Isocenter measuring tool

Abstract

The utility model provides an isocenter measuring tool. The isocenter measuring tool comprises a connecting device, a three-axis sliding table, a connecting rod, a standard ball, a mounting seat and a dial indicator, a connecting piece is arranged at the top of the connecting device and is used for being connected with a radiotherapy head of radiology equipment; the upper end of the three-axis sliding table is connected with the bottom of the connecting device; the first end of the connecting rod is fixedly connected with the lower end of the three-axis sliding table, and the second end of the connecting rod is fixedly connected with the standard ball; the mounting seat is arranged on a treatment bed of radiology equipment; the mounting seat is provided with three reference surfaces which are vertical to one another; a dial indicator is arranged on each reference surface; the measuring directions of the three dial indicators are perpendicular to each other and point to the same point. According to the invention, the isocenter of the radiology equipment can be measured.

Description

Technical Field

[0001] The present application relates to the technical field of radiotherapy, and in particular to an isocenter measurement tool. Background Art

[0002] Radiotherapy equipment is a medical device that uses radiation to treat tumors. The radiotherapy equipment is equipped with a treatment head, and the treatment head is generally equipped with an accelerator tube. The accelerator tube can rotate and emit radiation for radiotherapy, and the patient's tumor site needs to be placed at the isocenter position of the radiotherapy equipment.

[0003] In medical radiology terminology, the definition of isocenter is: in radiological equipment, the reference axes of various movements move around a common center point, and the radiation axis passes through the smallest sphere centered on this point. This point is the isocenter (the isocenter includes the mechanical isocenter and the radiation isocenter. The isocenter in this application mainly refers to the mechanical isocenter).

[0004] Modern radiotherapy technology has developed into the era of "precision radiotherapy" with conformal and intensity-modulated radiation therapy, which requires that every step in the treatment process must be performed under strict standards, and the inspection and testing of the equipment must be foolproof. Among them, the accuracy of the isocenter position is the core of all problems. Therefore, it is very important to determine the accuracy of the isocenter position, which can reflect the mechanical motion accuracy of the radiotherapy equipment and is also the basic starting point for determining the radiation field and its characteristics. Whether the isocenter position is accurate directly affects the position of the target area and organs at risk determined in the treatment plan. The deviation of its position will lead to serious errors in the dose distribution in the patient's body, which may not only fail to treat the patient, but also cause damage to normal organs. Utility Model Content

[0005] In view of this, the utility model provides an isocenter measurement tool, so as to realize the measurement of the isocenter of radiological equipment.

[0006] The technical solution of the utility model is specifically achieved as follows:

[0007] An isocenter measurement tool, the isocenter measurement tool comprising: a connecting device, a three-axis slide, a connecting rod, a standard ball, a mounting seat and a dial indicator;

[0008] A connecting piece is provided on the top of the connecting device for connecting to a radiotherapy head of a radiological device;

[0009] The upper end of the three-axis slide is connected to the bottom of the connecting device;

[0010] The first end of the connecting rod is fixedly connected to the lower end of the three-axis slide, and the second end of the connecting rod is fixedly connected to the standard ball;

[0011] The mounting seat is arranged on a treatment bed of radiological equipment; three mutually perpendicular reference surfaces are arranged on the mounting seat; a dial indicator is arranged on each reference surface; and the measuring directions of the three dial indicators are mutually perpendicular and point to the same point.

[0012] Preferably, the connecting member of the connecting device comprises: a fixing block;

[0013] Clamps are arranged at both ends of the fixing block for clamping a mounting plate arranged on the radiotherapy head.

[0014] Preferably, the clamp comprises: a base, a clamping plate and a fastening bolt;

[0015] The base is arranged on the top of the fixed block; a sliding groove is arranged in the middle of the base; a screw hole is arranged in the sliding groove;

[0016] The clamping plate is slidably arranged in the sliding groove of the base, and a through groove is arranged in the middle of the clamping plate;

[0017] The fastening bolt is arranged in the through slot of the clamping plate and is used to fix the clamping plate in the sliding slot.

