Device for verifying precision of laser lamp and image system

Abstract

The invention belongs to the technical field of radiation radiotherapy equipment, and provides a device for verifying the precision of a laser lamp and an image system. The device comprises a slide rail type CT, a verification device and a laser lamp group, the laser lamp group comprises at least two cross laser lamps and at least one linear laser lamp, the verification device comprises a cube body model and a target ball, and the top surface and the side surface of the cube body model are provided with cross scale marks and inlay holes. The cross scale line passes through the center of each surface and the midpoint of each side line, the inlay holes comprise a central inlay hole and a first inlay hole, the central inlay hole is formed in the center of the cross scale line, the first inlay hole is formed in the position, with the equal distance from the central inlay hole, of the cross scale line, and the inlay holes are matched with a target ball. The invention aims to provide an intermediate intervention device to evaluate whether the laser lamp is deviated or the treatment bed is deviated; in the subsequent quality inspection and quality assurance process, the laser lamp and the image system can be verified at the same time by placing the intermediate intervention device again.

Description

Technical Field

[0001] The invention belongs to the technical field of radiation therapy equipment and provides a device for verifying the accuracy of a laser lamp and an imaging system. Background Art

[0002] In the radiotherapy industry, laser lights and imaging systems are core equipment for ensuring treatment accuracy, safety, and individualization. They work closely together to precisely irradiate the tumor target and maximize the protection of normal tissue. Laser lights are primarily used for patient positioning and spatial calibration in radiotherapy, serving as a visual physical coordinate system. Laser lights are mounted on the walls and ceiling of the treatment room. These lights project markers onto the patient's body surface, with intersections in space also pointing to intersections in the image. Laser lines provide a spatial reference for imaging equipment such as CT and CBCT machines, ensuring consistency between the imaging and treatment coordinate systems. After the initial installation and commissioning, subsequent quality assurance typically involves verifying the accuracy of the treatment bed and images using laser lights, or verifying whether the laser light has deviated using a device fixed to the bed's base. JP2021034316 discloses an X-ray CT device for three-dimensional shape measurement and length measurement error assessment. The device comprises a base and multiple spheres arranged in the base's XYZ space, meeting the following requirements: Multi-plane sphere configuration: Four outer spheres are arranged in each of at least three XY planes with different Z positions, forming a symmetrical "cross" layout with 30 mm spacing in the Z direction. Inner spheres: Three spheres are arranged near the Z axis (radius ≤ 10 mm) to form a linear reference in the Z direction. The support rod fixing mechanism utilizes a five-point constraint structure consisting of a "wedge sample block + cylindrical component + load-bearing bolt" to fully secure the support rod for translation in the XY plane, translation in the Z axis, and rotation. The sphere-support rod connection utilizes a conical recess (45° angle) at the top of the support rod to which the spheres are attached using a thin layer of adhesive. A glue hole is provided at the bottom of the recess to minimize adhesive shrinkage. The inventors believe there is significant room for improvement. Summary of the Invention

[0003] The present invention aims to provide an intermediate interventional device to assess whether the problem lies with the laser light or the treatment couch. Furthermore, during subsequent quality inspections and quality assurance, the intermediate interventional device can be repositioned to simultaneously verify both the laser light and the imaging system. The initial fixed position of the cube phantom, which serves as the interventional device, can be freely adjusted. The cube phantom can be embedded with multiple target spheres and is more easily and securely clamped and placed in the working position of a slide-type CT scan.

