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Abstract #3958

Reducing Noise Artifacts in Intracranial EEG Within High Field MRI

Giorgio Bonmassar1, Alexandra Golby2

1AA Martinos Center, Massachusetts General Hospital, Charlestown, MA, United States; 2Neurosurgery and Radiology, Brigham and Womens Hospital, Boston, MA, United States

A new type of MRI compatible intracranial electrode based on Polymer Thick Film (PTF) is presented and studied. When free electrons in the leads are exposed to Lorentz forces due to the motion of the leads in the static magnetic field (B0) results in induced current noise which makes the electroencephalogram impossible to interpret. The resistive leads were compared with metallic leads to estimate the Faradays induced current noise. In metallic materials the carrier density is very high (10 22 electrons/cm -3) compared to resistive leads. The results show that PTF resistive leads may reduce by four times the noise amplitude.