Medical linear accelerator six-dimensional bed quality control auxiliary device

Abstract

The utility model discloses a medical linear accelerator six-dimensional bed quality control auxiliary device technology, and relates to the radiotherapy quality control auxiliary device technology field, the medical linear accelerator six-dimensional bed quality control auxiliary device technology field comprises a die body main body unit and a graduated scale, cross indication lines are carved on the top surface of the die body main body unit and the center of each surface around the die body main body unit, and the graduated scale is arranged on the die body main body unit. Eight cylindrical protruding bolts are fixedly connected to the periphery of the upper edge of the top face of the die body main body unit, four cylindrical protruding bolts are fixedly connected to all the faces of the periphery of the die body main body unit, and high-precision digital display gradienter displays are fixedly connected to all the faces of the periphery of the die body main body unit. Height-adjustable anti-skid supporting feet are fixedly installed at the four corners of the bottom face of the die body main body unit, three concave cylindrical holes are formed in the back face of the graduated scale, and the die body main body unit comprises the A direction, the B direction, the G direction and the T direction. According to the utility model, the six degrees of freedom of the six-dimensional bed of the medical linear accelerator can be measured independently, and the correction capability of the six-dimensional bed can be detected under the guidance of images.

Description

Technical Field

[0001] The utility model relates to the technical field of radiotherapy quality control auxiliary devices, in particular to a quality control auxiliary device technology for a medical linear accelerator six-dimensional bed. Background Art

[0002] Radiotherapy is one of the main treatments for malignant tumors. Today, we have entered the era of precision radiotherapy, especially with the widespread application of technologies such as IMRT, VMAT, SRS and SBRT, and ensuring the accuracy of radiotherapy position has become the key to treatment. Precision radiotherapy under image guidance requires online error correction of the patient's position in multiple directions or angles. Compared with traditional treatment beds, the six-dimensional treatment bed has linear motion in the three directions of X, Y, and Z and rotational motion around the three directions of X, Y, and Z, so that the patient's position can be adjusted from 6 degrees of freedom, thereby improving the accuracy of correcting positioning errors. Therefore, the six-dimensional bed is now more widely used.

[0003] The existing technology has the following problems:

[0004] In the image-guided therapy mode, the online correction of positioning errors of the six-dimensional radiotherapy bed is the last step before the patient receives treatment. The accuracy and repeatability of various parameters of the six-dimensional bed will directly affect the execution accuracy of the treatment plan. As the most important supporting component in radiotherapy, factors such as movement wear and aging, gravity factors and fault maintenance will cause the mechanical accuracy of the treatment bed to change or the movement to be distorted, which will have an adverse effect on radiotherapy and even lead to treatment failure. Therefore, it is necessary to conduct regular quality control and quality assurance. Utility Model Content

[0005] The utility model provides a quality control auxiliary device technology for a six-dimensional bed of a medical linear accelerator to solve the problems raised in the above-mentioned background technology.

[0006] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0007] A medical linear accelerator six-dimensional bed quality control auxiliary device technology, including a phantom body unit and a scale, the top surface of the phantom body unit and the center of each of the surrounding surfaces are engraved with cross indicator lines, eight cylindrical protruding pins are fixedly connected around the upper edge of the top surface of the phantom body unit, four cylindrical protruding pins are fixedly connected to each of the surrounding surfaces of the phantom body unit, a high-precision digital level display is fixedly connected to each of the surrounding surfaces of the phantom body unit, adjustable height non-slip feet are fixedly installed at the four corners of the bottom surface of the phantom body unit, three concave cylindrical holes are opened on the back of the scale, and the phantom body unit includes A direction, B direction, G direction, and T direction.

[0008] A further improvement of the technical solution of the utility model is that the cylindrical protruding plug is made of high-density material and can be used as a marking point during image guidance.

[0009] A further improvement of the technical solution of the utility model is that the scale ruler is 30 cm long and has a certain thickness, with the center being at 0 scale and 15 cm marked on both sides.

