A positioning platform system for patients with ocular tumors treated with proton and heavy ion radiotherapy

Abstract

The invention discloses a positioning platform system for patients with eye tumors undergoing proton and heavy ion radiotherapy, comprising a head fixing part for fixing the head to keep the position unchanged; an eye positioning component adopts an LED point light source array, and each LED lamp bead in the LED point light source array has an independent switch control; an eye tracking component adopts an eye movement capture unit, and the eye movement capture unit is arranged on a three-axis mobile frame to achieve adjustment of the three-dimensional position of the eye movement capture unit, and the eye movement capture unit is used to collect an iris position image; the eye positioning component is arranged just above the head fixing part, and the eye tracking component is arranged on the side of the head fixing part. The invention uses head positioning and eye positioning tracking in a matching manner, and can completely achieve the limit fixation of the human head and the fixation of the gaze position of the eye, and can reach or approach zero displacement.

Description

Technical Field

[0001] The invention relates to the field of radioactive medical equipment, and in particular to a positioning platform system for patients with eye tumors treated with proton and heavy ion radiotherapy. Background Art

[0002] Proton and heavy ion therapy is currently an advanced treatment technology in the field of radiotherapy. Since ions have the physical characteristics of the Bragg peak, most of the energy can be deposited in the Bragg peak area, while the dose in the incident area and the lateral and terminal areas of the beam is low, thereby reducing the irradiation dose of normal tissues around the target area. Carbon ions also have a high biological effect and have a good therapeutic effect on tumors that are insensitive to radiation.

[0003] Uveal melanoma is a rare malignant tumor of the eye, including choroidal melanoma, ciliary body melanoma and iris melanoma. The incidence rate in Europe is 5-7 cases per million people per year, and in Asia it is 0.4-0.6 cases per million people per year. The main treatments include enucleation, local excision, thermotherapy, photon radiotherapy, particle short-course radiotherapy, and ion radiotherapy. Radiotherapy has become the main treatment for eye tumors. There are literature reports that proton and heavy ion radiotherapy can provide better treatment effects in terms of tumor control, eye protection, vision and the incidence of adverse events.

[0004] The human eyeball will undergo involuntary movement, and the position of the eyeball may change at any time. During the radiotherapy of eyeball tumors, the rotation of the eyeball will cause the position of the tumor to change, which may affect the accuracy of treatment and even lead to treatment failure. Therefore, radiotherapy for eyeball tumors requires the eyeball to be fixed and basically consistent with the position of the eyeball during the planned CT scan, and the error should be within the acceptable range for clinical treatment. In conventional photon radiotherapy, the positioning of the eyeball is mainly completed by the patient staring at the light source. However, proton and carbon ion treatment of eyeball tumors generally adopts a single-field incidence method. The choice of incidence path may have a great impact on the irradiation dose of normal tissue. The position of the tumor (the gaze angle of the eyeball) determines the incidence path to a certain extent. Therefore, technical personnel in this field need to design a technical positioning that can solve or alleviate the above problems or some of the problems based on actual conditions. Summary of the invention

[0005] The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art and to provide a positioning platform system with a reasonable structural design for proton and heavy ion radiotherapy of patients with eye tumors.

[0006] The technical solution adopted by the present invention to solve the above problems is: a positioning platform system for patients with eye tumors treated with proton and heavy ion radiotherapy, comprising:

[0007] Head fixing parts: used to fix the head and maintain the head position;

[0008] Eyeball positioning component: using an LED point light source array, each LED lamp bead in the LED point light source array has an independent switch control; the eyeball positioning component is arranged above the patient's eyes;

[0009] The head fixing member and the eyeball positioning assembly are arranged on a fixed base plate on which the patient lies;

[0010] The fixed substrate is also provided with an eye tracking device, which includes an image acquisition device and a monitoring processing host;

[0011] The image acquisition device is arranged on a three-axis mobile frame, and the three-axis mobile frame comprises a supporting axis frame, an X-axis frame, a Y-axis frame and a Z-axis frame;

