DC-STIMULATOR MR
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DC-STIMULATOR MR - 1

DC-STIMULATOR MR Measuring and Modulating Brain Activity Programmable direct and alternating current stimulator The DC-STIMULATOR MR combines the DC-STIMULATOR PLUS and the use for application in fMRI scanners. The DC-STIMULATOR PLUS is a stimulator for use in scientific research. It provides a stimulation with weak currents, either direct or alternating, (transcranial Electrical Stimulation - tES), within non-invasive Interventional Neurophysiology. The electrical charge and current density applied through a constant current source are far below the threshold for releasing a stimulus. Depending on the duration, the used current, the current density, and the frequency the stimulation has a modular effect on existing neuronal elements by either activating or inhibiting cortical activity. The DC-STIMULATOR MR allows to apply tES during functional magnetic resonance imaging (fMRI) to localize the exact position of cortical activation. Advantages of the DC-STIMULATOR MR: • highest patient safety standards due to multistage monitoring of the current path, automatic termination of the stimulation as well as continuous monitoring of the electrode impedance • intuitive menu navigation via display and four buttons • individual stetting and saving of the stimulation parameters • programmable treatment schedule and limited menu access* • study mode for double-blind active and sham stimulation* • signal output for online-correction of the EEG signal during tDCS or tACS/tRNS* *

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DC-STIMULATOR MR - 2

DC-STIMULATOR MR technical specifications • adjustable current (DC) up to 4,500 μA in increments of 25 μA • adjustable current (AC) up to 3,000 μA (peak-to-peak) • additional MRI protective resistor of approx. 5 kOhm in each electrode • internal 16bit D/A conversion • internal time resolution < 1 ms (sample rate 2,048 sps) • stimulation mode “tDCS“: duration 15-1,800 s, increment 15 s, duration of fade in / fade out 1-120 s, increment 1 s • stimulation mode “Pulse“: duration of complete pulse cycle/interstimulus interval (ISI) 300-2,000 ms, increment 100 ms, pulse width 200- (ISI100),...

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