[0004] A device for verifying the accuracy of laser lights and imaging systems includes a sliding track CT scan, a verification device, and a laser light assembly. The laser light assembly includes at least two cross laser lights and at least one straight laser light. The verification device includes a cube phantom and a target sphere. The top and side surfaces of the cube phantom are provided with cross-scale lines and inlay holes. The cross-scale lines pass through the center of each face and the midpoint of each edge. The inlay holes include a center inlay hole and a first inlay hole. The center inlay hole is provided at the center of the cross-scale line, and first inlay holes are provided on the cross-scale line at equal distances from the center inlay hole. The inlay holes match the target sphere. The straight laser light is opposite the sliding track CT scan, and its vertical laser line coincides with the center point of the image. The cross laser light has two laser lines. The horizontal laser line must coincide with the horizontal line on the cube phantom, and the vertical line must be adjusted to coincide with the vertical laser line of the cube. Each cross-scale line has an inlay hole of the same size to accommodate the laser tracker target sphere and tungsten sphere. Using a cube phantom and target sphere as interventional devices, the treatment and imaging coordinate systems of the laser and slide-type CT systems can be simultaneously evaluated. The cube phantom is engraved with a crosshair mark, which serves as a reference for laser lamp commissioning. Subsequent daily quality inspections and quality assurance can be performed by placing the cube phantom and target sphere in a fixed position, laser positioning, and scanning the phantom and target sphere, verifying whether the laser and treatment couch are deflected. This reduces theoretical calculation and calibration time. The cube phantom can be embedded with multiple target spheres, and their positions are precisely defined, eliminating operational errors associated with target placement. Multiple position data can be obtained during a single CT scan and laser tracker operation, enabling verification of the treatment and imaging coordinate systems of the laser and slide-type CT systems. Furthermore, the target sphere is easily and securely mounted and positioned in the slide-type CT system's operating position, enabling simultaneous verification of the laser and imaging systems. The target sphere is located within the mounting hole. Compared to target sphere placement via support rods, this eliminates the potential for sphere center position deviation or distorted X-ray transmission images caused by inaccurate machining of the support rod tip recess, the use of thin shafts made of different materials, and adhesives.

[0005] Preferably, the first inlay hole is close to the edge of the face of the cube phantom where it is located, and the first inlay hole is located 2 / 3 of the way from the center inlay hole to the edge. The first inlay hole is also used to accommodate the laser tracker target ball and the tungsten ball. The laser tracker takes the point corresponding to the laser tracker target ball on the cube phantom. Since the positions of the first inlay hole and the center point of the cube phantom are fixed, the difference in spatial position between the center point of the cube phantom and the set image point can be known. By knowing these differences, the support adjustment device can be adjusted so that the center of the cube phantom coincides with the set image center. After adjustment, the slide CT can be operated to move a fixed distance to scan the cube phantom. The difference between the image center of this position and the set image center can be known through tungsten ball imaging. This difference can be achieved by adjusting the CT for the first time. The center of the cube phantom is also the image center that needs to be set for the patient's tumor.

[0006] Preferably, the laser light group is arranged on the side of the cube phantom, and the laser paths of the cross laser light and the straight laser light pass through the center of the corresponding surface of the cube phantom, and the intersection of the laser paths of the cross laser light and the straight laser light coincides with the center point of the cube phantom. The intersection of the two cross laser lights and the straight laser light coincides with the center point of the cube phantom. When the sliding CT moves to the corresponding position, it also coincides with the image center. During the verification process of the radiotherapy equipment, the target ball is placed in the designed inlay hole. By positioning these target balls through CT images, it can be verified whether the mechanical isocenter, radiation isocenter and image isocenter of the sliding CT are consistent.

[0007] Preferably, the verification device also includes a support and adjustment device, a transfer plate is provided on the top of the support and adjustment device, one end of the transfer plate is fixed to the cube phantom, the bottom of the support and adjustment device is fixed to the ground, and the extension direction of the transfer plate is parallel to the moving direction of the sliding CT. The bottom of the sliding CT has a guide rail, which can move along the line close to the cube phantom and away from the cube phantom. The sliding CT cannot move to the corresponding position to scan the cube phantom. The main function of the sliding CT and the transfer plate is to break through the space limitation. When the patient is treated, the patient's tumor site is first moved to the imaging position. Due to space limitations, our imaging position is set at a position that can be reached by the bed board of the sliding CT. After scanning the lesion, it is moved to the treatment position of the beam outlet. After scanning, the sliding CT moves to the initial position.

