Treatment room positioning system, calibration method and laser beam verification phantom

Abstract

The present invention discloses a treatment room positioning system, a calibration method and a laser beam verification phantom, wherein the calibration method includes: installing a laser lamp; installing a mechanical isocenter tooling with a preset center reference object, the center reference object serving as a spatial physical representation of the isocenter position of the treatment system; installing a laser beam verification phantom on the center reference object, and making the isocenter position of the laser beam verification phantom coincide with the isocenter position of the treatment system; the laser beam verification phantom is preset with a positioning mark and a reflector; starting the laser lamp; adjusting the position of the laser lamp so that the laser beam emitted by the laser lamp coincides with the positioning mark, and the path of the laser beam reflected by the reflector coincides with the path of the laser beam emitted by the laser lamp. The laser beam verification phantom, the treatment room positioning system and the calibration method of the present invention are used to improve the installation accuracy of the laser lamp, ensure that the laser beams generated by multiple laser lamps intersect at the isocenter position, and effectively improve the accuracy of the proton therapy system in positioning patients.

Description

Technical Field

[0001] The present invention relates to the technical field of radiotherapy, and in particular to a laser beam verification phantom, a treatment room positioning system and a calibration method thereof. Background Art

[0002] Radiotherapy is one of the three methods of tumor treatment. A proton accelerator is a radiotherapy system that provides proton beams for tumor treatment. The system is used to lead the proton beam with a prescription dose and three-dimensional dose distribution provided by the treatment planning system to the patient's tumor target area to achieve the purpose of treatment. In the radiotherapy system, the proton beam is generated by the accelerator subsystem, passes through the lead-out channel, and then is adjusted by the treatment head subsystem to finally complete the beam output process.

[0003] In the treatment room, the proton beam is emitted toward the isocenter position of the treatment room. In order for the proton beam to accurately reach the patient's tumor target area, the patient's tumor target area must also be moved to the isocenter position of the treatment room. To facilitate the positioning of the patient's tumor center, the location of the tumor in the brain will be determined first during CT treatment of the patient, and then multiple marks will be made based on the isocenter position of the tumor. The multiple marks will cross the isocenter position of the tumor vertically. A corresponding treatment room positioning system is installed in the treatment room. The treatment room positioning system includes multiple laser lights to generate multiple laser beams, which intersect at the isocenter position of the treatment room. When positioning the patient's tumor target area, multiple laser beams can be vertically incident on the positions of multiple marks of the patient, thereby achieving the initial positioning of the patient.

[0004] Therefore, if the intersection of the laser beam does not intersect at the isocenter of the treatment room, the initial positioning of the patient will be greatly offset, which will be inconvenient for subsequent operations and even affect the effect of radiotherapy. Therefore, how to improve the installation accuracy of the laser lamp so that the laser beam accurately intersects at the isocenter of the treatment room is an urgent problem to be solved. Summary of the invention

[0005] The object of the present invention is to provide a treatment room positioning system, a calibration method and a laser beam verification phantom, which are used to improve the installation accuracy of laser lamps and ensure that the laser beams generated by multiple laser lamps intersect at the isocenter position.

[0006] The purpose of the present invention is achieved by the following technical solutions:

[0007] A calibration method for a treatment room positioning system, wherein the treatment room positioning system is used to assist in positioning a target area in a treatment system, the calibration method comprising:

[0008] Step S01: Install at least three laser lamps in the treatment room;

[0009] Step S02: installing a mechanical isocenter tooling on the treatment head, wherein the mechanical isocenter tooling presets a center reference object, and the center reference object serves as a spatial physical representation of the isocenter position of the treatment system to configure the treatment system;

[0010] Step S03: installing a laser beam verification phantom on the central reference object, retracting the treatment head and moving the isocenter position of the laser beam verification phantom to coincide with the isocenter position of the treatment system; the laser beam verification phantom has three mutually perpendicular surfaces, each surface is preset with a positioning mark and a reflective portion relative to the laser lamp, and the positioning mark is adapted to the shape of the laser beam emitted by the laser lamp; the laser beam verification phantom is provided with a mounting hole, and a virtual line between the isocenter position of the laser beam verification phantom and the mounting hole extends to the central position of the central reference object, and the virtual line between the isocenter position of the laser beam verification phantom and the mounting hole is set to be coaxial with the telescopic path of the treatment head;

[0011] Step S04: starting the laser light to emit cross laser beams toward the laser beam verification phantom in three mutually perpendicular directions;

[0012] Step S05: Determine whether the laser beam emitted by the laser lamp coincides with the positioning mark of the laser beam verification phantom, and whether the path of the laser beam reflected by the reflecting part coincides with the path of the laser beam emitted by the laser lamp. If both coincide, the position of the laser lamp is not adjusted; if one of them does not coincide, adjust the position of the laser lamp so that the laser beam emitted by the laser lamp coincides with the positioning mark of the laser beam verification phantom, and the path of the laser beam reflected by the reflecting part coincides with the path of the laser beam emitted by the laser lamp.

