Please use this identifier to cite or link to this item:
Title: A tutorial and tool for exploring feature similarity gradients with MRI data
Authors: Bajada, Claude J.
Costa Campos, Lucas Q.
Caspers, Svenja
Muscat, Richard
Parker, Geoffrey J. M.
Lambon Ralph, Matthew A.
Cloutman, Lauren L.
Rujillo-Barreto, Nelson J.
Keywords: Magnetic resonance imaging
Cerebral cortex
Brain -- Magnetic resonance imaging
Data structures (Computer science)
Dimension reduction (Statistics)
Issue Date: 2020
Publisher: Elsevier Ltd.
Citation: Bajada, C. J., Campos, L. Q. C., Caspers, S., Muscat, R., Parker, G. J., Ralph, M. A. L., ... & Trujillo-Barreto, N. J. (2020). A tutorial and tool for exploring feature similarity gradients with MRI data. NeuroImage, 117140.
Abstract: There has been an increasing interest in examining organisational principles of the cerebral cortex (and subcortical regions) using different MRI features such as structural or functional connectivity. Despite the widespread interest, introductory tutorials on the underlying technique targeted for the novice neuroimager are sparse in the literature. Articles that investigate various “neural gradients” (for example based on region studied “cortical gradients,” “cerebellar gradients,” “hippocampal gradients” etc … or feature of interest “functional gradients,” “cytoarchitectural gradients,” “myeloarchitectural gradients” etc…) have increased in popularity. Thus, we believe that it is opportune to discuss what is generally meant by “gradient analysis”. We introduce basics concepts in graph theory, such as graphs themselves, the degree matrix, and the adjacency matrix. We discuss how one can think about gradients of feature similarity (the similarity between timeseries in fMRI, or streamline in tractography) using graph theory and we extend this to explore such gradients across the whole MRI scale; from the voxel level to the whole brain level. We proceed to introduce a measure for quantifying the level of similarity in regions of interest. We propose the term “the Vogt-Bailey index” for such quantification to pay homage to our history as a brain mapping community. We run through the techniques on sample datasets including a brain MRI as an example of the application of the techniques on real data and we provide several appendices that expand upon details. To maximise intuition, the appendices contain a didactic example describing how one could use these techniques to solve a particularly pernicious problem that one may encounter at a wedding. Accompanying the article is a tool, available in both MATLAB and Python, that enables readers to perform the analysis described in this article on their own data. We refer readers to the graphical abstract as an overview of the analysis pipeline presented in this work.
Appears in Collections:Scholarly Works - FacM&SPB

Files in This Item:
File Description SizeFormat 
A_tutorial_and_tool_for_exploring_feature_similarity_gradients_with_MRI_data.pdf21.55 MBAdobe PDFView/Open

Items in OAR@UM are protected by copyright, with all rights reserved, unless otherwise indicated.