Radiotherapy positioning plate

Abstract

The present invention proposes a radiotherapy positioning plate, which relates to the technical field of radiotherapy equipment. A radiotherapy positioning plate includes a base plate, a headrest and a back plate. The headrest is detachably arranged on the top surface of the base plate. The back plate is hinged to the top surface of the base plate and is located on one side of the headrest. The base plate is provided with an adjustment mechanism for fixing the back plate. The base plate can fully place the human body on it, and the back of the human body is used in contact with the back plate. The height of the back plate can be adjusted by the adjustment mechanism, so as to ensure that the chest angle of different patients photographed in CT is adapted. At the same time, the present invention is small in size and easy to use, so that the device can be adapted to various CT calibers for shooting. The patient's head can be tilted back for diagnostic CT scanning. The head tilted back is conducive to protecting the esophagus and trachea, which can effectively shorten the patient's treatment time and reduce the work intensity of the staff.

Description

Technical Field

[0001] The present invention relates to the technical field of radiotherapy equipment, and in particular to a radiotherapy positioning plate. Background Art

[0002] Breast cancer is a malignant tumor that seriously endangers women's health. With the continuous improvement of the understanding of systemic treatment, breast cancer surgery is developing in the direction of shrinking the scope of resection. The treatment strategy of early invasive breast cancer has gradually transitioned from radical surgery and modified radical surgery to breast conservation. Local uncontrolled malignant tumors, recurrence and distant metastasis are the main reasons for the failure of radiotherapy. Postoperative radiotherapy is an important part of breast-conserving treatment for breast cancer.

[0003] Precision radiotherapy has emerged on the basis of the continuous development of computer and imaging technology and the continuous improvement of radiotherapy equipment. Precision radiotherapy requires precise positioning, precise planning, precise positioning, and precise irradiation. The representative technologies of precision radiotherapy are three-dimensional conformal radiotherapy (3D-CRT) and intensity modulated radiotherapy (IMRT). 3D-CRT can make the shape of the irradiation field consistent with the shape of the lesion in the three-dimensional direction, which is more suitable for convex target areas, but it is difficult to form an ideal dose distribution for concave target areas. IMRT can improve the dose distribution by highly conformal and uniform dose irradiation, reducing the irradiated volume of normal tissue, so as to achieve a higher therapeutic gain ratio. Precision radiotherapy planning not only requires that the high dose distribution in space must be consistent with the actual shape of the target area and the dose is adjustable, but also that its accuracy and repeatability in positioning are one of the key factors affecting the efficacy. Compared with conventional radiotherapy, they have great advantages in terms of uniform dose in the target area and protection of organs at risk.

[0004] Accurate positioning is an important guarantee for precise radiotherapy. Positioning errors will cause changes in the target dose. Studies have shown that when the dose changes by more than 3% to 5%, the efficacy of radiotherapy decreases and the adverse radiation reactions of normal organs increase. Precisely positioned body fixation equipment has gone through several stages, from plaster molds to vacuum molding, helmets, and then to thermal memory molding films.

[0005] However, the current positioning devices used for radiotherapy are large in size and complex in structure. The aperture of ordinary radiotherapy positioning CT is at least 80 cm, while the aperture of diagnostic CT is generally 68 cm. If the back is supported and the head cannot be tilted back, the diagnostic CT cannot scan the positioning CT. Hospitals without large-aperture CT cannot use breast positioning boards, resulting in low patient positioning accuracy, which greatly affects the radiotherapy effect and poor patient comfort. Summary of the invention

[0006] The object of the present invention is to provide a radiotherapy positioning plate, which can be used in conjunction with CTs of large and small apertures and has a simple structure and a small volume.

[0007] The embodiment of the present invention is achieved as follows:

[0008] An embodiment of the present application provides a radiotherapy positioning plate, comprising a base plate, a headrest and a back plate, wherein the headrest is detachably arranged on the top surface of the base plate, the back plate is hinged to the top surface of the base plate and is located on one side of the headrest, and the base plate is provided with an adjustment mechanism for fixing the back plate.

[0009] In some embodiments of the present invention, the adjustment mechanism comprises a plurality of support rods of different lengths hinged to the top surface of the base plate, and a slot for matching the plurality of support rods is provided at one end of the back plate away from the base plate.

[0010] In some embodiments of the present invention, the aforementioned adjustment mechanisms are multiple groups.