[0013] Preferably, the step S01 includes:

[0014] Using a position measuring instrument to locate a pair of installation positions with the same height and horizontal symmetry in the treatment system, each of the installation positions being equipped with a laser lamp;

[0015] And / or, a laser lamp is installed above the treatment system.

[0016] Preferably, the step S02 further includes:

[0017] Start the laser lamp and observe whether the laser beam emitted by the laser lamp intersects with the central reference object of the mechanical isocenter tooling.

[0018] Preferably, it also includes:

[0019] Step S06: remove the mechanical isocenter tooling and the laser beam verification phantom, turn on the laser light, and mark the projection position of the laser beam emitted by the laser light.

[0020] A laser beam verification phantom is used in any one of the above-mentioned calibration methods of the treatment room positioning system. The laser beam verification phantom has three mutually perpendicular surfaces facing the laser light, each of which is provided with a positioning mark and a reflecting part.

[0021] Preferably, the reflective portion is arranged at the center position of the corresponding surface of the laser beam verification phantom;

[0022] And / or, the reflecting part is a reflecting mirror.

[0023] Preferably, the positioning mark includes horizontal scale lines and vertical scale lines, the virtual intersection of the horizontal scale lines and the vertical scale lines is the center position of the corresponding surface of the laser beam verification model, and the virtual connecting lines of the horizontal scale lines and the vertical scale lines are a cross structure, and the cross structure and the reflecting part located on the same surface have a common center.

[0024] Preferably, the laser beam verification phantom is provided with a mounting hole, the mounting hole having the same structure as at least a portion of a center reference object of a center tooling such as a machine, and the mounting hole is used to enable the laser beam verification phantom to be accurately mounted on the center reference object.

[0025] A treatment room positioning system, the treatment room positioning system is used to perform any one of the above-mentioned treatment room positioning system calibration methods; the treatment room positioning system comprises:

[0026] Wall, with a preset installation position;

[0027] A plurality of laser lights are installed at the installation position of the wall;

[0028] For any one of the above laser beam verification phantoms, the isocenter position of the laser beam verification phantom is located at the intersection of the laser beams emitted by the multiple laser lamps.

[0029] Preferably, it further comprises a mechanical isocenter tooling, the mechanical isocenter tooling is used to be installed on the treatment head of the treatment system, and the laser beam verification phantom is installed on the mechanical isocenter tooling;

[0030] And / or, the installation position of the wall body is a mounting hole, and the mounting hole is a waist-shaped hole extending in the horizontal direction;

[0031] And / or, the laser light emits a cross laser beam.

[0032] Preferably, the laser beam verification phantom is provided with a positioning metal ball, the center of the positioning metal ball coincides with the isocenter position of the laser beam verification phantom, and the positioning metal ball is arranged as a physical representation of the isocenter position of the laser beam verification phantom.

[0033] Compared with the prior art, the beneficial effects of the present invention include at least:

[0034] By making the laser beam coincide with the positioning mark and the beam path of the laser beam reflected by the reflecting part coincide with the original path, it can be ensured that the laser beam is perpendicular to the corresponding surface of the laser beam verification phantom and perpendicular to the isocenter plane where the treatment system is located. At this time, the intersection of multiple laser beams is the isocenter position of the treatment system; the setting of the positioning mark and the reflecting part can relatively simply detect whether the laser beam position is accurate, facilitate the calibration of the laser beam position, and effectively improve the accuracy of the proton therapy system in positioning patients. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 is a schematic structural diagram of a treatment room positioning system according to an embodiment of the present invention when it is installed in a treatment room;

[0036] Figure 2 This is a structural schematic diagram of another perspective when the treatment room positioning system of an embodiment of the present invention is installed in the treatment room

[0037] Figure 3 is a partial exploded view of a wall and a laser lamp in a treatment room positioning system according to an embodiment of the present invention;

[0038] Figure 4 It is a schematic structural diagram of a treatment head, a mechanical isocenter tooling and a laser beam verification phantom when they are connected in an embodiment of the present invention;

[0039] Figure 5 is an exploded schematic diagram of a mechanical isocenter tool and a laser beam verification phantom according to an embodiment of the present invention;

[0040] Figure 6 4 is a cross-sectional view of a laser beam verification phantom according to an embodiment of the present invention.