[0008] Preferably, the support adjustment device includes a degree of freedom adjustment mechanism connected to an adapter plate. The degree of freedom adjustment mechanism includes at least two horizontally stacked adjustment plates, the adjustment plates being parallel to the adapter plate. The top surface of the degree of freedom adjustment mechanism is fixed to the adapter plate. Adjacent adjustment plates are divided into an upper adjustment plate and a lower adjustment plate. The connection between the upper and lower adjustment plates has at least one adjustable degree of freedom. Furthermore, the connection between the upper and lower adjustment plates has only one adjustable degree of freedom, and different combinations of adjacent upper and lower adjustment plates have different degrees of freedom.

[0009] Through the above settings, only one degree of freedom is changed for a set of upper and lower adjustment plates. When adjusting one degree of freedom, the other degrees of freedom of the cube phantom are not affected, making it convenient to accurately adjust the spatial position of the cube phantom.

[0010] Preferably, the lower adjustment plate is equipped with a pin mechanism that abuts the side of the upper adjustment plate, with at least two pin mechanisms located on each side of the upper adjustment plate. By varying the length of the pin mechanism's abutment at different locations on the side of the upper adjustment plate, the angle of horizontal rotation of the upper adjustment plate about the vertical axis and the relative position of the upper adjustment plate can be adjusted, thereby enabling spatial movement of the cube phantom.

[0011] Preferably, the upper adjustment plate is provided with a waist-drum-shaped chute, within which a cylindrical pin is disposed to connect the upper and lower adjustment plates. The combination of the waist-drum-shaped chute and the cylindrical pin allows the upper adjustment plate to rotate horizontally about a vertical axis and move horizontally relative to the lower adjustment plate, while maintaining a secure connection between the upper and lower adjustment plates.

[0012] Preferably, the degree of freedom adjustment mechanism further includes at least two height adjustment mechanisms, one end of the height adjustment mechanism is connected to the ground, and the other end of the height adjustment mechanism is connected to the adjustment plate.

[0013] Preferably, the cube phantom is made of transparent material, the adapter plate is made of non-metallic material, and the target sphere is made of a material that can be imaged and reflect laser light in a track-mounted CT scan. This material arrangement enables the target sphere to form a very bright, high-density, high-CT value, and sharply defined dot on a track-mounted CT scan, making it extremely easy to identify and locate. The laser tracker can locate the target sphere through the cube phantom, preventing significant laser scattering from the phantom during laser positioning, which could interfere with the positioning signal.

[0014] Preferably, the bottom surface of the cube phantom is provided with a pin hole connected to the adapter plate. The pin hole positions the cube phantom to prevent the position of the cube phantom from changing during subsequent daily quality inspections and quality assurance processes.

[0015] The present invention solves the problem of lack of an intermediate interventional device to evaluate whether the deviation is from the laser light or the treatment couch when both the imaging coordinate system and the treatment coordinate system are offset, and has the following beneficial effects: an intermediate interventional device is provided to evaluate whether the deviation is from the laser light or the treatment couch; during subsequent quality inspection and quality assurance processes, the laser light and imaging system can be verified simultaneously by repositioning the intermediate interventional device; and the initial fixed position of the cube phantom serving as the interventional device can be freely adjusted. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are merely exemplary, and those skilled in the art can, without inventive effort, derive other implementation drawings based on the provided drawings.

[0017] Figure 1 A schematic diagram of the structure of a device for verifying the accuracy of laser lights and imaging systems.

[0018] Figure 2 A top view of a device for verifying the accuracy of laser lights and imaging systems.

[0019] Figure 3 Schematic diagram of the structure of the support adjustment device and the cube phantom.

[0020] Figure 4 This is a schematic structural diagram of the support and adjustment device in Example 1.

[0021] Figure 5 It is a structural diagram of the freedom adjustment mechanism.

[0022] Figure 6 This is the front view of the freedom adjustment mechanism.

[0023] Figure 7 It is a top view of the degree of freedom adjustment mechanism.

[0024] Figure 8 A schematic diagram of the structure of the adjustment mechanism for reducing the degree of freedom of the adjustment plate by one layer.

[0025] Figure 9 Front view of the adjustment mechanism for reducing the degree of freedom of the adjustment plate by one layer.

[0026] Figure 10 Top view of the adjustment mechanism for reducing the degree of freedom of one adjustment plate.

