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Abstract #1524

Simultaneous EEG-fMRI at 7T: Evaluation of Radio Frequency (RF) Heating and Shielding of a novel EEG cap

Rebecca Meagher1,2, Ozlem Ipek1,2, Tracy Warbrick3, and David W. Carmichael1,2
1Imaging Physics and Engineering Research Department, King's College London, London, United Kingdom, 2London Collaborative Ultra-High Field Systen (LoCUS), London, United Kingdom, 3Brain Products GmbH, Gilching, Germany

Synopsis

Keywords: Multimodal, Safety, EEG-fMRI

Motivation: EEG-fMRI at 7T can provide very high temporal and spatial resolution, allowing non-invasive investigation of human brain function at the meso-scale. However, it presents challenges: shorter RF wavelengths may increase coupling to the EEG cap, potentially leading to B1+ shielding and increased SAR deposition.

Goal(s): We investigated two iterations of a novel EEG cap designed to avoid RF coupling at 7T

Approach: B1+ maps with and without EEG cap were compared to investigate shielding. Temperature changes throughout scanning duration were analysed.

Results: Minimal heating at EEG electrodes was found, providing evidence that the risk of significant heating is low. B1+ were moderate.

Impact: Presently, EEG-fMRI is limited by fMRI sensitivity. EEG-fMRI at 7T offers a solution to this, because fMRI signal changes are substantially increased in magnitude. This could dramatically improve the technique’s sensitivity and spatial specificity for presurgical epilepsy evaluation.

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