Positioning plate for cyber knife plan verification

Abstract

The utility model relates to the technical field of cyber knife plan verification, in particular to a positioning plate for cyber knife plan verification. The whole positioning plate for the cyber knife plan verification is a square transparent glass plate, a transverse axis and a vertical axis which intersect at the center position are marked on the positioning plate, a plurality of even number of marking holes are formed in the transverse axis and the vertical axis at intervals respectively, and each marking hole penetrates through the top face and the bottom face of the positioning plate for the cyber knife plan verification. The marking holes in the transverse axis and the marking holes in the vertical axis are symmetrically formed in the two sides of the center, and one positioning hole is formed in each of a pair of opposite angles of the positioning plate for cyber knife plan verification. The positioning plate for plan verification of the cyber knife can assist in accurately marking the position of the film when the cyber knife performs plan verification through superposition with the film, thereby being beneficial to completing two-dimensional plane dose measurement and subsequent two-dimensional plane verification.

Description

Technical Field

[0001] The utility model relates to the technical field of CyberKnife plan verification, in particular to a positioning plate for CyberKnife plan verification. Background Art

[0002] Cyber ​​Knife, also known as the "stereotactic Cyber ​​surgery platform", is the world's latest whole-body stereotactic radiosurgery treatment equipment. It does not require laser line positioning, and relies on real-time image registration before and during treatment. It uses a robotic arm to accurately project multiple beams of high-energy rays to the lesion area, so that the lesion area is irradiated with a high dose and the adjacent normal tissue is protected.

[0003] Before officially using CyberKnife to implement the treatment plan for the patient, in order to verify whether the radiotherapy dose delivery is accurate, plan verification measurement is required. At this time, the gold standard in the image registration phantom is collected for measurement, and the laser line system cannot be used. The plan verification compares the results calculated by the planning system with the actual beam output results of the machine. If the comparison value is within the allowable range, it means that the plan verification is passed.

[0004] At the same time, since CyberKnife has a complete set of end-to-end tests to verify the accuracy of the equipment, the manufacturer recommends that the plan verification result only has a point dose comparison. However, the national standard YY / T0889-2013 "Performance and Test Methods of Intensity Modulated Radiation Therapy Planning Systems" stipulates the accuracy of point dose calculation, dose distribution calculation accuracy, and treatment dose targets for intensity modulated radiation therapy planning systems. A complete set of plan verification includes one-dimensional point dose and two-dimensional plane dose. The CyberKnife plan is a typical intensity modulated radiotherapy plan, and it is also a SRS high-dose small field plan. Plan verification should not only have point dose results. Therefore, in order to meet the requirements of the national standard, it is urgent to design a component that can assist in the registration of the film plane and the planning system plane and perform two-dimensional plane verification. Utility Model Content

[0005] In order to solve the above technical problems, the utility model provides a positioning plate for CyberKnife plan verification which can assist in marking film positions and perform two-dimensional plane verification.

[0006] The utility model adopts the following technical solutions:

[0007] The utility model provides a positioning plate for CyberKnife plan verification, which is a square transparent glass plate as a whole, on which a horizontal axis and a vertical axis intersecting at a central position are drawn, and an even number of marking holes are respectively spaced apart along the horizontal axis and the vertical axis, each marking hole is arranged through the top and bottom surfaces of the positioning plate for CyberKnife plan verification, the marking holes on the horizontal axis and the marking holes on the vertical axis are symmetrically arranged on both sides of the center, and a positioning hole is respectively opened at a pair of diagonal positions of the positioning plate for CyberKnife plan verification.

[0008] Preferably, the positioning plate for CyberKnife plan verification is made of polymethyl methacrylate thermoplastic.

[0009] Preferably, the thickness of the positioning plate for CyberKnife plan verification is within 3 mm.

[0010] Preferably, the marking holes include four first marking holes and four second marking holes, two first marking holes are symmetrically arranged on the horizontal axis, and the other two first marking holes are symmetrically arranged on the vertical axis, two second marking holes are symmetrically arranged on the horizontal axis, and the other two second marking holes are symmetrically arranged on the vertical axis, and the spacing between the first marking holes and the center is 5 cm, and the spacing between the second marking holes and the center is 8 cm.