[0027] Figure 11 Schematic diagram of the structure of the adjustment mechanism to reduce the degree of freedom of the two-layer adjustment plate.

[0028] Figure 12 Front view of the adjustment mechanism for reducing the degrees of freedom of the two-layer adjustment plate.

[0029] Figure 13 Top view of the adjustment mechanism for reducing the degrees of freedom of the two-layer adjustment plate.

[0030] Figure 14 This is a schematic structural diagram of the support and adjustment device in Example 2.

[0031] Figure 15It is a structural diagram of the freedom adjustment mechanism in the second embodiment.

[0032] Figure 16 It is a partial enlarged view of the freedom adjustment mechanism in the second embodiment.

[0033] Figure 17 Schematic diagram of the structure of the cube phantom.

[0034] Figure 18 This is the front view of the cube phantom.

[0035] Figure 19 This is the left view of the cube phantom.

[0036] Figure 20 This is the right side view of the cube phantom.

[0037] Figure 21 This is a top view of the cube phantom.

[0038] Figure 22 This is the bottom view of the cube phantom.

[0039] Figure 23 This is the rear view of the cube phantom.

[0040] Legend: 1 Linear laser light; 2 Cross laser light; 3 Sliding rail CT; 4 Support adjustment device; 41 Ground embedded plate; 42 Height adjustment mechanism; 42a Sliding support; 42b Telescopic support; 42c Fixed hinge; 42d Sliding hinge; 42e Slide rail; 43 Degree of freedom adjustment mechanism; 43a Upper adjustment plate; 43b Lower adjustment plate; 43c Ejector mechanism; 43d Slide groove; 43e Cylindrical pin; 44 Adapter plate; 5 Cube phantom; 51 Front of phantom; 52 Top of phantom; 53 Left of phantom; 54 Bottom of phantom; 55 Right of phantom; 56 Back of phantom; 57 Center inlay hole; 58 First inlay hole; 59 Pin hole; 6 Cross scale line. DETAILED DESCRIPTION

[0041] 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 only part of the embodiments of the present invention, rather than all the embodiments.

[0042] Example 1 Combine Figure 1 and Figure 2As shown, a device for verifying the accuracy of laser lamps and imaging systems includes a sliding CT3, a verification device, and a laser lamp assembly. The laser lamp assembly includes at least two cross laser lamps 2 and at least one straight laser lamp 1. The laser lamp assembly is arranged on the side of a cube phantom 5. The laser paths of the cross laser lamps 2 and the straight laser lamp 1 pass through the centers of the corresponding surfaces of the cube phantom 5. The intersection of the laser paths of the cross laser lamps 2 and the straight laser lamp 1 coincides with the center point of the cube phantom 5. When the sliding CT is moved to the corresponding position, it also coincides with the image center. During the verification process of the radiotherapy equipment, target balls are placed in the designed inlay holes. Generally, at least one target ball is placed on each surface except the bottom surface of the cube phantom 5. By locating these target balls through CT images, it is possible to verify whether the mechanical isocenter, radiation isocenter, and image isocenter of the sliding CT3 are consistent.

[0043] The straight laser light 1 is opposite to the slide-type CT3, and the vertical laser line coincides with the center point of the image. The cross laser light 2 has two laser lines. The horizontal laser line needs to coincide with the horizontal line on the cube phantom, and the vertical line needs to be adjusted to coincide with the vertical laser line of the cube. Each cross scale line 6 has a mosaic hole of the same size, which can be used to place the laser tracker target ball and tungsten ball. The cube phantom 5 and the target ball are used as interventional devices to evaluate the treatment coordinate system and imaging coordinate system of the laser light and the slide-type CT3. The cube phantom 5 is engraved with a cross scale line 6, which can be used as a benchmark for laser light debugging. At the same time, subsequent daily quality inspections and quality assurance can be verified by placing the cube phantom and target ball in a fixed position and laser positioning and scanning to verify whether the laser light is offset and whether the treatment bed is offset, saving theoretical calculation and calibration time. The cube phantom can be inlaid with multiple target balls, and the positions between the target balls can be determined. There is no operational error in setting the target balls. During a CT scan and the operation of the laser tracker, multiple position data are obtained to verify the treatment coordinate system and imaging coordinate system of the laser lamp and the slide-type CT. It is also easier to clamp and place it stably in the working position of the slide-type CT for simultaneous verification of the laser lamp group and the imaging system.