[0041] In the figure: 1. Wall; 11. Mounting groove; 2. Laser light; 3. Laser beam verification model; 31. Positioning mark; 311. Horizontal scale line; 312. Vertical scale line; 32. Reflection part; 33. Mounting hole; 34. Positioning metal ball; 4. Mechanical isocenter tooling; 41. Base; 42. Center reference; 5. Position measuring instrument; 6. Treatment head. DETAILED DESCRIPTION

[0042] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided to make the present invention more comprehensive and complete and to fully convey the concepts of example embodiments to those skilled in the art. The same reference numerals in the figures represent the same or similar structures, and thus their repeated description will be omitted.

[0043] The words expressing position and direction described in the present invention are all explained by taking the accompanying drawings as examples, but they can be changed as needed, and all changes are included in the protection scope of the present invention.

[0044] Reference Figures 1 to 6 , corresponding to a treatment room positioning system of an embodiment of the present invention, which is formed in the treatment room, and a treatment system is installed in the treatment room, and the treatment system is used to perform radiotherapy on the patient's tumor located at the isocenter position. The treatment system can adopt an existing structure, such as a proton therapy system, which is not described here. The treatment room positioning system includes a wall 1, a laser lamp 2, a laser beam verification phantom 3 and a mechanical isocenter tooling 4.

[0045] Reference Figure 2 and Figure 3 , the wall body 1 and the laser lamp 2 can each include a plurality of walls, and the number of the wall bodies 1 can be the same as the number of the laser lamps 2, and each wall body 1 is pre-selected with an installation position, and each installation position can be used to install a laser lamp 2. Specifically, a mounting groove 11 is pre-opened on the wall body 1, and at least a part of the laser lamp 2 is installed in the mounting groove 11. Among them, the number of wall bodies 1 and laser lamps 2 can be the same as the number of marks pre-set according to the patient's tumor position, and the wall body 1 can be a structure such as a wall or ceiling in the treatment room. The wall body 1, the laser lamp 2, and the number of marks pre-set according to the patient's tumor position can all be set to at least three.

[0046] In order to make the laser lamp 2 adjustable after being installed on the wall 1, the installation groove 11 may be a waist-shaped groove, and the extension direction of the waist-shaped groove may be consistent with the direction in which the laser lamp 2 needs to be adjusted. For example, if the laser lamp 2 needs to be adjusted in the horizontal direction after being installed on the wall 1, the extension direction of the waist-shaped groove may be extended in the horizontal direction. In this case, the laser lamp 2 can be fixedly installed at multiple positions of the waist-shaped groove in the horizontal direction to adjust the position of the laser lamp 2. In addition, as needed, the installation groove 11 may also be set as a cross-shaped or other structured groove, so that the laser lamp 12 can be at multiple positions on the plane of the installation groove 11, thereby making the position of the laser lamp 12 adjustable in the horizontal and vertical directions.

[0047] In some specific embodiments, the wall 1, the laser light 2, and the number of pre-set marks according to the patient's tumor position are all three. The pre-set marks according to the patient's tumor position can be located on the left and right sides and the upper side of the tumor isocenter position. Correspondingly, the wall 1 can be the left and right walls and the ceiling of the treatment room, so that the laser light 2 installed on the wall 1 can correspond to the marks one by one. When the isocenter position of the patient's tumor coincides with the isocenter position in the treatment system, the patient has reached the treatment position, and then the treatment system can be controlled to perform radiotherapy on the patient.

[0048] The laser lamp 2 can emit a laser beam, specifically a cross laser beam, that is, the radial cross section of the laser beam is a cross structure, which can better realize the positioning of the isocenter position; the center position of the laser beam is the intersection position of the cross structure. The center positions of the laser beams emitted by multiple laser lamps 2 can intersect at the isocenter position of the treatment system.

[0049] Reference Figure 4 and Figure 5 The mechanical isocenter tooling 4 may include a base 41 and a center reference object 42. The base 41 is used to be installed on the treatment head 6 in the treatment room. The base 41 may specifically be a cross structure. The center reference object 42 is installed on the base 41, and may specifically be integrally formed with the base 41. The center reference object 42 may serve as a spatial physical representation of the isocenter position of the treatment system to guide the configuration of the treatment system, that is, when configuring a treatment system for radiotherapy in a treatment room, the treatment system is installed with the center reference object 42 as the isocenter position, so that after the treatment system is installed, the position of the center reference object 42 is the isocenter position of the treatment system. Among them, the center reference object 42 may be installed at the center position of the base 41. For example, when the base 41 adopts a cross structure, the center reference object 42 is set at the cross position of the cross structure.

