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Sunday, May 3, 2020 | History

4 edition of Assessment of cerebral vascular reactivity evaluation by bold fMRI found in the catalog.

Assessment of cerebral vascular reactivity evaluation by bold fMRI

Assessment of cerebral vascular reactivity evaluation by bold fMRI

a study of normals, migraineurs, and patients with severe vascular disease.

by

  • 196 Want to read
  • 15 Currently reading

Published by National Library of Canada in Ottawa .
Written in English


Edition Notes

Thesis (M.Sc.) -- University of Toronto, 2002.

SeriesCanadian theses = -- Th`eses canadiennes
The Physical Object
FormatMicroform
Pagination2 microfiches : negative.
ID Numbers
Open LibraryOL20042518M
ISBN 100612741087
OCLC/WorldCa54372734


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Assessment of cerebral vascular reactivity evaluation by bold fMRI Download PDF EPUB FB2

Cerebral Vascular Reactivity Evaluation by BOLD fMRI Article in University of Toronto medical journal January with 13 Reads How we measure 'reads'. Cerebrovascular reactivity (CVR) reflects the capacity of blood vessels to dilate and is an important marker for brain vascular reserve.

It may provide a useful addition to the traditional baseline blood flow measurement when assessing vascular factors in brain by: In conclusion, functional MRI techniques (BOLD and ASL) are an alternative to PET, SPECT, and TCD for the assessment of CVR and can be easily included during an MR imaging scan for clinical purposes.

Those methods are robust, reliable and reproducible, allowing assessment of CVR in patients with cerebrovascular by: Purpose: This pilot study aims to test the reliability and clinical validity of the assessment of cerebrovascular reactivity (CVR) with real-time blood-oxygen-level-dependent (BOLD) fMRI.

Request PDF | Evaluation of vascular reactivity to overcome limitations of neurovascular uncoupling in BOLD fMRI of malignant brain tumors | The sensitivity of fMRI in identification of eloquent.

Cerebral vascular reactivity (CVR) is a measure of a blood vessel’s response to a vasoactive stimulus, such as the manipulation of arterial levels of CO 2.

Recently, functional magnetic resonance Author: Alexander D. Cohen, Yang Wang. The aim of this prospective study is to assess microvascular injury/dysfunction in chronic TBI by measuring cerebral vascular reactivity (CVR) by 2 methods, functional magnetic resonance imaging (fMRI) and functional Near InfraRed Spectroscopy (fNIRS) imaging, as each has attractive features relevant to clinical : Franck Amyot, Kimbra Kenney, Emily Spessert, Carol Moore, Margalit Haber, Erika Silverman, Amir Gand.

The aim of this prospective study is to assess microvascular injury/dysfunction in chronic TBI by measuring cerebral vascular reactivity (CVR) by 2 methods, functional magnetic resonance imaging. Introduction. The brain has different systems to control blood distribution.

Cerebral vasoreactivity (CVR) is one of them. This system responds to the concentration of circulating gas in blood vessels, such as carbon dioxide (CO 2).Studying CVR using vasoactive stimuli and functional magnetic resonance imaging (fMRI) with blood oxygen level dependent (BOLD) contrast is an emerging technique.Cited by: 7.

Noninvasive assessment of CO 2-induced cerebral vasomotor response in normal individuals and patients with internal carotid artery occlusions. Stroke. ; – Ringelstein EB, Van Eyck S, Mertens I. Evaluation of cerebral vasomotor reactivity by various vasodilating stimuli: comparison of CO 2 to acetazolamide.

J Cereb Blood Flow by: Cerebrovascular reactivity and the fMRI-BOLD response in cardiorespiratory fitness. View/ Open. GONZALES-DISSERTATIONpdf (Mb) Sedentary and endurance-trained middle-aged adults underwent general health assessment, neuropsychological testing, and functional magnetic resonance imaging (fMRI) during a working memory task and a.

Feasibility and safety of intraoperative BOLD functional MRI cerebrovascular reactivity to Assessment of cerebral vascular reactivity evaluation by bold fMRI book extracranial-to-intracranial bypass efficacy Consecutive evaluation of the cerebral hemodynamic status with H even if intraoperative BOLD-CVR assessment could prove to be nonsuperior to other techniques for predicting the ultimate bypass Cited by: 1.

Distinct from earlier analysis at the voxel-level, subject-level correlations were performed in the present study after estimating the mean amplitude of fMRI-BOLD responses within the task-activated regions of interest in every subject.

