Abstract #4314

Improved Transmit Field Homogeneity in Simultaneous EEG-fMRI at 7T by Increasing EEG Wire Resistance

Thanh Phong Lê¹, Özlem Ipek², João Jorge¹, and Rolf Gruetter^1,3,4

¹Laboratory of Functional and Metabolic Imaging, École polytechnique fédérale de Lausanne (EPFL), Lausanne, Switzerland, ²Center for Biomedical Imaging - Animal Imaging and Technology, École polytechnique fédérale de Lausanne (EPFL), Lausanne, Switzerland, ³Department of Radiology, University of Geneva, Geneva, Switzerland, ⁴Department of Radiology, University of Lausanne, Lausanne, Switzerland

Simultaneous EEG-fMRI offers rich multimodal information of brain activity. However, data quality is adversely affected by mutual interactions. Especially at higher magnetic fields, conductive scalp EEG components cause substantial transmit field disruption.

Here, electromagnetic field simulations and MR measurements at 7T performed on a realistic design of the wiring of a 64-channel EEG cap showed that transmit field attenuation and inhomogeneity are significantly reduced when wires are split into smaller lengths by resistors, suggesting a cancellation of resonant antenna effects. This offers an effective and practical solution to avoid EEG-induced MRI data degradation, maximizing the sensitivity benefits available at 7T.

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