[0011] Preferably, the diameter of the marking hole is 1 mm.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] When the positioning plate for CyberKnife plan verification of the utility model is used, the positioning plate for CyberKnife plan verification is first fixed to the SDVP solid water phantom through the positioning hole, so as to clamp the film in cooperation with the SDVP solid water phantom, and then a CT scan is performed to obtain a CT image; then, the plan to be verified is imported into the image in the planning system for calculation to obtain a point dose and a surface dose; then, actual measurement is performed on the CyberKnife machine, and after the measurement is completed, four marking points are left on the film below with a hook pen through the marking hole, so that the development on the film is located in a rectangular space surrounded by the four marking points; finally, the marking points and the calculation plane are registered on the film analysis software, and the analysis result of the surface dose is obtained through gamma calculation.

[0014] Obviously, the CyberKnife plan verification positioning plate of the present invention can assist in accurately marking the film position when the CyberKnife performs plan verification by superimposing it with the film, thereby facilitating the completion of two-dimensional plane dose measurement and subsequent two-dimensional plane verification. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the top view of the positioning plate for CyberKnife plan verification in an embodiment of the utility model.

[0016] The reference numerals are described as follows:

[0017] 1. Horizontal axis

[0018] 2. Vertical axis

[0019] 3. Positioning holes

[0020] 4. First marking hole

[0021] 5. Second marking hole DETAILED DESCRIPTION

[0022] The following is a further detailed description of the specific implementations of the present invention in conjunction with the accompanying drawings. These implementations are only used to illustrate the present invention, but not to limit the present invention.

[0023] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0024] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" 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 a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] In addition, in the description of the present invention, unless otherwise specified, “plurality” means two or more.

[0026] See also Figure 1 The present embodiment provides a positioning plate for CyberKnife plan verification, which is a square transparent glass plate as a whole, on which a horizontal axis 1 and a vertical axis 2 intersecting at the center are drawn, and an even number of marking holes are spaced apart along the horizontal axis 1 and the vertical axis 2, respectively, each marking hole is arranged through the top and bottom surfaces of the positioning plate for CyberKnife plan verification, the marking holes on the horizontal axis 1 and the marking holes on the vertical axis 2 are symmetrically arranged on both sides of the center, and a positioning hole 3 is respectively opened at a pair of diagonal portions of the positioning plate for CyberKnife plan verification.

[0027] When the positioning plate for CyberKnife plan verification of this embodiment is used, the positioning plate for CyberKnife plan verification is first fixed to the SDVP solid water phantom through the positioning hole 3, so as to clamp the film in cooperation with the SDVP solid water phantom, and then a CT scan is performed to obtain a CT image; then the plan to be verified is imported into the image in the planning system for calculation to obtain the point dose and the surface dose; then actual measurement is performed on the CyberKnife machine, and after the measurement is completed, a hook pen is used to pass through the marking hole to leave four marking points on the film below, so that the development on the film is located in the rectangular space surrounded by the four marking points; finally, the marking points and the calculation plane are aligned on the film analysis software, and the analysis result of the surface dose is obtained by gamma calculation.

[0028] Obviously, the CyberKnife plan verification positioning plate of this embodiment can help accurately mark the film position when the CyberKnife performs plan verification by superimposing it with the film, thereby facilitating the completion of two-dimensional plane dose measurement and subsequent two-dimensional plane verification.

[0029] It should be noted that in order to observe the position of the film, the CyberKnife plan verification positioning plate of this embodiment must be made of transparent material; at the same time, the CyberKnife plan verification positioning plate of this embodiment must be fixed with the position of the SDVP solid water phantom when in use, and there must be no deviation. Therefore, when the threaded end diameter of the threaded fastener on the SDVP solid water phantom is 1 cm, the diameter of the positioning hole 3 on the CyberKnife plan verification positioning plate also corresponds to 1 cm, so as to facilitate the fixing of the CyberKnife plan verification positioning plate to the SDVP solid water phantom.

[0030] Preferably, the positioning plate for CyberKnife plan verification is made of polymethyl methacrylate thermoplastic. The positioning plate for CyberKnife plan verification is made of polymethyl methacrylate thermoplastic into a transparent organic glass plate, so that it can have excellent transparency, weather resistance, chemical resistance, mechanical properties and UV resistance according to the material properties of polymethyl methacrylate (PMMA).

