Radiology equipment isocenter detection device

By designing a detection device including a three-axis sliding table, connecting rod, standard ball and range measuring sensor, the problem of insufficient detection accuracy of the center in the prior art is solved, and rapid and accurate calibration and detection of centers such as radiological equipment is achieved to meet the requirements of high accuracy.

CN222544659UActive Publication Date: 2025-02-28SPARTICLE HEALTHCARE CO LTD
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Patent Information

Application Number
CN202420912364.6
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-04-28
Publication Date
2025-02-28
Estimated Expiration
2034-04-28

AI Technical Summary

Technical Problem

The prior art medium-center detection methods have insufficient accuracy, especially in the case of high accuracy requirements, it is difficult to achieve high accuracy in judgment of naked eyes, and it is impossible to capture bearing jump errors and actual common point errors.

Method used

A detection device for centers such as radiological equipment is designed, including a connecting device, a three-axis slide table, a connecting rod, a standard ball, a multiple measuring brackets and a multiple ranging sensor. The standard ball is driven to move through a three-axis sliding table and connecting rod, and the standard ball is measured in real time using multiple distance measuring sensors to determine the isocentric position.

Benefits of technology

It realizes rapid and accurate calibration and detection of centers such as radiological equipment, can meet high-precision requirements, reduces operational complexity and positioning requirements, and improves detection efficiency and accuracy.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model provides a radiology equipment isocenter detection device. The radiology equipment isocenter detection device comprises a connecting device, a three-axis sliding table, a connecting rod, a standard ball, a plurality of measuring supports and a plurality of distance measuring sensors. The connecting device is used for being connected with a radiotherapy head of radiology equipment to be tested; 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; each measuring support is provided with a distance measuring sensor. And the measuring direction of each distance measuring sensor points to the sphere center area of the standard sphere. According to the invention, the isocenter of the radiology equipment can be quickly calibrated and detected.
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Description

Technical Field

[0001] The present application relates to the technical field of measurement of radiological equipment, and in particular to a detection device for isocenter of radiological equipment. Background Art

[0002] Radiotherapy equipment is a medical device that uses radiation to treat tumors. The definition of isocenter in medical radiology terminology is: in radiological equipment, the reference axis of various movements moves around a common center point, and the radiation axis passes through the smallest sphere centered on this point. This point is the isocenter.

[0003] 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.

[0004] The isocenter includes the mechanical isocenter and the radiation isocenter. The isocenter in this application mainly refers to the mechanical isocenter. The national standard requires that the treatment head rotation axis passes through the gantry rotation axis and the treatment bed revolution axis in space orthogonal deviation sphere within ±2mm. For conformal, intensity modulated, and stereotactic radiotherapy, the deviation sphere is required to be within ±1mm.

[0005] At present, the commonly used isocenter detection method in the prior art is the pointer method, which is specifically: place a pointer on the treatment bed and another pointer on the treatment head. When the frame and the treatment head rotate respectively, adjust the two pointers so that the distance between the needle tips of the two pointers is always kept within the set range (usually 1mm), and the needle tips of the pointers can be regarded as the isocenter point. In addition, a pointer and a coordinate paper can also be used to detect the isocenter, and the principle of the method is similar.

[0006] The above-mentioned pointer method is easy to operate and has high efficiency. When checking whether it is qualified, it only needs to rotate the frame and the treatment head once. However, the above-mentioned pointer method has the following disadvantages:

[0007] First, during the rotation process, the distance is judged by the naked eye, which is not accurate enough. Once auxiliary tools such as sports cameras are used, the simplicity is lost. Moreover, with the advancement of technology, the accuracy requirements for the center of gravity are getting higher and higher. Currently, high-end products in the industry require the deviation sphere to be ±0.5mm or even smaller, which is difficult to achieve such high-precision judgment with the naked eye.

[0008] Second, in principle, this method is to simply superimpose the trajectories of two orthogonal planes. However, taking the rotation of the frame as an example, when the center of the frame rotates, the bearing will have a certain axial runout, and this error cannot be given by the pointer method. In addition, the superposition of the two plane trajectories should be at a common point, and the default common point of the pointer method is not the actual point. These all cause certain errors. Utility Model Content

[0009] In view of this, the utility model provides a detection device for the isocenter of radiological equipment, so that the calibration and detection of the isocenter of the radiological equipment can be completed quickly.

