes multiple second floor panels, multiple third floor panels, two second traction chains, and two third traction chains. Each second floor panel and each third floor panel corresponds to one other. Each second floor panel and its corresponding third floor panel extend axially and are spaced apart. The gap between each second floor panel and its corresponding third floor panel forms the window.
[0013] The axial end of each second floor piece that is away from the corresponding third floor piece is taken as the first axial end of the second floor piece, and the axial end of each second floor piece that is close to the corresponding third floor piece is taken as the second axial end of the second floor piece. The axial end of each third floor piece that is away from the corresponding second floor piece is taken as the first axial end of the third floor piece, and the axial end of each third floor piece that is close to the corresponding second floor piece is taken as the second axial end of the third floor piece.
[0014] Two second traction chains and two third traction chains extend circumferentially. The two second traction chains correspond one-to-one with the two guide support devices and one-to-one with the two first traction chains. The second traction chains are connected to the corresponding guide support devices and can move on them. The circumferential ends of the second traction chains are respectively connected to the circumferential ends of the corresponding first traction chains to form a closed loop traction chain. The first axial end of each second floor is connected to one of the second traction chains, and the first axial end of each third floor is connected to the other second traction chain. The second axial end of each second floor is connected to one of the third traction chains, and the second axial end of each third floor is connected to the other third traction chain. The circumferential ends of the two third traction chains are connected to the first floor of the first floor assembly adjacent to the second floor assembly.
[0015] Optionally, any two adjacent floorboards are connected by a connector, the connector being rotatable relative to the floorboards and covering the gap between the floorboards; wherein the floorboards include a first floorboard, a second floorboard, and a third floorboard.
[0016] Optionally, the transmission device includes multiple transmission plates, each transmission plate corresponding to a second floor and a third floor. Each transmission plate extends axially, and both ends of each transmission plate are connected to the second axial ends of the corresponding second floor and the second axial ends of the corresponding third floor, respectively, to cover the gap between the second floor and the third floor. The transmission plates are arranged sequentially in the circumferential direction to cover the window.
[0017] Optionally, there is a gap between any two adjacent transmission plates, and there is a gap between the transmission plate adjacent to the first floor and the first floor; a shielding member is provided on the first floor adjacent to the transmission plate to shield the gap between the transmission plate and the first floor.
[0018] Optionally, the two adjacent ends of any two adjacent transmission plates are formed as inclined surfaces, and the two inclined surfaces are arranged opposite to each other so that the two adjacent ends are misaligned.
[0019] Optionally, a fixing component is provided on the second axial end of the second floor and the second axial end of the third floor, the fixing component being used to detachably connect the axial end of the transmission plate to the second floor or the third floor.
[0020] Optionally, the fixing assembly includes a support frame, a base, and a fixing clip. The support frame is fixed to the bottom of the second floor or the third floor, the base is fixed to the support frame, and the axial end of the transmission plate is detachably mounted on the base via the fixing clip.
[0021] Optionally, the support frame is provided with a fixed shaft, and the base is sleeved on the fixed shaft; the fixed shaft is provided with an elastic element, which is compressed between the base and the support frame, so that the base performs elastic movement on the fixed shaft in response to the extrusion force on the transmission plate. Attached Figure Description
[0022] Figure 1 This is a schematic diagram of the structure of a rotating floor with a transmission window according to an embodiment of the present invention;
[0023] Figure 2 for Figure 1 Enlarged view of Part I;
[0024] Figure 3 for Figure 1 A schematic diagram of the structure after the transmission device is removed from Part I;
[0025] Figure 4 for Figure 1 A schematic diagram of the bottom of section I;
[0026] Figure 5 This is a schematic diagram showing the connection relationship between the second floor, the third floor, and the transmission plate of a rotating floor with a transmission window according to an embodiment of the present invention.
[0027] Figure 6 This is a schematic diagram of the bottom structure of the fixing component according to an embodiment of the present utility model;
[0028] Figure 7 This is a schematic diagram of the proton therapy device of the integrated CBCT system implemented according to the present invention. Detailed Implementation
[0029] The preferred embodiments of this utility model are given below with reference to the accompanying drawings and described in detail.
