[Magnetic resonance--historical and theoretical basis]. / Magnetisk resonans--historikk og teoretisk grunnlag.
Tidsskr Nor Laegeforen
; 120(8): 931-5, 2000 Mar 20.
Article
en Nor
| MEDLINE
| ID: mdl-10795498
Magnetic resonance (MR) imaging is a fast developing modality that has become an indispensable diagnostic tool at numerous disease states. The first MR imager in Norway was installed in 1986; by the end of 1999 Norway will have a total of 39 units, approximately one unit per 114,000 inhabitants. MR technique uses radiowaves and magnetic fields, and no ionising radiation is involved. Imaging is based on the fact that all biological tissues are magnetized when placed in a strong, static magnetic field. Short radiofrequency pulses set the tissue magnetic vector into rotation, and the vector induces electric currents in a receiver coil. The electric signals are spatially encoded by means of magnetic field gradients, thus enabling image reconstruction by means of Fourier transformation. The signal intensities can be made dependent on several tissue parameters, thus creating several unique image contrast possibilities.
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Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Imagen por Resonancia Magnética
Límite:
Humans
País/Región como asunto:
Europa
Idioma:
Nor
Revista:
Tidsskr Nor Laegeforen
Año:
2000
Tipo del documento:
Article
Pais de publicación:
Noruega