Marking projection-based radiotherapy auxiliary positioning method and device

Abstract

The invention discloses a marking projection-based radiotherapy auxiliary positioning method and device. The method comprises the following steps: S1, starting positioning operation; S2, judging whether the patient is positioned for the first time or not; if yes, entering S3; otherwise, a projector projects a marked projection image, a technician moves the patient to the position of a projection mark point according to the position of the projection mark point in the marked projection image, and positioning is completed; S3, specifically comprising the following steps: S3.1, at least pasting three mark stickers on the surface of the thermoplastic film for fixing the patient; S3.2, carrying out accurate positioning; S3.3, projecting a picture by the projector, and synchronously acquiring a reference image by the camera; S3.4, identifying pixel coordinates of the mark points in the reference image; S3.5, calculating three-dimensional physical coordinates corresponding to the pixel coordinate of the mark points; S3.6, calculating two-dimensional pixel coordinates of the projection image of the projector corresponding to the three-dimensional coordinates of the marking points, and generating a marking projection image; and S3.7, completing the positioning. According to the invention, the technician can intuitively and conveniently carry out positioning operation, and a rapid and accurate positioning effect is realized.

Description

technical field [0001] The invention belongs to the technical field of radiation therapy, and in particular relates to a marker projection-based auxiliary positioning method and device for radiation therapy. Background technique [0002] With the rapid development of radiation physics technology, computer technology and medical imaging technology, advanced radiation therapy technologies such as three-dimensional conformal radiation therapy, intensity-modulated radiation therapy, volume rotation intensity-modulated radiation therapy and helical tomotherapy are constantly innovating. The new technologies represented by radiotherapy, dose-guided radiotherapy and radiomics have pushed radiotherapy towards the era of "three precision radiotherapy" with "precise positioning", "precise planning" and "precise treatment" as the ultimate goals. The projection auxiliary positioning device is a radiotherapy auxiliary positioning device based on machine vision. Before the patient is posi...

AI Technical Summary

Problems solved by technology

[0003]At present, the traditional positioning method for radiotherapy is mainly based on the laser light on the indoor wall for pre-positioning, but each time the patient performs pre-positioning to align the marking lines After the laser light, CBCT or EPEI is required to perform setup verification again, which increases the complexity of setup

Others, such as optical positioning devices, mostly use reflective infrared marking balls. For example, a patent document with application number 201710646652.6 proposes a near-infrared binocular vision stereo matching method based on reflective ball marking points, but it does not have a visible light projection device. Impossible to directly visualize the placement effect

Images