Inverse treatment planning method of treatment plan and treatment planning system

Abstract

The invention discloses an inverse treatment planning method of a treatment plan. The method comprises the following steps of: A, inputting a medical image of a patient; B, drawing tissue outlines of a body surface, a target body and injured organs of the patient; C, setting an inverse planning target; D, creating an initial treatment plan; E, setting iterative optimization parameters; F, generating an individual treatment plan; G, calculating a dose field of the individual treatment plan; H, selecting a current optimum plan according to the dose field; I, executing the step L if a difference value between the current optimum plan and the inverse planning target is smaller than a preset first threshold value, or executing the next step; J, executing the step L if the number of times of evolution is equal to the number of frequencies of population evolution, or executing the next step; K, evolving generation to new-generation population by mating and/or variation, and executing the step G; and L, stopping the population evolution and outputting the current optimum plan. The invention also discloses a treatment planning system. By adoption of a population evolution method based on a gene algorithm, iteration is carried out by a mating or variation method, so that the whole iterative process is simple and efficient.

Description

technical field [0001] The invention relates to a radiotherapy planning technology, in particular to a radiotherapy planning reverse planning method and a treatment planning system. Background technique [0002] Stereotactic radiosurgery or stereotactic radiosurgery are two common radiotherapy techniques in radiotherapy, and the common devices are Gamma Knife based on cobalt-60 radiation source and X-Knife based on electron accelerator. The former usually uses multiple cobalt-60 radiation sources to focus on irradiation, so that the target body receives high-dose uniform irradiation while the surrounding healthy tissues receive low dose to achieve the purpose of controlling or eradicating lesions. Before radiation therapy can be administered with the Gamma Knife device, an acceptable radiation treatment plan usually needs to be developed. Gamma Knife treatment planning is usually done manually in an interactive and iterative manner. This is a forward planning process, that...

AI Technical Summary

Problems solved by technology

Due to the limited size of collimators available for Gamma Knife, treatment planning usually requires multiple targets to be irradiated, so many parameters need to be adjusted, especially when the target volume is large and irregular, or the target is close When there is a healthy organization, this is a very time-consuming process while demanding the experience and skills of the plan designer

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