Pediatrics in Review
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(Pediatrics in Review. 1986;8:87-92.)
© 1986 American Academy of Pediatrics
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Magnetic Resonance Imaging

Alan S. Brody MD1
Charles A. Gooding MD2
 1 Resident of Radiology and Pediatrics and Executive Vice Chairman, Department of Radiology, University of California School of Medicine, San Francisco, CA 94143-0628
2 Professor of Radiology and Pediatrics and Executive Vice Chairman, Department of Radiology, University of California School of Medicine, San Francisco, CA 94143-0628

Magnetic resonance imaging is the newest of the imaging modalities available for the diagnosis of diseases of children. No ionizing radiation is used and most studies are performed without the administration of contrast material.

FUNDAMENTALS OF MAGNETIC RESONANCE IMAGE FORMATION

Physics

The physics of magnetic resonance imaging is only accurately explained by complex mathematics, but analogy can serve as a rough guide. When placed in a strong magnetic field, atomic nuclei containing odd numbers of protons and neutrons align along the lines of magnetic force. The magnetic fields used are in the range of 6,000 to 15,000 G. (The earth's magnetic field measures 5 G.) Although many kinds of nuclei can be used, current magnetic resonance imaging systems image hydrogen nuclei.






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Pediatrics Pediatrics in Review
Copyright © 1986 by the American Academy of Pediatrics.