[0030] The proton therapy device includes a rotating gantry, a rotating floor, and a treatment head. The treatment head is mounted on the rotating gantry and is driven to rotate 180 or 360 degrees by the gantry. The treatment head is connected to the rotating floor and rotates with the rotating floor. The structure of existing rotating floors can be found in patent application CN114042261A, and will not be described in detail here. According to the disclosure of patent application CN114042261A, its rotating floor does not have a transmission window, therefore it cannot allow X-rays to pass through (or the transmission efficiency is poor), thus making CBCT imaging impossible.
[0031] Based on this, this invention improves upon existing technology by incorporating a transmission window into the rotating floor, making CBCT imaging possible on the proton therapy device. For example... Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, this embodiment of the present invention provides a rotating floor with a transmission window, including two guide support devices 100, a first floor assembly 200, and a second floor assembly 300. The two guide support devices 100 are in a closed ring shape and are arranged parallel to each other. The first floor assembly 200 and the second floor assembly 300 are arc-shaped. The first floor assembly 200 is arranged axially (i.e., perpendicular to the plane where the guide support devices 100 are located) between the two guide support devices 100. The two ends of the first floor assembly 200 are slidably connected to the two guide support devices 100 respectively. The first floor assembly 200 defines an opening. The treatment head passes through the opening and is connected to the first floor assembly 200; the second floor assembly 300 is axially disposed between the two guide support devices 2, and the two axial ends of the second floor assembly 300 are slidably connected to the two guide support devices 100 respectively, and the two circumferential ends of the second floor assembly 300 are connected to the two circumferential ends of the first floor assembly 200 respectively, so as to form a closed annular floor structure; the second floor assembly 300 defines a window 310, the transmission device 400 is connected to the second floor assembly 300 and covers the window 310, and the window 310 and the transmission device 400 form a transmission window for X-rays to pass through.
[0032] The first floor assembly 200 may include multiple first floor panels 210 connected in sequence and two first traction chains respectively disposed at both axial ends of the first floor panels 210. Each first traction chain corresponds to one of the two guide support devices 100. The first traction chains extend circumferentially and are connected to and movable (e.g., sliding or rolling) on the corresponding guide support device 100. Both axial ends of each first floor panel 210 are slidably connected to the guide support device 100 via the first traction chain. The connection relationships between the first floor panels 210, the connection relationships between the first floor panels 210 and the first traction chains, the structure of the first traction chains, and the connection relationships between the first traction chains and the guide support devices 100 are all prior art and will not be described further in this application. For example, the first floor assembly 200 may have a structure substantially the same as the flexible chain floor assembly in patent application CN114042261A, the only difference being the shape. The flexible chain floor assembly in the patent application is a closed ring structure, while the first floor assembly 200 of this application is only a part of a ring structure and is not a closed structure. Figure 1 For the sake of simplicity, not all the first floor panels 210 included in the first floor assembly 200 and the openings for the treatment head to pass through are fully shown. Given the positional relationship between the second floor assembly 300 and the first floor assembly 200, only the two first floor panels 210 adjacent to the second floor assembly 300 are shown here, specifically the two first floor panels 210 located at both ends of the first floor assembly 200 in the circumferential direction, in order to more clearly show the adjacency relationship and layout between the two.