[0012] The LED point light source array is arranged on a mounting plate, and the mounting plate is arranged on supporting shaft frames on both sides. The mounting plate is provided with a groove body for accommodating the LED point light source array. A gap is provided between the side wall surface of the LED point light source array and the wall surface of the groove body. The side wall surface of the groove body is provided with a horizontal slide groove. The side wall surface of the LED point light source array is provided with a plurality of elastic components. One end of the elastic component is fixed to the LED point light source array, and the other end of the elastic component is slidably arranged on the horizontal slide groove. The side wall surface of the mounting plate is provided with adjusting bolts in the X-axis direction and the Y-axis direction through threaded cooperation, and the end of the adjusting bolt contacts the wall surface of the LED point light source array. The elastic component is a V-shaped elastic sheet, and the other end of the elastic component is provided with a sliding ball and is slidably arranged in the horizontal slide groove.

[0013] Further: the head fixing part includes a mouthpiece bracket, a thermoplastic mask and a mouthpiece, the edge of the thermoplastic mask is provided with a contour plate, the contour plate is fixed to the fixed base plate, the thermoplastic mask has windows at the eyes and the mouth, the mouthpiece bracket is arranged above the thermoplastic mask, the mouthpiece is arranged on the mouthpiece bracket and adapted to the mouth position of the patient lying on the fixed base plate, the mouthpiece is provided with an adjustment plate which is longitudinally slidably arranged on the slide groove of the fixed block of the mouthpiece bracket and fixed by a fixing part, and the mouthpiece is a mold of the patient's teeth using a plastic material;

[0014] Further: the image acquisition device is communicatively connected with the monitoring and processing host, and the monitoring and processing host is provided with a human-computer interactive display screen.

[0015] Further: the X-axis frame is horizontally and laterally arranged on the supporting axis frames on both sides, the Z-axis frame is slidably arranged on the X-axis frame and fixed by a fixing piece, the Z-axis frame is provided with an angle adjustment seat, the Y-axis frame is vertically arranged relative to the X-axis frame, is slidably arranged on the angle adjustment block of the angle adjustment seat and fixed by a fixing piece, an eye movement capture unit is arranged at the front end of the Y-axis frame, the X-axis frame is provided with an X-axis scale line to calibrate the position of the Z-axis frame relative to the X-axis frame, the Y-axis frame is provided with a Y-axis scale line to calibrate the position of the Y-axis frame relative to the X-axis frame, and the angle adjustment seat is provided with an angle scale line to calibrate the angle of the Z-axis frame relative to the Y-axis frame.

[0016] Further: the supporting shaft frame is provided with a sliding ring, the sliding ring is longitudinally slidably sleeved on the supporting shaft frame and fixed in position by a fixing piece, and the sliding rings are fixed on both sides of the X-axis frame and the mounting plate.

[0017] Further: the bite support or thermoplastic mask or support shaft frame is fixed to the fixed base plate by a detachable expansion buckle.

[0018] Further: the fixed base plate is provided with a headrest for supporting the head.

[0019] Further: the headrest includes a base and a support part, the support part is designed with a curved surface that adapts to the back of the head, the front end of the support part is hinged to the front end of the base, and adjustment rods are provided on both sides of the rear end of the support part. The two ends of the adjustment rod are respectively hinged to the support part and the base. The adjustment rod is composed of a first rod member, a second rod member and a rotating part. One end of the first rod member is hinged to the support part, the first rod member and the second rod member are matched by threads, one end of the second rod member is connected to the rotating part, and the rotating part is hinged to the base.

[0020] Further: the image acquisition device is a binocular high-definition zoom camera.

[0021] Compared with the prior art, the present invention has the following advantages and effects:

[0022] 1. The present invention uses head positioning and eye positioning tracking in combination, which can completely realize the limit fixation of the human head and the fixation of the gaze position of the eyeball, and can reach or approach zero displacement;

[0023] 2. By adjusting the position of the LED point light source array on the panel, the patient's eye gaze angle is changed to optimize the incident angle of the proton and carbon ion treatment plan and reduce the irradiation dose to normal tissues.

