Filters








324 Hits in 7.5 sec

A comparison of distributional considerations with statistical analysis of resting state fMRI at 3T and 7T

Xue Yang, Martha J. Holmes, Allen T. Newton, Victoria L. Morgan, Bennett A. Landman, Sébastien Ourselin, David R. Haynor
2012 Medical Imaging 2012: Image Processing  
Traditional statistical parametric mapping theories based on distributional properties representative of data acquired at lower fields may be inadequate for new 7T data.  ...  and extreme values of kurtosis (a measure of non-Gaussianity).  ...  The kurtosis values are randomly distributed in both 3T resting state fMRI and the 7T resting state fMRI with right motor cortex seed voxel.  ... 
doi:10.1117/12.911307 pmid:23024573 pmcid:PMC3460373 dblp:conf/miip/YangHNML12 fatcat:jklblqfxfbh5vhydh6yrqidjl4

Evaluation of Statistical Inference on Empirical Resting State fMRI

Xue Yang, Hakmook Kang, Allen T. Newton, Bennett A. Landman
2014 IEEE Transactions on Biomedical Engineering  
Modern statistical inference techniques may be able to improve the sensitivity and specificity of resting state functional magnetic resonance imaging (rs-fMRI) connectivity analysis through more realistic  ...  (e.g., 7T fMRI).  ...  This study was conducted in part using the resources of the Advanced Computing Center for Research and Education at Vanderbilt University, Nashville, TN, USA.  ... 
doi:10.1109/tbme.2013.2294013 pmid:24658234 pmcid:PMC5826557 fatcat:4n3a5flcvjej3n3epy65vqcbam

A proof-of-principle study of multi-site real-time functional imaging at 3T and 7T: Implementation and validation

Sebastian Baecke, Ralf Lützkendorf, Johannes Mallow, Michael Luchtmann, Claus Tempelmann, Jörg Stadler, Johannes Bernarding
2015 Scientific Reports  
For that reason, a previously developed framework that provided an integrated control and data analysis of rtfMRI experiments was extended to enable multi-site rtfMRI.  ...  This information is provided in real-time by an online statistical analysis of change in the so-called BOLD (blood oxygen level dependent) signal, which serves as an indirect measure of neuronal activation  ...  For comparison with the realtime data analysis, BOLD signals of scan 8 to 10 of each block were averaged and used for further statistical analysis as here the BOLD signal was expected to exhibit its maximum  ... 
doi:10.1038/srep08413 pmid:25672521 pmcid:PMC4325335 fatcat:lyma3nlwgjewlf3oh2zg5hbscq

EEG and fMRI connectomes are reliably related: a simultaneous EEG-fMRI study from 1.5T to 7T [article]

Jonathan Wirsich, Joao Jorge, Giannina R Iannotti, Elhum A Shamshiri, Frederic Grouiller, Rodolfo Abreu, Francois Lazeyras, Anne-Lise Giraud, Rolf Gruetter, Sepideh Sadaghiani, Serge Vulliemoz
2020 biorxiv/medrxiv   pre-print
Data was acquired from 1.5T, 3T and 7T scanners with simultaneously recorded EEG using 64 or 256 electrodes.  ...  Here, we investigated the reliability of the bimodal EEG-fMRI functional connectome in the most comprehensive resting-state simultaneous EEG-fMRI dataset compiled to date including a total of 72 subjects  ...  JJ, FL and RG were supported by Centre d'Imagerie BioMédicale (CIBM) of the UNIL, UNIGE, HUG, CHUV, EPFL and the Leenaards and Jeantet Foundations.  ... 
doi:10.1101/2020.06.16.154625 fatcat:ktgkxfrawnafnng7rrt6eg4qg4

The Human Connectome Project: A data acquisition perspective

D.C. Van Essen, K. Ugurbil, E. Auerbach, D. Barch, T.E.J. Behrens, R. Bucholz, A. Chang, L. Chen, M. Corbetta, S.W. Curtiss, S. Della Penna, D. Feinberg (+15 others)
2012 NeuroImage  
, including a new 7T scanner, a customized 3T scanner, and improved MR pulse sequences.  ...  The imaging modalities will include diffusion imaging (dMRI), resting-state fMRI (R-fMRI), task-evoked fMRI (T-fMRI), T1-and T2-weighted MRI for structural and myelin mapping, plus combined magnetoencephalography  ...  Members of the WU-Minn HCP Consortium are listed at http://www.humanconnectome.org/about/hcp-investigators.html and http:// www.humanconnectome.org/about/hcp-colleagues.html.  ... 
doi:10.1016/j.neuroimage.2012.02.018 pmid:22366334 pmcid:PMC3606888 fatcat:firqe2mmjjdj7dhjbrbwytpbsa