[0033] The second floor assembly 300 may include multiple second floor panels 320, multiple third floor panels 330, two second traction chains, and two third traction chains. Each second floor panel 320 and each third floor panel 330 corresponds one-to-one. Each second floor panel 320 and its corresponding third floor panel 330 extend axially and are spaced apart. The gap between each second floor panel 320 and its corresponding third floor panel 330 forms a window 310. The axial end of each second floor panel 320 away from its corresponding third floor panel 330 is referred to as the first axial end of the second floor panel 320, and the axial end of each second floor panel 320 near its corresponding third floor panel 330 is referred to as the second axial end of the second floor panel 320. Similarly, the axial end of each third floor panel 330 away from its corresponding second floor panel 320 is referred to as the first axial end of the third floor panel 330, and the axial end of each third floor panel 330 near its corresponding second floor panel 320 is referred to as the third axial end. The second axial end of the floor 330; the two second traction chains and the two third traction chains all extend circumferentially. The two second traction chains correspond one-to-one with the two guide support devices 100 and also one-to-one with the two first traction chains. The second traction chains are connected to the corresponding guide support devices 100 and can move on them. The first axial end of each second floor 320 is connected to one of the second traction chains, and the first axial end of each third floor 330 is connected to the other second traction chain. The circumferential ends of the second traction chains are respectively connected to the circumferential ends of the corresponding first traction chains to form a closed ring traction chain. The second axial end of each second floor 320 is connected to one of the third traction chains, and the second axial end of each third floor 330 is connected to the other third traction chain. The circumferential ends of the two third traction chains are connected to the first floor 210 of the first floor assembly 200 adjacent to the second floor assembly 300. In this way, the first floor assembly 200, the second floor assembly 300, and the transmission device 400 are interconnected to form a whole. As the treatment head rotates, it drives the first floor assembly 200 to rotate circumferentially along the guide wire support device 100. The first floor assembly 200 then rotates synchronously with the second floor assembly 300 (through the traction chains), and the transmission device 400 also rotates together. There is a gap between any two adjacent floor assemblies, allowing them to expand and contract relative to each other during rotation, thus preventing interference.
[0034] The second traction chain and the first traction chain can adopt the same structure, only their lengths may differ; for example, the structure of the traction chain in patent application CN114042261A can be used. Since the third traction chain is only used to sequentially connect the second axial ends of each second floor 320 or each third floor 330, without needing to cooperate with the guide support device 100, the structure of the third traction chain can be simpler than that of the first and second traction chains. For example, the third traction chain can only include multiple traction chain plates connected sequentially along the circumference, with adjacent traction chain plates able to rotate relative to each other, and the rotation axis is set on each second floor 320 or third floor 330.
[0035] Any two adjacent floorboards (e.g., two first floorboards, two second floorboards, two third floorboards, or a first floorboard and an adjacent second or third floorboard) can be connected by a connector that can rotate relative to the floorboards. This allows the connector to cover the gaps between the floorboards, preventing X-rays from passing through the gaps. For example, the connector can be the figure-eight connector described in patent application CN114042261A.
[0036] The transmission device 400 may include multiple transmission plates 410, each transmission plate 410 corresponding to each second floor 320 and each third floor 330. Each transmission plate 410 extends axially, and the two ends of each transmission plate 410 are connected to the second axial ends of the corresponding second floor 320 and the second axial ends of the corresponding third floor 330, respectively, to cover the gap between the second floor 320 and the third floor 330. The transmission plates 410 are arranged sequentially in the circumferential direction to cover the window 310.
[0037] The transmission plate 410 is made of a material that allows X-rays to pass through, while the first floor 210, the second floor 320, and the third floor 330 are made of materials that block X-rays from passing through. For example, the first, second, and third floors can be made of aluminum alloy, and the transmission plate 410 can be made of carbon fiber with a thickness of 1.5 mm. The X-ray transmittance can reach 94%, thus ensuring both strength and transmittance, achieving a balance between the two.
[0038] Since the transmission plate 410 needs to rotate synchronously with the treatment head, it will pass through different curved sections. Therefore, there is a gap between any two adjacent transmission plates 410, and there is also a gap between the transmission plate 410 adjacent to the first floor 210 and the first floor 210. This ensures contraction during rotation and ensures that the rotating floor can pass through the curved sections. A shielding member 220 may be provided on the first floor 210 adjacent to the transmission plate 410. The shielding member 220 may be located at the bottom of the first floor 210 to shield the gap between the transmission plate 410 and the first floor 210, preventing X-rays from leaking out from the gap. The two adjacent ends of any two adjacent transmission plates 410 are formed into a wedge structure, that is, both adjacent ends are formed into inclined surfaces, and the two inclined surfaces are arranged opposite each other. In this way, the two adjacent ends can be misaligned to achieve the effect of shielding the gap and preventing X-rays from leaking out from the gap between the two adjacent ends. If the gap is not blocked, the X-rays will have different transmittance (for example, 100% at the gap and 94% at the transmission plate 410). This will cause errors in X-ray imaging calculations and deteriorate the image quality. Therefore, by blocking the gap, X-rays can only pass through the transmission plate 410, thus ensuring that the transmittance is the same at all locations, that is, the X-rays passing through the transmission device 400 are uniform.
