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Abstract #2984

Evaluation of spiral imaging variants for high-resolution fMRI in human superior colliculus

Vimal Singh 1 and David Ress 2

1 Electrical Engineering, University of Texas at Austin, Austin, TX, United States, 2 Neuroscience, Baylor College of Medicine, Houston, TX, United States

Functional MRI in human superior colliculus (SC) requires high resolution. Dual-echo spiral has been used for high-resolution applications in cortex. Here we tune and evaluate various dual-echo spiral variants for sub-cortical application: single-echo spiral in, and dual-echo spiral in-in, in-out, and out-out. The functional signal-to-noise ratio of the activity evoked by visual stimulation was used as a performance metric. This metric was first used to find the optimal echo time for each variant. Then, using the optimal TE, each variant was compared to single-echo spiral out as a reference. Best performance was obtained for dual-echo spiral out.

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