FMRI multi-scale cortical spontaneous activity: 7T vs. 3T [article]

Xiu-Xia Xing, Chao Jiang, Xiao Gao, Yin-Shan Wang, Xi-Nian Zuo
2021 bioRxiv   pre-print
, and discussed about the statistical implications for experimental design using resting-state fMRI.  ...  Specifically, the resting-state functional MRI signals acquired under the HCP 3 tesla (T) and 7T magnet protocols were measured by computational methods at multiple spatial scales across the cerebral cortex  ...  at a resting-state (rfMRI) [6, 7, 17, 35] .  ... 
doi:10.1101/2021.06.09.447694 fatcat:vkmzypbkkfaobcebtb2istxhy4

Imaging human engrams using 7 Tesla magnetic resonance imaging

Tom Willems, Katharina Henke
2021 Hippocampus  
Although most engram research in humans is still being performed with a field strength of 3T, fMRI at 7T will push engram research.  ...  Here, we summarize the current state and findings of human engram research and discuss the advantages and disadvantages of applying 7 versus 3T fMRI to image human memory traces.  ...  7T or is better off with an established infrastructure at 3T.  ... 
doi:10.1002/hipo.23391 pmid:34739173 fatcat:yup7ozbv4fct5ieclzupfwj2jq

Pushing spatial and temporal resolution for functional and diffusion MRI in the Human Connectome Project

Kamil Uğurbil, Junqian Xu, Edward J. Auerbach, Steen Moeller, An T. Vu, Julio M. Duarte-Carvajalino, Christophe Lenglet, Xiaoping Wu, Sebastian Schmitter, Pierre Francois Van de Moortele, John Strupp, Guillermo Sapiro (+15 others)
2013 NeuroImage  
We describe technical improvements and optimization of these methods as well as instrumental choices that impact speed of acquisition of fMRI and dMRI images at 3T, leading to whole brain coverage with  ...  2 mm isotropic resolution in 0.7 s for fMRI, and 1.25 mm isotropic resolution dMRI data for tractography analysis with three-fold reduction in total dMRI data acquisition time.  ...  Acknowledgments The work reported in this article was supported by the Human Connectome Project (1U54MH091657) from the 16 Institutes and Centers of the National Institutes of Health that support the NIH  ... 
doi:10.1016/j.neuroimage.2013.05.012 pmid:23702417 pmcid:PMC3740184 fatcat:wajdgqkztvg43eyxxovlxlshky

Sources of functional magnetic resonance imaging signal fluctuations in the human brain at rest: a 7 T study

Marta Bianciardi, Masaki Fukunaga, Peter van Gelderen, Silvina G. Horovitz, Jacco A. de Zwart, Karin Shmueli, Jeff H. Duyn
2009 Magnetic Resonance Imaging  
To determine the relative contribution of these sources we recorded physiological (respiration and cardiac) signals simultaneously with fMRI in human volunteers at rest with their eyes closed.  ...  similar conditions at 3T.  ...  Acknowledgments This research was supported by the Intramural Research Program of the National Institutes of Health, National Institutes of Neurological Disorders and Stroke. We thank Alan P.  ... 
doi:10.1016/j.mri.2009.02.004 pmid:19375260 pmcid:PMC3512098 fatcat:qy76sagjrrffvpl6xxa3777auu

Minimal Specifications for Non-Human Primate MRI: Challenges in Standardizing and Harmonizing Data Collection [article]

Joonas A. Autio, Qi Zhu, Xiaolian Li, Matthew F. Glasser, Caspar M. Schwiedrzik, Damien A. Fair, Jan Zimmermann, Essa Yacoub, Ravi S. Menon, David C. Van Essen, Takuya Hayashi, Brian Russ (+1 others)
2020 arXiv   pre-print
Streamlined acquisition and analysis protocols would accelerate and improve these efforts.  ...  of NHP MRI data and the need for robust multi-subject multi-center analyses.  ...  coil (A) at 3T (Autio et al., 2020) and (B) at 7T (Gilbert et al., 2016) .  ... 
arXiv:2010.04325v1 fatcat:6ytdjkbw3fbo5athaczixfod64

Comparison of SMS-EPI and 3D-EPI at 7T in an fMRI localizer study with matched spatiotemporal resolution and homogenized excitation profiles

