Method for designing noncoplanar volumetric rotational intensity modulated radiotherapy plan

Abstract

The invention discloses a method for computer-assisted designing noncoplanar volumetric rotational intensity modulated radiotherapy plan. The content of the method includes the steps that medical images of a diseased area and a peripheral human tissue of a patient are collected through an imaging device, three-dimensional contour data of a region of interest are collected through a software assembly, the total hop count is collected through a user input device, a target and a constraint condition are optimized, the hop count of a treating device is taken as a time unit, the total hop count isequally divided, a group of machine parameters are selected randomly for all equal diversion points, a group of machine parameters with the equal diversion points of any adjacent hop count meeting theconstraint condition are screened and retained, a group of initial VMAT plan is generated on the basis of the machine parameter, on the premise of the constraint condition is met, the plan is updatedby using a direct optimizing algorithm, dosage gridding is built according to patient data, dosage distribution is calculated based on the dosage gridding, an objective function value is calculated,the plan is updated by repeatedly using the direct optimizing algorithm until a suspensive condition is met, and an optimized plan is output.

Description

technical field [0001] The invention relates to medical device software in the field of radiotherapy, in particular to a method for generating an optimized non-coplanar volume-rotating intensity-modulated radiotherapy (VMAT) radiotherapy plan. Background technique [0002] Radiation therapy is a method widely used to treat tumors. In a typical radiotherapy case, the equipment that generates ionizing rays in the radiotherapy system is fixed in the rack. The radiation therapy system controls the rotation of the gantry so that the beam of ionizing radiation produced by the device is aimed at a specific point in space, often referred to as the "machine isocenter". Before the start of radiation therapy, the treatment bed carries the patient and positions it according to the plan, so that the tumor in the patient's body is always located at the isocenter of the machine during the treatment process. [0003] Typically, radiation therapy planning consists of a set of sessions in w...

AI Technical Summary

Problems solved by technology

The disadvantage of IMRT is that it can only select a limited number of angles for irradiation in a stepwise manner, leaving little room for using various optimization methods to improve radiotherapy planning and improve treatment effects

[0006] The VMAT method provides better application prospects, but the popularization of VMAT needs to solve a complex problem first: how to design and optimize a VMAT plan

[0008] Another shortcoming of the current VMAT plan design method is that the current method is mainly suitable for designing coplanar VMAT plans

This approach simplifies the design of VMAT and the process of implementing radiotherapy, but also reduces the room for further optimization of the VMAT plan to improve the quality of the plan

However, considering the synchronized motion of the gantry, couch, and collimator in the planning optimization method would greatly increase the level of complexity, thus requiring a more efficient optimization method

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