On the Definition of Signal-To-Noise Ratio and Contrast-To-Noise Ratio for fMRI Data

Marijke Welvaert, Yves Rosseel

Research output: Contribution to journalArticle

179 Citations (Scopus)
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Abstract

Signal-to-noise ratio, the ratio between signal and noise, is a quantity that has been well established for MRI data but is still subject of ongoing debate and confusion when it comes to fMRI data. fMRI data are characterised by small activation fluctuations in a background of noise. Depending on how the signal of interest and the noise are identified, signal-to-noise ratio for fMRI data is reported by using many different definitions. Since each definition comes with a different scale, interpreting and comparing signal-to-noise ratio values for fMRI data can be a very challenging job. In this paper, we provide an overview of existing definitions. Further, the relationship with activation detection power is investigated. Reference tables and conversion formulae are provided to facilitate comparability between fMRI studies.
Original languageEnglish
Article numbere77089
Pages (from-to)1-10
Number of pages10
JournalPLoS One
Volume8
Issue number11
DOIs
Publication statusPublished - 6 Nov 2013
Externally publishedYes

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