[0011] In some embodiments of the present invention, the support rod is arranged in an arc shape.

[0012] In some embodiments of the present invention, a stopper that abuts against the back plate is provided at one end of the support rod that engages with the slot.

[0013] In some embodiments of the present invention, the above also includes a holding mechanism disposed on the top surface of the bottom plate, and the holding mechanism is disposed on the other side of the back plate opposite to the position of the headrest.

[0014] In some embodiments of the present invention, the holding mechanism comprises a pair of gripping rods hinged to the base plate.

[0015] In some embodiments of the present invention, the top surface of the base plate is hinged to limited arm rods along two opposite sides of the headrest.

[0016] In some embodiments of the present invention, a mounting plate is provided at the bottom of the headrest, assembly notches are provided at two opposite edges of the mounting plate, and the bottom plate is provided with a clamping piece that engages with the assembly notches.

[0017] In some embodiments of the present invention, the radiotherapy positioning plate is made of carbon fiber.

[0018] Compared with the prior art, the embodiments of the present invention have at least the following advantages or beneficial effects:

[0019] The embodiment of the present application provides a radiotherapy positioning plate, including a base plate, a headrest and a back plate, wherein the headrest is detachably arranged on the top surface of the base plate, the back plate is hinged to the top surface of the base plate and is located on one side of the headrest, and the base plate is provided with an adjustment mechanism for fixing the back plate. The base plate can fully place the human body on it, and the back of the human body is used in contact with the back plate. The back plate can be adjusted in height by the adjustment mechanism, thereby ensuring that the angle of the chest taken by different patients in CT can be adapted, making the present invention more convenient to use. In the radiotherapy of breast cancer, the use of the radiotherapy positioning plate of the present invention can stabilize the patient's body position, quickly and accurately position the patient, and has good repeatability, which can effectively reduce the position error, and through the adjustment of the body position, make the metering distribution more reasonable, so that the dose of the target area is further increased and the dose of the surrounding normal tissue is significantly reduced, reducing the radiation dose to the patient's lung tissue. At the same time, the present invention is small in size and easy to use, so that the device can be adapted to various CT calibers for shooting, and the patient's head can be tilted back for diagnosis and CT scanning. The tilted head is conducive to protecting the esophagus and trachea, which can effectively shorten the patient's treatment time and reduce the work intensity of the staff.

[0020] In actual use, the height of the backboard is first adjusted according to the patient's height and the shooting position. The medical staff places the patient on the bottom board with the patient's back against the backboard. At this time, the patient's head is in a suspended state. The patient leans his head back and presses it against the headrest, and the entire device is sent into the CT scanner for shooting. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 This is a schematic diagram of the top view of the radiotherapy positioning plate according to an embodiment of the present invention;

[0023] Figure 2 This is a schematic diagram of a radiotherapy positioning board in a top view in use according to an embodiment of the present invention;

[0024] Figure 3 This is a schematic diagram of the side view structure of the radiotherapy positioning plate according to an embodiment of the present invention;

[0025] Figure 4 This is a schematic diagram of the support rod structure according to an embodiment of the present invention;

[0026] Figure 5 This is a side view of the radiotherapy positioning plate according to an embodiment of the present invention;

[0027] Figure 6 It is a schematic diagram of the structure of the fixing member described in an embodiment of the present invention.

[0028] Icons: 1-base plate; 101-support rod; 1011-stopper; 102-grip rod; 103-arm limit rod; 104-clamping piece; 2-headrest; 201-mounting plate; 2011-assembly notch; 3-back plate; 301-slot; 4-pipe fitting; 5-limiting groove; 6-fixing piece; 7-telescopic rod; 8-semicircular ruler. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0032] In the description of the embodiments of the present invention, it should be noted that if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the invented product is usually placed when used. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0033] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components must be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0034] In the description of the embodiments of the present invention, "plurality" means at least 2.

[0035] In the description of the embodiments of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" 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 it can be indirectly connected through an intermediate medium, or it can be the internal connection 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.

[0036] Example

[0037] Please refer to Figure 1 , Figure 2 , Figure 3 and Figure 5 , Figure 1 The figure is a schematic diagram of the top view of the radiotherapy positioning plate according to an embodiment of the present invention; Figure 2 The figure is a schematic diagram of the radiotherapy positioning board in the embodiment of the present invention when viewed from above; Figure 3 The figure is a schematic diagram of the side structure of the radiotherapy positioning plate according to an embodiment of the present invention; Figure 5 The figure shows a side view of the radiotherapy positioning plate according to an embodiment of the present invention; Figure 6 It is a schematic diagram of the structure of the fixing member described in an embodiment of the present invention.

