71210 Bioelectromagnetism - Exercises Autumn 2004

Theory of Biomagnetic Measurements

1. Impressed current source generating magnetic field arises from
   1. external (noise) sources
   2. internal inhomogeneities and their boundaries
   3. magnetic material of the body
   4. cellular activity
2. Magnitude of magnetic signals in decreasing order is
   1. MEG, MCG, noise field, geomagnetic field
   2. noise field, geomagnetic field, MCG, MEG
   3. geomagnetic field, noise field, MCG, MEG
3. Lead field of magnetic lead is directed
   1. radially
   2. tangentially
4. When combining magnetic and electric measurements, the maximum number of independent components becomes
   1. 6
   2. 3
   3. something between 3 to 6

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