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

Volume

29

Issue

4

fYear

1993

fDate

7/1/1993 12:00:00 AM

Firstpage

2139

Lastpage

2151

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;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.221037

Filename

221037