SciELO - Scientific Electronic Library Online

 
vol.64 issue4Preliminary evaluation of the endovascular treatment of intracranial aneurysms with detachable coils in vigil patients author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Arquivos de Neuro-Psiquiatria

Print version ISSN 0004-282X

Abstract

ANDRADE, Katia C. et al. Quantitative aspects of brain perfusion dynamic induced by BOLD fMRI. Arq. Neuro-Psiquiatr. [online]. 2006, vol.64, n.4, pp. 895-898. ISSN 0004-282X.  http://dx.doi.org/10.1590/S0004-282X2006000600001.

The increase of relative cerebral blood flow (rCBF) may contribute for a change in blood oxygenation level dependent signal (BOLD). The main purpose of this study is to investigate some aspects of perfusional alterations in the human brain in response to a uniform stimulation: hypercapnia induced by breath holding. It was observed that the BOLD signal increased globally during hypercapnia and that it is correlated with the time of breath holding. This signal increase shows a clear distinction between gray and white matter, being greater in the grey matter.

Keywords : functional MRI; fMRI; BOLD; perfusion.

        · abstract in Portuguese     · text in English     · pdf in English