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arXiv 2302.05451cs.LGcs.CE
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基于fMRI和DTI数据的脑效应连接组:贝叶斯因果学习与评估

Brain Effective Connectome based on fMRI and DTI Data: Bayesian Causal Learning and Assessment

University of Tehran(德黑兰大学);Harvard Medical School(哈佛医学院)

Abdolmahdi Bagheri, Mahdi Dehshiri, Yamin Bagheri, Alireza Akhondi-Asl, Babak Nadjar Araabi

AI总结:

针对fMRI数据样本量小、分辨率低及脑连接组高维导致的效应连接组发现效果受限问题,提出融合DTI先验的两种贝叶斯因果发现框架,经模拟与HCP数据验证,在准确性和可重复性上均优于传统方法。

摘要:

神经科学研究旨在寻找准确可靠的脑效应连接组(Effective Connectome,EC)。尽管当前的EC发现方法已帮助我们理解脑组织结构,但其性能受到fMRI数据样本量小、时间分辨率低以及脑连接组高维性的严重限制。\n通过将DTI数据作为先验知识加以利用,我们提出了两种贝叶斯因果发现框架——Bayesian GOLEM(BGOLEM)和Bayesian FGES(BFGES)方法,它们能生成显著更准确可靠的EC,并解决了现有因果发现方法仅基于fMRI数据发现EC时存在的缺陷。\n通过在合成数据和混合数据(人类连接组计划(Human Connectome Project,HCP)受试者的DTI数据与合成fMRI数据)上开展的一系列模拟研究,我们证明了所提方法在发现EC方面的有效性。为了在实证数据上量化评估我们的方法提升EC准确性的程度,我们首先提出伪错误发现率(Pseudo False Discovery Rate,PFDR),作为脑内因果发现的一种全新计算准确率指标。我们证明了在HCP数据上,我们的贝叶斯方法比传统方法实现了更高的准确率。此外,我们使用Rogers-Tanimoto指数针对重测数据衡量所发现EC的可靠性,结果表明我们的贝叶斯方法生成的EC可重复性显著高于传统方法。\n总体而言,本研究的数值和图形结果凸显了这些框架在大幅推进我们对脑功能和组织结构理解方面的潜力。

英文摘要:

Neuroscientific studies aim to find an accurate and reliable brain Effective Connectome (EC). Although current EC discovery methods have contributed to our understanding of brain organization, their performances are severely constrained by the short sample size and poor temporal resolution of fMRI data, and high dimensionality of the brain connectome. By leveraging the DTI data as prior knowledge, we introduce two Bayesian causal discovery frameworks -- the Bayesian GOLEM (BGOLEM) and Bayesian FGES (BFGES) methods -- that offer significantly more accurate and reliable ECs and address the shortcomings of the existing causal discovery methods in discovering ECs based on only fMRI data. Through a series of simulation studies on synthetic and hybrid (DTI of the Human Connectome Project (HCP) subjects and synthetic fMRI) data, we demonstrate the effectiveness of the proposed methods in discovering EC. To numerically assess the improvement in the accuracy of ECs with our method on empirical data, we first introduce the Pseudo False Discovery Rate (PFDR) as a new computational accuracy metric for causal discovery in the brain. We show that our Bayesian methods achieve higher accuracy than traditional methods on HCP data. Additionally, we measure the reliability of discovered ECs using the Rogers-Tanimoto index for test-retest data and show that our Bayesian methods provide significantly more reproducible ECs than traditional methods. Overall, our study's numerical and graphical results highlight the potential for these frameworks to advance our understanding of brain function and organization significantly.

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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