[0024] 3. This platform is used to collect real-time images of the eyeball using an image acquisition device, and the monitoring and processing host device is used to process the image to achieve eye tracking and eye positioning, and to quantify the involuntary movement distance of the eyeball within the obtained image frame, thereby achieving control of the eyeball offset distance during treatment. When the eyeball deviates by the expected distance within the area, the beam of the proton and heavy ion equipment is turned off, thereby ensuring that the eyeball receives an accurate irradiation dose and avoiding or reducing the irradiation beam of normal parts.

[0025] 4. This platform uses detachable expansion positioning pins to connect the bite bracket and the fixed base plate, which ensures the positioning accuracy and makes installation and disassembly faster, simplifying the technician's operation process. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of a positioning platform according to an embodiment of the present invention.

[0027] Figure 2 It is a structural schematic diagram of the mouthpiece arrangement according to an embodiment of the present invention.

[0028] Figure 3 It is a schematic diagram of the structure of the LED point light source array according to an embodiment of the present invention.

[0029] Figure 4 It is a schematic diagram of the installation structure of the LED point light source array according to an embodiment of the present invention.

[0030] Figure 5 It is a schematic structural diagram of a headrest according to an embodiment of the present invention.

[0031] Figure 6 This is a schematic diagram of the gating hardware structure of the proton and heavy ion device according to Example 2 of the present invention.

[0032] Figure 7 It is a schematic diagram of the process of gating the proton and heavy ion device according to Example 2 of the present invention.

[0033] Figure numbers: LED point light source array 2, LED lamp beads 21, fixed base plate 3, bite bracket 11, thermoplastic mask 12, bite device 13, contour plate 14, adjustment plate 15, image acquisition device 4, monitoring and processing host 5, human-computer interaction display screen 51, support axis frame 61, X-axis frame 52, Y-axis frame 63, Z-axis frame 64, angle adjustment seat 65, mounting plate 66, groove body 67, elastic component 68, adjustment bolt 69, sliding ball 60, sliding ring 611, headrest 16, base 161, support part 162, first rod 163, second rod 164, rotating part 165. DETAILED DESCRIPTION

[0034] The present invention will be further described in detail below with reference to the accompanying drawings and by way of examples. The following examples are intended to explain the present invention but the present invention is not limited to the following examples.

[0035] See also Figure 1-Figure 2 This embodiment provides a positioning platform system for proton and heavy ion radiotherapy of eye tumor patients, comprising:

[0036] Head fixing parts: used to fix the head and maintain the head position;

[0037] Eyeball positioning component: using LED point light source array 2, each LED lamp bead 21 in the LED point light source array 2 has independent switch control; the eyeball positioning component is arranged above the patient's eye;

[0038] The head fixing part and the eyeball positioning assembly are arranged on a fixing base plate 3 on which the patient lies.

[0039] Specifically, the head fixing part includes a mouthpiece support 11, a thermoplastic mask 12 and a mouthpiece 13. The edge of the thermoplastic mask 12 is provided with a contour plate 14, which is fixed to the fixed base plate 3. The thermoplastic mask 12 has windows at the eyes and the mouth. The mouthpiece support 11 is arranged above the thermoplastic mask 12. The mouthpiece 13 is arranged on the mouthpiece support 11 to adapt to the mouth position of the patient lying on the fixed base plate 3. The mouthpiece 13 is provided with an adjustment plate 15 which is longitudinally slidably arranged on the slide groove of the fixed block of the mouthpiece support 11 and is fixed by a fixing part. The mouthpiece 13 is a mold of the patient's teeth using a plastic material;