[0038] An embodiment of the present application provides a radiotherapy positioning plate, including a base plate 1, a headrest 2 and a back plate 3. The headrest 2 is detachably arranged on the top surface of the base plate 1, the back plate 3 is hinged to the top surface of the base plate 1 and is located on one side of the headrest 2, and the base plate 1 is provided with an adjustment mechanism for fixing the back plate 3. The base plate 1 can fully place the human body on it, and the back of the human body is used in contact with the back plate 3. The height of the back plate 3 can be adjusted by the adjustment mechanism, so as to ensure that the chest angle of different patients photographed in CT is adapted, making the present invention more convenient to use. In the radiotherapy of breast cancer, the use of the radiotherapy positioning plate of the present invention can stabilize the patient's body position, quickly and accurately position the patient, and have good repeatability, which can effectively reduce the position error. Through the adjustment of the body position, the dosage distribution is more reasonable, so that the dose of the target area is further increased and the dose of the surrounding normal tissue is significantly reduced, thereby reducing the radiation dose to the patient's lung tissue. At the same time, the present invention is small in size and easy to use, so that the device can be adapted to various CT apertures for shooting, and the patient's head can be tilted back for diagnostic CT scanning. The head tilted back is beneficial to protecting the esophagus and trachea, which can effectively shorten the patient's treatment time and reduce the work intensity of the staff.

[0039] The bottom plate 1 in this embodiment is rectangular in shape. Setting the bottom plate 1 into a rectangle can make it arranged and placed in accordance with the extension direction from the head to the feet of the human body, and can effectively reduce the occupied space. The headrest 2 is arranged on the top surface of the left end of the bottom plate 1, and the headrest 2 is detachable and replaceable, so that the headrest 2 can be disassembled, maintained and replaced after being damaged. At the same time, the detachable headrest 2 can adjust the relative position installed on the top surface of the bottom plate 1, so as to adapt to the part of the head that contacts when different patients lean back. The middle part of the top surface of the bottom plate 1 is located on the right side of the headrest 2. A pipe 4 that is relatively perpendicular to the long side of the bottom plate 1 is provided, and a number of fixing members 6 for clamping the back plate 3 are evenly hinged on the pipe 4. The fixing members 6 are hinged on the pipe 4 to realize The back plate 3 is fixed on the bottom plate 1 by a screw thread, and the screw thread is fixed on the bottom plate 1 by a screw thread. The screw thread is fixed on the bottom plate 1 by a screw thread. The screw thread is fixed on the bottom plate 1 by a screw thread. The screw thread is fixed on the bottom plate 1 by a screw thread. The screw thread is fixed on the bottom plate 1 by a screw thread. The screw thread is fixed on the bottom plate 1 by a screw thread. The screw thread is fixed on the bottom plate 1 by a screw thread. The screw thread is fixed on the bottom plate 1 by a screw thread. The screw thread is fixed on the bottom plate 1 by a screw thread. The screw thread is fixed on the bottom plate 1 by a screw thread. The screw thread is fixed on the bottom plate 1 by a screw thread. The screw thread is fixed on the bottom plate 1 by a screw thread. The screw thread is fixed on the bottom plate 1 by a screw thread.

[0040] In actual use, the height of the backboard 3 is first adjusted according to the patient's height and the shooting position. The medical staff places the patient on the base plate 1 with the patient's back in contact with the backboard 3. At this time, the patient's head is in a suspended state. The patient leans his head back and presses it against the headrest 2, and the entire device is sent into the CT scanner for shooting.

[0041] In some embodiments of the present invention, Figure 1 and Figure 2 As shown, the adjustment mechanism includes a plurality of support rods 101 of different lengths hinged to the top surface of the base plate 1 , and a slot 301 for matching the plurality of support rods 101 is provided at one end of the back plate 3 away from the base plate 1 .

