Isocenter measuring device
By designing an isocentric measurement device including a mold, a film box, a rotating handle and a base, the problem of deviation measurement and correction in the quality control process of center measurement such as gamma knife equipment is solved, and the rapid and accurate overlap between the mechanical isocentric and the gamma ray center is achieved, ensuring the accuracy of ray focus during the treatment process.
Patent Information
- Application Number
- CN202421434376.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-21
- Publication Date
- 2025-04-08
- Estimated Expiration
- 2034-06-21
AI Technical Summary
In the process of isocenter measurement and quality control of gamma knife equipment, it is difficult for the prior art to quickly and accurately measure and correct the deviation between the mechanical isocenter of the equipment and the gamma ray focus center.
An isocenter measurement device is designed, including a mold, a film box, a rotating handle and a base. The mold can be rotated by rotating the handle, and a film box is embedded in the mold. The film is irradiated with γ rays to form a developing circle and a hole. The film image is analyzed by a scanner, the deviation between the mechanical center and the γ ray center is calculated, and the treatment bed is corrected.
It can quickly and conveniently measure whether the centers such as equipment are offset, and the specific value of the offset can be calculated. Through the compensation of the treatment bed, the centers such as machinery are overlapped with the γ-ray irradiation center to ensure the accurate focus of the γ-ray during the treatment process.
Smart Images
Figure CN222733554U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the medical field, in particular to an isocenter measuring device. Background Art
[0002] Gamma Knife is a large-scale radiotherapy device that integrates stereotactic technology and radiosurgery technology, mainly used to treat craniocerebral diseases. Its treatment principle is similar to the focusing process of a magnifying glass. The radiation beams are cross-superimposed through a collimator so that the lesion area receives a high dose, while the normal tissues that each beam passes through receive a lower dose, thereby reducing the damage of radiotherapy to normal tissues. In this process, it is very important to accurately focus the focused beam on the patient's lesion. In the daily isocenter measurement quality control process of the Gamma Knife, it is necessary to measure the isocenter of the Gamma Knife (the isocenter is the coordinate origin of the entire treatment planning system. The planning system is carried out in the isocenter coordinate system when outlining the target area, outlining the organs at risk, and placing the target points. The mechanical isocenter is the common intersection of the rotation axis of the treatment head and the rotation axis of the drum. The zero position of the treatment bed is the position when all the motion axes are at zero point) to ensure the accuracy of the equipment's isocenter coordinate system.
[0003] Therefore, it is necessary to provide a new technical solution to solve the mechanical isocenter measurement needs of gamma knife equipment. Utility Model Content
[0004] In order to solve the above technical problems existing in the background technology, the utility model provides an isocenter measuring device, which can quickly and accurately measure and correct the isocenter of a gamma knife.
[0005] The technical solution of the utility model is: the utility model is an isocenter measuring device, which is special in that: the isocenter measuring device comprises a phantom, a film box, a rotating handle and a base, the film box is arranged on the phantom, the phantom is arranged on the base by rotating the handle, and the phantom can be rotated by rotating the handle.
[0006] Furthermore, the phantom is in a spherical shape.
[0007] Furthermore, a groove is transversely arranged in the middle of the mold body, and the film box is embedded in the groove.
[0008] Furthermore, the groove is located at the center of the mold body.
[0009] Furthermore, brackets are respectively arranged on both sides of the base, and the mold body is arranged on the brackets by rotating the handle.
[0010] Furthermore, the film box includes a film box bottom plate, film and a film box cover plate, the film is arranged on the film box bottom plate, the film box cover plate covers the film box bottom plate and is movably connected with the film box bottom plate, and a center hole is arranged at the center of the film box cover plate.
[0011] The utility model provides an isocenter measuring device, which is used for radiotherapy equipment and can quickly and conveniently measure whether the isocenter of the equipment is offset, and can calculate the specific value of the offset (offset distance), and make corrections through the treatment bed accordingly. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 It is a structural schematic diagram of the utility model;
[0013] Figure 2 It is a schematic diagram of the film box structure of the utility model;
[0014] Figure 3 It is a schematic diagram of the interior of the film box of the utility model;
[0015] Figure 4 It is a schematic diagram of the utility model in XY plane measurement;
[0016] Figure 5 It is a schematic diagram of the utility model for measuring in the YZ plane.
[0017] The following are the descriptions of the reference numerals:
[0018] 1. Model; 2. Film box; 3. Turning handle; 4. Base;
[0019] 2.1. Film box bottom plate; 2.2. Film; 2.3. Film box cover plate; 2.4. Center hole. DETAILED DESCRIPTION
[0020] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.
