Abstract #1745

A coil-noise-dominated flexible array inside a whole-head coil to improve temporal SNR in non-human primate imaging

Kyle M Gilbert¹, Peter Zeman¹, Jorn Diedrichsen², Julio C Martinez-Trujilloc³, J Andrew Pruszynski³, and Ravi S Menon¹

¹Centre for Functional and Metabolic Mapping, The University of Western Ontario, London, ON, Canada, ²Department of Computer Science, The University of Western Ontario, London, ON, Canada, ³Department of Physiology and Pharmacology, The University of Western Ontario, London, ON, Canada

Typically, coil elements or arrays are dispersed on a two-dimensional surface to ensure their sensitivity profiles do not overlap, since correlated noise mitigates an SNR improvement when overlapping coils are operating in the sample-noise-dominated regime. In this study, we show that a small flexible array, operating in the coil-noise-dominated regime, can locally improve temporal SNR when placed inside a whole-head array. The two concentric arrays are inductively decoupled using preamplifier decoupling, and the contribution of coil noise to the overall noise reduces the noise correlation. Up to a two-fold increase in temporal SNR is achieved in the motor cortex.

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