Filters








4,984 Hits in 7.3 sec

A comparison of three fiber tract delineation methods and their impact on white matter analysis

Valerie J. Sydnor, Ana María Rivas-Grajales, Amanda E. Lyall, Fan Zhang, Sylvain Bouix, Sarina Karmacharya, Martha E. Shenton, Carl-Fredrik Westin, Nikos Makris, Demian Wassermann, Lauren J. O'Donnell, Marek Kubicki
2018 NeuroImage  
Here we conduct a comparison of three representative and conceptually distinct approaches to fiber tract delineation: 1) a manual multiple region of interest-based approach, 2) an atlas-based approach,  ...  , insufficient attention has been paid to comparing post-tractography methods that extract white matter fiber tracts of interest from whole-brain tractography.  ...  to LO and FZ, P41EB015902 to LO and FZ, R01MH074794 to LO and FZ, and P41EB015898 to LO and FZ) and a European Research Council Starting Grant (ERC-StG NeuroLang to DW).  ... 
doi:10.1016/j.neuroimage.2018.05.044 pmid:29787865 pmcid:PMC6481642 fatcat:mhsnp6smw5e7fdq2mpk5hil5ya

Comparison of seeding methods for visualization of the corticospinal tracts using single tensor tractography

Alireza Radmanesh, Amir A. Zamani, Stephen Whalen, Yanmei Tie, Ralph O. Suarez, Alexandra J. Golby
2015 Clinical neurology and neurosurgery (Dutch-Flemish ed. Print)  
For each subject, we used five different seeding methods, from (1)cerebral peduncle (CP), (2)posterior limb of the internal capsule (PLIC), (3)white matter subjacent to functional MRI activations (fMRI  ...  WBF-CP delineated hand motor tracts in a larger proportion of trials than CP alone (p<0.05). Similarly, WBF-PLIC depicted hand motor tracts in a larger proportion of trials than PLIC alone (p< 0.01).  ...  Acknowledgements We would like to thank Isaiah Norton, Lauren O'Donnell, and Sharon Peled for their scientific contributions throughout this work.  ... 
doi:10.1016/j.clineuro.2014.11.021 pmid:25532134 pmcid:PMC4298470 fatcat:zml4iubqvvanrfqkuei4tkau5i

Fiber clustering versus the parcellation-based connectome

Lauren J. O'Donnell, Alexandra J. Golby, Carl-Fredrik Westin
2013 NeuroImage  
From the perspective of white matter segmentation, we compare and contrast the goals and methods of the parcellation-based and clustering approaches, with special focus on reviewing the field of fiber  ...  Fiber clustering is designed to reconstruct anatomically-defined white matter tracts, while the parcellation-based white matter segmentation enables the study of the brain as a network.  ...  Acknowledgments We gratefully acknowledge the following NIH grants: R01 MH074794, R21 CA156943, P41 EB015902 and P41 RR019703.  ... 
doi:10.1016/j.neuroimage.2013.04.066 pmid:23631987 pmcid:PMC3731058 fatcat:6altsrmd4zagzpymyigz5jp3ve

Improved Delineation of Short Cortical Association Fibers and Gray/White Matter Boundary Using Whole-Brain Three-Dimensional Diffusion Tensor Imaging at Submillimeter Spatial Resolution

Allen W. Song, Hing-Chiu Chang, Christopher Petty, Arnaud Guidon, Nan-Kuei Chen
2014 Brain Connectivity  
It was found that the delineation of short cortical association fibers is drastically improved as well as the definition of fiber pathway endings into the gray/white matter boundary-both of which will  ...  Recent emergence of human connectome imaging has led to a high demand on angular and spatial resolutions for diffusion magnetic resonance imaging (MRI).  ...  To further evaluate the benefit of a high spatial resolution on delineating the shortest intracortical fiber pathways within the gray matter and improving the gray/white matter boundary definition, the  ... 
doi:10.1089/brain.2014.0270 pmid:25264168 pmcid:PMC4238254 fatcat:tck5lqd6u5gb7fvkiljdtexoly

Towards a comprehensive delineation of white matter tract-related deformation [article]

Zhou Zhou, Xiaogai Li, Yuzhe Liu, Madelen Fahlstedt, Marios Georgiadis, Xianghao Zhan, Samuel J. Raymond, Gerald Grant, Svein Kleiven, David Camarillo, Michael Zeineh
2021 bioRxiv   pre-print
Thus, the present study performed a theoretical strain analysis to comprehensively characterize the WM fiber tract deformation by relating the strain tensor of the WM element to its embedded fiber tracts  ...  partially analyzed thus far.A theoretical derivation that comprehensively characterizes white matter tract-related deformation is conducted.Analytical formulas of three novel tract-related strains are  ...  MASS The peak of shear strain along the white matter fiber tracts across the entire simulation.  ... 
doi:10.1101/2021.04.13.439136 fatcat:3pxrfseznvdaloflq77nbafaoq