[0018] Preferably, the upper end of the three-axis slide is connected to the bottom of the connecting device through a connecting plate;

[0019] The connecting plate is provided with a positioning pin hole for accurate positioning with the treatment head.

[0020] Preferably, the connecting rod comprises: a first connecting rod and a second connecting rod;

[0021] The upper end of the first connecting rod is fixedly connected to the lower end of the three-axis slide, and the lower end of the first connecting rod is rotatably connected to the upper end of the second connecting rod;

[0022] The lower end of the second connecting rod is fixedly connected to the standard ball.

[0023] Preferably, the first connecting rod and the second connecting rod are in an oblique L-shape.

[0024] Preferably, the dial indicator is fixed to the reference surface of the mounting seat by a locking member and a nut.

[0025] Preferably, the probe of the dial indicator is cylindrical or disc-shaped.

[0026] Preferably, the dial indicator is an electronic indicator or a manual indicator.

[0027] Preferably, the measuring direction of the first dial indicator is parallel to the direction of the rotation axis of the frame;

[0028] The measuring direction of the second dial indicator is parallel to the rotation axis of the treatment head;

[0029] The measuring direction of the third dial indicator is perpendicular to the measuring directions of the first dial indicator and the second dial indicator.

[0030] As can be seen from the above, in the isocenter measurement tool of the present invention, since a connecting device, a three-axis slide, a connecting rod, a standard ball, a mounting seat and a dial indicator are provided in the isocenter measurement tool, it is possible to connect to the radiotherapy head of the radiological equipment through the connecting device, and set the mounting seat on the treatment bed, and then adjust the position of the standard ball through the three-axis slide and the connecting rod, and obtain the measurement data at each moment in real time through the dial indicator, so that the isocenter of the radiological equipment can be measured through the above-mentioned isocenter measurement tool. Moreover, further, the error of the isocenter of the radiological equipment can also be measured through the isocenter measurement tool in the present application; or, the marking of the isocenter can also be completed through the isocenter measurement tool in the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a structural schematic diagram of the isocenter measurement tooling in an embodiment of the utility model.

[0032] Figure 2 It is a schematic diagram of the installation of the isocenter measurement tool in the embodiment of the utility model.

[0033] Figure 3 Schematic diagram of a connecting piece in an embodiment of the present utility model.

[0034] Figure 4 It is a schematic diagram of the isocenter measurement tool in the embodiment of the utility model. DETAILED DESCRIPTION

[0035] In order to make the technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0036] Figure 1 Schematic diagram of the structure of the isocenter measurement tool in the embodiment of the utility model. Figure 2 FIG. 1 is a schematic diagram of the installation of the isocenter measurement tool in the embodiment of the utility model. Figure 1 and Figure 2 As shown, the isocenter measurement tool in the embodiment of the utility model includes: a connecting device 11, a three-axis slide 12, a connecting rod 13, a standard ball 14, a mounting seat 15 and a dial indicator 16;

[0037] The top of the connecting device 11 is provided with a connecting piece 110 for connecting with the radiotherapy head 10 of the radiology equipment;

[0038] The upper end of the three-axis slide 12 is connected to the bottom of the connecting device 11;

[0039] The first end of the connecting rod 13 is fixedly connected to the lower end of the three-axis slide 12, and the second end of the connecting rod 13 is fixedly connected to the standard ball 14;

[0040] The mounting base 15 is arranged on a treatment bed 20 of the radiological equipment; three mutually perpendicular reference planes are arranged on the mounting base 15; a dial indicator 16 is arranged on each reference plane; the measuring directions of the three dial indicators 16 (for example, the emission directions of the rays emitted by the probe of the dial indicator) are mutually perpendicular and point to the same point.

[0041] In the technical solution of the present application, the above-mentioned isocenter measurement tooling can be connected to the radiotherapy head of the radiological equipment through a connecting device, and the three-axis slide arranged at the bottom of the connecting device can move in three mutually perpendicular directions (for example, the X-axis, Y-axis and Z-axis directions of the spatial coordinate system), thereby driving the connecting rod connected to the lower end of the three-axis slide to move accordingly, thereby driving the standard ball connected to the second end of the connecting rod to move accordingly; and on the treatment bed of the radiological equipment, a mounting seat is provided, on which three dial indicators with three measuring directions perpendicular to each other and pointing to the same point are provided.

