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One of the practical applications being researched in this area is medical imaging of the brain with magnetoencephalography ( MEG ).
This kind of imaging involves careful measurements of magnetic fields outside the head which yield an accurate 3D-picture of the interior of the head.
However, external sources of electromagnetic fields, such as a wristwatch on the subject's arm, will significantly degrade the accuracy of the measurement.
Applying source separation techniques on the measured signals can help remove undesired artifacts from the signal.

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