[0050] Reference Figure 4 and Figure 5 The laser beam verification phantom 3 is mounted on the center reference object 42 on the mechanical isocenter tooling 4. The laser beam verification phantom 3 includes at least three mutually perpendicular surfaces, wherein the surface facing the laser lamp 2 is provided with a positioning mark 31 and a reflective portion 32, and the laser beam verification phantom 3 may also be provided with a mounting hole 33. The number of surfaces facing the laser lamp 2 may be the same as that of the laser lamp 2. For example, when there are three laser lamps 2, there are also three surfaces facing the laser lamp 2, and the three surfaces are mutually perpendicular and correspond to the three laser lamps 2 one by one. The mounting hole 33 may be provided on the surface of the laser beam verification phantom 3 that does not face the laser lamp 2; the mounting hole 33 has the same structure as or matches at least a portion of the center reference object 42 of the mechanical isocenter tooling 4, so that the mounting hole 33 can be used to accommodate at least a portion of the center reference object 42, and the wall forming the mounting hole 33 is in contact with the outer wall of the center reference object 42, so that the laser beam verification phantom 3 and the center reference object 42 remain fixed, thereby enabling the laser beam verification phantom 3 to be accurately mounted on the center reference object 42.

[0051] The virtual line between the isocenter position of the laser beam verification phantom 3 and the mounting hole 33 can extend to the center position of the central reference object 42, and the virtual line between the isocenter position of the laser beam verification phantom 3 and the mounting hole 33 can be coaxial with the telescopic path of the treatment head 6. Therefore, after the laser beam verification phantom 3 is installed on the central reference object 42, the isocenter position of the laser beam verification phantom 3 can be moved to the original position of the central reference object 42, that is, the isocenter position of the treatment system by telescoping the treatment head 6. The telescopic distance of the treatment head 6 can be the distance from the isocenter position of the laser beam verification phantom 3 to the center position of the central reference object 42.

[0052] In some specific embodiments, the central reference object 42 may be a hemispherical structure, and the center of the hemispherical structure corresponds to the isocenter position of the treatment room. The mounting hole 33 may be a hemispherical hole, and the diameter of the mounting hole 33 is the same as or similar to the diameter of the central reference object 42. The laser beam verification phantom 3 is a cubic structure, and the mounting hole 33 is formed concavely from one side of the laser beam verification phantom 3. At this time, the distance from the isocenter position of the laser beam verification phantom 3 to the center position of the central reference object 42 is half the side length of the laser beam verification phantom 3.

[0053] Reference Figure 6 In some specific embodiments, the laser beam verification phantom 3 may also be provided with a positioning metal ball 34, the center of which coincides with the isocenter of the laser beam verification phantom 3. The positioning metal ball 34 may be used as a physical representation of the isocenter position of the laser beam verification phantom 3; when the isocenter position of the laser beam verification phantom 3 coincides with the isocenter position of the treatment system, the positioning metal ball 34 may be used as a physical representation of the isocenter position of the treatment system. After the position adjustment of the treatment system is completed, it is necessary to regularly detect whether the components in the treatment system have moved, for example, once a month. At this time, the metal positioning ball 34 may be used as a physical representation of the isocenter position of the treatment system. The metal positioning ball 34 may be irradiated by the X-ray in the treatment system to form a projection, and the position of the metal positioning ball 34 in the formed projection image may be observed. If the position of the metal positioning ball 34 is at the center of the projection image, it is determined that the position in the treatment system has not moved. If the position of the metal positioning ball 34 is not at the center of the projection image, it is determined that the position in the treatment system has moved, and the positions of the components in the treatment system need to be recalibrated.

[0054] The positioning mark 31 is adapted to the shape of the laser beam emitted by the laser lamp 2. Specifically, the shape of the positioning mark 31 can be the same as at least a part of the structure of the radial cross-section of the laser beam, so that the positioning mark 31 can coincide with the laser beam; when the positioning mark 31 coincides with the laser beam, the center position of the positioning mark 31 can coincide with the center position of the laser beam. In addition, the line connecting the positioning mark 31 and the isocenter position of the laser beam verification phantom 3 is perpendicular to the plane where the positioning mark 31 is located. When the laser beam is irradiated to the corresponding surface of the laser beam verification phantom 3, the positioning mark 31 can be used as a reference mark to adjust the position of the laser beam so that the laser beam coincides with the positioning mark 31.

