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基于机器学习的BNCT放疗剂量预测研究

Study of BNCT Dose Prediction Based on Machine Learning

  • 摘要: 硼剂量在硼中子俘获治疗(BNCT)总剂量中占比超过70%,是杀伤肿瘤的关键因素。在治疗过程中,实时、快速获取靶区硼剂量的分布信息对于精准评估疗效具有重要意义。本文采用机器学习方法,结合不同肿瘤位置特征以及硼浓度分布特征,实现对靶区硼剂量的精准预测。基于具有中国人生理特征的辐射仿真人体模型,构建20例脑胶质瘤病例样本,采用蒙特卡罗方法模拟计算枕部正后照射方案下的样本硼剂量分布。将数据集划分为80%的训练集和20%的验证集,并基于多种机器学习算法(MLP、RF、LightGBM、CatBoost、XGBoost、SVM、GRU及Stacking模型)进行训练构建剂量预测模型。通过MSE、MAE、RMSE、RAE、MAPE、PCC及R2系列指标来评价模型的拟合效果和预测能力。结果表明,在处理复杂肿瘤结构的硼剂量预测任务中,Stacking模型在所有评估指标上均表现最佳,MAPE的值小于5%满足临床要求,R2值达到了0.9813,MSE低至0.0667,预测效果优于其他模型。本文初步验证了机器学习在BNCT剂量预测中的可行性,为提高BNCT治疗效果和剂量评估的精准性提供了重要参考依据。

     

    Abstract: Boron dose accounts for over 70% of the total dose in boron neutron capture therapy (BNCT), serving as a critical factor in tumor eradication. Real-time and rapid acquisition of boron dose distribution in the target region during treatment is of paramount importance for accurately assessing therapeutic efficacy. This study employs machine learning techniques, integrating features of tumor location and boron concentration distribution, to achieve precise prediction of boron dose in the target area. Based on a radiation simulation human model with Chinese physiological characteristics, 20 brain glioma case samples were constructed. The Monte Carlo method was utilized to simulate the boron dose distribution under a posterior occipital irradiation scheme. The dataset was split into 80% training set and 20% validation set, and multiple machine learning algorithms (MLP, RF, LightGBM, CatBoost, XGBoost, SVM, GRU, and Stacking models) were applied to train and develop dose prediction models. Model fitting and predictive performance were evaluated using a series of metrics, including MSE, MAE, RMSE, RAE, MAPE, PCC, and R2. Results demonstrate that, in the task of predicting boron dose for complex tumor structures, the Stacking model outperforms others across all evaluation metrics, achieving an MAPE below 5% (meeting clinical requirements), an R2 of 0.9813, and an MSE as low as 0.0667, surpassing the predictive accuracy of other models. This study preliminarily validates the feasibility of machine learning in BNCT dose prediction, providing significant reference value for enhancing therapeutic outcomes and improving the precision of dose assessment in BNCT.

     

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