Journal
MAGNETIC RESONANCE IMAGING
Volume 22, Issue 1, Pages 9-13Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.mri.2003.08.003
Keywords
physiologic fluctuations; steady state free precession; aliasing; fMRI; BOLD
Ask authors/readers for more resources
Recent studies have shown that in certain cases, cardiac and respiratory rate fluctuations in BOLD-weighted MR1 time courses may be an artifact unique to rapid sampled acquisitions and may not be present in longer repetition-time acquisitions. The implication of this is that, in these cases, cardiac and respiratory rate fluctuations are not aliased into data that undersample these effects and do not affect the resulting time course measurements. In this study, we show that these cases are specific to regions of large cerebrospinal fluid content and are not generally true for gray matter regions of the brain. We demonstrate that in many brain regions of interest, these fluctuations are directly observed as BOLD fluctuations and thus will affect measurements that undersample these effects. (C) 2004 Elsevier Inc. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available