Electric multi-leaf collimator leaf position control method and device

Abstract

The invention provides an electric multi-leaf collimator leaf position control method and device. The method comprises the following steps: obtaining child radiation field information of at least one child radiation field from a position file, wherein the child radiation field information of each child radiation field comprises expected value of leaf position corresponding to the child radiation field, and expected value of position influence parameters corresponding to the child radiation field, and the at least one child radiation field is associated with a currently-controlled target control period; according to parameter change rate at the starting time point of the target control period, obtaining actual value of the position influence parameters corresponding to the target control period; obtaining leaf position information corresponding to the actual value according to the actual value, the child radiation field information and a variable relationship, wherein the variable relationship is quantitative relation between the leaf position information and the position influence parameters; and in the target control period, controlling leaves to execute movement corresponding to the leaf position information. Control precision of leaf position is improved obviously.

Description

technical field [0001] The present application relates to medical equipment technology, in particular to a method and device for controlling the leaf position of an electric multi-leaf collimator. Background technique [0002] Radiation therapy is a conventional method for treating tumors. Its core purpose is to use the rays emitted by the accelerator to kill the tumor tissue to a great extent and protect the surrounding normal tissues as much as possible. The range of irradiation is limited to avoid damage to normal tissue surrounding the tumor. The electric multi-leaf collimator is an important part in radiation therapy. The collimator is set in the accelerator to limit the irradiation range of the radiation; the collimator includes many blades, the radiation cannot pass through the blades, and the blades are not blocked Only the area of ​​the blade can allow the rays to pass through, so that the purpose of limiting the irradiation range of the beam of rays can be achieve...

AI Technical Summary

Problems solved by technology

At present, the moving position of the leaves is usually controlled according to time, but this control method may affect the control accuracy of the electric multi-leaf collimator system. It is difficult to keep the dose rate constant during the whole beam output process, resulting in that when a specific beam output is reached, the position of the blade cannot meet the requirements, thus affecting the treatment effect

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