[0055] Reference Figure 4 and Figure 5 In some specific embodiments, the positioning mark 31 is a part of the radial cross-sectional shape of the laser beam. When the radial cross-sectional shape of the laser beam is a cross structure, the positioning mark 31 may include a horizontal scale line 311 and a vertical scale line 312, and the horizontal scale line 311 and the vertical scale line 312 are distributed on the four sides of the center position of the positioning mark 31, and the line connecting the horizontal scale line 311 and the vertical scale line 312 is a cross structure, and the cross structure is the same as the radial cross-sectional shape of the laser beam; in addition, the intersection point of the virtual connection line of the horizontal scale line 311 and the vertical scale line 312 can be the center position of the corresponding surface of the laser beam verification phantom 3, so that the line connecting the virtual intersection point and the isocenter position of the laser beam verification phantom 3 is perpendicular to the surface on which the positioning mark 31 is set.

[0056] The reflector 32 is used to verify whether the laser beam is perpendicular to the corresponding surface of the laser beam verification phantom 3. If the laser beam is not perpendicular to the corresponding surface of the laser beam verification phantom 3, and the extension path of the laser beam does not coincide with the line connecting the center position of the corresponding surface of the laser beam verification phantom 3 and its isocenter position, the laser beam cannot be accurately extended to the isocenter position of the laser beam verification phantom 3, and the intersection of multiple laser beams will not coincide with the isocenter position of the treatment room. The corresponding surface of the laser beam verification phantom 3 is provided with the reflector 32, and is used to receive the surface of the corresponding laser beam.

[0057] The reflective portion 32 is used to reflect the laser beam. The reflective portion 32 and the positioning mark 31 located on the same surface of the laser beam verification phantom 3 may have a common center. For example, the center position of the corresponding surface of the laser beam verification phantom 3 is the common center of the reflective portion 32 and the positioning mark 31. When the laser beam is perpendicular to the corresponding surface of the laser beam verification phantom 3 and passes through the isocenter position of the laser beam verification phantom 3, the reflective portion 32 will vertically reflect the laser beam, and the reflection angle of the laser beam at the reflective portion is 0°, so that the reflection path of the laser beam coincides with the original path (emission path) of the laser beam. At this time, only one path can be observed for the laser beam emitted by a laser lamp 2, that is, the reflection line of the laser beam cannot be seen. When the laser beam is not vertical but intersects the corresponding surface of the laser beam verification phantom 3 at a certain angle, the laser beam reflected by the reflective portion 32 will deviate from the original path of the laser beam. At this time, a laser beam emitted by a laser lamp 2 can not only observe the emission path of the laser beam, but also a reflection path, and the reflection line of the laser beam can be seen. The reflection path of the laser beam does not coincide with the original path of the laser beam. Therefore, it is necessary to adjust the laser beam so that the laser beam is perpendicular to the corresponding surface of the laser beam verification phantom 3. Among them, the reflective portion 32 can be specifically a reflector, and the reflective portion 32 can be set at the center of the corresponding surface of the laser beam verification phantom 3.

[0058] When the laser beam irradiates the corresponding surface of the laser beam verification phantom 3, the position of the laser lamp 2 is adjusted so that the laser beam emitted by the laser lamp 2 coincides with the positioning mark 31 on the corresponding surface of the laser beam verification phantom 3 and is perpendicular to the corresponding surface of the laser beam verification phantom 3. The multiple laser lamps 2 are adjusted by the above method. After the adjustment is completed, the intersection of the multiple laser beams emitted by the multiple laser lamps 2 is the isocenter position of the laser beam verification phantom 3, that is, the isocenter position of the treatment system.

[0059] The present invention also provides a method for calibrating a treatment room positioning system, which is applied to the above-mentioned treatment room positioning system. The calibration method includes steps S01 to S05, and may also include step S06. The method for calibrating a treatment room positioning system specifically includes:

[0060] Step S01: Install at least three laser lamps 2 in the treatment room.

[0061] Step S02: Install the mechanical isocenter tool 4 on the treatment head 6. The mechanical isocenter tool 4 presets a center reference object 42. The center reference object 42 serves as a spatial physical representation of the isocenter position of the treatment system to configure the treatment system.

[0062] Step S03: Install the laser beam verification phantom 3 on the central reference object 42, retract the treatment head 6 and move the isocenter position of the laser beam verification phantom 3 to coincide with the isocenter position of the treatment system; the laser beam verification phantom 3 has three mutually perpendicular surfaces, each surface is preset with a positioning mark 31 and a reflecting part 32 relative to the laser lamp 2, and the positioning mark 31 is adapted to the shape of the laser beam emitted by the laser lamp 2; the laser beam verification phantom 3 is provided with a mounting hole 33, and the virtual line between the isocenter position of the laser beam verification phantom 3 and the mounting hole 33 extends to the center position of the central reference object 42, and the virtual line between the isocenter position of the laser beam verification phantom 3 and the mounting hole 33 is set to be coaxial with the telescopic path of the treatment head 6.

