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.