[0010] A further improvement of the technical solution of the utility model is that the inwardly concave cylindrical hole can be fitted and fixed with the cylindrical protruding latch on the main unit of the mold body.

[0011] A further improvement of the technical solution of the utility model is that the A direction faces the left hand side of the frame.

[0012] A further improvement of the technical solution of the utility model is that the B direction faces the right-hand side direction of the frame.

[0013] A further improvement of the technical solution of the utility model is that: the G direction points to the direction of the accelerator head.

[0014] A further improvement of the technical solution of the utility model is that the T direction points to the six-dimensional bed end direction.

[0015] Due to the adoption of the above technical solution, the utility model has achieved the following technical progress compared with the prior art:

[0016] 1. The utility model provides a quality control auxiliary device technology for a medical linear accelerator six-dimensional bed. Through the mutual cooperation among the phantom main unit, the scale, the concave cylindrical hole, the cylindrical protruding pin, the high-precision digital level display, and the adjustable height non-slip feet, the six degrees of freedom of the medical linear accelerator six-dimensional bed can be independently measured, and the six-dimensional bed correction capability can be detected under image guidance. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the six-dimensional bed coordinate system and movement direction of the utility model;

[0018] Figure 2 This is a schematic diagram of the main unit of the six-dimensional bed phantom of the utility model;

[0019] Figure 3 The three-view drawing of the main body of the six-dimensional bed phantom of the utility model;

[0020] Figure 4 It is a schematic diagram of the six-dimensional bed scale of the utility model.

[0021] In the figure: 1. Main unit of the phantom; 2. Scale; 21. Inwardly concave cylindrical hole; 3. Cylindrical raised pin; 4. High-precision digital level display; 5. Adjustable height non-slip feet. DETAILED DESCRIPTION

[0022] In order to make the technical means, creative features, objectives and effects of the present invention easy to understand, the present invention is further described below in conjunction with specific implementation methods:

[0023] like Figure 1-4 As shown, the utility model provides a quality control auxiliary device technology for a medical linear accelerator six-dimensional bed, including a phantom body main unit 1 and a scale 2, the top surface of the phantom body main unit 1 and the center of each of the surrounding surfaces are engraved with cross indicator lines, eight cylindrical protruding pins 3 are fixedly connected to the upper edge of the top surface of the phantom body main unit 1, four cylindrical protruding pins 3 are fixedly connected to each of the surrounding surfaces of the phantom body main unit 1, a high-precision digital level display 4 is fixedly connected to each of the surrounding surfaces of the phantom body main unit 1, and adjustable height non-slip feet 5 are fixedly installed at the four corners of the bottom surface of the phantom body main unit 1, and engraved Three concave cylindrical holes 21 are provided on the back of the scale 2. The main unit 1 of the phantom includes directions A, B, G and T. The cylindrical protruding pins 3 are made of high-density material and can be used as marking points for image guidance. The scale 2 is 30 cm long and has a certain thickness. The center is at the 0 scale, and 15 cm is marked on both sides. The concave cylindrical holes 21 can be fitted and fixed with the cylindrical protruding pins 3 on the main unit 1 of the phantom. The A direction faces the left side of the frame, the B direction faces the right side of the frame, the G direction points to the accelerator head direction, and the T direction points to the end of the six-dimensional bed.

[0024] Place a 70kg load evenly on the six-dimensional bed surface, place it in the conventional treatment position, and then return the angle of the six-dimensional bed to zero;

[0025] Place the phantom main unit 1 on the six-dimensional bed in the marked direction, align the crosshairs on each surface of the phantom main unit 1 with the laser of the medical linear accelerator and move them to the isocenter, and adjust the height-adjustable non-slip feet 5 so that the high-precision digital level display 4 on each surface around the phantom main unit 1 displays values ​​of 0° horizontal state;