[0042] Therefore, before using the above-mentioned isocenter measurement fixture to measure the isocenter, the gantry and the treatment head can be placed in the initial position (for example, the gantry and the treatment head are placed at the 0° position), and then the three-axis slide table can be adjusted so that the center of the standard ball is located near the isocenter. Subsequently, the treatment bed can be moved, and each dial indicator can be adjusted so that the probe of each dial indicator is attached to the spherical surface of the standard ball, completing the preparation work before measurement, such as Figure 4 shown.

[0043] When measuring the isocenter, the treatment head can be rotated at a preset speed within the stroke, and the measurement data (e.g., readings) of the three dial indicators at at least three moments (e.g., the moments when the treatment head is respectively at 0°, -90°, and 90°) can be recorded respectively; then the three-axis slide table is adjusted according to the measurement data so that the error between the measurement data of the three dial indicators at each moment is less than or equal to a preset first error threshold (e.g., the first error threshold can be 0.1 mm, or other suitable values). At this point, it can be confirmed that the center of the standard ball is located at the rotation center of the treatment head.

[0044] For example, as an example, in a specific embodiment of the present application, the measuring direction of the first dial indicator can be parallel to the direction of the rotation axis of the frame, the measuring direction of the second dial indicator can be parallel to the direction of the rotation axis of the treatment head, and the measuring direction of the third dial indicator can be perpendicular to the measuring directions of the first dial indicator and the second dial indicator, respectively.

[0045] If the trajectory of the treatment head during rotation is a standard circle, the error between the measurement data of the first dial gauge and the third dial gauge at each moment should be very small (this error is more affected by the accuracy of the dial gauge and the accuracy of the standard ball), but considering the bearing circle runout and installation error, when the above error is less than or equal to the preset first error threshold (for example, 0.1 mm), it can be considered that the center of the standard ball is already located at the rotation center of the treatment head. In addition, considering the bearing end runout and installation error, there should also be a certain error between the measurement data of the second dial gauge at each moment, but the error should be small, possibly not exceeding 0.05 mm, and the smaller the above error, the better.

[0046] After confirming that the center of the standard ball is located at the rotation center of the treatment head, the treatment head can be fixed at the initial position (for example, the treatment head is locked at the 0° position), and then the frame is rotated at a preset speed within the stroke, and the measurement data (for example, readings) of the three dial indicators at at least four moments (for example, the moments when the frame is respectively at the 0°, 90°, 180° and 270° positions) are recorded respectively; then the three-axis slide is adjusted according to the measurement data, so that the error between the measurement data of the three dial indicators at each moment is less than or equal to a preset second error threshold (for example, the second error threshold can be 0.3 mm, or other suitable values). At this point, it can be confirmed that the center of the standard ball is located at the rotation center of the frame.

[0047] Subsequently, the gantry is fixed at the initial position (for example, the gantry is locked at the 0° position); then, the treatment head is rotated again within the stroke at a preset rotation speed, and the measurement data (for example, readings) of the three dial indicators at at least three moments (for example, the moments when the treatment head is respectively at the 0°, -90° and 90° positions) are recorded respectively; then, the three-axis slide is adjusted according to the measurement data, so that the error between the measurement data of the three dial indicators at each moment is less than or equal to a preset first error threshold (for example, the first error threshold can be 0.1 mm, or other suitable values). At this point, it can be confirmed that the center of the standard sphere is located at the isocenter of the radiological device.

[0048] Therefore, by using the above-mentioned isocenter measurement tool in the present application, the measurement of the isocenter of the radiological equipment can be completed.

[0049] In addition, in the technical solution of the present application, the above-mentioned isocenter measurement tooling can be realized through a variety of specific implementation methods. The following will take several specific methods as examples to introduce the technical solution of the present application in detail.