[0042] There are four support rods 101 in this embodiment, and the bottom ends of the four support rods 101 are hinged to the pipe fittings 4 arranged on the base plate 1, so that the support rods 101 can achieve a 180° rotation. The lengths of the four support columns decrease from left to right. The left side of the pipe fittings 4 is successively matched with the four support rods 101 to set limiting grooves 5, which can avoid the support rods 101 from rotating out of position and rotating unsmoothly for a long time. When the four support columns are respectively docked with the back plate 3, the angles formed by the back plate 3 and the base plate 1 are 9°, 11°, 13° and 15° respectively. These four degrees can be adapted for most patients.

[0043] In the above embodiments of the present invention, Figure 5 As shown, the adjustment mechanism includes a telescopic rod 7 hinged to the top surface of the base plate 1, and a slot 301 for clamping the end of the telescopic rod 7 is provided at one end of the back plate 3 away from the base plate 1. The telescopic rod 7 includes an inner rod and an outer rod. The inner rod is hinged to the top surface of the base plate 1, and a flat-head bolt is provided on the outer wall of the opening where the outer rod is sleeved with the inner rod. The inner rod can be used to contact the flat-head bolt to fix the telescopic length. The top of the inner rod of the telescopic rod 7 can be inserted into the slot 301 for fixation. The rotation angle between the back plate 3 and the base plate 1 is achieved by adjusting the length of the telescopic rod 7 to adapt to the use of different patients and body positions. A semicircular ruler 8 is provided at the pipe fitting 4 connected to the back plate 3, and its surface has an angle scale, so that medical staff can observe the scale to adjust the angle of the back plate 3.

[0044] In some embodiments of the present invention, the adjustment mechanism is in multiple groups.

[0045] The present invention has two groups of adjustment mechanisms, which are arranged side by side along the short side extension direction of the bottom plate 1. The two groups of adjustment mechanisms can make the back plate 3 more stable when connected, and can make the back plate 3 support a larger weight, thereby adapting to patients with heavier weight.

[0046] In some embodiments of the present invention, Figure 4 As shown, the support rod 101 is arranged in an arc shape. Arranging the support rod 101 in an arc shape can deflect the direct resistance force exerted by the back plate 3 on the bottom plate 1, and dispersing part of the force on the support rod 101 can effectively extend the service life of the bottom plate 1.

[0047] In some embodiments of the present invention, Figure 4 As shown, one end of the support rod 101 engaging the slot 301 is provided with a stopper 1011 that contacts the back plate 3. Stoppers 1011 are provided on the two opposite edges of the top of the support rod 101. When the top of the support rod 101 is inserted into the slot 301, the stoppers 1011 on both sides can further support the back plate 3, diffuse the contact surface, and thus reduce the extrusion force received by the support rod 101, thereby extending the service life of the support rod 101.

[0048] In some embodiments of the present invention, Figure 1 , Figure 2 , Figure 3 and Figure 5 As shown, the present invention also includes a gripping mechanism disposed on the top surface of the bottom plate 1, and the gripping mechanism is disposed on the other side of the back plate 3 opposite to the headrest 2. The gripping mechanism is disposed at the short edge of the left side of the top surface of the bottom plate 1 and is located on the left side of the headrest 2. When the patient lies on the back plate 3 of the present invention, his hands can be fixed on the gripping mechanism, which can further open the patient's chest position and enable the CT to be taken more clearly.

[0049] In some embodiments of the present invention, Figure 1 , Figure 2 , Figure 3 and Figure 5 As shown, the holding mechanism includes a pair of gripping rods 102 hinged to the base plate 1. The gripping rods 102 can be rotated along the extension direction of the short side of the base plate 1, so that the patient's two hands will not feel uncomfortable when they cross their gripping rods 102.

[0050] In some embodiments of the present invention, Figure 1 , Figure 2 , Figure 3 and Figure 5 As shown, the top surface of the bottom plate 1 along the two opposite sides of the headrest 2 are hinged with the limit arm rods 103. The limit arm rods 103 are arranged on both sides of the headrest 2, and can rotate along the long side direction of the bottom plate 1. The limit arm rods 103 can limit the position of the patient's arms to prevent the arm from swinging during the shooting process, which causes the CT shooting to be unclear. At the same time, some patients have difficulty raising their hands due to the influence of breast cancer. At this time, the patient only needs to slightly raise both hands and hold the limit arm rods 103, so that the chest position is opened so that the CT can be shot normally.

