نتایج جستجو برای: bold signal

تعداد نتایج: 426650  

Journal: :NeuroImage 2004
Richard G Wise Kojiro Ide Marc J Poulin Irene Tracey

Carbon dioxide is a potent cerebral vasodilator. We have identified a significant source of low-frequency variation in blood oxygen level-dependent (BOLD) magnetic resonance imaging (MRI) signal at 3 T arising from spontaneous fluctuations in arterial carbon dioxide level in volunteers at rest. Fluctuations in the partial pressure of end-tidal carbon dioxide (Pet(CO(2))) of +/-1.1 mm Hg in the ...

2009
Dionyssios Mintzopoulos Loukas G. Astrakas Masahiko Hiroki Azadeh Khanicheh Lawrence L. Wald Bruce R. Rosen A. Aria Tzika

We compared GRAPPA parallel MRI (pMRI) to regular MRI (non-GRAPPA) for BOLD fMRI while keeping all other parameters fixed. We acquired both GRAPPA and non-GRAPPA images using a high resolution as well as a low resolution EPI matrix. We found significantly larger values of percent BOLD signal when comparing higher resolution acquisitions to lower resolution ones, independently of whether data we...

Journal: :NeuroImage 2004
Eric R Cohen Egill Rostrup Karam Sidaros Torben E Lund Olaf B Paulson Kamil Ugurbil Seong-Gi Kim

The blood oxygenation level-dependent (BOLD) functional magnetic resonance imaging (fMRI) signal response to neural stimulation is influenced by many factors that are unrelated to the stimulus. These factors are physiological, such as the resting venous cerebral blood volume (CBV(v)) and vessel size, as well as experimental, such as pulse sequence and static magnetic field strength (B(0)). Thus...

Journal: :Stroke 2008
Daniel M Mandell Jay S Han Julien Poublanc Adrian P Crawley Jeff A Stainsby Joseph A Fisher David J Mikulis

BACKGROUND AND PURPOSE Blood oxygen level-dependent MRI (BOLD MRI) of hypercapnia-induced changes in cerebral blood flow is an emerging technique for mapping cerebrovascular reactivity (CVR). BOLD MRI signal reflects cerebral blood flow, but also depends on cerebral blood volume, cerebral metabolic rate, arterial oxygenation, and hematocrit. The purpose of this study was to determine whether, i...

Journal: :Bulletin of mathematical biology 2011
Roberto C Sotero Yasser Iturria-Medina

A theoretical framework is presented for converting Blood Oxygenation Level Dependent (BOLD) images to brain temperature maps, based on the idea that disproportional local changes in cerebral blood flow (CBF) as compared with cerebral metabolic rate of oxygen consumption (CMRO₂) during functional brain activity, lead to both brain temperature changes and the BOLD effect. Using an oxygen limitat...

Journal: :Journal of neurophysiology 2008
Mark McAvoy Linda Larson-Prior Tracy S Nolan S Neil Vaishnavi Marcus E Raichle Giovanni d'Avossa

The brain exhibits spontaneous neural activity that depends on the behavioral state of the organism. We asked whether the blood oxygenation level-dependent (BOLD) signal reflects these modulations. BOLD was measured under three steady-state conditions: while subjects kept their eyes closed, kept their eyes open, or while fixating. The BOLD spectral density was calculated across brain voxels and...

Journal: :The Journal of neuroscience : the official journal of the Society for Neuroscience 2011
Alexis T Baria Marwan N Baliki Todd Parrish A Vania Apkarian

Brain oscillatory activity has long been thought to have spatial properties, the details of which are unresolved. Here we examine spatial organizational rules for the human brain oscillatory activity as measured by blood oxygen level-dependent (BOLD) signal. Resting-state BOLD signal was transformed into frequency space (Welch's method) and averaged across subjects, and its spatial distribution...

2014
Pamela Moses Leanna M. Hernandez Elizabeth Orient

Functional magnetic resonance imaging (fMRI) has become a premiere technique for studying the development and neural mediation of a wide range of typical and atypical behaviors in children. While the mechanism of the blood oxygen level-dependent (BOLD) fMRI signal has been a focus of investigation in the mature brain, it has been largely unexamined in the developing brain. One critical componen...

2000
Adam W. Anderson Rene Marois Eve R. Colson Bradley S. Peterson Charles C. Duncan Richard A. Ehrenkranz Karen C. Schneider John C. Gore Laura R. Ment

The objective of this study was to detect auditory cortical activation in non-sedated neonates employing functional magnetic resonance imaging (fMRI). Using echo-planar functional brain imaging, subjects were presented with a frequency-modulated pure tone; the BOLD signal response was mapped in 5 mm-thick slices running parallel to the superior temporal gyrus. Twenty healthy neonates (13 term, ...

Journal: :Philosophical transactions of the Royal Society of London. Series B, Biological sciences 2002
Nikos K Logothetis

Magnetic resonance imaging (MRI) has rapidly become an important tool in clinical medicine and biological research. Its functional variant (functional magnetic resonance imaging; fMRI) is currently the most widely used method for brain mapping and studying the neural basis of human cognition. While the method is widespread, there is insufficient knowledge of the physiological basis of the fMRI ...

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