Electricity: magnetically operated switches – magnets – and electr – Magnets and electromagnets – Magnet structure or material
Patent
1995-06-16
1996-10-08
Picard, Leo P.
Electricity: magnetically operated switches, magnets, and electr
Magnets and electromagnets
Magnet structure or material
324318, G01V 300
Patent
active
055635679
ABSTRACT:
A gradient coil system for the production of a magnetic transverse gradient field G.sub.x in an NMR tomograph is presented. The main magnetic field B.sub.z is directed along the z-axis, the magnetic transverse gradient field G.sub.x along the x-axis, and the gradient coil system comprises four partial coils (S.sub.1x, S.sub.2x, S.sub.3x, S.sub.4x) each with two current connections (A.sub.1, A.sub.2). The coils are arranged mirror symmetrically with respect to the xy-plane (z=0) and mirror symmetrically with respect to the zy-plane and each partial coil contains only winding sections on an inner and an outer cylinder Z.sub.ix, Z.sub.ax about the z-axis as well as in a radial connecting plane V.sub.+x, V.sub.-x parallel to the xy-plane. The partial coils are configured in such a fashion that the winding sections on the inner and outer cylinder Z.sub.ix, Z.sub.ax are axially further removed from the xy-plane than the corresponding radial connecting planes V.sub.+x, V.sub.-x, and the axial separation d.sub.Vx of the connecting planes V.sub.+x, V.sub.-x from each other is less than the radial separation d.sub.Zx between the inner and the outer cylinder Z.sub.ix, Z.sub.ax. In this fashion a nearly perfect outward shielding is achieved.
REFERENCES:
patent: 5198769 (1993-03-01), Frese et al.
patent: 5378989 (1995-01-01), Barber et al.
patent: 5414360 (1995-05-01), Westphal et al.
Barrera Raymond M.
Bruker Analytische Messtechnik GmbH
Picard Leo P.
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