[0051] During use, when the user adjusts the corresponding position on the device, the position of the gripping rod 102 is adjusted so that the patient can raise his arms to grip the gripping rod 102, and the arm limiting rod 103 between the patient's arms and the torso is adjusted so that the patient's arms can be limited, thereby completing the fixation of the patient's position. By recording the positions of the gripping rod 102 and the arm limiting rod 103, a multi-point positioning record of the patient's position can be formed, which is convenient for repeating the position, thereby improving the radiotherapy effect. The present invention has a reasonable structure and an ingenious design. Through the setting of the holding mechanism, not only can the patient's position be fixed, but also the patient's position can be fixed. The patient's position is used for positioning and recording, which is convenient for repetition and improves the effect of radiotherapy. It can also support the patient, making it easier for him to maintain the same position during radiotherapy and improve the patient's comfort during radiotherapy. The setting of the gripping rod 102 and the arm limiting rod 103 can ensure that the patient can fully raise his arms to prevent them from blocking the chest, which is particularly suitable for radiotherapy of breast cancer. The characteristic setting of the gripping rod 102 and the arm limiting rod 103 being hinged to the base plate 1 allows them to rotate to meet the needs of patients of different sizes and has good applicability.

[0052] In some embodiments of the present invention, Figure 1 and Figure 2 As shown, a mounting plate 201 is provided at the bottom of the headrest 2 , and assembly notches 2011 are provided at the opposite edges of the mounting plate 201 . The bottom plate 1 is provided with a clamping piece 104 that is engaged with the assembly notches 2011 .

[0053] The mounting plate 201 in this embodiment is rectangular in shape, with five assembly notches 2011 provided along the opposite side edges of the mounting plate 201, and ten clips 104 matching the ten assembly notches 2011 are symmetrically provided on the top surface of the base plate 1. Medical staff can clip the mounting plate 201 to achieve fixation, and can also adjust the number of clips 104 for the assembly notches 2011 along the long side direction of the base plate 1 to achieve movement of the position of the headrest 2 to meet the needs of different patients.

[0054] In some embodiments of the present invention, the radiotherapy positioning plate is made of carbon fiber. Carbon fiber is a special fiber composed of carbon element. It has the characteristics of high temperature resistance, friction resistance, electrical conductivity, thermal conductivity and corrosion resistance. It is fibrous, soft, and can be processed into various fabrics. Because its graphite microcrystalline structure is preferentially oriented along the fiber axis, it has high strength and modulus along the fiber axis. The density of carbon fiber is small, so the specific strength and specific modulus are high. The main use of carbon fiber is as a reinforcing material to be compounded with resin, metal, ceramic and carbon to manufacture advanced composite materials. Carbon fiber reinforced epoxy resin composite materials have the highest specific strength and specific modulus among existing engineering materials. At present, the most common application form of carbon fiber materials in the medical field is as parts of radioactive inspection and treatment equipment, mainly including: carbon fiber composite bed panels for X-ray, CT and B-ultrasound, carbon fiber composite diagnostic headrests, and carbon fiber composite radiotherapy positioning plates. The radiotherapy positioning plate is an important carrier for patients during radiotherapy, used to support patients and stabilize body position. The radiotherapy positioning plate can allow rays to enter the lesion from any direction. The effect of the radiotherapy positioning plate made of metal on the attenuation of the patient's irradiation dose is more obvious. Carbon fiber materials have high radiation permeability, which is its most prominent advantage in application in radioactive medical equipment. Most of the radiotherapy positioning plates used on the market are mixed with metal, but the metal itself is not easy to be penetrated by x-rays, which will interfere with CT angiography and affect the doctor's reading. Except for the headrest 2, the entire present invention is made of carbon fiber material, so that the angiography has efficient penetration and the shooting is more stable and smooth.

[0055] In summary, an embodiment of the present invention provides a radiotherapy positioning plate, comprising a base plate 1, a headrest 2 and a back plate 3, the headrest 2 being detachably arranged on the top surface of the base plate 1, the back plate 3 being hinged to the top surface of the base plate 1 and being located on one side of the headrest 2, and the base plate 1 being provided with an adjustment mechanism for fixing the back plate 3. The base plate 1 can fully place the human body on it, and the back of the human body is used in contact with the back plate 3. The height of the back plate 3 can be adjusted by the adjustment mechanism, so as to ensure that the chest angle of different patients photographed in CT is adapted, making the present invention more convenient to use. In the radiotherapy of breast cancer, the use of the radiotherapy positioning plate of the present invention can stabilize the patient's body position, quickly and accurately position the patient, and have good repeatability, which can effectively reduce the position error. Through the adjustment of the body position, the dosage distribution is more reasonable, so that the dose of the target area is further increased and the dose of the surrounding normal tissue is significantly reduced, thereby reducing the radiation dose to the patient's lung tissue. At the same time, the present invention is small in size and easy to use, so that the device can be adapted to various CT apertures for shooting, and the patient's head can be tilted back for diagnostic CT scanning. The head tilted back is beneficial to protecting the esophagus and trachea, which can effectively shorten the patient's treatment time and reduce the work intensity of the staff.