[0040] In the embodiment of this city, a thermoplastic mask 12 is combined with a mouthpiece 13 to make the patient's head highly stable, thereby better ensuring the accuracy of radiation irradiation. In this structure, the mouthpiece bracket 11 is in the shape of a gantry, which has higher space utilization, and the mouthpiece bracket 11 and the thermoplastic mask 12 are fixed to the fixed base plate 3 with detachable expansion buckles, which are firmly installed and easy to disassemble. The mouthpiece bracket 11 can be adjusted in the horizontal and vertical positions to meet the adaptability of different patients. Example

[0041] See also Figure 1-Figure 7 This embodiment specifically involves using this platform to adopt image recognition and positioning technology to achieve eye tracking and positioning in radiotherapy, so as to ensure the accuracy of beam therapy. Specifically, an eye tracking device is also provided on the fixed substrate 3. The eye tracking device includes an image acquisition device 4 and a monitoring and processing host 5. The image acquisition device 4 is communicatively connected with the monitoring and processing host 5. The monitoring and processing host 5 is provided with a human-computer interaction display screen 51.

[0042] The image acquisition device 4 is arranged on a three-axis mobile frame, and the three-axis mobile frame includes a support axis frame 61, an X-axis frame 52, a Y-axis frame 63 and a Z-axis frame 64. The X-axis frame 52 is horizontally arranged on the support axis frames 61 on both sides, and the Z-axis frame 64 is slidably arranged on the X-axis frame 52 and fixed by a fixing member. The Z-axis frame 64 is provided with an angle adjustment seat 65, and the Y-axis frame 63 is vertically arranged relative to the X-axis frame 52 and is slidably arranged on the angle adjustment block of the angle adjustment seat 65 and fixed by a fixing member. The front of the Y-axis frame 63 An eye movement capture unit is arranged at the end, the X-axis frame 52 is provided with an X-axis scale line for calibrating the position of the Z-axis frame 64 relative to the X-axis frame 52, the Y-axis frame 63 is provided with a Y-axis scale line for calibrating the position of the Y-axis frame 63 relative to the X-axis frame 52, and the angle adjustment seat 65 is provided with an angle scale line for calibrating the angle of the Z-axis frame 64 relative to the Y-axis frame 63. By utilizing this structure, the front and rear adjustment and angle adjustment of the image acquisition device can be realized, thereby adjusting the relative position of the eyeball and the image acquisition device 4, thereby adjusting the area of ​​the frame to obtain a suitable eye position frame image.

[0043] The specific steps of using this platform to track the eye position during proton and heavy ion beam therapy are as follows:

[0044] The following steps are involved:

[0045] (1) The head fixture is used on the treatment bed to position the patient's head using a fixture, an LED point light source array 2 is arranged above the eyeball, and the LED point light source array 2 has LED lamp beads 21 with individually controlled lighting functions arranged horizontally and vertically. An image acquisition device 4 is arranged above the eyeball to continuously acquire real-time images of eyeball movements, and the relative position of the image acquisition device 4 and the eyeball remains fixed;

