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The MRI was originally called NMRI (nuclear magnetic resonance imaging), but nuclear was dropped to avoid negative associations. Certain atomic nuclei are able to absorb and emit radio frequency energy when placed in an external magnetic field. In clinical and research MRI, hydrogen atoms are most often used to generate a detectable radio-frequency signal that is received by antennas close to the anatomy being examined.

The branches of contemporary science associated with the study of human nature include anthropology, sociology, sociobiology, and psychology.

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