A method to track changes in tumor location during radiation therapy

Abstract

A method for tracking changes in tumor position during radiotherapy, the method includes the following steps: collecting images of four standard body postures of the human body taken by nuclear magnetic resonance postures, acquiring tumor positions in each main posture of the human body, establishing a database of human tumor positions, and using The rotation method obtains a large number of training samples, and uses the CNN convolutional neural network for identification and calculation; by obtaining the tumor position of the current human body in a certain posture, comparing the posture changes between the patient's current posture and the standard posture, and searching and comparing in the three-dimensional model At this time, the position of the tumor is determined, and the error e between the current predicted tumor position based on the 3D model and the actual position of the tumor captured by the MRI is determined, and the accuracy of the model tracking is adjusted based on the error, so as to achieve the accuracy that can be used in the posture and placement of the human body. When changing, the position of the tumor can be accurately tracked according to the image, and the error existing in the position tracking can be eliminated through calibration.

Description

technical field [0001] The invention relates to the technical field of tumor position tracking, in particular to a tracking technology for tumor position changes due to changes in the posture and position of a human body during radiotherapy. Background technique [0002] In traditional radiotherapy, after determining the indication of radiotherapy, doctors, physicists and technicians select and make a fixed mold according to the specific situation of the patient (to ensure good position repeatability during each radiotherapy, and try to make the patient feel comfortable, reduce The influence of postural 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 radiotherapy department planning system. Patients with head and neck tumors choose plastic mask or head, neck and shoulder film fixation, while patients with thoracic and abdominal tumors choose negative press...

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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