Concentric radiofrequency arrays to increase the statistical power of resting-state maps in monkeys

NeuroImage
Kyle M GilbertRavi S Menon

Abstract

The close homology of monkeys and humans has increased the prevalence of non-human-primate models in functional MRI studies of brain connectivity. To improve upon the attainable resolution in functional MRI studies, a commensurate increase in the sensitivity of the radiofrequency receiver coil is required to avoid a reduction in the statistical power of the analysis. Most receive coils are comprised of multiple loops distributed equidistantly over a surface to produce spatially independent sensitivity profiles. A larger number of smaller elements will in turn provide a higher signal-to-noise ratio (SNR) over the same field of view. As the loops become physically smaller, noise originating from the sample is reduced relative to noise originating from the coil. In this coil-noise-dominated regime, coil elements can have overlapping sensitivity profiles, yet still possess only mildly correlated noise. In this manuscript, we demonstrate that inductively decoupled, concentric coil arrays can improve temporal SNR when operating in the coil-noise-dominated regime-in contrast to what is expected for the more ubiquitous sample-noise-dominated array. A small, thin, 7-channel flexible coil is developed and operated in conjunction with an ...Continue Reading

Citations

Dec 20, 2018·Physics in Medicine and Biology·Yang GaoXiaotong Zhang
Jan 30, 2021·NMR in Biomedicine·Russell L LagoreGregor Adriany
Feb 11, 2021·NMR in Biomedicine·Mark GosselinkDennis W J Klomp

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