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Abstract #0695

Estimation of low frequency conductivity from Larmor frequency conductivity

Ulrich Katscher1, Christoph Leussler1, Nick Flaeschner1, and Fabian Wenzel1

1Philips Research, Hamburg, Germany

EEG source localization requires the conductivity map of the patient's head. Patient-individual conductivity maps can be measured in the framework of MRI using "Electric Properties Tomography" (EPT). However, EEG source localization requires the conductivity belonging to low frequency (LF) range instead radiofrequency (RF) range, as it is the case for EPT. To solve this problem, this study suggests two EPT measurements at different B0, and to transform the resulting conductivities from RF to LF via a simplified Cole-Cole-model. The approach has been validated with organic and non-organic phantoms as well as with volunteer brain experiments.

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