Establishing the reproducibility of two approaches to quantify white matter tract integrity in stroke

Michael R. Borich, Katie P. Wadden, Lara A. Boyd
2012 NeuroImage  
Fiber tract reconstruction using tract-based techniques and cross-sectional region of interest delineation are two common approaches to quantify white matter integrity.  ...  Results suggest both tract-based and cross-sectional approaches to evaluate white matter tract integrity are reliable, can differentiate between groups of stroke and healthy participants, and are associated  ...  This tract-based method to reconstruct a desired fiber tract utilizes an algorithm to group pixels based on their tensor properties; in turn this approach allows a given tract to be delineated and tract  ... 
doi:10.1016/j.neuroimage.2011.09.009 pmid:21945470 pmcid:PMC3249015 fatcat:paprsd4otbfz5agwuhuquch3zm

Automated delineation of white matter fiber tracts with a multiple region-of-interest approach

Ralph O. Suarez, Olivier Commowick, Sanjay P. Prabhu, Simon K. Warfield
2012 NeuroImage  
In a study of 20 healthy volunteers, we compared three methodologies for automated delineation of the white matter fiber bundles.  ...  Manual identification of anatomical MROI enables the delineation of white matter fiber bundles, but requires considerable training to develop expertise, considerable time to carry out and suffers from  ...  Acknowledgments This investigation was supported in part by National Institutes of Health grants R01 RR021885, R01 EB008015, R03 EB008680, R01 LM010033, and by a pilot grant from The National Multiple  ... 
doi:10.1016/j.neuroimage.2011.11.043 pmid:22155046 pmcid:PMC3302580 fatcat:m7c7eejwibawdngvls2pppenly

Regional vulnerability of longitudinal cortical association connectivity

Rafael Ceschin, Vince K. Lee, Vince Schmithorst, Ashok Panigrahy
2015 NeuroImage: Clinical  
Despite mean tract analysis, Tract-Based Spatial Statistics (TBSS) and voxel-based morphometry (VBM) demonstrating diffusely reduced fractional anisotropy (FA) reduction in all white matter tracts, the  ...  along-tract analysis improved the detection of regional tract vulnerability.  ...  Acknowledgments This work was supported by the National Institutes of Health (K23NS063371; P01NS019632), NLM grant 5T15LM007059-27, the Children3s Hospital of Pittsburgh Foundation -Harrison Family Fund  ... 
doi:10.1016/j.nicl.2015.08.021 pmid:26509119 pmcid:PMC4588423 fatcat:s2afwkn6dzci5lgbb3qoyyhr7q

Diffusion Tensor Imaging Tractography of White Matter Tracts in the Equine Brain

Samuel Boucher, Germain Arribarat, Benjamin Cartiaux, Elodie Anne Lallemand, Patrice Péran, Alexandra Deviers, Giovanni Mogicato
2020 Frontiers in Veterinary Science  
Association, commissural, and projection fibers, the three fiber groups typically investigated in tractography studies, were successfully reconstructed and overlaid on SWI or fractional anisotropy maps  ...  Our results demonstrate the feasibility of using postmortem DTI data to reconstruct the main white matter tracts of the equine brain.  ...  The process of fiber tracking, called tractography, allows for a virtual dissection and three-dimensional representation of white matter tracts (2) .  ... 
doi:10.3389/fvets.2020.00382 pmid:32850994 pmcid:PMC7406683 fatcat:to53zr2zara6bodb3rrhsbhgh4

Investigating the Capability to Resolve Complex White Matter Structures with High b-Value Diffusion Magnetic Resonance Imaging on the MGH-USC Connectom Scanner

Qiuyun Fan, Aapo Nummenmaa, Thomas Witzel, Roberta Zanzonico, Boris Keil, Stephen Cauley, Jonathan R. Polimeni, Dylan Tisdall, Koene R.A. Van Dijk, Randy L. Buckner, Van J. Wedeen, Bruce R. Rosen (+1 others)
2014 Brain Connectivity  
One of the major goals of the NIH Blueprint Human Connectome Project was to map and quantify the white matter connections in the brain using diffusion tractography.  ...  Crossing structures were detected in an increasingly larger fraction of white matter voxels and the spatial distribution of two-way and three-way crossing structures was largely consistent with known anatomy  ...  Acknowledgments The work is supported by the funding from the National Institutes of Health, NIH Blueprint Initiative for Neuroscience Research grant U01MH093765, NIH NIBIB grant K99EB015445, and the Instrumentation  ... 
doi:10.1089/brain.2014.0305 pmid:25287963 pmcid:PMC4238244 fatcat:kmcv3l2varhdtmvjsq7btjpy7a