[0010] The technical solution of the utility model is specifically achieved as follows:

[0011] A detection device for isocenter of radiological equipment, the detection device comprising: a connecting device, a three-axis slide table, a connecting rod, a standard ball, a plurality of measuring brackets and a plurality of distance measuring sensors;

[0012] The connecting device is used to connect to the radiotherapy head of the radiological device to be tested;

[0013] The upper end of the three-axis slide is connected to the bottom of the connecting device;

[0014] 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;

[0015] Each measuring bracket is provided with a distance measuring sensor; the measuring direction of each distance measuring sensor points to the center area of ​​the standard ball.

[0016] Preferably, the upper end of the three-axis slide is connected to the bottom of the connecting device through a connecting plate;

[0017] The connecting plate is provided with a positioning pin hole for accurate positioning with the treatment head.

[0018] Preferably, the connecting rod comprises: a first connecting rod and a second connecting rod;

[0019] 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.

[0020] Preferably, the distance measuring sensor is a laser distance measuring sensor.

[0021] Preferably, the number of the distance measuring sensors and the measuring brackets is three.

[0022] Preferably, the plurality of measuring supports are arranged on a treatment bed of the radiological device to be measured.

[0023] Preferably, the measuring direction of the distance measuring sensor is the emission direction of the ray emitted by the probe of the distance measuring sensor.

[0024] As can be seen from the above, in the detection device for the isocenter of the radiological equipment in the utility model, since a three-axis slide is provided on the treatment head, a standard ball tooling is provided on the three-axis slide, and then a plurality of measuring brackets are provided, and a ranging sensor is provided on each measuring bracket, the treatment head or the frame can be rotated separately, and then the standard ball can be measured in real time by the plurality of ranging sensors, and the isocenter of the radiological equipment to be tested can be determined by the real-time measurement data, so that the calibration and detection of the isocenter of the radiological equipment can be completed quickly. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Schematic diagram of a detection device for isocenter of radiological equipment in an embodiment of the present utility model Figure 1 .

[0026] Figure 2 Schematic diagram of a detection device for isocenter of radiological equipment in an embodiment of the present utility model Figure 2 .

[0027] Figure 3 Schematic diagram of a detection device for isocenter of radiological equipment in an embodiment of the present utility model Figure 3 . DETAILED DESCRIPTION

[0028] 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.

[0029] Figure 1 to Figure 3 Schematic diagram of a detection device for isocenter of radiological equipment in an embodiment of the present utility model. Figure 1 to Figure 3 As shown, the detection device of the isocenter of the radiological equipment in the embodiment of the present application may include: a connecting device (not shown in the figure), a three-axis slide 22, a connecting rod 23, a standard ball 24, a plurality of measuring brackets 25 and a plurality of distance measuring sensors 26;

[0030] The connecting device is used to connect to the radiotherapy head 20 of the radiological device to be tested;

[0031] The upper end of the three-axis slide 22 is connected to the bottom of the connecting device;

[0032] The first end of the connecting rod 23 is fixedly connected to the lower end of the three-axis slide 22, and the second end of the connecting rod 23 is fixedly connected to the standard ball 24;

[0033] A distance measuring sensor 26 is disposed on each measuring bracket 25 ; the measuring direction of each distance measuring sensor 26 (for example, the emitting direction of the radiation emitted by the probe of the distance measuring sensor) points to the center area of ​​the standard sphere 24 .

[0034] In the technical solution of the present application, the above-mentioned detection device of the isocenter of the radiological equipment can be connected to the radiotherapy head of the radiological equipment to be tested through a connecting device, and the three-axis slide set at the bottom of the connecting device can move along 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. In addition, multiple measuring brackets are also provided (for example, multiple measuring brackets can be provided on the treatment bed of the radiological equipment to be tested, or multiple measuring brackets with a height close to that of the treatment bed can be directly provided), and a distance sensor is provided on each measuring bracket, so that each distance sensor surrounds the standard ball, and the measurement direction of each distance sensor (for example, the emission direction of the laser beam emitted by the laser distance sensor) points to the center area of ​​the standard ball (the measurement direction of the distance sensor can be directed to the center of the standard ball as much as possible, but it is not strictly required).

[0035] Since the radius of the standard sphere is known and has high accuracy, after setting up the standard sphere tooling (including: connecting rod and standard sphere) and the ranging sensor, the positional relationship between each ranging sensor and the standard sphere (including: the distance and angle between the ranging sensor and the standard sphere, etc.) can be further determined.

