Title :
Systematic passive shimming of a permanent magnet for P-31 NMR spectroscopy of bone mineral
Author :
Battocletti, Joseph H. ; Kamal, Husain A. ; Myers, Thomas J. ; Knox, Thomas A.
Author_Institution :
Dept. of Veterans Affairs Med. Center, Milwaukee, WI, USA
fDate :
7/1/1993 12:00:00 AM
Abstract :
Passive shimming of a relatively low-cost, medium-size, permanent magnet employing neodymium-iron-boron magnet material by the appropriate addition of steel is described. The magnet is for a low-field (0.33 T, 5.688 MHz) 31P NMR spectrometer built for the measurement of bone mineral in the human wrist and heel. The fuzzy logic and expert system features of the computer program used to enhance the shimming are discussed. The shimming procedure is described, and results are discussed
Keywords :
biomedical NMR; bone; boron alloys; ferromagnetic properties of substances; iron alloys; molecular biophysics; neodymium alloys; nuclear magnetic resonance spectroscopy; permanent magnets; steel; 0.33 T; 5.688 MHz; NMR spectrometer; bone mineral; expert system; fuzzy logic; human heel; human wrist; passive shimming; permanent magnet; Bones; Building materials; Humans; Magnetic materials; Minerals; Nuclear magnetic resonance; Permanent magnets; Spectroscopy; Steel; Wrist;
Journal_Title :
Magnetics, IEEE Transactions on
