Method for predicting human body thoracico-abdominal surface area respiratory movement in radiotherapy

Abstract

The method provides a method for predicting the human body thoracico-abdominal surface area respiratory movement in radiotherapy, belonging to the field of tumor treatment and respiratory motion prediction. The prediction method with the respiratory motion prediction function adopts a dual-camera to collect respiration motion signal data, the collected data are preprocessed, and the obtained datais used as the input of a Gaussian process regression prediction algorithm. Then, a Gaussian process model is provided for predicting the regression problem. A proper regression model is constructedby utilizing the data, training and prediction are carried out, a kernel function is selected in the training process, and moreover, the hyper-parameter can be obtained and the feasibility of the algorithm is verified through an off-line simulation experiment. Finally, a quasi-periodic kernel function is selected, and hyper-parameters are solved by utilizing a conjugation gradient method, and themodel prediction on the respiratory movement data through a Gaussian process regression method. According to the method for predicting the human body thoracico-abdominal surface area respiratory movement in radiotherapy, the influence of the respiratory movement on the radiotherapy precision can be reduced.

Description

technical field [0001] The invention discloses a method for predicting respiratory motion in the surface area of ​​the chest and abdomen of a human body during radiotherapy, which belongs to the technical field of respiratory motion prediction. Background technique [0002] Respiratory movement will cause the tumor and normal tissue to move at a certain frequency and amplitude, which will cause the difference between the actual absorbed dose in radiotherapy and the calculation result of the planning system, affect the treatment effect, and even cause radiotherapy damage to the human body. Respiratory movement during radiotherapy is the main reason for the subsequent positional movement and volume change of thoracic and abdominal tumors, which will aggravate the phenomenon of missed irradiation of the target area and increased irradiation of normal tissues, and the respiration movement will cause tumor deformation and movement, resulting in actual The difference between the a...

AI Technical Summary

Problems solved by technology

[0003] At present, the conventional methods for dealing with respiratory movement in radiotherapy include: exercise inclusion method, compressed shallow breathing method, breath-holding method and respiratory gating method, etc., which have had a positive effect on radiotherapy for thoracic and abdominal tumors. Due to poor acceptability, low treatment efficiency, and relatively large damage to normal tissues, it is far from achieving the desired effect.

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