Results 1 to 10 of about 348,367 (159)

Hemodynamically informed parcellation of cerebral FMRI data [PDF]

Acoustics, Speech and Signal Processing (ICASSP), 2014 IEEE International Conference on, May 2014, Florence, Italy. pp.2079 - 2083, 2015
Standard detection of evoked brain activity in functional MRI (fMRI) relies on a fixed and known shape of the impulse response of the neurovascular coupling, namely the hemodynamic response function (HRF). To cope with this issue, the joint detection-estimation (JDE) framework has been proposed.
Ciuciu, Philippe, Forbes, Florence, Frau-Pascual, Aina, Vincent, Thomas   +3 more
arxiv   +7 more sources

Reconstruction of time-shifted hemodynamic response [PDF]

Scientific Reports, 2022
Regression of voxel time course onto expected response is a standard procedure in functional magnetic resonance imaging that relies on exact onset time and shape of superimposed hemodynamic response functions.
Bärbel Herrnberger
doaj   +2 more sources

Multiscale adaptive smoothing models for the hemodynamic response function in fMRI [PDF]

Annals of Applied Statistics 2013, Vol. 7, No. 2, 904-935, 2013
In the event-related functional magnetic resonance imaging (fMRI) data analysis, there is an extensive interest in accurately and robustly estimating the hemodynamic response function (HRF) and its associated statistics (e.g., the magnitude and duration of the activation).
Fan, Jianqing, Giovanello, Kelly, Lin, Weili, Wang, Jiaping, Zhu, Hongtu   +4 more
arxiv   +7 more sources

HRF estimation improves sensitivity of fMRI encoding and decoding models [PDF]

arXiv, 2013
Extracting activation patterns from functional Magnetic Resonance Images (fMRI) datasets remains challenging in rapid-event designs due to the inherent delay of blood oxygen level-dependent (BOLD) signal. The general linear model (GLM) allows to estimate the activation from a design matrix and a fixed hemodynamic response function (HRF).
Eickenberg, Michael, Gramfort, Alexandre, Pedregosa, Fabian, Thirion, Bertrand   +3 more
arxiv   +6 more sources

Physiological Gaussian Process Priors for the Hemodynamics in fMRI Analysis [PDF]

, 2017
Background: Inference from fMRI data faces the challenge that the hemodynamic system that relates neural activity to the observed BOLD fMRI signal is unknown. New Method: We propose a new Bayesian model for task fMRI data with the following features: (i) joint estimation of brain activity and the underlying hemodynamics, (ii) the hemodynamics is ...
Eklund, Anders, Villani, Mattias, Wilzén, Josef   +2 more
arxiv   +3 more sources

Human Brain Mapping based on COLD Signal Hemodynamic Response and Electrical Neuroimaging [PDF]

, 2013
To understand Working of Human Brain measurements related to the brain function are required. These measurements should be possibly non-invasive. Brain should be disturbed as less as possible during the measurement. Integration of various modalities plays a vital role in understanding the cognitive and the behavioral changes in the human brain.
Daimiwal, Nivedita, Shriram, Revati, Sundhararajan, M.   +2 more
arxiv   +3 more sources

Effect of age on the median effective dose and 95% effective dose of intravenous fentanyl for blunting the hemodynamic response to tracheal intubation: A double-blind, up-and-down sequential method trial [PDF]

Journal of Anaesthesiology Clinical Pharmacology
Background and Aims: Control of the hemodynamic response during intubation is essential. To assess the effect of age on the median effective dose (ED50) and 95% effective dose (ED95) of fentanyl for blunting the hemodynamic response to intubation ...
Jatuporn Eiamcharoenwit, Phuping Akavipat   +1 more
doaj   +2 more sources

Motion artifacts removal and evaluation techniques for functional near-infrared spectroscopy signals: A review

Frontiers in Neuroscience, 2022
With the emergence of an increasing number of functional near-infrared spectroscopy (fNIRS) devices, the significant deterioration in measurement caused by motion artifacts has become an essential research topic for fNIRS applications.
Ruisen Huang, Keum-Shik Hong, Keum-Shik Hong, Dalin Yang, Guanghao Huang   +4 more
doaj   +1 more source

Improvement in Hemodynamic Responses to Metaboreflex Activation after One Year of Training in Spinal Cord Injured Humans [PDF]

, 2014
Spinal cord injured (SCI) individuals show an altered hemodynamic response to metaboreflex activation due to a reduced capacity to vasoconstrict the venous and arterial vessels below the level of the lesion.
Angius, Luca, Bassareo, Pierpaolo, Concu, Alberto, Crisafulli, Antonio, Marongiu, Elisabetta, Milia, Raffaele, Olla, Sergio, Pinna, Marco, Roberto, Silvana, Sanna, Irene, Tocco, Filippo   +10 more
core   +9 more sources

Dual-slope imaging of cerebral hemodynamics with frequency-domain near-infrared spectroscopy [PDF]

Neurophoton. 10(1), 013508 (2023), 2022
Significance: This work targets the contamination of optical signals by superficial hemodynamics, which is one of the chief hurdles in non-invasive optical measurements of the human brain. Aim: To identify optimal source-detector distances for Dual-Slope (DS) measurements in Frequency-Domain (FD) Near-InfraRed Spectroscopy (NIRS) and demonstrate ...
arxiv   +1 more source