[0046] Light up the LED lamp bead 21 just above the patient's eyeball for treatment, and the patient stares at the LED lamp just above the eyeball, so that the light source point where the LED light is projected is optimally located at the center of the iris of the eyeball (ensuring that in the initial state, staring is performed multiple times to determine the reference gaze position, and the position of the light source point mapped on the eyeball remains basically consistent. On the one hand, the position of the patient's gaze point is determined to be basically accurate, and on the other hand, the relative position of the patient to the reference gaze point directly in front is determined to be accurate, further ensuring that the position of the LED lamp bead for other treatments is accurate relative to the eyeball), thereby effectively establishing an accurate coordinate system, determining the reference point position of the eyeball relative to the LED array, and more accurately using the LED lamp bead corresponding to the LED array to position the eyeball. Therefore, in the actual process, due to position deviations of different people and fixed deviations, it is necessary to fine-tune the LED lamp bead 21 so that the light source point is located at the center of the iris. The specific implementation structure is that the LED point light source array 2 is arranged on a mounting plate 66, and the mounting plate 66 is provided Placed on the support shaft frames 61 on both sides, the mounting plate 66 is provided with a groove body 67 for accommodating the LED point light source array 2, a gap is provided between the side wall surface of the LED point light source array 2 and the wall surface of the groove body 67, the side wall surface of the groove body 67 is provided with a horizontal slide groove, and the side wall surface of the LED point light source array 2 is provided with a plurality of elastic components 68, one end of the elastic component 68 is fixed to the LED point light source array 2, and the other end of the elastic component 68 is slidably arranged on the horizontal slide groove, and the side wall surface of the mounting plate 66 is provided with an adjusting bolt 69 in the X-axis direction and the Y-axis direction through threaded matching, and the end of the adjusting bolt 69 contacts the wall surface of the LED point light source array 2, and the elastic component 68 is a V-shaped elastic sheet, and the other end of the elastic component 68 is provided with a sliding ball 60 and is slidably arranged in the horizontal slide groove. The adjusting bolt 69 in the horizontal and vertical directions is adjusted by the structure of this embodiment, and the eyeball gazes directly above, and the nearest group of LED lamp beads 21 is adjusted so that the light source point reflected by it is at the center position of the iris of the eyeball;

[0047] In the frame area of ​​the image captured by the image acquisition device 4, the actual diameter length of the iris is used as a reference to establish a reference coordinate system for eyeball movement, wherein the eyeball movement coordinate system adopts a two-dimensional coordinate system of a grid diagram; the center of the iris of the eyeball is used as the origin of the reference coordinate system;

[0048] The calibration formula of the reference coordinate system established in the image frame area is:

[0049] (Formula 1)

[0050] in,

[0051] is the pixel-to-length conversion scale factor,

[0052] is the actual or estimated diameter of the iris,

[0053] It is the number of pixels contained in the diameter of the iris that is automatically identified;

[0054] The actual length scale of the unit pixel of the image is obtained by obtaining the eyeball image through the image acquisition device 4 and identifying the iris. The average diameter of the human iris is 12 mm, which is slightly smaller for Asians, with an average of 11.4 mm. Therefore, in domestic clinical operations, 11.4 mm can be selected as the estimated diameter of the iris to facilitate the rapid characterization of the reference coordinate system.

[0055] (2) The patient stares at the LED lamp 21 corresponding to the treatment position, causing the eyeball to move, and the tumor site of the eyeball falls into the range of action of the proton and heavy ion beams, and the image acquisition device 4 continuously acquires real-time images of the eyeball movement;

[0056] (3) obtaining the coordinate values ​​of the iris center in the X direction and the Y direction in the reference coordinate system according to the real-time image of the eye movement, and obtaining the offset curves of the eye movement in the X direction and the Y direction;

[0057] The deviation formula between the real-time position of the iris center and the eye position at the treatment position is:

[0058] (Formula 2)

[0059] (Formula 3)

[0060] in,

[0061] and are the deviations between the real-time position of the eye movement in the X and Y directions and the eye position in the treatment position,

[0062] and They are the real-time coordinate values ​​of the center of the eyeball iris in the X and Y directions respectively.

[0063] and They are the reference coordinate values ​​of the iris center in the X and Y directions when the patient gazes at the treatment position.

[0064] (5) Based on the eye movement position at the treatment position, define the eye movement deviation threshold, determine the relationship between the deviation between the real-time eye position and the eye position at the treatment position and the defined deviation threshold, and output the determination result to the proton and heavy ion therapy system through the communication unit to output a gating signal;

[0065] Judgment logic: if the deviation between the real-time eye movement position and the eye position in the treatment position is within the set deviation threshold, the start or resumption of the proton and heavy ion beam is controlled; if the deviation between the real-time eye movement position and the eye position in the treatment position is outside the set deviation threshold, the interruption of the proton and heavy ion beam is controlled.

