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Neuronavigation: EM tracking vs optical tracking
If neuronavigation is to be used to guide a TMS coil to a certain brain region, it is essential to know the 3D positions and angles of the TMS coil, the head of the patient, and a digitizing stylus at all times. Tracking these positions can be done either using optical position tracking in which large cameras on stand are needed, or by making use of electromagnetic (EM) position tracking based on a DC pulsed magnetic field emitted by a small box. Based on scientific research it is to be said that navigation accuracy beween optical and EM tracking is identical.
Whereas both of these techniques can succesfully be used, certain advantages are to be found in favour of the EM tracking. Read more about the benefits of electromagnetic tracking here.