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Important safety aspects for combined MR recordings: BrainCap MR - the new design
fMRI compatible electrode cap. Based onour many years of experience, the new version of the BrainCap MR has been modified to be even more comfortable in scanner environments. Additional safety features have been implemented. Built-in resistors as well as protective tubing around long wires make it the safest cap for combined EEG & fMRI recordings.
?Electrodes must not touch the skin. Our new electrodes are pin type sensors which are placed inside a plastic holder mounted on the cap. The holder is filled with gel to reduce skin conductance and to establish a contact between the sensor and the subject‘s skin.
?Every electrode contains safety resistors between the sensor and the connection wire. Connection between the components is performed by gluing, not soldering.
?Additional safety resistors are placed inside the cap connector, acting like an additional RF-filter. ?Wires are located on the outside of the cap to ensure isolation between skin and wire according to FDA patient safety regulations (watch video on YouTube).
?High temperature isolating tubes around the ECG electrode cable avoid contact between skin and wire. ?ECG electrodes do contain higher resistors than normal electrodes to compensate for the technical characteristics of longer wires.
?All wires are fixed into the cap to avoid loops.
?Wire length from electrode to the amplifier input is fixed to a minimal required length.
?Wire outlets for the cable tree at central positions avoid loops due to cable routing.
?Extra electrodes (for e.g. EMG recordings) are surrounded by tubes to avoid contact between wire and skin as well as to avoid cable loops occurring by mistake.
?The new pin sensor design reduces the amount of Ag/AgCl in the cap.
?Reducing the number of extra electrodes hanging out of the cap reduces possible image artifacts.
?Wire outlets for the cable tree at central positions ensure short cable routing distances through the head coil.
?Extra flat electrode holders for extra comfort, especially when resting on electrodes.
?Extra spare electrode holders for extra comfort to compensate for gaps between electrodes especially when using less than 64-channels.
?Soft cap fabric to increase comfort and to widen the fit to accommodate different head sizes.
?Serial number sticker for easy tracking, assembly and layout questions.
?Colored electrode holders for easy access/clarification of assembly affiliation (e.g. 10-20, 10-10). ?Name labels on every electrode for easy recognition.
?Special gel adds electrode visualization capabilities (similar to vitamin E capsules).
What happens to old electrode caps that do not meet the current safety standards?
If you are sure that your scanner equipment has not changed and that scanner sequences and related procedures are exactly the same as when you first received your equipment, there is no urgent need to change your caps. Otherwise, after a couple of years of use it may be a good idea to adapt your equipment to the latest safety standards. Please verify if your scanner has been upgraded or sequences have been added by the manufacturer.
Additional safety instructions about scanner sequences, positioning of equipment and preventive measures can be found in our new BrainAmp MR manual available soon.
Safe recordings can only be assured by combining our BrainCap MR, BrainAmp MR and by adhering closely to our safety instructions. Please find safety instructions in the BrainAmp MR manual.