[0066] The headrest 16 described in this embodiment includes a base 161 and a support portion 162. The support portion 162 is designed to be curved to adapt to the back of the head. The front end of the support portion 162 is hinged to the front end of the base 161. Adjustment rods are provided on both sides of the rear end of the support portion 162. The two ends of the adjustment rod are respectively hinged to the support portion 162 and the base 161. The adjustment rod is composed of a first rod 163, a second rod 164 and a rotating portion 165. One end of the first rod 163 is hinged to the support portion 162. The first rod 163 and the second rod 164 are threaded. One end of the second rod 164 is connected to the rotating portion 165. The rotating portion 165 is hinged to the base 161. In this embodiment, the second rod 163 is synchronously rotated to adjust the headrest 161. 164, changing the relative position of the first rod 163 and the second rod 164, so as to change the angle of the headrest 16, realize the change of the angle of the patient's head relative to the plane of the treatment bed, thereby changing the relative position of the eye and the graphic acquisition device, ensuring that the collected image minimizes the excessive image distortion caused by the excessive relative angle between the collection surface of the camera of the image acquisition device 4 and the eyeball plane, affecting the accuracy of the reference established after image processing. The image acquisition device 4 is a binocular high-definition zoom camera, which uses a binocular ray head to collect images in two directions, and corrects the obtained images through the principle of three-dimensional spatial perspective distortion to obtain the normal corresponding size in the plane state, thereby better ensuring the coordinate accuracy of the coordinate system established by using graphics and improving the use effect.

[0067] In this embodiment, an image acquisition device 4 (camera) is used to obtain a real-time eyeball image, track and analyze the eyeball position, set the eyeball reference position, complete the scale of the actual length of the image unit pixel by identifying the iris, process the real-time eyeball movement displacement, and display the eyeball movement information in the form of a curve, the horizontal coordinate of the curve is time, and the vertical coordinate is the displacement parameters in the X direction and Y direction. Displacement thresholds in two directions are set on the curve. When the eyeball moves beyond the threshold setting range, the monitoring and processing host 5 sends a gating signal to the proton and heavy ion radiotherapy device to control the interruption of the proton and heavy ion beam; when the eyeball moves within the threshold setting range, the beam is restored. The processing host can also set the camera exposure, white balance, exposure time and other parameters through the software system. The monitoring and processing host 5 is provided with a touch screen for human-computer interaction. The communication unit interacts between the eyeball movement detection unit and the proton and heavy ion device, outputs a gating signal, and the control unit coordinates and controls the interruption and restoration of the proton and heavy ion device beam.

[0068] The platform utilizes a detachable expansion positioning pin to connect the bite bracket 11 (support shaft bracket 61) and the fixed base plate, which ensures the position accuracy while making installation and removal faster and simplifying the technician's operation process.

[0069] The above contents described in this specification are merely examples of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, as long as they do not deviate from the contents of the present specification or exceed the scope defined by the claims, they shall all fall within the protection scope of the present invention.

Claims

1. A positioning platform system for patients with ocular tumors treated with proton and heavy ion radiotherapy, characterized in that: include Head fixing parts: used to fix the head and maintain the head position; Eyeball positioning component: using an LED point light source array, each LED lamp bead in the LED point light source array has an independent switch control; the eyeball positioning component is arranged above the patient's eyes; The head fixing member and the eyeball positioning assembly are arranged on a fixed base plate on which the patient lies; The fixed substrate is also provided with an eye tracking device, which includes an image acquisition device and a monitoring processing host; The image acquisition device is arranged on a three-axis mobile frame, and the three-axis mobile frame comprises a support axis frame, an X-axis frame, a Y-axis frame and a Z-axis frame; The LED point light source array is arranged on a mounting plate, and the mounting plate is arranged on supporting shaft frames on both sides. The mounting plate is provided with a groove body for accommodating the LED point light source array. A gap is provided between the side wall surface of the LED point light source array and the wall surface of the groove body. The side wall surface of the groove body is provided with a horizontal slide groove. The side wall surface of the LED point light source array is provided with a plurality of elastic components. One end of the elastic component is fixed to the LED point light source array, and the other end of the elastic component is slidably arranged on the horizontal slide groove. The side wall surface of the mounting plate is provided with adjusting bolts in the X-axis direction and the Y-axis direction through threaded cooperation, and the end of the adjusting bolt contacts the wall surface of the LED point light source array. The elastic component is a V-shaped elastic sheet, and the other end of the elastic component is provided with a sliding ball and is slidably arranged in the horizontal slide groove.

