Results 1 to 10 of about 1,179,344 (162)

Transfer function analysis assesses resting cerebral perfusion metrics using hypoxia-induced deoxyhemoglobin as a contrast agent [PDF]

Frontiers in Physiology, 2023
Introduction: Use of contrast in determining hemodynamic measures requires the deconvolution of an arterial input function (AIF) selected over a voxel in the middle cerebral artery to calculate voxel wise perfusion metrics.
Ece Su Sayin, Ece Su Sayin, Olivia Sobczyk, Olivia Sobczyk, Julien Poublanc, David J. Mikulis, Joseph A. Fisher, Joseph A. Fisher, Joseph A. Fisher, James Duffin, James Duffin   +10 more
doaj   +2 more sources

Assessment of cerebrovascular function in patients with sickle cell disease using transfer function analysis [PDF]

Physiological Reports, 2022
In patients with sickle cell disease (SCD), the delivery of oxygen to the brain is compromised by anemia, abnormal rheology, and steno‐occlusive vascular disease. Successful compensation depends on an increase in oxygen supply such as that provided by an
Ece Su Sayin, Olivia Sobczyk, Julien Poublanc, David J. Mikulis, Joseph A. Fisher, Kevin H. M. Kuo, James Duffin   +6 more
doaj   +2 more sources

Continuous wavelet based transfer function analysis of cerebral autoregulation dynamics for neuromonitoring using near-infrared spectroscopy [PDF]

Frontiers in Physiology
IntroductionNear-infrared spectroscopy is now a popular method in neuromonitoring. Derived parameters like cerebral oxygenation index or Fast Fourier Transform based coherence estimates between blood pressure and cerebral blood flow have their ...
Marcus Thudium, Evgeniya Kornilov, Evgeniya Kornilov, Stefan Moestl, Fabian Hoffmann, Fabian Hoffmann, Alex Hoff, Surat Kulapatana, Surat Kulapatana, Surat Kulapatana, Vasile Urechie, Vasile Urechie, Maximilian Oremek, Stefano Rigo, Stefano Rigo, Stefano Rigo, Karsten Heusser, Italo Biaggioni, Jens Tank, André Diedrich, André Diedrich   +20 more
doaj   +2 more sources

Feature Selection Using New Version of V-Shaped Transfer Function for Salp Swarm Algorithm in Sentiment Analysis

Computation, 2023
(1) Background: Feature selection is the biggest challenge in feature-rich sentiment analysis to select the best (relevant) feature set, offer information about the relationships between features (informative), and be noise-free from high-dimensional ...
Dinar Ajeng Kristiyanti, Imas Sukaesih Sitanggang, Annisa, Sri Nurdiati   +3 more
doaj   +3 more sources

Transfer function analysis in epi-illumination Fourier ptychography [PDF]

Optics Letters, 2015
This Letter explores Fourier ptychography (FP) using epi-illumination. The approach effectively modifies the FP transfer function to be coherent-like out to the incoherent limit of twice the numerical aperture over the wavelength 2NA/λ. Images reconstructed using this approach are shown to have higher contrast at finer details compared with images ...
Shaun, Pacheco, Basel, Salahieh, Tom, Milster, Jeffrey J, Rodriguez, Rongguang, Liang   +4 more
openaire   +3 more sources

Dynamic cerebral autoregulation quantification with spontaneous arterial blood pressure oscillations: Is transfer function analysis our best option? [PDF]

Experimental Physiology
Patrice Brassard, Jonathan D. Smirl
doaj   +2 more sources

Cerebral Augmentation Effect Induced by External Counterpulsation Is Not Related to Impaired Dynamic Cerebral Autoregulation in Ischemic Stroke

Frontiers in Neurology, 2022
Background and PurposeDynamic cerebral autoregulation is impaired after ischemic stroke. External counterpulsation (ECP) augments the cerebral blood flow of patients with ischemic stroke by elevation of blood pressure (BP).
Li Xiong, Li Xiong, Xiangyan Chen, Jia Liu, Lawrence Ka Sing Wong, Thomas W. Leung   +5 more
doaj   +1 more source

Differentiating Dynamic Cerebral Autoregulation Across Vascular Territories

Frontiers in Neurology, 2021
Objective: Transcranial Doppler is commonly used to calculate cerebral autoregulation, but measurements are typically restricted to a single cerebral artery.
Navpreet Reehal, Stephanie Cummings, Michael T. Mullen, Wesley B. Baker, David Kung, William Tackett, Christopher G. Favilla   +6 more
doaj   +1 more source

The consistency of invasive and non-invasive arterial blood pressure for the assessment of dynamic cerebral autoregulation in NICU patients

Frontiers in Neurology, 2022
BackgroundStudies of the clinical application of dynamic cerebral autoregulation show considerable variations, and differences in blood pressure devices may be one of the reasons for this variation.
Weijun Zhang, Hongji Lu, Jia Liu, Aihua Ou, Pandeng Zhang, Jingxin Zhong   +5 more
doaj   +1 more source

Does depth of squat‐stand maneuver affect estimates of dynamic cerebral autoregulation?

Physiological Reports, 2020
Repeated squat‐stand maneuvers (SSM) are an effective way of measuring dynamic cerebral autoregulation (dCA), but the depth of SSM required to improve dCA estimations has never been studied.
Angus P. Batterham, Ronney B. Panerai, Thompson G. Robinson, Victoria J. Haunton   +3 more
doaj   +1 more source