[0031] Preferably, the thickness of the CyberKnife plan verification positioning plate is within 3 mm, so that both the liner pen and the needle can pass through this thickness to make marks, and will not affect the fixation of the nut on the SDVP solid water phantom for fastening the CyberKnife plan verification positioning plate and the film.

[0032] Preferably, in this embodiment, the thickness of the CyberKnife plan verification positioning plate is 3 mm. At this thickness, the CyberKnife plan verification positioning plate is strong enough and not easy to break, and both the liner pen and the needle can pass through this thickness to make a mark, which is a relatively suitable thickness.

[0033] Preferably, see Figure 1The marking holes include four first marking holes 4 and four second marking holes 5, two first marking holes 4 are symmetrically arranged on the horizontal axis 1, and the other two first marking holes 4 are symmetrically arranged on the vertical axis 2, two second marking holes 5 are symmetrically arranged on the horizontal axis 1, and the other two second marking holes 5 are symmetrically arranged on the vertical axis 2, and the spacing between the first marking hole 4 and the center is 5 cm, and the spacing between the second marking hole 5 and the center is 8 cm.

[0034] The first marking hole 4 and the second marking hole 5 are set with two marking holes at different distances from the center because the development position of the planned result on the film is usually in the center, and the development sizes are different. Therefore, when drawing the marking points with a liner pen, it should be done as little as possible without affecting the film results, while being as close to the development as possible to reduce errors. Therefore, two different marking holes are specially provided for marking. The four first marking holes 4 and the four second marking holes 5 can meet the actual use needs.

[0035] Preferably, the diameter of the marking hole is 1 mm. In order to enable the liner pen to accurately mark the developing position, the marking hole should be set as small as possible, but it is also necessary to ensure that the liner pen can pass through the marking hole to contact the film below, so the diameter of the marking hole is 1 mm to meet the above requirements at the same time.

[0036] Preferably, in this embodiment, in order to adapt to the size and dimensions of the SDVP solid water phantom, the CyberKnife plan verification positioning plate has a thickness of 3 mm, a length and width of 20 cm×20 cm, and two positioning holes 3 with a diameter of 1 cm, which are located at a pair of diagonal positions and are 2.5 cm and 3 cm away from the edge of the CyberKnife plan verification positioning plate.

[0037] The CyberKnife plan verification positioning plate of the utility model is used in conjunction with a line drawing pen to give an accurate position to the film measured plane, to align it with the planned plane dose, and then to obtain the plan verification result from the two-dimensional plane, making the verification result more reliable; at the same time, because the CyberKnife plan verification positioning plate is mounted on the SDVP solid water phantom to fix the film, the line drawing pen can be used to mark on the film before and after the verification, which is convenient and reliable.

[0038] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principle of the present invention. These improvements and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. A positioning plate for CyberKnife plan verification, characterized in that: The whole is a square transparent glass plate, on which a horizontal axis (1) and a vertical axis (2) intersecting at the center are drawn, and an even number of marking holes are spaced apart along the horizontal axis (1) and the vertical axis (2), each of which is arranged through the top and bottom surfaces of the positioning plate for CyberKnife plan verification, and the marking holes on the horizontal axis (1) and the marking holes on the vertical axis (2) are symmetrically arranged on both sides of the center, and a positioning hole (3) is respectively opened at a pair of diagonal positions of the positioning plate for CyberKnife plan verification.

2. The positioning plate for CyberKnife plan verification according to claim 1, characterized in that: The positioning plate for CyberKnife plan verification is made of polymethyl methacrylate thermoplastic processing.

3. The positioning plate for CyberKnife plan verification according to claim 1, characterized in that: The thickness of the positioning plate for CyberKnife plan verification is within 3 mm.

4. The positioning plate for CyberKnife plan verification according to claim 1, characterized in that: The marking holes include four first marking holes (4) and four second marking holes (5), two of the first marking holes (4) are symmetrically arranged on the horizontal axis (1), and the other two of the first marking holes (4) are symmetrically arranged on the vertical axis (2), two of the second marking holes (5) are symmetrically arranged on the horizontal axis (1), and the other two of the second marking holes (5) are symmetrically arranged on the vertical axis (2), and the distance between the first marking hole (4) and the center is 5 cm, and the distance between the second marking hole (5) and the center is 8 cm.

5. The positioning plate for CyberKnife plan verification according to claim 1, characterized in that: The diameter of the marking hole is 1 mm.

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