2. The positioning platform system for proton and heavy ion radiotherapy of eye tumor patients according to claim 1, characterized in that: The head fixing device includes a bite bracket, a thermoplastic mask and a mouthpiece. A contour plate is arranged on the edge of the thermoplastic mask, and the contour plate is fixed to a fixed base plate. The thermoplastic mask has windows at the eyes and the mouth. The bite bracket is arranged above the thermoplastic mask. The mouthpiece is arranged on the bite bracket to adapt to the mouth position of the patient lying on the fixed base plate. The mouthpiece is provided with an adjustment plate which is longitudinally slidably arranged on the slide groove of the fixed block of the bite bracket and is fixed by a fixing device. The mouthpiece is a mold of the patient's teeth using a shaping material.

3. The positioning platform system for proton and heavy ion radiotherapy of eye tumor patients according to claim 1, characterized in that: The image acquisition device is in communication connection with a monitoring and processing host, and the monitoring and processing host is provided with a human-machine interactive display screen.

4. The positioning platform system for proton and heavy ion radiotherapy of eye tumor patients according to claim 1, characterized in that: The X-axis frame is horizontally and laterally arranged on the supporting axis frames on both sides, the Z-axis frame is slidably arranged on the X-axis frame and fixed by a fixing piece, the Z-axis frame is provided with an angle adjustment seat, the Y-axis frame is vertically arranged relative to the X-axis frame, is slidably arranged on the angle adjustment block of the angle adjustment seat and fixed by a fixing piece, an eye movement capture unit is arranged at the front end of the Y-axis frame, the X-axis frame is provided with an X-axis scale line to calibrate the position of the Z-axis frame relative to the X-axis frame, the Y-axis frame is provided with a Y-axis scale line to calibrate the position of the Y-axis frame relative to the X-axis frame, and the angle adjustment seat is provided with an angle scale line to calibrate the angle of the Z-axis frame relative to the Y-axis frame.

5. The positioning platform system for proton and heavy ion radiotherapy of eye tumor patients according to claim 1 or 4, characterized in that: The support shaft frame is provided with a sliding collar, which is longitudinally slidably sleeved on the support shaft frame and fixed in position by a fixing piece, and the sliding collars are fixed on both sides of the X-axis frame and the mounting plate.

6. The positioning platform system for proton and heavy ion radiotherapy of eye tumor patients according to claim 2, characterized in that: The bite bracket or the thermoplastic mask or the supporting shaft bracket is fixed on the fixed base plate by using a detachable expansion buckle.

7. The positioning platform system for proton and heavy ion radiotherapy of eye tumor patients according to claim 4, characterized in that: The fixed base plate is provided with a headrest for supporting the head.

8. The positioning platform system for proton and heavy ion radiotherapy of eye tumor patients according to claim 7, characterized in that: The headrest includes a base and a support part, the support part is designed with a curved surface adapted to the back of the head, the front end of the support part is hinged to the front end of the base, and adjustment rods are arranged on both sides of the rear end of the support part, the two ends of the adjustment rod are respectively hinged to the support part and the base, the adjustment rod is composed of a first rod member, a second rod member and a rotating part, one end of the first rod member is hinged to the support part, the first rod member and the second rod member are matched by threads, one end of the second rod member is connected to the rotating part, and the rotating part is hinged to the base.

9. The positioning platform system for proton and heavy ion radiotherapy of eye tumor patients according to claim 3, characterized in that: The image acquisition device is a binocular high-definition zoom camera.

Images