[0050] For example, as an example, in a specific embodiment of the present application, the connecting member 110 of the connecting device may include: a fixing block 30;

[0051] Clamps 31 are provided at both ends of the fixing block 30 for clamping a mounting plate provided on the radiotherapy head 10 .

[0052] The radiotherapy head of the radiological equipment is generally provided with a mounting plate, and the mounting plate is generally provided with a window for the rays to pass through. Therefore, in the isocenter measurement tool of the present application, the mounting plate provided on the radiotherapy head can be clamped by the clamps at both ends of the fixing block in the above-mentioned connecting member, so that the isocenter measurement tool can be fixed on the radiotherapy head of the radiological equipment.

[0053] In addition, as an example, Figure 3 As shown, in a specific embodiment of the present application, the clamp 31 may include: a base 311, a clamping plate 312 and a fastening bolt 313;

[0054] The base 311 is disposed on the top of the fixing block 30; a sliding groove 314 is disposed in the middle of the base 311; a screw hole is disposed in the sliding groove 314;

[0055] The clamping plate 312 is slidably disposed in the sliding groove 314 of the base 311, and a through groove is disposed in the middle of the clamping plate 312;

[0056] The fastening bolt 313 is disposed in the through slot of the clamping plate 312 , and is used to fix the clamping plate 312 in the sliding slot 314 .

[0057] Therefore, when using the above-mentioned clamp, the fastening bolt can be loosened first, and the clamping plate can be moved in the sliding groove to a suitable position so that the mounting plate on the radiotherapy head is clamped between the clamping plate and the fixed block; then the fastening bolt can be tightened so that the bottom of the fastening bolt is screwed into the screw hole in the sliding groove, and the clamping plate is fixed in the sliding groove so that the clamping plate cannot slide in the sliding groove, so that the mounting plate set on the radiotherapy head can be clamped by the clamping plate to fix the isocenter measurement tool on the radiotherapy head of the radiological equipment. In addition, when it is necessary to disassemble the isocenter measurement tool, it is only necessary to loosen the above-mentioned fastening bolt to disassemble the isocenter measurement tool from the radiotherapy head of the radiological equipment.

[0058] In addition, as an example, in a specific embodiment of the present application, the upper end of the three-axis slide can be connected to the bottom of the connecting device through a connecting plate; a positioning pin hole is provided on the connecting plate for precise positioning with the treatment head.

[0059] Therefore, the three-axis slide can be locked through the above-mentioned connecting plate to ensure that the connection position is not loose, and then the three-axis slide, connecting rod and standard ball can be disassembled as a whole and positioned through the locating pin holes on the connecting plate, thereby ensuring high repeatability and positioning accuracy with little impact on subsequent measurement errors.

[0060] In addition, as an example, in a specific embodiment of the present application, the connecting rod may include: a first connecting rod and a second connecting rod;

[0061] The upper end of the first connecting rod is fixedly connected to the lower end of the three-axis slide, the lower end of the first connecting rod is rotatably connected to the upper end of the second connecting rod, and the lower end of the second connecting rod is fixedly connected to the standard ball.

[0062] Since the first connecting rod and the second connecting rod are rotatably connected, the connecting rod can form bent connecting rods at both ends, so that the position of the standard ball can be finely adjusted more conveniently.

[0063] In addition, as an example, in a specific embodiment of the present application, the first connecting rod and the second connecting rod are in an oblique L-shape.

[0064] Since the first connecting rod and the second connecting rod are in an oblique L-shape, the above-mentioned oblique L-shape of the first connecting rod and the second connecting rod can be matched with the corresponding arrangement of the dial indicator, and the rotation error of the frame and the rotation error of the treatment head can be measured through one installation, and the two sets of data can be calculated by "minimum ball coverage" to obtain the minimum envelope ball of the center of the measuring ball. The center coordinates and the ball radius of the minimum envelope ball are the isocenter coordinates and the isocenter ball radius of the medical linear accelerator respectively. In the prior art, usually only the rotation error of the frame can be measured alone, and the rotation error of the treatment head cannot be measured at the same time, and the isocenter error under the combined influence of the two cannot be calculated.

