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Clustering of Whole-Brain White Matter Short Association Bundles Using HARDI Data

Claudio Román, Miguel Guevara, Ronald Valenzuela, Miguel Figueroa, Josselin Houenou, Delphine Duclap, Cyril Poupon, Jean-François Mangin, Pamela Guevara
2017 Frontiers in Neuroinformatics  
The database can be requested from cyril.poupon@cea. fr and will be available from the Human Brain Project in a near future.  ...  In he study by Pardo et al. (2013) , the authors applied the same method to a HARDI database of 30 subjects (Schmitt et al., 2012) , studying the variability of the obtained bundles.  ...  On the other hand, few studies about short association bundles of superficial white matter (SWM) exist.  ... 
doi:10.3389/fninf.2017.00073 pmid:29311886 pmcid:PMC5744462 fatcat:xf3ehgs2hncjbklmkqyc372rki

Segmentation of Short Association Bundles in Massive Tractography Datasets Using a Multi-subject Bundle Atlas [chapter]

Pamela Guevara, Delphine Duclap, Cyril Poupon, Linda Marrakchi-Kacem, Josselin Houenou, Marion Leboyer, Jean-François Mangin
2011 Lecture Notes in Computer Science  
An atlas of 47 bundles is inferred from a first database of 12 brains, and used to segment the same bundles in a second database of 10 brains.  ...  This paper presents a method for automatic segmentation of some short association fiber bundles from massive dMRI tractography datasets.  ...  This is due in part to the high inter-subject variability of short association SWM bundles and the current limitations of dMRI techniques.  ... 
doi:10.1007/978-3-642-25085-9_83 fatcat:ygne5rvcnvebja4lqyjnixxsp4

Superficial white matter: A review on the dMRI analysis methods and applications

Miguel Guevara, Pamela Guevara, Claudio Román, Jean-François Mangin
2020 NeuroImage  
The shape and localization of these short bundles present a high variability across subjects.  ...  The mapping of human brain connections is still an on going task.  ...  Those works showed the existence of the short association bundles in the regions they studied.  ... 
doi:10.1016/j.neuroimage.2020.116673 pmid:32114152 fatcat:onw3cxzkvzau7lng54dtgzlwga

Automatic group-wise whole-brain short association fiber bundle labeling based on clustering and cortical surface information

Andrea Vázquez, Narciso López-López, Josselin Houenou, Cyril Poupon, Jean-François Mangin, Susana Ladra, Pamela Guevara
2020 BioMedical Engineering OnLine  
We present an automatic method for labeling of short association bundles on a group of subjects. The method is based on an intra-subject fiber clustering that generates compact fiber clusters.  ...  We implemented a method for the automatic labeling of short bundles in individuals, based on an intra-subject clustering and the connectivity of the clusters with the cortex.  ...  Hence, there is still a need for methods, open to the research community for the study of short association bundles in new databases.  ... 
doi:10.1186/s12938-020-00786-z pmid:32493483 fatcat:hapmy6vbe5ajlhs2luo4iua3gu

Parallel Optimization of Fiber Bundle Segmentation for Massive Tractography Datasets

Andrea Vazquez, Narciso Lopez-Lopez, Nicole Labra, Miguel Figueroa, Cyril Poupon, Jean-Francois Mangin, Cecilia Hernandez, Pamela Guevara
2019 2019 IEEE 16th International Symposium on Biomedical Imaging (ISBI 2019)  
We present an optimized algorithm that performs automatic classification of white matter fibers based on a multi-subject bundle atlas.  ...  In addition, the new algorithm reduces the memory consumption of the previous version by a factor of 0.79.  ...  Valenzuela, et al., “Clustering matter fibers, based on probabilistic tractography, which can of whole-brain white matter short association bundles using  ... 
doi:10.1109/isbi.2019.8759208 dblp:conf/isbi/VazquezLLFPMHG19 fatcat:46zgug3yc5dithw34epr7by7qm

From Coarse to Fine-Grained Parcellation of the Cortical Surface Using a Fiber-Bundle Atlas