The results supported our hypothesis that subject-related physiology and/or BH-related performance differences impact subject-level CVR in an age-dependent manner since linear Cited by:   The association between cerebrovascular reactivity and resting-state fMRI functional connectivity in healthy adults: The influence of basal carbon dioxide Author links open overlay panel Ali M.

Golestani a Jonathan B. Kwinta a b 1 Stephen C. Strother a b Yasha B. Khatamian a J. Jean Chen a bCited by: A comprehensive study with the assessment of reactive responses to motor tasks was performed in nine patients with a tumor localized in the frontal divisions of the brain using two methodological approaches: functional magnetic resonance imaging (fMRI) and EEG.

The data obtained were compared to the results of a similar study on 12 healthy Cited by: 3. Functional Magnetic Resonance Imaging Detection of Vascular Reactivity in Cerebral Amyloid Angiopathy Article in Annals of Neurology 72(1) July with.

Specifically, cerebrovascular reactivity (CVR), which allows the assessment of the vascular response that serves as the basis for fMRI, has been shown to be reduced in healthy aging as well as in a range of diseases, including chronic stroke. However, the timing of when this occurs relative to the stroke Cited by: 7.

Functional MRI (fMRI) studies are increasingly using CO 2 changes to provide a quantitative estimate of observed BOLD signal changes, an approach often referred to as calibrated fMRI.

In calibrated fMRI studies, the lack of concomitant changes in oxygen consumption during hypercapnia is exploited to estimate the neurovascular coupling Cited by:   Abstract.

On the assessment of cerebrovascular reactivity using hypercapnia BOLD MRI Uma S. Yezhuvatha, Kelly Lewis-Amezcuaa, Rani Varghesea, Guanghua Xiaob and Hanzhang Lua * Cerebrovascular reactivity (CVR) reï¬ ects the capacity of blood vessels to dilate and is an important marker for brain vascular reserve.

BACKGROUND AND PURPOSE: Tools for noninvasive mapping of hemodynamic function including cerebrovascular reactivity are emerging and may become clinically useful to predict tissue at hemodynamic risk.

One such technique assesses blood oxygen level–dependent (BOLD) MR imaging contrast in response to hypercapnia, but the reliability of its quantification is by:   Obstructive sleep apnea (OSA) is characterized by intermittent obstruction of the airways during sleep.

Cerebrovascular reactivity (CVR) is an index of cerebral vessels' ability to respond to a vasoactive stimulus, such as increased CO hypothesized that OSA alters CVR, expressed as a breath-hold index (BHI) defined as the rate of change in CBF or BOLD signal during a controlled Cited by: 1.

Background and Purpose— Comparative studies across populations using functional magnetic resonance imaging (fMRI) rely on a similar relationship between blood oxygen level-dependent (BOLD) signal and neural activity. However, in elderly and patients with cerebrovascular disease, impaired cerebrovascular dynamics and neurovascular coupling may explain differences in BOLD contrast Cited by: ABSTRACT BACKGROUND AND PURPOSE Several methods are being used to assess cerebral vasomotor reactivity (CVR), including transcranial Doppler (TCD) sonography and blood oxygenation level‐dependent f Cited by:   Cerebrovascular reactivity (CVR) refers to the responsiveness of cerebral vasculature to vasoactive stimuli.

CVR is an indicator of brain health and can be assessed using vasodilatory techniques and magnetic resonance imaging (MRI).Cited by: 5. Impaired cerebrovascular reactivity (CVR), a predictive factor of imminent stroke, has been shown to be associated with carotid steno-occlusive disease.

Magnetic resonance imaging (MRI) techniques, such as blood oxygenation level-dependent (BOLD) and arterial spin labeling (ASL), have emerged as promising noninvasive tools to evaluate altered CVR with whole-brain coverage, when combined with a Cited by:   SUMMARY: This review article explains the methodology of breath-hold cerebrovascular reactivity mapping, both in terms of acquisition and analysis, and reviews applications of this method to presurgical mapping, particularly with respect to blood oxygen level–dependent fMRI.

Its main application in clinical fMRI is for the assessment of neurovascular uncoupling by: Background and Purpose— Comparative studies across populations using functional magnetic resonance imaging (fMRI) rely on a similar relationship between blood oxygen level-dependent (BOLD Cited by:   Measuring vascular reactivity (VR) provides insights into vascular health and assists in the diagnosis and treatment planning of cerebrovascular diseases such as carotid stenosis and Moyamoya disease.

