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arXiv 2406.16619cs.LGcs.NE
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基于随机卷积的广义动态脑功能连接

Generalized Dynamic Brain Functional Connectivity Based on Random Convolutions

Beijing Normal University(北京师范大学);TReNDS Center, Georgia State University(佐治亚州立大学TReNDS中心)

Yongjie Duan, Vince D. Calhoun, Zhiying Long

AI总结:

本文提出基于多维随机卷积的广义动态功能连接方法(RandCon),无需学习核权重即可捕获任意时间尺度的时变DFC,在模拟和真实fMRI数据上优于传统方法,且滑动窗口为其特例。

摘要:

动态功能连接(DFC)分析已被广泛应用于功能磁共振成像(fMRI)数据,以揭示脑状态随时间变化的动态变化。滑动窗口方法因其简单性而成为迄今为止最流行的DFC分析方法。然而,滑动窗口方法带有一些假设,即典型方法使用单一窗口,仅能捕获特定频率范围内的动态。在本研究中,我们提出了一种通过多维随机卷积(RandCon)DFC方法实现动态分析的广义方法,该方法通过使用多个多维随机卷积核从fMRI时间序列中提取不同的局部特征,无需学习核权重,即可有效捕获任意时间尺度上的时变DFC。与标准滑动窗口方法、时间导数乘法(MTD)和相位同步方法相比,具有最小核大小(3个时间点)的RandCon在模拟数据上的性能表现出显著改进,特别是在不同噪声水平下极短窗口/核大小下的DFC时间和空间估计方面。来自真实fMRI数据的结果表明,RandCon对性别差异比竞争方法更敏感。此外,我们表明滑动窗口方法可以被视为所提出的多维卷积框架的一个特例。所提出的方法简单且高效,显著拓宽了动态功能连接研究的范围,并具有理论和实践潜力。

英文摘要:

Dynamic functional connectivity (DFC) analysis has been widely applied to functional magnetic resonance imaging (fMRI) data to reveal time-varying dynamic changes of brain states. The sliding window method is by far the most popular DFC analysis method due to its simplicity. However, the sliding window method comes with some assumptions, namely the typically approach uses a single window which captures dynamics only within a specific frequency range. In this study, we propose a generalized approach to dynamics via a multi-dimensional random convolution (RandCon) DFC method that is able to effectively capture time-varying DFC at arbitrary time scales by extracting different local features from fMRI time series using a number of multi-dimensional random convolution kernels without the need for learning kernel weights. Compared to a standard sliding window method, multiplication of temporal derivatives (MTD) and phase synchrony methods, RandCon with the smallest kernel size (3 time points) showed notable improvements in performance on simulated data, particularly in terms of DFC temporal and spatial estimation in very short window/kernel size under different noise levels. Results from real fMRI data indicated that RandCon was more sensitive to gender differences than competing methods. Furthermore, we show that the sliding window method can be considered a special case of the proposed multi-dimensional convolution framework. The proposed method is simple and efficient significantly broadens the scope of dynamic functional connectivity research and offer theoretical and practical potential.

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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