[0026] The scale 2 is fitted and fixed with the two cylindrical protruding pins 3 on the central axis of the top surface AB direction of the phantom main unit 1. At this time, the indication position of the medical linear accelerator laser light is just aligned with the 0 scale on the scale 2. The initial value displayed in the X-axis direction on the accelerator system is recorded, and the six-dimensional bed is moved along the X-axis direction to the target distance. The value displayed in the X-axis direction on the accelerator is recorded again, and then the result obtained by subtracting the displayed value from the initial value is compared with the target distance, that is, the movement accuracy in the X-axis indication direction is obtained. Multiple different target distances can be taken, and the movement accuracy in the X-axis indication direction can be calculated multiple times;

[0027] Align the crosshairs on each surface of the phantom main unit 1 with the medical linear accelerator laser and move them to the isocenter again;

[0028] Fit and fix the ruler 2 with the two cylindrical raised pins 3 on the central axis of the top surface GT direction of the phantom main unit 1. At this time, the indication position of the medical linear accelerator laser light is just aligned with the 0 scale on the ruler 2. Record the initial value displayed in the Y-axis direction of the accelerator, move the six-dimensional bed along the Y-axis direction to the target distance, record the value displayed in the Y-axis direction of the accelerator system again, and then subtract the displayed value from the initial value and compare it with the target distance to obtain the movement accuracy in the Y-axis indication direction. Multiple different target distances can be taken and the movement accuracy in the Y-axis indication direction can be calculated multiple times.

[0029] Align the crosshairs on each surface of the phantom main unit 1 with the medical linear accelerator laser and move them to the isocenter again;

[0030] The scale 2 is fitted and fixed with the two cylindrical raised pins 3 on the vertical central axis of the A surface or B surface of the phantom main unit 1. At this time, the indication position of the medical linear accelerator laser light is just aligned with the 0 scale on the scale 2. The initial value displayed in the Z-axis direction on the accelerator system is recorded, and the six-dimensional bed is moved along the Z-axis direction to the target distance. The value displayed in the Z-axis direction on the accelerator is recorded again, and then the result obtained by subtracting the displayed value from the initial value is compared with the target distance to obtain the movement accuracy in the Z-axis indication direction. Multiple different target distances can be taken and the movement accuracy in the Z-axis indication direction can be calculated multiple times.

[0031] Align the crosshairs on each surface of the phantom main unit 1 with the medical linear accelerator laser again and place them at the isocenter; check whether the values ​​displayed by the high-precision digital level display 4 on each surface around the phantom main unit 1 are all in a horizontal state of 0°; if not, adjust the height-adjustable non-slip feet 5 to make them in a horizontal state;

[0032] Manually adjust the rotation angle (pitch angle) of the six-dimensional bed in the X-axis indication direction. After the A-side or B-side level reaches the target angle, check the pitch angle value displayed on the accelerator system. Compare the two angle values ​​to get the rotation angle accuracy in the X-axis indication direction.

[0033] The six-dimensional angle is reset to zero again, the crosshairs on each surface of the phantom main unit 1 are aligned with the medical linear accelerator laser and moved to the isocenter, and the height-adjustable non-slip feet 5 are adjusted so that the high-precision digital level display 4 on each surface around the phantom main unit 1 displays values ​​of 0° horizontal state;

[0034] Manually adjust the rotation angle in the Y-axis direction of the six-dimensional bed (the left and right inclination angle of the six-dimensional bed). After the A-side or B-side level meter reaches the target angle, check the pitch angle value displayed on the accelerator system. Compare the two angle values ​​to get the rotation angle accuracy in the Y-axis direction.

[0035] The angle of the six-dimensional bed is reset to zero again, the crosshairs on each surface of the phantom main unit 1 are aligned with the laser of the medical linear accelerator and moved to the isocenter, and the height-adjustable non-slip feet 5 are adjusted so that the high-precision digital level display 4 on each surface around the phantom main unit 1 displays values ​​of 0° horizontal state;

[0036] Manually adjust the rotation angle in the Z-axis indication direction of the six-dimensional bed, that is, the revolution angle of the six-dimensional bed. After checking that the angle indication angle on the phantom main unit 1 reaches the target angle, check the revolution angle value displayed on the accelerator system. Compare the two angle values ​​to get the rotation angle accuracy in the Z-axis indication direction.