[0063] Step S04: Start the laser lamp 2 to emit cross laser beams toward the laser beam verification phantom 3 in three mutually perpendicular directions.

[0064] Step S05: Determine whether the laser beam emitted by the laser lamp 2 coincides with the positioning mark 31 of the laser beam verification phantom 3, and whether the path of the laser beam reflected by the reflecting portion 32 coincides with the path of the laser beam emitted by the laser lamp 2. If both coincide, the position of the laser lamp 2 is not adjusted; if one of them does not coincide, adjust the position of the laser lamp 2 so that the laser beam emitted by the laser lamp 2 coincides with the positioning mark 31 of the laser beam verification phantom 3, and the path of the laser beam reflected by the reflecting portion 32 coincides with the path of the laser beam emitted by the laser lamp 2.

[0065] Step S06: remove the mechanical isocenter tooling 4 and the laser beam verification phantom 3, turn on the laser light 2, and mark the projection position of the laser beam emitted by the laser light 2.

[0066] Wherein, step S01 specifically includes: first, using the position measuring instrument 5 to determine a pair of installation positions of the same height and horizontal symmetry in the treatment system, specifically, a pair of installation positions of the same height and left-right symmetry in the treatment room. A pair of installation positions can be correspondingly set on the left and right walls of the treatment room. Each installation position is used to install a laser lamp 2. In addition, a mounting position can be set above the treatment room, and a laser lamp 2 is installed at the mounting position; the mounting position located above the treatment room can be set on the ceiling of the treatment room. By positioning a pair of horizontally symmetrical installation positions, a pair of laser lamps 2 installed at the pair of installation positions can be installed horizontally symmetrically, which is convenient for adjusting the position of the laser lamp 2; preferably, the laser lamp 2 is 1.23-1.29m away from the floor of the treatment room. Wherein, the position measuring instrument 5 can be a laser tracker. When determining the installation position, the projection of the approximate position on the wall can be obtained according to the approximate position of the center position of the treatment system, and the projection is used as the installation position. Among them, the approximate position of the center position of the treatment system can be determined according to the position of the treatment head 6. For example, the treatment head 6 is rotated to a 180° position, that is, the treatment head 6 is rotated to the floor of the treatment room, and the height direction of the treatment head 6 is perpendicular to the floor of the treatment room. The approximate position of the center position of the treatment system is slightly higher than the position of the treatment head 6, and then the position of the laser lamp 2 is adjusted in subsequent steps.

[0067] It should be noted that when the number of marks pre-set according to the patient's tumor position is set to more than three, for example, four or five, the number of laser lamps 2 can be set to four or five accordingly. When the number of laser lamps 2 is four, three of them are set on the left and right walls and ceiling of the treatment room, and the front wall or the rear wall of the treatment room can be set with an installation position, and another laser lamp 2 is installed at the installation position of the front wall or the rear wall; when the number of laser lamps 2 is five, three of them are set on the left and right walls and ceiling of the treatment room, and the front wall and the rear wall of the treatment room can be respectively set with installation positions, and the remaining two laser lamps 2 are respectively installed at the installation positions of the front wall and the rear wall. Among them, the pair of installation positions formed by the front wall and the rear wall of the treatment room can be a pair of installation positions with the same height and symmetry in the front and back in the treatment room, and the pair of installation positions with the same height and symmetry in the front and back can be the same height as the installation positions on the left and right walls of the treatment room.

[0068] After the laser lamp 2 is installed on the wall 1, an electronic display level is used to measure the horizontality and verticality of the laser lamp 2 compared to the wall or bottom of the treatment room, and the horizontality and verticality tolerance of the laser lamp 2 is maintained within 0.01 mm.

[0069] In step S02, the mechanical isocenter tool 4 can be installed on the treatment head 6 of the treatment room. After the mechanical isocenter tool 4 is installed on the treatment head 6, an electronic display level is used to measure the horizontality and verticality of the mechanical isocenter tool 4 compared to the wall or bottom of the treatment room, and the horizontality and verticality tolerance of the mechanical isocenter tool 4 is maintained within 0.01 mm. After the mechanical isocenter tool 4 is installed, the laser light 2 is started, and the position of the laser light 2 is roughly adjusted so that the laser beams emitted by multiple laser lights 2 intersect at the center reference object 42 of the mechanical isocenter tool 4 under visual conditions. Among them, the treatment head 6 can be rotated to a 180° position first to facilitate the installation of the mechanical isocenter tool 4. The position of the laser light 2 can be adjusted by fixing the laser light 2 at different positions of the mounting groove 11, thereby achieving flexible adjustment of the position of the laser light 2.

