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Abstract #1444

Spiral Keyhole (SpiralK) Imaging: an in silico investigation

Filipe Ledo1, Corey Baron1, and Ravi Menon1
1Medical Biophysics, Western University, Robarts Research, Centre for Functional and Metabolic Mapping, London, ON, Canada

Synopsis

Keywords: fMRI Acquisition, fMRI Acquisition, Spiral fMRI, Keyhole Imaging

Motivation: Achieving submillimetre imaging for applications such as laminar fMRI requires balancing temporal resolution with slice coverage and demands additional in-plane acceleration.

Goal(s): Characterize and validate SpiralK in the context of submillimetre spiral fMRI.

Approach: SpiralK simulations were conducted with varying keyhole sizes and accelerations while keeping the acquisition readout time.

Results: SpiralK activation maps demonstrated improved specificity at elevated t-thresholds. Increasing keyhole size was found to decrease the specificity of the activation maps. Improved tSNR and t-value metrics were found for SpiralK compared to the other simulated acquisitions.

Impact: SpiralK shows promise for achieving submillimetre resolutions with whole-brain coverage while maintaining appropriate temporal resolution.

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