Abstract
Recent 1 y- de vel oped , hi gh- resol ution Superconducting Quantum Interference Device (SQUID) magnetometers can provide magnetic images of small objects with a signal-to-noise ratio and spatial resolution that a re an order of magnitude better than is achievable with conventional magnetometers. If the magnetic fields are produced by a two-dimensional current distribution, Fourier-transfor m spatial filtering algorithms allow interpretation of the magnetic field maps in terms of current density images. The system can detect growth currents in a fertile chicken egg, and signals from a voluntarilyactivated single motor unit in the human thumb.
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