Electricity: measuring and testing – Particle precession resonance – Spectrometer components
Patent
1994-04-29
1995-06-27
Arana, Louis
Electricity: measuring and testing
Particle precession resonance
Spectrometer components
335296, G01V 300
Patent
active
054282926
ABSTRACT:
A pancake magnetic resonance imaging (MRI) magnet having a superconductive coil assembly including a toroidal-shaped coil housing containing a superconductive main coil set and a radially spaced-apart superconductive supplemental coil set. The main coil set includes a first main coil located radially towards the circumferential outside surface which faces away from the bore, and the supplemental coil set includes three radially spaced-apart supplemental coils located radially towards the circumferential outside surface which faces towards the bore. The first main coil and the middle supplemental coil each carry an equal electric current in a first direction while the other two supplemental coils each carry the same electric current in the opposite direction. Such coil arrangement produces an imaging volume longitudinally wider than the longitudinal thickness of the magnet. By adding a sufficient number of additional main coils and by longitudinally offsetting certain coils, the spherical imaging volume may be changed to a longitudinally offset ellipsoidal imaging volume. Such imaging volumes are better designed for breast imaging.
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Dorri Bizhan
Laskaris Evangelos T.
Arana Louis
Erickson Douglas E.
General Electric Company
Webb II Paul R.
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