[0044] Combine Figure 3 and Figure 4As shown, the verification device also includes a support and adjustment device 4. The top of the support and adjustment device 4 is provided with an adapter plate 44. One end of the adapter plate 44 is fixed to the cube phantom 5. The bottom of the support and adjustment device 4 is fixed to the ground. The extension direction of the adapter plate 44 is parallel to the movement direction of the slide-type CT3. The bottom of the slide-type CT3 has a guide rail, which can move along the line close to the cube phantom 5 and away from the cube phantom 5. The slide-type CT3 cannot move to the corresponding position to scan the cube phantom 5. The main function of the slide-type CT3 and the adapter plate 44 is to break through spatial limitations. When the patient is treated, the patient's tumor site is first moved to the imaging position. Due to space limitations, our imaging position is set at a position that can be reached by the bed board of the slide-type CT3. After scanning the lesion, it is moved to the treatment position at the beam outlet. After scanning, the slide-type CT3 moves to the initial position.

[0045] The support adjustment device 4 includes a degree-of-freedom adjustment mechanism 43 and a pre-embedded ground plate 41. The degree-of-freedom adjustment mechanism 43 is connected to an adapter plate 44. The degree-of-freedom adjustment mechanism 43 comprises at least two horizontally stacked layers of adjustment plates, which are parallel to the adapter plate 44. The top surface of the degree-of-freedom adjustment mechanism 43 is fixed to the adapter plate 44. The adjacent adjustment plates are divided into an upper adjustment plate 43a above and a lower adjustment plate 43b below. The connection between the upper adjustment plate 43a and the lower adjustment plate 43b allows for at least one adjustable degree of freedom. The pre-embedded ground plate 41 is cast in the concrete floor and is made of stainless steel. After casting, it serves as a reference and its spatial position does not change.

[0046] The cube phantom 5 is made of a transparent material, preferably acrylic, the adapter plate 44 is made of a non-metallic material, and the target ball is made of a material that can be imaged and reflect laser light in the slide-type CT3. The above-mentioned material setting enables the target ball to form a very bright small point in the slide-type CT3, that is, a high-density, high-CT value, and clear and sharp boundary, which is extremely easy to identify and locate. The laser tracker can locate the target ball through the cube phantom 5, avoiding the cube phantom 5 causing significant scattering and refraction of the laser during the laser positioning process, thereby interfering with the positioning signal. At the same time, it can avoid the interference of laser light scattered and refracted in the cube phantom due to the reflection of the target balls after multiple target balls are set in the cube phantom 5. The multiple target balls are clearly imaged in the slide-type CT3, avoiding the interference of multiple target balls at close distances and the cube phantom on CT imaging.

[0047] Combine Figures 5 to 13As shown, the lower adjustment plate 43b is equipped with a pin mechanism 43c that abuts the side of the upper adjustment plate 43a. At least two pin mechanisms 43c are located on each side of the upper adjustment plate 43a. By using the pin mechanisms 43c to abut different positions on the side of the upper adjustment plate 43a and varying the length of the pin mechanisms 43c abutment, the horizontal rotation angle of the upper adjustment plate 43a about the vertical axis and the relative position of the upper adjustment plate 43a can be adjusted, thereby achieving spatial movement of the cube phantom 5.

[0048] The upper adjustment plate 43a is provided with a waist-drum-shaped slot 43d, within which a cylindrical pin 43e is disposed, connecting the upper adjustment plate 43a and the lower adjustment plate 43b. The waist-drum-shaped slot 43d and the cylindrical pin 43e allow the upper adjustment plate 43a to rotate horizontally about a vertical axis and move horizontally relative to the lower adjustment plate 43b, while maintaining a secure connection between the upper and lower adjustment plates 43a, 43b.