[0056] In actual use, the height of the backboard 3 is first adjusted according to the patient's height and the shooting position. The medical staff places the patient on the base plate 1 with the patient's back in contact with the backboard 3. At this time, the patient's head is in a suspended state. The patient leans his head back and presses it against the headrest 2, and the entire device is sent into the CT scanner for shooting.

[0057] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A radiotherapy positioning plate, characterized in that: It comprises a bottom plate, a headrest and a back plate, wherein the headrest is detachably arranged on the top surface of the bottom plate, the back plate is hinged to the top surface of the bottom plate and is located on one side of the headrest, and the bottom plate is provided with an adjustment mechanism for fixing the back plate; The bottom plate is rectangular; The middle part of the top surface of the bottom plate is located on the right side of the headrest and is provided with a pipe fitting which is relatively perpendicular to the long side of the bottom plate, and the pipe fitting is evenly hinged with a fixing piece for clamping the back plate, and the fixing piece comprises a rectangular long plate, the left end of the long plate is hinged with the pipe fitting, three rectangular protrusions are provided on the same side wall surface of the right end of the long plate, and a through hole matching with the protrusion is provided at the edge of the back plate, the protrusion is clamped in the through hole and is bonded and fixed by structural adhesive, so that the back plate can be turned over on the bottom plate to ensure the smoothness of the rotation of the back plate and the stability of the connection with the bottom plate, and at the same time, a limiting groove matching with the fixing piece is provided on the left side of the pipe fitting, and a plurality of small holes distributed in an array are provided on the bottom plate between the headrest and the pipe fitting, the adjustment mechanism can be used to adjust the height of the back plate and can fix the back plate, and the top surface of the right end of the bottom plate is annularly provided with four clamps for fixing the vacuum pad; The adjustment mechanism comprises a plurality of support rods of different lengths hinged to the top surface of the bottom plate, and a slot for matching the plurality of support rods is provided at one end of the back plate away from the bottom plate; There are four support rods, and the bottom ends of the four support rods are hinged to the pipes arranged on the bottom plate, so that the support rods can achieve 180° rotation; The regulating mechanism comprises multiple groups; The support rod is a telescopic rod, and the telescopic rod includes an inner rod and an outer rod. The inner rod is hinged to the top surface of the bottom plate. The outer wall surface of the opening where the outer rod is sleeved with the inner rod is provided with a flat head bolt, and the inner rod can be abutted by the flat head bolt to fix the telescopic length. The top of the inner rod can be inserted into the slot for fixing. The angle of rotation between the back plate and the bottom plate can be achieved by adjusting the length of the telescopic rod to adapt to the use of different patients and body positions. A semicircular ruler is provided at the pipe fitting, and an angle scale is provided on its surface, so that medical staff can observe the scale to adjust the angle of the back plate; The support rod is arranged in an arc shape; One end of the support rod engaging with the clamping slot is provided with a stopper that abuts against the back plate.

2. A radiotherapy positioning plate according to claim 1, characterized in that: It also includes a holding mechanism arranged on the top surface of the bottom plate, and the holding mechanism is arranged on the other side of the back plate opposite to the position of the headrest.

3. A radiotherapy positioning plate according to claim 2, characterized in that: The holding mechanism includes a pair of gripping rods hingedly connected to the base plate.

4. A radiotherapy positioning plate according to claim 2, characterized in that: The top surface of the bottom plate is hingedly connected to limited arm rods along two opposite sides of the headrest.

5. The radiotherapy positioning plate according to claim 1, characterized in that: A mounting plate is arranged at the bottom of the headrest, and assembly notches are provided at the edges on both sides opposite to each other, and a clamping piece which is engaged with the assembly notches is arranged on the bottom plate.

6. A radiotherapy positioning plate according to claim 5, characterized in that: The radiotherapy positioning plate is made of carbon fiber.

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