Computation method of radioactive source error of centralization

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...

AI Technical Summary

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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