https://airwiki.elet.polimi.it/index.php?title=How_to_mount_electrodes&feed=atom&action=historyHow to mount electrodes - Revision history2024-03-29T02:34:14ZRevision history for this page on the wikiMediaWiki 1.25.6https://airwiki.elet.polimi.it/index.php?title=How_to_mount_electrodes&diff=4521&oldid=prevTizianoDalbis: /* Links */2008-10-18T07:43:01Z<p><span dir="auto"><span class="autocomment">Links</span></span></p>
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</table>TizianoDalbishttps://airwiki.elet.polimi.it/index.php?title=How_to_mount_electrodes&diff=4520&oldid=prevTizianoDalbis: /* Links */2008-10-18T07:41:49Z<p><span dir="auto"><span class="autocomment">Links</span></span></p>
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<tr><td class='diff-marker'>−</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;">* [[How to mount electrodes]] </del></div></td><td colspan="2"> </td></tr>
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</table>TizianoDalbishttps://airwiki.elet.polimi.it/index.php?title=How_to_mount_electrodes&diff=4519&oldid=prevTizianoDalbis at 07:41, 18 October 20082008-10-18T07:41:34Z<p></p>
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<td colspan='2' style="background-color: white; color:black; text-align: center;">Revision as of 07:41, 18 October 2008</td>
</tr><tr><td colspan="2" class="diff-lineno" id="L57" >Line 57:</td>
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<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>Values under 10 KOhm are acceptable, values under 5 KOhm are very good.</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>Values under 10 KOhm are acceptable, values under 5 KOhm are very good.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>If your values aren’t under 10KOhm try to decrease them, filling the electrodes with more conductive gel until you reach acceptable values.</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>If your values aren’t under 10KOhm try to decrease them, filling the electrodes with more conductive gel until you reach acceptable values.</div></td></tr>
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<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">* [[Brain-Computer Interface]] page on this Wiki</ins></div></td></tr>
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</table>TizianoDalbishttps://airwiki.elet.polimi.it/index.php?title=How_to_mount_electrodes&diff=4512&oldid=prevTizianoDalbis: New page: == Before starting == You’ll nedd: * Electroencephalograph (with PCMCIA connector) * Laptop (ensures that the AC adapter is NOT connected, for safety reasons) * Electrodes or an E...2008-10-18T07:31:08Z<p>New page: == Before starting == You’ll nedd: * Electroencephalograph (with PCMCIA connector) * Laptop (ensures that the AC adapter is NOT connected, for safety reasons) * Electrodes or an E...</p>
<p><b>New page</b></p><div>== Before starting ==<br />
<br />
You’ll nedd:<br />
<br />
* Electroencephalograph (with PCMCIA connector)<br />
* Laptop (ensures that the AC adapter is NOT connected, for safety reasons)<br />
* Electrodes or an Electrodes Cap (designed for the 10-20 system)<br />
* Conductive gel and/or abrasive electrode-gel<br />
* Tape measure to put in the correct position the electrodes<br />
* Adhesive tape (if using single electrodes to fix them)<br />
* Syringe (if using electrodes cap, to insert the conductive gel into the electrodes hole)<br />
* Fototransistor (if necessary)<br />
<br />
Before starting, be sure that the Electroencephalograph AC adapter is far away from the patient because 50Hz can interfere and destroy EEG signal.<br />
Mobile phones can be another source of noise: it is better to switch them off before while performing the acquisition.<br />
In order to acquire the brain signal, it is possible to use an electrodes cap, or a set of separated single electrodes.<br />
<br />
<br />
== Mounting the electrodes' cap ==<br />
<br />
Choose the suitable size for the patient, and then put the cap on his head in the correct position:<br />
<br />
* measure his head size (from the nasion NS to the inion) this is the 100% of the measure<br />
* now you can put the CZ electrode at 50% of the entire measure, and check the positions of the other electrodes (i.e. FP1 and FP2 should be at 10% of the measure from nasion) .<br />
* fill in the electrodes with conductive gel (use the syringe), take care that hair don’t disturb the skin-electrode contact.<br />
* remember to fill with condutictive gel also to electrodes cabled in red (NE=Neutral Electrode) and green (ISOGND=Isolated Ground) that are used respectively as reference (RF) and ground values in the measurements.<br />
* connect the cable to the Electroencephalograph.<br />
<br />
<br />
== Mounting separeted electrodes ==<br />
<br />
If you haven’t got an electrodes cap you can position them one by one following this figure, with the relatives measures of each electrode:<br />
<br />
[[Image:10-20System.jpg]]<br />
<br />
<br />
Connect the reference electrode to the forehead and the GND electrode to the right earlobe.<br />
Before connecting one electrode, put a little bit of abrasive gel on a cotton fioc and scratch the portion of patient’s skin where you’ll put the electrode.<br />
Fill in the electrode with a little bit of conductive gel, and put it on the skin, in the correct position.<br />
Fix the cable with adhesive tape, and connect it to the Electroencephalograph.<br />
<br />
<br />
== Mounting electrodes for EOG ==<br />
<br />
If you want to eliminate EOG artefacts from your data acquisitions, you would record EOG signal putting 2 more electrodes, near the patient eye.<br />
One electrode just over the eyebrow and one under the eye (REF) , like in the picture:<br />
<br />
[[Image:ElectrodesEyes.png]]<br />
<br />
Connect the EOG cables to the A-Channel of the Electroencephalograph.<br />
<br />
<br />
== Impedance check ==<br />
<br />
Now you can start Galileo Software and check if the correct values of impedance are measured.<br />
Click on the button “OHMMETER” in the upper toolbar, and the system will display the calculated value for each electrode, both in “graphical” form and in “numerical” one.<br />
Values under 10 KOhm are acceptable, values under 5 KOhm are very good.<br />
If your values aren’t under 10KOhm try to decrease them, filling the electrodes with more conductive gel until you reach acceptable values.</div>TizianoDalbis