[0021] See also Figure 1 The structure of a specific embodiment of the utility model includes a phantom 1, a film box 2, a rotating handle 3 and a base 4; the film box 2 is arranged on the phantom 1, and the phantom 1 is arranged on the base 4 by rotating the handle 3, and the phantom 1 can be rotated by rotating the handle. The phantom 1 is in the shape of a sphere. A groove is horizontally arranged in the middle of the phantom 1, and the film box 2 is embedded in the groove. The groove is located at the center of the phantom 1. In this embodiment, brackets are respectively arranged on both sides of the base 4, and the phantom 1 is arranged on the bracket by rotating the handle 3. When in use, the rotating handle 3 can be rotated 90° and locked to measure the three-dimensional coordinate deviation of the isocenter.
[0022] See also Figure 2 , 3The structure of the specific embodiment of the film box 2 of the utility model comprises a film box bottom plate 2.1, a film 2.2, a film box cover plate 2.3 and a center hole 2.4. The film 2.2 is arranged on the film box bottom plate 2.1, the film box cover plate 2.3 is on the film box bottom plate 2.1 and is movably connected with the film box bottom plate 2.1, and a center hole 2.4 is arranged at the center of the film box cover plate 2.3.
[0023] The method of using the utility model is as follows:
[0024] Generally speaking, the mechanical isocenter needs to coincide with the center of the gamma ray focus irradiation, but due to the influence of mechanical precision, the zero position may not coincide with the mechanical isocenter. In this case, it is necessary to move the zero position of the treatment bed to coincide with the mechanical isocenter and perform mechanical corrections to ensure that the gamma ray can be focused and aimed during the treatment.
[0025] When measuring the isocenter during equipment quality control work, the three coordinate axes of the Gamma Knife treatment bed are moved to the origin position to reach the mechanical isocenter.
[0026] See also Figure 4 When measuring the XY plane, make the rotating axis of the equipment roller treatment head perpendicular to the vertical plane, rotate the phantom 1 of the isocenter measurement device to the XY plane state, then insert the film box into the phantom, and open the device for irradiation (the open source irradiation of the equipment can pass through the phantom 1, and the material density of the phantom 1 should be close to that of human tissue). After a certain period of time, take out the film box 2, and pierce a small hole on the film 2.2 through the center hole 2.4. This small hole is the origin of the mechanical isocenter coordinates of the XY plane. The circular center formed by the irradiation on the film 2.2 is the γ-ray irradiation center. Use a scanner to scan the developed shape of the film and the hole on the film into an image that can be analyzed by the software, so as to compare the positions of the two centers. In this way, the deviation between the mechanical isocenter and the γ beam center can be obtained, and the two centers can be overlapped by compensation of the treatment bed.
[0027] See also Figure 5 Similarly, the rotation axis of the roller treatment head of the equipment is perpendicular to the YZ plane, and the ball mold is rotated to the YZ plane position. After the γ-ray device is open-sourced for irradiation for a certain period of time, the mechanical isocenter of the treatment bed is obtained on the film. By comparing it with the developed circle on the film, it can be determined whether the isocenter is deviated. The mechanical isocenter can be made to coincide with the γ-ray irradiation center by moving the treatment bed, thereby achieving the purpose of measuring and correcting the isocenter.
[0028] The content of the utility model and the technical content not specifically described in the above embodiments are the same as the prior art. The above are only specific implementation methods disclosed by the utility model, but the protection scope disclosed by the utility model is not limited thereto. The protection scope disclosed by the utility model shall be subject to the protection scope of the claims.
Claims
1. An isocenter measurement device, characterized in that: The isocenter measuring device includes a mold body, a film box, a rotating handle and a base. The film box is arranged on the mold body, and the mold body is arranged on the base by rotating the handle. The film box includes a film box bottom plate, a film and a film box cover plate. The film is arranged on the film box bottom plate. The film box cover plate covers the film box bottom plate and is movably connected with the film box bottom plate. A center hole is arranged at the center of the film box cover plate.
2. The isocenter measurement device according to claim 1, characterized in that: The phantom is in a spherical shape.
3. The isocenter measurement device according to claim 2, characterized in that: A groove is transversely arranged in the middle of the mold body, and the film box is embedded in the groove.
4. The isocenter measurement device according to claim 3, characterized in that: The groove is located at the center of the mold body.
5. The isocenter measurement device according to claim 4, characterized in that: Brackets are respectively arranged on both sides of the base, and the mold body is arranged on the brackets by rotating a handle.