Editing Signal separation (section)

===Medical imaging===
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 field]]s outside the head which yield an accurate 3D-picture of the interior of the head. However, external sources of [[electromagnetic field]]s, 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.