[0039] Fixing components 500 are provided on the second axial end of the second floor 320 and the second axial end of the third floor 330. The fixing components 500 are used to detachably connect the axial end of the transmission plate 410 to the second floor 320 or the third floor 330, so that the transmission plate 410 can be detached, which facilitates the maintenance and replacement of the X-ray source below the transmission plate 410.
[0040] like Figure 5 and Figure 6 As shown, the fixing assembly 500 includes a support frame 510, a base 520, and a fixing clip 530. The support frame 510 is fixed (e.g., by bolts) to the bottom of the second floor 320 or the third floor 330, the base 520 is fixed to the support frame 510, and the axial end of the transmission plate 410 is detachably mounted on the base 520 by the fixing clip 530. For example, the axial end of the transmission plate 410 can be clamped between the fixing clip 530 and the base 520, and then one or more bolts can be passed through the fixing clip 530, the transmission plate 410, and the base 520 in sequence to fix the three together; thus, the transmission plate 410 can be easily removed by tightening or loosening the bolts.
[0041] A fixed shaft 511 may be provided on the support frame 510, and the base 520 is sleeved on the fixed shaft 511, thereby fixing the base 520 to the support frame 510. An elastic element 512 may also be provided on the fixed shaft 511. The elastic element 512 is compressed between the base 520 and the support frame 510. The elastic element 512 will apply an elastic force to the base 520. When the transmission plate 410 is subjected to a compressive force along the axial direction of the fixed shaft 511, the base 520 can perform elastic movement on the fixed shaft 511, that is, the transmission plate 410 can perform elastic movement. This can prevent corner damage caused by collision between two adjacent transmission plates 410.
[0042] The X-ray source is fixed on the rotating gantry and located below the transmission window. The flat panel detector is fixed to the treatment head. The positions of the X-ray source, flat panel detector, and transmission window need to be planned in advance so that the X-rays emitted by the X-ray source can pass through the transmission window, then through the treatment table, and finally reach the flat panel detector for reception. Once the X-ray source, flat panel detector, and transmission window are installed in the planned positions, their relative positions will not change because they rotate synchronously with the rotating gantry. This means that the X-rays can always pass through the transmission window and reach the flat panel detector, thus achieving CBCT imaging. Multiple X-ray sources can be used to emit X-rays from multiple directions for imaging the patient; correspondingly, multiple flat panel detectors and transmission windows also need to be set up.
[0043] like Figure 7 As shown, the proton therapy device integrating a CBCT system may include two X-ray sources 610 and two flat panel detectors 620. The two X-ray sources 610 are fixed on a rotating gantry 710, and the two flat panel detectors 620 are fixed on a treatment head 720. Correspondingly, the rotating floor includes two transmission windows, with each X-ray source corresponding to one of the two transmission windows and each of the two flat panel detectors 620. The X-ray sources 610 are located below the transmission devices 400 of their respective transmission windows. X-rays emitted by the X-ray sources 610 can pass through the corresponding transmission devices 400, reach the patient 800, and then be received by the corresponding flat panel detectors 620 after passing through the patient 800. The rotating gantry 710 rotates synchronously with the X-ray sources 610, treatment head 720, flat panel detectors 620, and rotating floor, thereby irradiating different positions of the patient 800 with X-rays to image different positions of the patient 800.
[0044] The rotating floor with a transmission window in this embodiment of the invention allows X-rays to pass through while meeting the load-bearing strength requirements of the rotating floor, thereby enabling CBCT imaging on a proton therapy device.
[0045] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of this utility model. Various variations can be made to the above embodiments of this utility model. That is, all simple and equivalent changes and modifications made based on the claims and description of this utility model application fall within the protection scope of the claims of this utility model patent. Any aspects of this utility model not described in detail are conventional technical content.
Claims
1. A rotating floor having a transmission window, characterized in that, include: The two guide support devices are arranged in a closed ring shape and are parallel to each other; A first floor assembly is axially disposed between two guide support devices, with its two axial ends slidably connected to the two guide support devices respectively, and the first floor assembly defining an opening for the treatment head to pass through. The second floor assembly is axially disposed between the two guide support devices. The two ends of the second floor assembly are slidably connected to the two guide support devices respectively, and the two ends of the second floor assembly are connected to the two ends of the first floor assembly respectively, so as to form a closed annular floor. The second floor component defines a window; and A transmission device is connected to the second floor assembly and covers the window, the window and the transmission device forming the transmission window.