[0070] In step S03, the mounting hole 33 of the laser beam verification phantom 3 is adapted to the center reference object 42. After the laser beam verification phantom 3 is installed on the center reference object 42, an electronic display level is used to measure the horizontality and verticality of the laser beam verification phantom 3 compared to the wall or bottom of the treatment room, and the horizontality and verticality tolerance of the laser beam verification phantom 3 are kept within 0.01 mm. The treatment head 6 moves the isocenter position of the laser beam verification phantom 3 to the isocenter position of the treatment room by telescoping. The telescoping of the treatment head 6 can be controlled by a handle, which is a component in the treatment system that is connected to the treatment head 6 and is used to control the movement of the treatment head 6.

[0071] In step S05, through visual observation, when the cross laser beam emitted by the laser lamp 2 does not coincide with the positioning mark 31 of the cross-shaped structure, or the reflection path of the cross laser beam after being reflected by the reflective portion 32 does not coincide with the original path, it is determined that the position of the laser lamp 2 is not adjusted in place, and the position of the laser lamp 2 is continued to be adjusted. When the cross laser beam emitted by the laser lamp 2 coincides with the positioning mark 31 of the cross-shaped structure, and the reflection path of the cross laser beam after being reflected by the reflective portion 32 coincides with the original path, it is determined that the position of the laser lamp 2 is adjusted in place, and the adjustment of the laser lamp 2 can be stopped.

[0072] In step S06, the projection position of the laser beam is the position where the laser beam is projected onto the wall or bottom surface of the treatment room without being blocked. After recording the projection position of the laser beam, it is possible to observe in the subsequent process whether the projection position of the laser beam coincides with the recorded projection position, so that when the laser lamp 2 moves in the subsequent process, it can be quickly discovered according to the change in the projection position of the laser beam, and calibration can be performed to ensure that the laser beam emitted by the laser intersects at the isocenter position of the treatment room.

[0073] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, substitute and modify the above embodiments within the scope of the invention without departing from the principles and purpose of the present invention. All such changes should fall within the scope of protection of the claims of the present invention.

Claims

1. A method for calibrating a treatment room positioning system, wherein the treatment room positioning system is used to assist in positioning a target area in a treatment system, characterized in that: The calibration method comprises: Step S01: installing at least three laser lamps in a treatment room, wherein a position measuring instrument is used to locate a pair of installation positions with the same height and horizontal symmetry in the treatment system, each installation position is equipped with a laser lamp, and a laser lamp is installed above the treatment system; Step S02: installing a mechanical isocenter tooling on the treatment head, the mechanical isocenter tooling comprising a base and a center reference object, the base being used to be installed on the treatment head in the treatment room, the base being a cross structure; the center reference object being installed at the center position of the base; the treatment system being installed with the center reference object as the isocenter position, so that after the treatment system is installed, the position of the center reference object is used as the isocenter position of the treatment system, the center reference object being a hemispherical structure, the center of the hemispherical structure corresponding to the isocenter position of the treatment room; Step S03: installing a laser beam verification phantom on the central reference object, and retracting the treatment head to move the isocenter position of the laser beam verification phantom to coincide with the isocenter position of the treatment system; the laser beam verification phantom is a cubic structure and has three mutually perpendicular surfaces, each surface is preset with a positioning mark and a reflective portion relative to the laser light, the shape of the positioning mark is the same as at least a part of the structure of the radial cross-sectional shape of the laser beam, the center position of the positioning mark coincides with the center position of the laser beam, and the line connecting the positioning mark and the isocenter position of the laser beam verification phantom is perpendicular to the plane where the positioning mark is located; the positioning mark includes a horizontal scale line and a vertical scale line, and the virtual intersection point of the horizontal scale line and the vertical scale line is the center position of the corresponding surface of the laser beam verification phantom; the virtual intersection point and the laser beam verification phantom are connected. The connecting line of the isocenter position of the verification phantom is perpendicular to the surface where the positioning mark is set; the laser beam verification phantom is provided with a mounting hole, the mounting hole is formed by being concave from one side of the laser beam verification phantom, the mounting hole is a hemispherical hole, and the diameter of the mounting hole is the same as the diameter of the center reference object, the virtual connecting line between the isocenter position of the laser beam verification phantom and the mounting hole extends to the center position of the center reference object, and the virtual connecting line between the isocenter position of the laser beam verification phantom and the mounting hole is set to be coaxial with the telescopic path of the treatment head; wherein the reflecting part is a reflecting mirror, the reflecting mirror is used to reflect the laser beam to verify whether the laser beam is perpendicular to the corresponding surface of the laser beam verification phantom, the reflecting part is set at the center position of the corresponding surface of the laser beam verification phantom, and the reflecting part and the positioning mark located on the same surface of the laser beam verification phantom have a common center; Step S04: starting the laser light to emit cross laser beams toward the laser beam verification phantom in three mutually perpendicular directions; Step S05: Determine whether the laser beam emitted by the laser lamp coincides with the positioning mark of the laser beam verification phantom, and whether the path of the laser beam reflected by the reflecting part coincides with the path of the laser beam emitted by the laser lamp. If both coincide, the position of the laser lamp is not adjusted; if one of them does not coincide, adjust the position of the laser lamp so that the laser beam emitted by the laser lamp coincides with the positioning mark of the laser beam verification phantom, and the path of the laser beam reflected by the reflecting part coincides with the path of the laser beam emitted by the laser lamp.