[0049] The degree of freedom adjustment mechanism 43 further includes at least two height adjustment mechanisms 42 , one end of the height adjustment mechanism 42 is connected to the ground, and the other end of the height adjustment mechanism 42 is connected to the adjustment plate.

[0050] like Figures 17 to 23 As shown, the verification device includes a cube phantom 5 and a target ball. The top and side surfaces of the cube phantom 5 are provided with cross scale lines 6 and inlay holes. The cross scale lines 6 pass through the center of each surface and the midpoint of each edge line. The inlay holes include a central inlay hole 57 and a first inlay hole 58. The center of the cross scale line 6 is provided with a central inlay hole 57, and a first inlay hole 58 is provided on the cross scale line at an equal distance from the central inlay hole 57. The inlay holes cooperate with the target ball.

[0051] First inlay hole 58 is located near the edge of the face of the cube phantom 5, and is located 2 / 3 of the way from the center inlay hole 57 to the edge. First inlay hole 58 is also used to accommodate the laser tracker target ball and tungsten sphere. The laser tracker locates the point on the cube phantom 5 corresponding to the laser tracker target ball. Since the positions of first inlay hole 58 and the center point of the cube phantom 5 are fixed, the difference in spatial position between the center point of the cube phantom 5 and the set image point can be determined. By knowing these differences, the support adjustment device 4 can be adjusted so that the center of the cube phantom 5 coincides with the set image center. After adjustment, the slide CT can be operated to move a fixed distance to scan the cube phantom. The difference between the image center at this position and the set image center can be determined through tungsten sphere imaging. This difference can be achieved by adjusting the CT for the first time. The center of the cube phantom 5 is also the image center that needs to be set for the patient's tumor.

[0052] The inlay holes also include secondary inlay holes, located in quadrants on the top and side surfaces of the cube phantom 5. The quadrants are centered on the central inlay hole 57 and divided by a crosshair mark 6. The crosshair mark 6 has the X-axis as its horizontal axis and the Y-axis as its vertical axis. Starting from the upper right corner, the quadrant is divided counterclockwise into four quadrants. The first quadrant is located in the upper right corner; the second quadrant is located in the upper left corner; the third quadrant is located in the lower left corner; and the fourth quadrant is located in the lower right corner.

[0053] like Figure 18 As shown, a second inlay hole is provided in the first quadrant of the front face 51 of the cube phantom 5 , and the second inlay hole is located at the intersection of the first inlay hole 58 and the extension line perpendicular to the cross scale line 6 .

[0054] like Figure 19 As shown, a second inlay hole is provided in the third quadrant of the phantom top surface 52 of the cube phantom 5 , and the second inlay hole is located at the intersection of the first inlay hole 58 and the extension line perpendicular to the cross scale line 6 .

[0055] like Figure 20 As shown, a second inlay hole is provided in the second quadrant of the left side 53 of the cube phantom 5 , and the second inlay hole is located at the intersection of the extension line from the central inlay hole 57 to the side line 5 / 6 perpendicular to the cross scale line 6 .

[0056] like Figure 21 As shown, the bottom surface 54 of the cube phantom 5 is provided with a pin hole 59 connected to the adapter plate 44. The pin hole 59 positions the cube phantom 5 to prevent the position of the cube phantom 5 from changing during subsequent daily quality inspections and quality assurance processes.

[0057] like Figure 22 As shown, the second quadrant and the third quadrant of the right side 55 of the cube phantom 5 are provided with second inlay holes.

[0058] like Figure 23 As shown, the fourth quadrant of the back 56 of the cube phantom 5 is provided with a second inlay hole.