2. The rotating floor with a transmission window according to claim 1, characterized in that, The first floor assembly includes multiple first floor panels connected in sequence and two first traction chains respectively disposed at both ends of the first floor panels. The two first traction chains correspond one-to-one with two guide support devices. The first traction chains extend circumferentially and are connected to the corresponding guide support devices and can move on them. The two ends of each first floor panel are respectively connected to the two first traction chains.
3. A rotating floor with a transmission window according to claim 2, characterized in that, The second floor assembly includes multiple second floor panels, multiple third floor panels, two second traction chains, and two third traction chains. Each second floor panel and each third floor panel corresponds to one other. Each second floor panel and its corresponding third floor panel extend axially and are spaced apart. The gap between each second floor panel and its corresponding third floor panel forms the window. The axial end of each second floor piece that is away from the corresponding third floor piece is taken as the first axial end of the second floor piece, and the axial end of each second floor piece that is close to the corresponding third floor piece is taken as the second axial end of the second floor piece. The axial end of each third floor piece that is away from the corresponding second floor piece is taken as the first axial end of the third floor piece, and the axial end of each third floor piece that is close to the corresponding second floor piece is taken as the second axial end of the third floor piece. Two second traction chains and two third traction chains extend circumferentially. The two second traction chains correspond one-to-one with the two guide support devices and one-to-one with the two first traction chains. The second traction chain is connected to the corresponding guide support device and can move on it. The two circumferential ends of the second traction chain are respectively connected to the two circumferential ends of the corresponding first traction chain to form a closed loop traction chain. The first axial end of each second floor is connected to one of the second traction chains, and the first axial end of each third floor is connected to another second traction chain; the second axial end of each second floor is connected to one of the third traction chains, and the second axial end of each third floor is connected to another third traction chain; the circumferential ends of the two third traction chains are connected to the first floor of the first floor assembly adjacent to the second floor assembly.
4. The rotating floor with a transmission window according to claim 3, characterized in that, Any two adjacent floorboards are connected by a connector, the connector being rotatable relative to the floorboards and covering the gap between the floorboards; wherein the floorboards include a first floorboard, a second floorboard, and a third floorboard.
5. The rotating floor with a transmission window according to claim 3, characterized in that, The transmission device includes multiple transmission plates, each corresponding to a second floor and a third floor. Each transmission plate extends axially, and both ends of the axial direction of each transmission plate are connected to the second axial ends of the corresponding second floor and the second axial ends of the corresponding third floor, respectively, to cover the gap between the second floor and the third floor. The transmission plates are arranged sequentially in the circumferential direction to cover the window.
6. A rotating floor with a transmission window according to claim 5, characterized in that, There is a gap between any two adjacent transmission plates, and there is a gap between the transmission plate adjacent to the first floor and the first floor; a shielding member is provided on the first floor adjacent to the transmission plate to shield the gap between the transmission plate and the first floor.
7. A rotating floor with a transmission window according to claim 6, characterized in that, The two adjacent ends of any two adjacent transmission plates are formed as inclined surfaces, and the two inclined surfaces are arranged opposite each other so that the two adjacent ends are misaligned.
8. The rotating floor with a transmission window according to claim 5, characterized in that, Both the second axial end of the second floor and the second axial end of the third floor are provided with fixing components, which are used to detachably connect the axial end of the transmission plate to the second floor or the third floor.
9. A rotating floor with a transmission window according to claim 8, characterized in that, The fixing assembly includes a support frame, a base, and a fixing clip. The support frame is fixed to the bottom of the second floor or the third floor, the base is fixed to the support frame, and the axial end of the transmission plate is detachably mounted on the base via the fixing clip.
10. A rotating floor with a transmission window according to claim 9, characterized in that, The support frame is provided with a fixed shaft, and the base is sleeved on the fixed shaft; the fixed shaft is provided with an elastic element, which is compressed between the base and the support frame, so that the base performs elastic movement on the fixed shaft in response to the extrusion force on the transmission plate.