Narciso López-López, Andrea Vázquez, Josselin Houenou, Cyril Poupon, Jean-François Mangin, Susana Ladra, Pamela Guevara
2020 Frontiers in Neuroinformatics  
Generating parcels from segmented fiber bundles can provide a good representation of the human brain connectome since they are based on bundle atlases that contain the most reproducible short and long  ...  The method first processes the tractography of each subject and extracts the bundles of the atlas, based on a segmentation algorithm.  ...  The method was applied to a group of 79 subjects from a HARDI database. Several quantitative and qualitative evaluations were performed.  ... 
doi:10.3389/fninf.2020.00032 pmid:33071768 pmcid:PMC7533645 fatcat:zqa3xfyu65gc7mzq4hzt6fcgli

Longitudinal Changes in Diffusion Properties in White Matter Pathways of Children With Tuberous Sclerosis Complex

Fiona M. Baumer, Jae W. Song, Paul D. Mitchell, Rudolph Pienaar, Mustafa Sahin, P. Ellen Grant, Emi Takahashi
2015 Pediatric Neurology  
The purpose of this study is to identify predictors of longitudinal changes in diffusion properties of white matter tracts in patients with TSC.  ...  associated with poorer neurocognitive outcomes.  ...  A limitation of the study is the short interval (approximately 1 year) between MRI scans for these TSC subjects.  ... 
doi:10.1016/j.pediatrneurol.2015.02.004 pmid:25817702 pmcid:PMC4442035 fatcat:uzcib6tnsjbhnpbzg7ybwosja4

Cortical surface parcellation based on intra-subject white matter fiber clustering [article]

Narciso López-López, Andrea Vázquez, Cyril Poupon, Jean-François Mangin, Pamela Guevara
2020 arXiv   pre-print
We present a hybrid method that performs the complete parcellation of the cerebral cortex of an individual, based on the connectivity information of the white matter fibers from a whole-brain tractography  ...  Results in five subjects from ARCHI database show a good individual cortical parcellation for each one, composed of about 200 subparcels per hemisphere and complying with these connectivity measures.  ...  In addition, short association fiber connections can be lost due to the limited resolution of the tractographic methods [11] .  ... 
arXiv:2002.09034v1 fatcat:m5534eypkvb4zmde7rpgepftau

Robust clustering of massive tractography datasets

P. Guevara, C. Poupon, D. Rivière, Y. Cointepas, M. Descoteaux, B. Thirion, J.-F. Mangin
2011 NeuroImage  
The resulting regions of interest are used to define subset of fibers that are subdivided further into consistent bundles using a clustering of the fiber extremities.  ...  The dataset is reduced from more than one million fiber tracts to about two thousand fiber bundles. Validations are provided using simulated data and a physical phantom.  ...  Most of these bundles belong to short association fiber tracts, like U fibers. An exterior and interior view of a group of long fiber bundles (130-150 mm) is shown in Figure 8 (C).  ... 
doi:10.1016/j.neuroimage.2010.10.028 pmid:20965259 fatcat:kockuz3zezexrjmp7r263uvu54

New DMSP database of precipitating auroral electrons and ions

Robert J. Redmon, William F. Denig, Liam M. Kilcommons, Delores J. Knipp
2017 Journal of Geophysical Research - Space Physics  
We describe how the new database is being applied to high latitude studies of: the colocation of kinetic and electromagnetic energy inputs, ionospheric conductivity variability, field aligned currents  ...  We anticipate that this new database will support a broad range of space science endeavors from single observatory studies to coordinated system science investigations.  ...  Acknowledgments The contributors to the new DMSP SSJ dataset are numerous and the key individuals the authors wish to thank include Fred Rich (MITLL, AFRL retired), Daniel Ober and Gordon Wilson (AFRL)  ... 
doi:10.1002/2016ja023339 pmid:28966897 pmcid:PMC5619259 fatcat:hrcrn5leuvacbel7plcksisdbq