[0059] Example 2 like Figures 14 to 16As shown, the difference between this embodiment and the first embodiment lies in the height adjustment mechanism 42. The height adjustment mechanism 42 in this embodiment includes a telescopic support member 42b, a sliding support member 42a hinged to the telescopic hinge, and a fixed hinge member 42c. One end of each of the telescopic support member 42b and the sliding support member 42a is hinged to the adjustment plate via a fixed hinge member 42c. The other end of the telescopic support member 42b is fixed relative to the ground. The telescopic support member 42b adopts a nested sleeve structure. The length of the telescopic support member 42b can be adjusted by adjusting the fixing points between the sleeves. The other end of the sliding support member 42a is a sliding end that can move relative to the ground. The height adjustment mechanism 42 also includes a support plate that is parallel to the adjustment plate and is provided with a slide rail and a corresponding sliding hinge member 42d. The sliding end of the sliding support member 42a is connected to the slide rail via a sliding hinge member 42d. The sliding hinge member 42d has a fixing hole. The slide rail has a plurality of positioning holes on its surface that match the fixing holes. The positioning holes can be fixed to the fixing holes via pins.

[0060] Through this arrangement, the length of telescopic support member 42b is adjusted, thereby adjusting the tilt angle of degree-of-freedom adjustment mechanism 43. Adjusting the fixed position of the sliding end of sliding support member 42a adjusts the overall height of support adjustment device 4, thereby achieving spatial posture adjustment of cube phantom 5. Both telescopic support member 42b and sliding support member 42a are mechanically secured, preventing electronic component failure caused by radiation during long-term use in the proton and heavy ion equipment room.

[0061] Proton and heavy ion therapy is a precision treatment, requiring precise positioning of the points. The two most critical points are the treatment site (isocenter) and the CT imaging site. During precision treatment, the imaging site and the isocenter coincide.

[0062] The specific process of calibrating the laser light group and the slide-type CT3 is as follows: 1. There is a set constant relationship between the imaging site and the isocenter of the sliding rail CT3. In the construction of the entire proton and heavy ion machine room, it is necessary to preset a theoretical coordinate system, and set the isocenter and the imaging site through the theoretical coordinate system. At this time, combined with the laser tracker, the target ball is placed in the central inlay hole 57 of the five faces of the cube phantom 5. The coordinate value of the center of the cube phantom can be read out by conversion, and the degree of freedom adjustment mechanism 43 on the adjustment device is adjusted to move the center of the cube phantom to the set isocenter position. When the position of the isocenter is found, the target ball is removed and the laser light is adjusted so that the laser line coincides with the cross line of the cube phantom in the horizontal and vertical directions. Then we have installed and debugged the laser light.

[0063] 2. Install and move the CT3 slide so that it faces the cube phantom 5. Place target balls in non-coplanar holes in the phantom 5. When the CT3 slide scans the cube phantom 5, the target balls within the phantom 5 allow for quick alignment of the CT3 slide's image center with the phantom's center. After the initial scan, adjust the CT3 slide's position to ensure that the image center aligns with the pre-set spatial coordinates.

[0064] 3. After the verification device is installed and debugged for the first time, lock the corresponding ejector mechanism 43c, return the slide rail CT3 to the position when it is not in operation, and remove the verification device.

[0065] 4. After a while, we need to verify whether the laser light has shifted. Simply place the cube phantom 5 on the embedded floor plate 41 and tighten the screws. We can visually check whether the laser line coincides with the crosshairs 6 on the cube phantom 5. If there is any deviation, we can adjust the laser light assembly to the desired position. Similarly, scan the cube phantom 5 with a slide-type CT3 to determine whether the image center of the slide-type CT3 has shifted. If so, the slide-type CT3 can be adjusted.

[0066] The present invention solves the problem of lack of an intermediate interventional device to evaluate whether the deviation is from the laser light or the treatment couch when both the imaging coordinate system and the treatment coordinate system are offset, and has the following beneficial effects: an intermediate interventional device is provided to evaluate whether the deviation is from the laser light or the treatment couch; during subsequent quality inspection and quality assurance processes, the laser light and imaging system can be verified simultaneously by repositioning the intermediate interventional device; and the initial fixed position of the cube phantom serving as the interventional device can be freely adjusted.

[0067] The above embodiments and / or implementation methods are only used to illustrate the preferred embodiments and / or implementation methods for realizing the technology of the present invention, and are not intended to limit the implementation methods of the technology of the present invention in any form. Any person skilled in the art may make slight changes to other equivalent embodiments without departing from the scope of the technical means disclosed in the content of the present invention, but they should still be regarded as technologies or embodiments that are essentially the same as the present invention.

