arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 2108.09423cs.LGeess.SP
收藏

增强特征表示的自适应无监督学习用于胶质母细胞瘤的肿瘤内分割和生存预测

Adaptive unsupervised learning with enhanced feature representation for intra-tumor partitioning and survival prediction for glioblastoma

University of Bath(巴斯大学);University of Cambridge(剑桥大学)

Yifan Li, Chao Li, Yiran Wei, Stephen Price, Carola-Bibiane Schönlieb, Xi Chen

摘要:

胶质母细胞瘤在局部微结构和血管系统方面具有深刻的异质性。描述胶质母细胞瘤的空间异质性可能会导致更精确的治疗。利用无监督学习技术,胶质母细胞瘤MRI衍生放射组学特征已被广泛用于肿瘤子区域分割和生存预测。然而,算法结果的可靠性经常受到模糊的中间过程和聚类算法的随机性引入的不稳定性的挑战,特别是对于来自异质患者的数据。在本文中,我们提出了一种自适应无监督学习方法,用于有效的MRI肿瘤内分区和胶质母细胞瘤生存预测。提出了一种新的、针对具体问题的神经网络增强的自动编码器(FAE),用于增强成对临床模式的表示,从而提高无监督学习算法(如K-means)的聚类稳定性。此外,整个过程是由贝叶斯优化(BO)技术建模与自定义损失函数的超参数可以自适应优化在一个合理的几个步骤。结果表明,所提出的方法可以产生强大的和临床相关的MRI子区域和统计上显着的生存预测。

英文摘要:

Glioblastoma is profoundly heterogeneous in regional microstructure and vasculature. Characterizing the spatial heterogeneity of glioblastoma could lead to more precise treatment. With unsupervised learning techniques, glioblastoma MRI-derived radiomic features have been widely utilized for tumor sub-region segmentation and survival prediction. However, the reliability of algorithm outcomes is often challenged by both ambiguous intermediate process and instability introduced by the randomness of clustering algorithms, especially for data from heterogeneous patients. In this paper, we propose an adaptive unsupervised learning approach for efficient MRI intra-tumor partitioning and glioblastoma survival prediction. A novel and problem-specific Feature-enhanced Auto-Encoder (FAE) is developed to enhance the representation of pairwise clinical modalities and therefore improve clustering stability of unsupervised learning algorithms such as K-means. Moreover, the entire process is modelled by the Bayesian optimization (BO) technique with a custom loss function that the hyper-parameters can be adaptively optimized in a reasonably few steps. The results demonstrate that the proposed approach can produce robust and clinically relevant MRI sub-regions and statistically significant survival predictions.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