Method for evaluating and optimizing radiotherapy dose based on cone beam CT (Computer Tomography) image CT value correction technology

Abstract

The invention discloses a method for evaluating and optimizing radiotherapy dose based on a cone beam CT (Computer Tomography) image CT value correction technology. The method comprises the following steps of: a, collecting image information; b, making an initial radiotherapy plan; c, acquiring a CT value correction table; d, correcting a CT value of a cone beam CT image; e, drawing a target region and an outline; f, setting a current radiotherapy plan; g, judging whether rigid registration needs to be carried out or not; h, evaluating the current radiotherapy plan; j, carrying out local optimization by taking the current radiotherapy plan as the initial plan if the current radiotherapy plan needs to be optimized; k, off-line evaluating the radiotherapy plan; and l, judging whether the radiotherapy plan needs to be regenerated within a global range or not. According to the method disclosed by the invention, the accuracies of the dose calculation and the dose evaluation are ensured, and the fastness and convenience of the online optimization of the radiotherapy plan are also ensured; and the fastness and convenience of the online optimization are ensured by the local optimization, and the accuracy of the optimization is ensured by the global optimization, thus effective therapy on the target region is ensured, and the damage on normal tissues is avoided as much as possible.

Description

technical field [0001] The present invention relates to a radiotherapy dose assessment and optimization method based on the cone beam CT image CT value correction technology, more specifically, to a method for referring to the CT value of the fan beam CT image collected during radiotherapy positioning, for radiotherapy The technology of individualized correction of the CT value of the cone-beam CT image collected online, and on this basis, the online and offline evaluation of the radiotherapy dose, and then the method of optimizing the radiotherapy plan. Background technique [0002] Modern radiation therapy techniques, such as enhanced radiation therapy, can deliver highly conformal dose distributions to stationary targets. However, the radiation therapy process usually uses a fractionated radiation technique, that is, radiation therapy needs to be given in several sessions. During fractional radiotherapy, the position and shape of the tumor and its surrounding vital organ...

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Problems solved by technology

However, modifying the shape of the radiation field directly according to the deformation of the target area (rather than optimizing the shape of the generat

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