Claims

1. A device for verifying the accuracy of a laser light and an imaging system, comprising a slide-type CT (3), a verification device, and a laser light assembly, wherein the laser light assembly comprises at least two cross laser lights (2) and at least one line laser light (1), characterized in that: The verification device comprises a cube phantom (5) and a target ball. The top surface and side surfaces of the cube phantom (5) are provided with cross scale lines (6) and inlay holes. The cross scale lines (6) pass through the center of each surface and the midpoint of each edge line. The inlay holes include a central inlay hole (57) and a first inlay hole (58). The center of the cross scale line (6) is provided with a central inlay hole (57). The first inlay hole (58) is provided on the cross scale line at an equal distance from the central inlay hole (57). The inlay holes cooperate with the target ball.

2. The device for verifying the accuracy of a laser light and an imaging system according to claim 1, characterized in that: The first inlay hole (58) is close to the edge of the face of the cube phantom (5), and the first inlay hole (58) is located at 2 / 3 of the distance from the central inlay hole (57) to the edge.

3. The device for verifying the accuracy of a laser light and an imaging system according to claim 1, characterized in that: The laser light group is arranged on the side of the cube phantom (5), the laser paths of the cross laser light (2) and the line laser light (1) pass through the center of the corresponding surface of the cube phantom (5), and the intersection of the laser paths of the cross laser light (2) and the line laser light (1) coincides with the center point of the cube phantom (5).

4. The device for verifying the accuracy of a laser light and an imaging system according to claim 1, characterized in that: The verification device further comprises a support adjustment device (4), wherein a transfer plate (44) is provided on the top of the support adjustment device (4), one end of the transfer plate (44) is fixed to the cube phantom (5), the bottom of the support adjustment device (4) is fixed to the ground, and the extension direction of the transfer plate (44) is parallel to the moving direction of the slide-type CT (3).

5. The device for verifying the accuracy of a laser light and an imaging system according to claim 4, characterized in that: The support adjustment device (4) includes a degree of freedom adjustment mechanism (43), the degree of freedom adjustment mechanism (43) is connected to the adapter plate (44), the degree of freedom adjustment mechanism (43) includes at least two layers of adjustment plates stacked horizontally, the adjustment plates are parallel to the adapter plate (44), the top surface of the degree of freedom adjustment mechanism (43) is fixed to the adapter plate (44), the adjacent adjustment plates are divided into an upper adjustment plate (43a) and a lower adjustment plate (43b), and the connection between the upper adjustment plate (43a) and the lower adjustment plate (43b) has at least one adjustable degree of freedom.

6. The device for verifying the accuracy of a laser light and an imaging system according to claim 5, characterized in that: The lower adjustment plate (43b) is provided with a ejector mechanism (43c) abutting against the side surface of the upper adjustment plate (43a), and each side surface of the upper adjustment plate (43a) is provided with at least two ejector mechanisms (43c).

7. The device for verifying the accuracy of a laser light and an imaging system according to claim 5, characterized in that: The upper adjustment plate (43a) is provided with a waist-drum-shaped chute (43d), and a cylindrical pin (43e) is provided in the waist-drum-shaped chute (43d) to connect the upper adjustment plate (43a) and the lower adjustment plate (43b).

8. The device for verifying the accuracy of a laser light and an imaging system according to claim 5, characterized in that: The degree of freedom adjustment mechanism (43) further comprises at least two height adjustment mechanisms (42), one end of each height adjustment mechanism (42) is connected to the ground, and the other end of each height adjustment mechanism (42) is connected to the adjustment plate.

9. The device for verifying the accuracy of a laser light and an imaging system according to claim 5, characterized in that: The cube phantom (5) is made of a transparent material, the adapter plate (44) is made of a non-metallic material, and the target sphere is made of a material capable of imaging and reflecting laser light in a slide-type CT (3).

10. The device for verifying the accuracy of laser light and imaging system according to claim 5, characterized in that: The bottom surface of the cube phantom (5) is provided with a pin hole (59) connected to the adapter plate (44).

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