2. The calibration method of the treatment room positioning system according to claim 1, characterized in that: The step S02 further includes: Start the laser lamp and observe whether the laser beam emitted by the laser lamp intersects with the central reference object of the mechanical isocenter tooling.

3. The calibration method of the treatment room positioning system according to claim 1, characterized in that: Also includes: Step S06: remove the mechanical isocenter tooling and the laser beam verification phantom, turn on the laser light, and mark the projection position of the laser beam emitted by the laser light.

4. A laser beam verification phantom, characterized in that: The laser beam verification phantom is applied to the calibration method of the treatment room positioning system as described in any one of claims 1 to 3, wherein the three mutually perpendicular surfaces of the laser beam verification phantom facing the laser light are respectively provided with positioning marks and reflecting parts; the shape of the positioning mark is identical to at least a part of the structure of the radial cross-sectional shape of the laser beam, the center position of the positioning mark coincides with the center position of the laser beam, and the line connecting the positioning mark and the isocenter position of the laser beam verification phantom is perpendicular to the plane where the positioning mark is located; the positioning mark includes a horizontal scale line and a vertical scale line, and the virtual intersection point of the horizontal scale line and the vertical scale line is located at the center position of the corresponding surface of the laser beam verification phantom; the reflecting part is A reflector, wherein the reflector is used to reflect the laser beam to verify whether the laser beam is perpendicular to the corresponding surface of the laser beam verification phantom, the reflective portion is arranged at the center position of the corresponding surface of the laser beam verification phantom, and the reflective portion and the positioning mark located on the same surface of the laser beam verification phantom have a common center; the laser beam verification phantom is provided with a mounting hole, the mounting hole is formed inwardly from one side of the laser beam verification phantom, the mounting hole is a hemispherical hole, and the diameter of the mounting hole is the same as the diameter of the center reference object, the virtual line between the isocenter position of the laser beam verification phantom and the mounting hole extends to the center position of the center reference object, and the virtual line between the isocenter position of the laser beam verification phantom and the mounting hole is arranged to be coaxial with the telescopic path of the treatment head.

5. The laser beam verification phantom according to claim 4, characterized in that: The virtual connection line between the horizontal scale lines and the vertical scale lines is a cross structure, and the cross structure and the reflecting part located on the same surface have a common center; the cross structure has the same radial cross-sectional shape as the laser beam, and the horizontal scale lines and the vertical scale lines are distributed on the upper, lower, left and right sides of the center position of the positioning mark, so that the connection line between the virtual intersection and the isocenter position of the laser beam verification model is perpendicular to the surface where the positioning mark is set.

6. A treatment room positioning system, characterized in that: The treatment room positioning system is used to perform the calibration method of the treatment room positioning system according to any one of claims 1 to 3; the treatment room positioning system comprises: Wall, with a preset installation position; A plurality of laser lights are installed at the installation position of the wall; The laser beam verification phantom according to any one of claims 4 to 5, wherein the isocenter position of the laser beam verification phantom is located at the intersection of the laser beams emitted by the plurality of laser lamps.

7. The treatment room positioning system according to claim 6, characterized in that: It also includes a mechanical isocenter tooling, the mechanical isocenter tooling is used to be installed on the treatment head of the treatment system, and the laser beam verification phantom is installed on the mechanical isocenter tooling; And / or, the installation position of the wall body is a mounting groove, and the mounting groove is a waist-shaped hole extending in the horizontal direction.

8. The treatment room positioning system according to claim 6, characterized in that: The laser beam verification phantom is provided with a positioning metal ball, the center of the positioning metal ball coincides with the isocenter position of the laser beam verification phantom, and the positioning metal ball is set as a physical representation of the isocenter position of the laser beam verification phantom.

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