Page 1886 of The Journal of Neuroscience Vol. 25, Issue 8 [page]

2005 The Journal of Neuroscience  
The wDTI portrayed white matter tracts as bright structures (high tissue diffusion anisotropy) with intrinsic orientation tangential to the trajectories of axonal fibers.  ...  Third, bcl-x deficiency caused several white matter tracts that were already formed by PO to undergo a marked reduction by P7.  ... 

Direct segmentation of the major white matter tracts in diffusion tensor images

Pierre-Louis Bazin, Chuyang Ye, John A. Bogovic, Navid Shiee, Daniel S. Reich, Jerry L. Prince, Dzung L. Pham
2011 NeuroImage  
The approach provides a direct voxel labeling, models explicitly fiber crossings and can handle white matter lesions.  ...  We present in this paper a fully automated method to extract many anatomical tracts at once on diffusion tensor images, based on a Markov random field model and anatomical priors.  ...  We measured average fractional anisotropy (FA) and volume for the tracts, two measures of interest when assessing the impact of lesions on white matter.  ... 
doi:10.1016/j.neuroimage.2011.06.020 pmid:21718790 pmcid:PMC3159825 fatcat:wvlkjxer7vauhfn6fdpizvbgja

Automated detection of white matter fiber bundles

Ralph O. Suarez, Olivier Commowick, Xavier Tomas-Fernandez, Sanjay Prabhu, Simon K. Warfield
2011 2011 IEEE International Symposium on Biomedical Imaging: From Nano to Macro  
White matter (WM) fiber bundles of the brain can be delineated by diffusion tractography utilizing anatomical regions-of-interest (ROI).  ...  We developed and compared three techniques for automated delineation of ROIs for the detection of two major WM fiber tracts in 12 healthy subjects.  ...  Subject-level results All three of the automated segmentation methods we designed were able to delineate CC and CST fiber bundles in 12 out of the 12 study participants, Jaccard's Similarly Indices of  ... 
doi:10.1109/isbi.2011.5872536 dblp:conf/isbi/SuarezCTPW11 fatcat:p27p7fbggnek5aq7yexte5ku2e

Age-related deficits in fronto-temporal connections in schizophrenia: A diffusion tensor imaging study

G ROSENBERGER, M KUBICKI, P NESTOR, E CONNOR, G BUSHELL, D MARKANT, M NIZNIKIEWICZ, C WESTIN, R KIKINIS, A JSAYKIN
2008 Schizophrenia Research  
Objective: Impairment of white matter connecting frontal and temporal cortices has been reported in schizophrenia.  ...  Fractional anisotropy (FA), describing fiber integrity, was then calculated along the entire length of these tracts, and correlated with subjects' age.  ...  Additionally, we gratefully acknowledge the support, in part, by grants from the National Institutes of Health (R03 MH068464-01 to MK, K02 K05 MH070047 and R01 MH 50747 to  ... 
doi:10.1016/j.schres.2008.04.019 pmid:18504117 pmcid:PMC2684860 fatcat:lzb5su3sjbfc5o66ucoxdxclum

Current contribution of diffusion tensor imaging in the evaluation of diffuse axonal injury

Daphine Centola Grassi, David Macedo da Conceição, Claudia da Costa Leite, Celi Santos Andrade
2018 Arquivos de Neuro-Psiquiatria  
Herein, we aim to review the current contribution of diverse state-of-the-art DTI analytical methods to the understanding of diffuse axonal injury pathophysiology and prognosis, to serve as a quick reference  ...  In such scenarios, diffuse tensor imaging (DTI) plays an important role because it provides further information on white matter integrity that is not obtained with standard magnetic resonance imaging sequences  ...  For this reason, probabilistic tractography tends to disperse trajectories more than deterministic methods and has the potential to delineate a greater proportion of the white matter tract 28, 29, 39,  ... 
doi:10.1590/0004-282x20180007 pmid:29809237 fatcat:ougge5n3z5dhrpzwwdvevmllau
« Previous Showing results 1 — 15 out of 4,984 results