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Sources of functional magnetic resonance imaging signal fluctuations in the human brain at rest: a 7 T study by Marta Bianciardi; Masaki Fukunaga; Peter van Gelderen; Silvina G. Horovitz; Jacco A. de Zwart; Karin Shmueli; Jeff H. Duyn is a Medicine article available to read on EtoBox.
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Signal fluctuations in functional magnetic resonance imaging (fMRI) can result from a number of sources that may have a neuronal, physiologic or instrumental origin. To determine the relative contribution of these sources, we recorded physiological (respiration and cardiac) signals simultaneously with fMRI in human volunteers at rest with their eyes closed. State-of-the-art technology was used including high magnetic field (7 T), a multichannel detector array and high-resolution (3 mm 3 ) echo-planar imaging. We investigated the relative contribution of thermal noise and other sources of variance to the observed fMRI signal fluctuations both in the visual cortex and in the whole brain gray matter. The following sources of variance were evaluated separately: low-frequency drifts due to scanner instability, effects correlated with respiratory and cardiac cycles, effects due to variability in the respiratory flow rate and cardiac rate, and other sources, tentatively attributed to spontaneous neuronal activity. We found that low-frequency drifts are the most significant source of fMRI signal fluctuations (3.0% signal change in the visual cortex, TE=32 ms), followed by spontaneous neuro
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- Author
- Marta Bianciardi; Masaki Fukunaga; Peter van Gelderen; Silvina G. Horovitz; Jacco A. de Zwart; Karin Shmueli; Jeff H. Duyn
- Publisher
- Elsevier Science; Elsevier ; Elsevier BV (ISSN 0730-725X)
- Published
- 2009
- Language
- EN
- Field
- Medicine (Health Sciences)