[0037] Through the above process, the main technical indicators of quality control of the six-dimensional bed in six degrees of freedom can be obtained;

[0038] like Figure 1-4 As shown, the utility model provides a quality control auxiliary device technology for a six-dimensional bed of a medical linear accelerator, which scans the phantom main unit 1 on a CT simulator to obtain an image, transmits the image of the phantom main unit 1 to the accelerator imaging system, and obtains an image-guided reference image;

[0039] Place a 70kg load evenly on the six-dimensional bed surface, place it in the conventional treatment position, and then return the six-dimensional bed to zero; then place the phantom main unit 1 on the six-dimensional bed in the marked direction, align the crosshairs on each surface of the phantom main unit 1 with the medical linear accelerator laser and move it to the isocenter, and adjust the height-adjustable non-slip feet 5 so that the high-precision digital level display 4 on each surface around the phantom main unit 1 displays values ​​of 0° horizontal state;

[0040] After the phantom main unit 1 is positioned properly, a medical linear accelerator image guidance system is used to obtain a positioning image. The positioning image can be registered with the reference image by marking points with cylindrical protruding pins 3 on the surface of the phantom main unit 1 to eliminate positioning errors during positioning.

[0041] After entering the machine room, the six-dimensional bed is moved and rotated in six degrees of freedom by the ruler 2 and the level to the known target parameters, and the positioning image is obtained again through the medical linear accelerator image guidance system. The positioning image after movement and rotation is again aligned with the reference image, and the points are marked again by the cylindrical protruding pins 3 on the surface of the phantom main unit 1. After alignment, the six-degree-of-freedom correction values ​​of the six-dimensional bed can be obtained. By applying the correction values ​​and comparing with the known target parameters of movement and rotation, the correction capability of the six-dimensional bed can be obtained.

[0042] The above generally describes the present invention in detail, but it is obvious to a person skilled in the art that some modifications or improvements can be made to the present invention. Therefore, modifications or improvements that do not deviate from the spirit of the present invention are within the scope of protection of the present invention.

Claims

1. A medical linear accelerator six-dimensional bed quality control auxiliary device, characterized by: The invention comprises a model body unit (1) and a scale (2), wherein the top surface and the centers of the surrounding surfaces of the model body unit (1) are engraved with cross indicator lines, eight cylindrical protruding plugs (3) are fixedly connected around the upper edge of the top surface of the model body unit (1), four cylindrical protruding plugs (3) are fixedly connected to the surrounding surfaces of the model body unit (1), a high-precision digital level display (4) is fixedly connected to the surrounding surfaces of the model body unit (1), and height-adjustable non-slip feet (5) are fixedly installed at the four corners of the bottom surface of the model body unit (1), and three concave cylindrical holes (21) are opened on the back of the scale (2), and the model body unit (1) comprises an A direction, a B direction, a G direction, and a T direction.

2. A medical linear accelerator six-dimensional bed quality control auxiliary device according to claim 1, characterized in that: The cylindrical protruding plug pin (3) is made of high-density material and can be used as a marking point during image guidance.

3. The medical linear accelerator six-dimensional bed quality control auxiliary device according to claim 1, characterized in that: The scale ruler (2) is 30 cm long and has a certain thickness, with the center at 0 scale and 15 cm marks on both sides.

4. The medical linear accelerator six-dimensional bed quality control auxiliary device according to claim 1, characterized in that: The inwardly concave cylindrical hole (21) can be fitted and fixed with the cylindrical protruding latch (3) on the main mold unit (1).

5. The medical linear accelerator six-dimensional bed quality control auxiliary device according to claim 1, characterized in that: The A direction faces the left hand side of the rack.

6. The medical linear accelerator six-dimensional bed quality control auxiliary device according to claim 1, characterized in that: The B direction faces the right hand side of the rack.

7. The medical linear accelerator six-dimensional bed quality control auxiliary device according to claim 1, characterized in that: The G direction points to the direction of the accelerator head.

8. The medical linear accelerator six-dimensional bed quality control auxiliary device according to claim 1, characterized in that: The T direction points to the six-dimensional bed end direction.

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