Aquaporin 11 variant associates with kidney disease in type 2 diabetic patients

David P. Choma, Roberto Vanacore, Helen Naylor, Ian A. Zimmerman, Andrei Pavlichenko, Artyom Pavlichenko, Liberty Foye, David P. Carbone, Raymond C. Harris, Mikhail M. Dikov, Elena E. Tchekneva
2016 AJP - Renal Physiology  
Table 3 . 3 Risk of AKI or CKD associated with the minor allele in study I subjectsMultivariable logistic regression analysis was performed on independent variables including age, sex, baseline serum creatinine  ...  Logistic regression, in which a dichotomous outcome (kidney disease Ϫ or kidney disease ϩ) was regressed on independent variables (see Covariates of interest), generated the coefficients of a prediction  ... 
doi:10.1152/ajprenal.00295.2015 pmid:26719361 pmcid:PMC4773830 fatcat:kzkmws3onrghxgda7zeqitlld4

Does the A9285g Polymorphism in Collagen Type XII α1 Gene Associate with the Risk of Anterior Cruciate Ligament Ruptures?

Ficek K., Stepien-Slodkowska M., Kaczmarczyk M., Maciejewska-Karlowska A., Sawczuk M., Cholewinski J., Leonska-Duniec A., Zarebska A., Cieszczyk P., Zmijewski P.
2014 Balkan Journal of Medical Genetics  
One of the most severe injuries sustained by athletes is rupture of the anterior cruciate ligament (ACL).  ...  However, these conclusions should be supported with more experimental studies on COL12A1 polymorphisms.  ...  The last of these is a key component due to the variability of inciting events among different disciplines.  ... 
doi:10.2478/bjmg-2014-0022 pmid:25741214 pmcid:PMC4347476 fatcat:lyycqq4rufh63bd64s5mvn3bwi

The Impact of Information and Communication Technology (ICT) Development on Economic Growth in Sudan: An Application of ARDL Bounds Testing Approach

Ahmed Mohammed Khater
2017 Archives of Business Research  
The aim of this study to investigates the impact of Information and Communication Technology (ICT) development on economic growth in Sudan.  ...  The short run dynamic model also reveals that the speed of convergence to equilibrium is moderate implying that there is a short run relationship between ICT and economic growth.  ...  Hardy (1980) is one of the first studies we are aware of that investigates the potential impact of telecommunication on growth.  ... 
doi:10.14738/abr.53.2886 fatcat:vb3ckqltinfnbisa4v4vd7pmxm

Genetic Variants Associated With Atrial Fibrillation and PR Interval Following Cardiac Surgery

Martin I. Sigurdsson, Jochen D. Muehlschlegel, Amanda A. Fox, Mahyar Heydarpour, Peter Lichtner, Thomas Meitinger, Charles D. Collard, Stanton K. Shernan, Simon C. Body
2015 Journal of Cardiothoracic and Vascular Anesthesia  
Measurements and Main Results-The incidence of new-onset poAF was 31%. All of the PR interval variables were longer in the poAF cohort.  ...  Two variants on 1q21 and 12 on 4q25 were associated with poAF after adjustment for false discovery rate (FDR), but no variants were associated with PR interval variables after adjustment for FDR.  ...  Acknowledgments Supported by grants from the National Heart, Lung, and Blood Institute (HL65962, HL068774, and HL092217).  ... 
doi:10.1053/j.jvca.2014.10.028 pmid:26009287 pmcid:PMC5103707 fatcat:gh5rm7nvi5avfj2wvn54yury7u

A panel of clinical and neuropathological features of cerebrovascular disease through the novel neuroimaging methods

Gilberto Sousa Alves, Luiza de Amorim de Carvalho, Felipe Kenji Sudo, Lucas Briand, Jerson Laks, Eliasz Engelhardt
2017 Dementia & Neuropsychologia  
Advanced neuroimaging methods not only provide a strategic contribution for the differential diagnosis of vascular dementia (VaD) and vascular cognitive impairment (VCI), but also help elucidate the pathophysiological  ...  Objective: In this review, the novel imaging methods, both structural and metabolic, were summarized and their impact on the diagnostic workup of age-related CVD was analysed.  ...  , an indirect measure of the molecule direction in a given set of fibers and bundles of a brain structure. 72, 73, 76 An increasing body of evidence has demonstrated an association of WM microstructural  ... 
doi:10.1590/1980-57642016dn11-040003 pmid:29354214 pmcid:PMC5769992 fatcat:wqezepqjnbbvrc5iqmvdequpd4
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