A New Adaptive Sliding Window Method for fMRI Dynamic Functional Connectivity Analysis

IF 3 4区 计算机科学 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC
Ningfei Jiang, Yuhu Shi
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引用次数: 0

Abstract

The fixed-window sliding time window method is widely used in exploring dynamics functional connectivity of functional magnetic resonance imaging data analysis, but it is difficult to select a suitable window to capture the dynamic changes in brain function. Therefore, a local polynomial regression (LPR) method is proposed to fit the region of interest (ROI) time series in this paper, in which observations are locally modeled by a least-squares polynomial with a kernel of a certain bandwidth that allows for better bias-variance tradeoff. It combines a data-driven variable bandwidth selection mechanism with intersection of confidence intervals (ICI) and a bandwidth optimization algorithm of particle swarm optimization (PSO). Among them, ICI is used to adaptively determine the locally optimal bandwidth that minimizes the mean square error (MSE), and then the bandwidth values at various time points within all ROIs are computed for each subject. Subsequently, the averaged bandwidth values at these time points is regarded as the bandwidth value for that subject at each time point, followed by generating a time-varying bandwidth sequence for each subject, which is used in the PSO-based bandwidth optimization algorithm. Finally, the results of experiments conducted on simulated data showed that the LPR–ICI–PSO method exhibited lower MSE values on time-varying correlation coefficient estimation for different noise scenarios. Furthermore, we applied the proposed method to the autism spectrum disorder (ASD) study, and obtained a classification accuracy of 74.1% from typical controls (TC) through support vector machine (SVM) with the 10-fold cross-validation strategy. These results demonstrated that our proposed method can effectively capture the dynamic changes in brain function, which is valid in clinical diagnosis and helps to reveal the differences in brain functional connectivity patterns.

一种新的自适应滑动窗口方法用于fMRI动态功能连接分析
固定窗口滑动时间窗方法被广泛用于功能磁共振成像数据分析的动态功能连通性探索,但难以选择合适的窗口来捕捉脑功能的动态变化。因此,本文提出了一种局部多项式回归(LPR)方法来拟合感兴趣区域(ROI)时间序列,其中观测值由具有一定带宽核的最小二乘多项式局部建模,从而可以更好地进行偏差-方差权衡。该算法结合了数据驱动的交叉置信区间(ICI)可变带宽选择机制和粒子群优化算法(PSO)。其中,利用ICI自适应确定使均方误差(MSE)最小的局部最优带宽,然后计算每个受试者在所有roi内各时间点的带宽值。然后,将这些时间点的平均带宽值作为该被试在每个时间点的带宽值,生成每个被试的时变带宽序列,用于基于粒子群算法的带宽优化算法。最后,在模拟数据上进行的实验结果表明,LPR-ICI-PSO方法在不同噪声情景下的时变相关系数估计均具有较低的MSE值。此外,我们将该方法应用于自闭症谱系障碍(ASD)研究中,通过10倍交叉验证策略的支持向量机(SVM)从典型对照(TC)中获得了74.1%的分类准确率。这些结果表明,我们的方法可以有效地捕捉到脑功能的动态变化,在临床诊断中是有效的,有助于揭示脑功能连接模式的差异。
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来源期刊
International Journal of Imaging Systems and Technology
International Journal of Imaging Systems and Technology 工程技术-成像科学与照相技术
CiteScore
6.90
自引率
6.10%
发文量
138
审稿时长
3 months
期刊介绍: The International Journal of Imaging Systems and Technology (IMA) is a forum for the exchange of ideas and results relevant to imaging systems, including imaging physics and informatics. The journal covers all imaging modalities in humans and animals. IMA accepts technically sound and scientifically rigorous research in the interdisciplinary field of imaging, including relevant algorithmic research and hardware and software development, and their applications relevant to medical research. The journal provides a platform to publish original research in structural and functional imaging. The journal is also open to imaging studies of the human body and on animals that describe novel diagnostic imaging and analyses methods. Technical, theoretical, and clinical research in both normal and clinical populations is encouraged. Submissions describing methods, software, databases, replication studies as well as negative results are also considered. The scope of the journal includes, but is not limited to, the following in the context of biomedical research: Imaging and neuro-imaging modalities: structural MRI, functional MRI, PET, SPECT, CT, ultrasound, EEG, MEG, NIRS etc.; Neuromodulation and brain stimulation techniques such as TMS and tDCS; Software and hardware for imaging, especially related to human and animal health; Image segmentation in normal and clinical populations; Pattern analysis and classification using machine learning techniques; Computational modeling and analysis; Brain connectivity and connectomics; Systems-level characterization of brain function; Neural networks and neurorobotics; Computer vision, based on human/animal physiology; Brain-computer interface (BCI) technology; Big data, databasing and data mining.
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