Magnetisk Resonans - Biomedicinsk Teknik - Aarhus Universitet

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Magnetisk Resonans - Biomedicinsk Teknik - Aarhus Universitet

Precessing of nuclear spins in a magnetic

field (Bloch & Purcell Nobel price, 1946)

Spinning nuclei acts like very small bar

magnets because they have a magnetic

momentum due the spinning charges (magnetic

dipole). When an external field is applied the

population of spins splits in two: parallel and

antiparallel to the applied field (the proton 1 H

have spin ½ which gives two allowed energy

levels).

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