用深度网络加速硼中子俘获治疗的剂量重建,实现治疗中的实时监控。
Deep convolutional framelets for dose reconstruction in BNCT with Compton camera detector
- 用深度卷积框架与U-Net处理康普顿相机图像,减少噪声和伪影。
- 在少量迭代下完成重建,时间远短于传统MLEM算法。
- 适合需要实时剂量反馈的精准放疗研究者与临床应用团队。
硼中子俘获治疗(BNCT)是一种基于10B(n,α)7Li中子俘获反应的新型二元放射疗法,通过在癌细胞中富集硼化合物,使高线性能量转移产物在细胞水平释放能量,从而选择性杀伤癌细胞。尽管基于加速器的BNCT技术已取得进展,但治疗过程中的在体剂量监测仍不可行,多种方法正在探索中。康普顿成像相较于其他成像方式具有优势,但通常重建耗时长,与BNCT治疗时间相当。本研究构建了深度神经网络模型,利用模拟的BNCT康普顿相机图像数据集估计剂量分布,旨在避免最大似然期望最大化算法(MLEM)的迭代耗时,实现治疗过程中的快速剂量重建。采用U-Net架构及两种基于深度卷积框架的变体,对少迭代重建图像进行降噪与伪影抑制,显著提升了重建精度与处理速度。
原文摘要 · Abstract (English)
Boron Neutron Capture Therapy (BNCT) is an innovative binary form of radiation therapy with high selectivity towards cancer tissue based on the neutron capture reaction 10B(n,$α$)7Li, consisting in the exposition of patients to neutron beams after administration of a boron compound with preferential accumulation in cancer cells. The high linear energy transfer products of the ensuing reaction deposit their energy at cell level, sparing normal tissue. Although progress in accelerator-based BNCT has led to renewed interest in this cancer treatment modality, in vivo dose monitoring during treatment still remains not feasible and several approaches are under investigation. While Compton imaging presents various advantages over other imaging methods, it typically requires long reconstruction times, comparable with BNCT treatment duration. This study aims to develop deep neural network models to estimate the dose distribution by using a simulated dataset of BNCT Compton camera images. The models pursue the avoidance of the iteration time associated with the maximum-likelihood expectation-maximization algorithm (MLEM), enabling a prompt dose reconstruction during the treatment. The U-Net architecture and two variants based on the deep convolutional framelets framework have been used for noise and artifacts reduction in few-iterations reconstructed images, leading to promising results in terms of reconstruction accuracy and processing time.
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