[0036] Therefore, when using the above detection device to measure the isocenter of the radiological device to be tested, the gantry can be first fixed at the initial position (for example, the position of the gantry is locked at the position of 0°), and then the treatment head is rotated at a preset speed within the stroke, and the real-time measurement data of each ranging sensor is recorded; then, the center point trajectory of the treatment head when it rotates can be obtained based on the recorded real-time measurement data. Subsequently, the treatment head can be fixed at the initial position (for example, the position of the treatment head is locked at the position of 0°), and then the gantry is rotated at a preset speed within the stroke, and the real-time measurement data of each ranging sensor is recorded; then, the center point trajectory of the gantry when it rotates can be obtained based on the recorded real-time measurement data. After obtaining the center point trajectory of the treatment head when it rotates and the center point trajectory of the gantry when it rotates, the two center point trajectories can be rotated and superimposed to obtain the isocenter point cloud in space; then, the isocenter of the radiological device to be tested can be determined based on the minimum sphere radius of all point clouds in the isocenter point cloud and the preset threshold.

[0037] In addition, in the technical solution of the present application, after the isocenter of the radiological device to be tested is determined, the three-axis slide table can be moved according to the position coordinates of the isocenter to move the center of the standard sphere to the position coordinates of the isocenter.

[0038] In addition, in the technical solution of the present application, the above-mentioned detection device of the isocenter of radiological equipment can be realized by 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.

[0039] 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 (not shown in the figure); a positioning pin hole is provided on the connecting plate for precise positioning with the treatment head.

[0040] 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.

[0041] 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 (not shown in the figure);

[0042] 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.

[0043] 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.

[0044] In addition, as an example, in a specific embodiment of the present application, the distance measuring sensor may be a laser distance measuring sensor or other suitable distance measuring sensors.

[0045] In addition, as an example, in a specific embodiment of the present application, the plurality of measurement supports are arranged on a treatment bed of the radiological device to be measured.

[0046] In addition, in the technical solution of the present application, the number and specific positions of the above-mentioned distance measuring sensors (or measuring brackets) can be preset according to the needs of actual application conditions.

[0047] For example, as an example, in a specific embodiment of the present invention, the number of the distance measuring sensors (or measuring brackets) may be three, or more than three.

[0048] For another example, as an example, in a specific embodiment of the present invention, at least three measuring brackets provided with distance measuring sensors can be respectively arranged at preset positions, so that each distance measuring sensor surrounds the standard ball on the standard ball fixture, and the measuring direction of each distance measuring sensor (for example, the emission direction of the laser beam emitted by the laser distance measuring sensor) points to the center area of ​​the standard ball (the measuring direction of the distance measuring sensor can be made to point to the center of the standard ball as much as possible, but it is not strictly required), such as Figure 3 In addition, the triangles extending from the distance measuring sensor in the various figures of the present application are used to represent the approximate area where the laser is emitted and reflected back, and are not actual components.

[0049] To summarize, in the technical solution of the present application, since a three-axis slide is provided on the treatment head, a standard ball tooling is provided on the three-axis slide, and then multiple measuring brackets are provided, and a ranging sensor is provided on each measuring bracket, the treatment head or the frame can be rotated separately, and then the standard ball can be measured in real time by multiple ranging sensors, and the isocenter of the radiological equipment to be tested can be determined by the real-time measurement data, so that the calibration and detection of the isocenter of the radiological equipment can be quickly completed.

[0050] In addition, in the prior art, when determining the isocenter, a relatively accurate position (for example, the measurement axis is consistent with the X-axis, etc.) is usually required for determination. In the technical solution of the present application, it is only required that the distance measuring sensor can point to the center of the standard ball well, and a very accurate position is not required. In addition, the distance measuring sensor can determine the position of the distance measuring sensor through 5 positions each time, without considering positioning, and the workload is small under the premise of computer-assisted processing.

[0051] Therefore, the technical solution of the present application also has many advantages such as simple operation, low positioning requirements, accurate positioning, and can be quickly completed with the help of computing tools, and can be widely used in various radiological equipment.

[0052] 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. A device for detecting the isocenter of radiological equipment, characterized in that: The detection device comprises: a connecting device, a three-axis slide table, a connecting rod, a standard ball, a plurality of measuring brackets and a plurality of distance measuring sensors; The connecting device is used to connect to the radiotherapy head of the radiological device to be tested; 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; Each measuring bracket is provided with a distance measuring sensor; the measuring direction of each distance measuring sensor points to the center area of ​​the standard ball.

2. The detection device 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.

3. The detection device 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, 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.

4. The detection device according to claim 1, characterized in that: The distance measuring sensor is a laser distance measuring sensor.

5. The detection device according to claim 1, characterized in that: The number of the distance measuring sensors and the measuring brackets is three.

6. The detection device according to claim 1, characterized in that: The plurality of measuring supports are arranged on a treatment bed of the radiological device to be measured.

7. The detection device according to claim 1, characterized in that: The measuring direction of the distance measuring sensor is the direction in which the rays emitted by the measuring head of the distance measuring sensor are emitted.