The DC-STIMULATOR MR* is an electrical stimulator for conducting research on non-invasive transcranial direct- and alternating current stimulation (tDCS, tACS) specifically during magnetic resonance imaging (f)MRI.
The DC-STIMULATOR MR* is a micro-processor-controlled constant current source. It meets the highest safety standards thanks to (hardware- and software-based) multistage monitoring of the current path. By continuously monitoring electrode impedance it can detect insufficient contact with the skin and automatically terminate stimulation.
1 channel, unipolar (DC) and bipolar (AC) stimulation
Adjustable range of current ±4,500 µA, maximum adjustable current strength ±1,500 µA (peak-to-peak)
Adjustable application time up to 30 minutes
Frequencies adjustable up to 250 Hz, phase freely adjustable
4 standard modes - single (continuous stimulation) - pulse (cyclical stimulation activation/deactivation) - sinus (sinus wave) - noise (normally distributed)
Use during fMRI, no interference of the MRI images during EPI sequence
RF filter module with MRI-compatible cables and electrodes
Customer-specific programs possible (optional)
"Study mode" for blind processing of genuine and 'pseudo' stimulation (optional)
External trigger input and output (optional)
| Internal 12bit D/A conversion | |
| Internal time resolution 1 ms (sample rate 1,280 sps) | |
| "Single" stimulation mode | duration 15-1,800 s, increment 15 s, duration of fade in/fade out 1-120 s, increment 1 s |
| "Pulse" stimulation mode | duration of complete pulse cycle/interstimulus interval (ISI) 300-2,000 ms, increment 100 ms, pulse width 200- (ISI-100), increment 100 s, number of pulse ccles 1-500 |
| "Sinus" stimulation mode | adjustable current up to 3,000 µA (p-p) in 25 µA increments, offset of 0 to ± 1,000 µA, increment 10 µA, frequencies up to 250 Hz, increment 0.01 Hz, adjustable phase 0-360º in 5º steps, application time adjustable up to 30 min |
| "Noise", "noise LF", "noise HF" stimulation mode | adjustable current up to ± 1,500 µA (p-p), offset of 0 up to ± 1.000 µA, increment 50 µA, duration 0-1,800 s in 5 s increments, current adjustable over period of 0-120 s to reach and leave oscillation level |
| Max. voltage limitation | ± 20V |
| Dimensions | 5.3″W x 8.9″D x 2.2″H |
| Weight (incl. batteries) | 1.8 lbs |
Items marked with* are investigational devices and for research use only. CAUTION - Investigational Device. Limited by Federal (or United States) law to investigational use.
Items marked with* are investigational devices and for research use only. CAUTION - Investigational Device. Limited by Federal (or United States) law to investigational use.
