Work

Protons and neutrons in the atomic nucleus behave like small spinning magnets. Accordingly, atoms and molecules assume a certain orientation in a magnetic field. This can be dislodged, however, by radio waves of certain frequencies that are characteristic for different atoms. By introducing variations in the magnetic field during the 1970s, Paul Lauterbur contributed to use of the phenomenon to create images of the human body's interior. The incidence of hydrogen atoms is measured and differences in the water content of different tissues provides a basis for magnetic resonance imaging.