4D Neuroimaging Magnes 1300C (as of June 1997)

• detection coils: 67 magnetometers, Ø 36 mm
• sensor geometry: concave spherical surface, Ø 336 mm, rc 520 mm
• ambient noise detection: 6 magnetometers, 5 1st order gradiometers
• intrinsic noise: 10ft/vHz average over frequency and across all channels

4D Neuroimaging Homepage

 

 

Siemens Krenikon (July 1993 - January 1997)

• detection coils: 37 1st order gradiometers, Ø 24,5 mm
• sensor geometry: planar circular surface, Ø 190 mm
• intrinsic noise: 10ft/vHz at frequencies > 10Hz

 

 

 

 

Biosemi ANA-1 analog EEG/ECG-System

• 48 channels
• 0,16 - 1600 Hz bandwidth
• battery powered analog front-end
• optical fibers connect to digital circuitry outside the shielded room

Biosemi Homepage

 

Shielded room

• Vakuumschmelze AK3b
• shielding factor for magnetic fields > 800 at 1 Hz, > 40000 at 50 Hz
• shielding for electric fields > 80 dB between 10 kHz and 200 MHz