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arXiv 1808.08296cs.CVcs.AIq-bio.NC
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使用深度学习和fMRI在ASD中进行脑生物标志物解释

Brain Biomarker Interpretation in ASD Using Deep Learning and fMRI

Yale University(耶鲁大学);Yale School of Medicine(耶鲁医学院)

Xiaoxiao Li, Nicha C. Dvornek, Juntang Zhuang, Pamela Ventola, James S. Duncan

摘要:

自闭症谱系障碍(ASD)是一种复杂的神经发育障碍。寻找与ASD相关的生物标志物对于了解疾病的根本原因非常有帮助,可以导致早期诊断和更有针对性的治疗。虽然深度神经网络(DNN)已被应用于功能性磁共振成像(fMRI)来识别ASD,但以前尚未探索过理解数据驱动的计算决策过程。因此,在这项工作中,我们解决了与识别ASD相关的可靠生物标志物的解释问题;具体来说,我们提出了一个2阶段的方法,使用fMRI图像对ASD和对照受试者进行分类,并解释由分类器激活的显着特征。首先,我们训练了一个准确的DNN分类器。然后,针对生物标记物的检测,不同于计算机视觉中的DNN可视化工作,我们利用脑功能磁共振成像的解剖结构,提出了一种频率归一化的采样方法来破坏图像。此外,在ASD与对照受试者分类方案中,我们提供了一种新的方法来检测和表征重要的大脑特征分为三类。我们发现的生物标志物所提出的方法是强大的,并与文献中以前的发现一致。我们还通过神经功能解码并与DNN激活图进行比较来验证检测到的生物标志物。

英文摘要:

Autism spectrum disorder (ASD) is a complex neurodevelopmental disorder. Finding the biomarkers associated with ASD is extremely helpful to understand the underlying roots of the disorder and can lead to earlier diagnosis and more targeted treatment. Although Deep Neural Networks (DNNs) have been applied in functional magnetic resonance imaging (fMRI) to identify ASD, understanding the data-driven computational decision making procedure has not been previously explored. Therefore, in this work, we address the problem of interpreting reliable biomarkers associated with identifying ASD; specifically, we propose a 2-stage method that classifies ASD and control subjects using fMRI images and interprets the saliency features activated by the classifier. First, we trained an accurate DNN classifier. Then, for detecting the biomarkers, different from the DNN visualization works in computer vision, we take advantage of the anatomical structure of brain fMRI and develop a frequency-normalized sampling method to corrupt images. Furthermore, in the ASD vs. control subjects classification scenario, we provide a new approach to detect and characterize important brain features into three categories. The biomarkers we found by the proposed method are robust and consistent with previous findings in the literature. We also validate the detected biomarkers by neurological function decoding and comparing with the DNN activation maps.

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。

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