1 –3 VR studies quantify the ability of vessels to respond to a vasodilatory stimulus, such as a change in arterial carbon dioxide (P a CO 2) levels. While many different modalities, Cited by: Gregory Krolczyk has written: 'Assessment of cerebral vascular reactivity evaluation by bold fMRI' Asked in Chimpanzees Which two procedures allow researchers to visualize changes in brain.

Search term. Advanced Search Citation Search. Search termCited by: To evaluate whether breath-holding (BH) BOLD fMRI can quantify differences in vascular reactivity (VR), as there is a need for improved contrast mechanisms in gliomas.

Methods 16 patients (gliomas, grade II=5, III=2, IV=9) were evaluated using the BH paradigm: 4second single deep breath followed by 16seconds of BH and 40seconds of regular. Introduction. Functional magnetic resonance imaging (fMRI) has made important contributions to our understanding of post-stroke brain changes.

fMRI can provide valuable insight in terms of characterizing brain plasticity changes as well as the prediction of outcomes and assessment of recovery after stroke (Calautti and Baron,Heiss and Kidwell,Ward et al., ).Cited by: 7.

Presence of cerebral microbleeds and cerebrovascular reactivity. Left graph represent BOLD fMRI amplitude responses and the right graph represent BOLD fMRI time to peak responses for persons with and without microbleeds. Horizontal bars represent the unadjusted mean response of the subgroups.

P, p value, fMRI, functional by: 2. Cerebrovascular reactivity in degenerative and vascular dementia: a transcranial Doppler study. Eur Neurol. ;58(2)– ArticlePubMedGoogle ScholarCantin S, Villien M, Moreaud O, Tropres I, Keignart S, Chipon E, Le Bas JF, Warnking J, Krainik A. Impaired cerebral vasoreactivity to CO2 in Alzheimer’s disease using BOLD by: 5.

Purpose (i) to validate blood oxygenation level dependent (BOLD) breathhold cerebrovascular reactivity (BH CVR) mapping as an effective technique for potential detection of neurovascular uncoupling Cited by: Thomas BP, Yezhuvath US, Tseng BY, Liu P, Levine BD, Zhang R, Lu H. Life-long aerobic exercise preserved baseline cerebral blood flow but reduced vascular reactivity to CO2.

J Magn Reson Imaging. Nov;38(5) doi: /jmri Functional MRI-BOLD of visually triggered headache in patients with migraine. Arch Neurol ; 5. Pietrobon D, Striessnig J.

Neurobiology of migraine. Nat Rev Neurosci ; 6. Krolczyk G. Cerebral vascular reactivity evaluation by BOLD fMRI. Medical Imaging ; 7. ABSTRACT BACKGROUND AND PURPOSE Several methods are being used to assess cerebral vasomotor reactivity (CVR), including transcranial Doppler (TCD) sonography and blood oxygenation level‐dependent functional magnetic resonance imaging (fMRI).

The aim was to assess the correlation of TCD and fMRI in the CVR assessment. METHODS Study group consisted of 28. Gregory Krolczyk has written: 'Assessment of cerebral vascular reactivity evaluation by bold fMRI' Asked in Celebrity Births Deaths and Ages When did Marcel Jullian die.

The present work examined the use of rsfMRI measures (i.e., RSFA) to correct for the vascular effects of age when studying task‐induced BOLD fMRI responses.

First, we characterized age differences in RSFA and determined the effects of RSFA scaling on age‐dependent fMRI‐BOLD signal change in a sensorimotor by:.

Cao Y, Welch KM, Aurora S, Vikingstad EM. Functional MRI-BOLD of visually triggered headache in patients with migraine. Arch Neurol ; Pietrobon D, Striessnig J. Neurobiology of migraine. Nat Rev Neurosci ; Krolczyk G. Cerebral vascular reactivity evaluation by BOLD fMRI.

Medical Imaging ;   ASL’s ability to directly measure muscle perfusion may prove to be a powerful tool for the evaluation of disease progression and the evaluation of therapies aimed at improving muscle perfusion.

As is the case with BOLD MRI, this holds particularly true for patients who are unable to receive contrast agents, a collective which is often Author: Sasan Partovi, Bjoern Jacobi, Yaron Gordon, Lisa Zipp, Anja-Carina Schulte, Sasan Karimi, Rolf Huegl.Precision of cerebrovascular reactivity assessment with use of different quantification methods for hypercapnia functional MR imaging.

AJNR Am J Neuroradiol ;30(5)– Crossref, Medline, Google Scholar; 3 Han JS, Mandell DM, Poublanc J et al. BOLD-MRI cerebrovascular reactivity findings in cocaine-induced cerebral by: