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Computation method of radioactive source error of centralization

A calculation method and radioactive source technology, applied in radioactive sources, radiotherapy, and radiodiagnostic instruments, can solve problems such as inability to accurately calculate radioactive source alignment errors, high design costs, and poor usability, and save a lot of money Time and trial costs, improved accuracy, and cost-saving effects

Inactive Publication Date: 2008-08-27
UNIV OF SHANGHAI FOR SCI & TECH
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  • Abstract
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Problems solved by technology

[0003] The purpose of the present invention is to disclose a calculation method for centering errors of radioactive sources. Aiming at the problem that the centering errors of radioactive sources cannot be accurately calculated in the design stage of existing radiosurgery treatment instruments, a mathematical model is established through theoretical analysis, and the finite element method is used to Calculation, to achieve accurate calculation of the centering error of the radioactive source at the design stage, to overcome the shortcomings of the existing technology that rely on actual measurement to know the size of the error, high design cost, long cycle, poor usability, and low accuracy

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  • Computation method of radioactive source error of centralization
  • Computation method of radioactive source error of centralization
  • Computation method of radioactive source error of centralization

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Embodiment Construction

[0017] The calculation method of the centering error of the radioactive source of the present invention will be further described in detail with reference to the accompanying drawings and embodiments.

[0018] This embodiment is used for the calculation of the radiation focus position accuracy of the "gyro rotating cobalt 60 radiosurgery system".

[0019] First of all, according to the requirements of the finite element software used, set the contact relationship of all parts and components on the roller. Ensure the coordination of the nodes between them when meshing, and then proceed as follows:

[0020] 1. Calculate the weight and center of mass of the treatment head, and simplify the weight of the treatment head to the installation position of the treatment head according to the equivalent principle of mechanics; the simplification of the force should calculate the relationship between the gravity and the center of the cylinder according to the position where the cylinder r...

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Abstract

A method for calculating the error of centralization of a radioactive source is provided, which is based on finite element analysis software. The method is characterized in that the method comprises the following steps: A) calculating the weight and the mass centre of a treatment head, and transferring the weight and the mass center to the mount position of the treatment head according to the mechanical equivalence principle; B) designing a cover needle as a representative of the treatment head, which structurally comprises a top cover and a needle connected with the center of the top cover, wherein the top cover is positioned at the site of the treatment head and the needle tip is positioned at the center of a roller to represent the focus point of a radioactive source, the mass of the cover needle is negligible, and the deformation of the cover needle is negligible for the rigidity of the cover needle is extremely large; C) configuring parameters and limits required by finite element analysis according to the material physical parameters of the roller; and D) calculating the stress and the displacement of components of the roller by using the finite element analysis software, wherein the calculated displacement value of the needle tip of the cover needle is the error value of centralization of the radioactive source. The invention can relatively accurately calculate the error of centralization of the radioactive source during the design step, optimize the structural design, increase the design accuracy, and reduce consumption of time and cost.

Description

technical field [0001] The invention relates to a non-mechanical contact device using a laser radiation source or other radiation sources, and a calculation method for measuring the centering error of the radiation source, in particular to a calculation method for the centering error of the radiation source of a radiosurgery treatment instrument. Background technique [0002] The radiosurgery treatment instrument is a treatment instrument that uses x or gamma rays of radioactive materials to kill cancer cells. The radiosurgery treatment instrument is mainly composed of a roller and a treatment head. The installation position of the treatment head determines the position of the radiation focus. The focus position is If the location of the cancer cells is inaccurate, not only the cancer cells will not be killed, but also the normal cells will be killed, causing health damage to the patient. During the treatment, in order to prevent the focus of the radiation from being concent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B6/00A61B18/20A61N5/067G06F17/00G06F17/50G21G4/08
Inventor 仲梁维徐增豪倪静吴觉士
Owner UNIV OF SHANGHAI FOR SCI & TECH
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