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Lauterbur PC. Nature 1973;242(5394):190–1
MRI in Clinical Medicine
Use of 2 fields: one interacting with the
object under investigation, the other
restricting this interaction to a small
region
Rotation of the fields relative to the
object produced a series of 1-D
projections of the interacting regions,
from which 2- or 3-D images of their
spatial distribution could be
reconstructed.
http://www.nature.com/physics/looking-back/