[0065] In addition, as an example, in a specific embodiment of the present application, the dial indicator can be fixed on the reference surface of the mounting seat by a locking member and a nut.

[0066] In addition, as an example, in a specific embodiment of the present application, the probe of the dial indicator may be cylindrical or disc-shaped.

[0067] In addition, as an example, in a specific embodiment of the present application, the dial indicator can be an electronic indicator or a manual indicator.

[0068] In summary, in the technical solution of the present application, since the isocenter measurement tool is provided with a connecting device, a three-axis slide, a connecting rod, a standard ball, a mounting seat and a dial indicator, it can be connected to the radiotherapy head of the radiological equipment through the connecting device, and the mounting seat is set on the treatment bed, and then the position of the standard ball is adjusted through the three-axis slide and the connecting rod, and the measurement data at each moment is obtained in real time through the dial indicator, so that the isocenter of the radiological equipment can be measured through the above-mentioned isocenter measurement tool. Moreover, further, the error of the isocenter of the radiological equipment can be measured through the isocenter measurement tool in the present application; or, the marking of the isocenter can be completed through the isocenter measurement tool in the present application.

[0069] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of protection of the present invention.

Claims

1. An isocenter measurement tool, characterized in that: The center measurement fixtures include: connecting device, three-axis slide, connecting rod, standard ball, mounting seat and dial indicator; A connecting piece is provided on the top of the connecting device for connecting to a radiotherapy head of a radiological device; The upper end of the three-axis slide is connected to the bottom of the connecting device; The first end of the connecting rod is fixedly connected to the lower end of the three-axis slide, and the second end of the connecting rod is fixedly connected to the standard ball; The mounting seat is arranged on a treatment bed of radiological equipment; three mutually perpendicular reference surfaces are arranged on the mounting seat; a dial indicator is arranged on each reference surface; and the measuring directions of the three dial indicators are mutually perpendicular and point to the same point.

2. The isocenter measurement tool according to claim 1, characterized in that: The connecting member of the connecting device includes: a fixing block; Clamps are arranged at both ends of the fixing block for clamping a mounting plate arranged on the radiotherapy head.

3. The isocenter measurement tool according to claim 2, characterized in that: The clamp comprises: a base, a clamping plate and fastening bolts; The base is arranged on the top of the fixed block; a sliding groove is arranged in the middle of the base; a screw hole is arranged in the sliding groove; The clamping plate is slidably arranged in the sliding groove of the base, and a through groove is arranged in the middle of the clamping plate; The fastening bolt is arranged in the through slot of the clamping plate and is used to fix the clamping plate in the sliding slot.

4. The isocenter measurement tool according to claim 1, characterized in that: The upper end of the three-axis slide is connected to the bottom of the connecting device through a connecting plate; The connecting plate is provided with a positioning pin hole for accurate positioning with the treatment head.

5. The isocenter measurement tool according to claim 1, characterized in that: The connecting rod comprises: a first connecting rod and a second connecting rod; The upper end of the first connecting rod is fixedly connected to the lower end of the three-axis slide, and the lower end of the first connecting rod is rotatably connected to the upper end of the second connecting rod; The lower end of the second connecting rod is fixedly connected to the standard ball.

6. The isocenter measurement tool according to claim 5, characterized in that: The first connecting rod and the second connecting rod are in an oblique L-shape.

7. The isocenter measurement tool according to claim 1, characterized in that: The dial indicator is fixed on the reference surface of the mounting seat through a locking piece and a nut.

8. The isocenter measurement tool according to claim 1, characterized in that: The measuring head of the dial indicator is cylindrical or disc-shaped.

9. The isocenter measurement tool according to claim 1, characterized in that: The dial indicator is an electronic indicator or a manual indicator.

10. The isocenter measurement tool according to claim 1, characterized in that: The measuring direction of the first dial indicator is parallel to the direction of the rotating axis of the frame; The measuring direction of the second dial indicator is parallel to the rotation axis of the treatment head; The measuring direction of the third dial indicator is perpendicular to the measuring directions of the first dial indicator and the second dial indicator.

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