A tracking method for tumor position changes during radiotherapy

Abstract

A method for tracking changes in tumor positions during radiotherapy, the method comprising the following steps: collecting images taken by nuclear magnetic resonance postures of four standard body positions of the human body, obtaining tumor positions in each main posture of the human body, and using an image processing method to obtain Based on the establishment of a database of human tumor locations, a large number of training samples are obtained by using the rotation method, and the cnn convolutional neural network is used for identification and calculation; by obtaining the tumor location taken by the MRI posture when the current human body is in a certain posture, and comparing the patient's current position The position and posture changes between the body position and the standard body position are searched and compared in the 3D model to compare the position of the tumor at this time, and the error e between the current tumor position predicted by the 3D model and the actual position of the tumor taken by MRI is judged, and the model is tracked based on the error. Accuracy is adjusted.

Description

technical field [0001] The present invention relates to the technical field of tumor position tracking, in particular to a tracking method for changes in the position of tumors caused by changes in the posture and position of the human body. Background technique [0002] In traditional radiation therapy, after determining the indications for radiotherapy, doctors, physicists and technicians select and make fixed molds according to the specific conditions of the patient (to ensure good repeatability of body positions during each radiotherapy, and to make the patient feel comfortable as much as possible, reducing The impact of body position change error on precise radiotherapy, to ensure accurate radiotherapy). Under normal circumstances, after the CT scan is completed, the image data is transmitted to the planning system of the radiotherapy department. Patients with head and neck tumors choose plastic mask or head, neck and shoulder membrane fixation, while patients with tho...

AI Technical Summary

Problems solved by technology

[0006] What needs to be specially explained is: the first positioning needs to be carefully verified in order to ensure the accuracy of each treatment in the future. It may take longer, but generally you can persist. The treatment time will be shorter in the future. Ordinary radiotherapy usually takes a few minutes, which is complicated. The conformal intensity-modulated radiotherapy may take more than 20 minutes. During the radiotherapy, you should pay attention to protecting the various marks painted on your body. You cannot scrub them off, otherwise you need to reposition them

[0007] The inventor found in the research and development process that although the position of the tumor can be determined and the treatment area can be determined according to the position in the current radiation therapy process, the patient needs various jigs and brackets in the process of radiation therapy to adjust the body posture and position. Fixed, and the accuracy of the patient's body posture is high during radiotherapy, the patient must maintain a fixed posture for a long time, otherwise the treatment must be stopped immediately and treated accordingly, and re-treatment after correction, which is very harmful to the patient Difficulty, and also have a greater impact on the treatment effect and efficiency

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