Caroline Le Ster, Antonio Moreno, Franck Mauconduit, Vincent Gras, Ruediger Stirnberg, Benedikt A. Poser, Alexandre Vignaud, Evelyn Eger, Stanislas Dehaene, Florent Meyniel, Nicolas Boulant, Nick Todd
2019 PLoS ONE  
The aim of this work was to compare the SMS-EPI and the 3D-EPI sequences in terms of sampling strategies for the detection of task-evoked activations at 7T using detection theory.  ...  ), where results from a previous large-scale study at 3T (N = 81) served as ground-truth reference for the brain areas implicated in each cognitive function.  ...  at 7T and using pTx UPs, for matched spatial and temporal resolutions, highly similar to that of the resting-state fMRI protocol of HCP [48] .  ... 
doi:10.1371/journal.pone.0225286 pmid:31751410 pmcid:PMC6872176 fatcat:wx53z4ofjvdtbaoovcqrns7xea

Individualized Functional Parcellation of the Human Amygdala Using a Semi-supervised Clustering Method: A 7T Resting State fMRI Study

Xianchang Zhang, Hewei Cheng, Zhentao Zuo, Ke Zhou, Fei Cong, Bo Wang, Yan Zhuo, Lin Chen, Rong Xue, Yong Fan
2018 Frontiers in Neuroscience  
Previous attempts to parcellate this small structure using unsupervised clustering methods based on resting state fMRI data suffered from the low spatial resolution of typical fMRI data, and it remains  ...  In this study, we developed a novel brain parcellation method to segment the human amygdala into spatially contiguous subregions based on 7T high resolution fMRI data.  ...  This work was supported in part by National Key Basic Research and Development Program (China MOST Grants No. 2015CB856404, 2015CB351701), in part by Grants of Chinese Academy of Sciences Strategic Priority  ... 
doi:10.3389/fnins.2018.00270 pmid:29755313 pmcid:PMC5932177 fatcat:s4gsnlstgvgrrnuys26yjyxvbq

Minimal Specifications for Non-Human Primate MRI: Challenges in Standardizing and Harmonizing Data Collection

Joonas A. Autio, Qi Zhu, Xiaolian Li, Matthew F. Glasser, Caspar M. Schwiedrzik, Damien A. Fair, Jan Zimmermann, Essa Yacoub, Ravi S. Menon, David C. Van Essen, Takuya Hayashi, Brian Russ (+1 others)
2021 NeuroImage  
Streamlined acquisition and analysis protocols would accelerate and improve these efforts.  ...  of NHP MRI data and the need for robust multi-subject multi-center analyses.  ...  support the NIH Blueprint for Supplementary materials Supplementary material associated with this article can be found, in the online version, at doi: 10.1016/j.neuroimage.2021.118082 .  ... 
doi:10.1016/j.neuroimage.2021.118082 pmid:33882349 pmcid:PMC8594288 fatcat:rcy2qe2o75gybigrak6hyigupa

Working memory load-dependent changes in cortical network connectivity estimated by machine learning

Hamdi Eryilmaz, Kevin F. Dowling, Dylan E. Hughes, Anais Rodriguez-Thompson, Alexandra Tanner, Charlie Huntington, William G. Coon, Joshua L. Roffman
2020 NeuroImage  
Our findings reveal the large-scale impact of working memory load on the cerebral cortex and highlight the complex dynamics of intrinsic brain networks during active task states.  ...  Working memory engages multiple distributed brain networks to support goal-directed behavior and higher order cognition.  ...  Acknowledgments This study was supported by the National Institutes of Health (R01MH101425 to JLR, K01MH116369 to HE, and 1S10RR023401), Rappaport Foundation to JLR, and David Judah Fund to JLR.  ... 
doi:10.1016/j.neuroimage.2020.116895 pmid:32360929 pmcid:PMC8202087 fatcat:5ulvrrwm3zbvpmlrjdcymi3qam

Hierarchical organization of the human subcortex unveiled with functional connectivity gradients [article]

Ye Tian, Daniel S Margulies, Michael Breakspear, Andrew Zalesky
2020 bioRxiv   pre-print
Ultra-high field strength fMRI corroborated and extended this hierarchy, enabling delineation of finer subdivisions of hippocampus and amygdala, while task-evoked fMRI revealed a subtle reorganization  ...  We revealed the astoundingly complex topographic organization of the human subcortex by disambiguating smooth connectivity gradients from discrete areal boundaries in resting-state fMRI data acquired from  ...  Acknowledgements We thank Dr Matthew Glasser for provision of the Wishart filter. We thank Dr Luca Cocchi  ... 
doi:10.1101/2020.01.13.903542 fatcat:pbxkhab7zvf7hppfmtz3iaskeu
« Previous Showing results 1 — 15 out of 324 results