Electricity: measuring and testing – Particle precession resonance – Spectrometer components
Patent
1993-03-11
1994-01-11
Tokar, Michael J.
Electricity: measuring and testing
Particle precession resonance
Spectrometer components
324322, G01V 300
Patent
active
052785041
ABSTRACT:
An examination region (12) is defined along a z-axis offset from a geometric center (30) of a gradient coil assembly (20). Cylinders of a non-conductive, non-magnetic material support x, y, and z-gradient coils (24, 26, 22) for causing orthogonal magnetic field gradients through the offset examination region. The z-gradient coil (FIG. 2 ) includes a plurality of distributed loop arrays with a winding pattern selected to cause a region of linear magnetic field gradients in the z-direction in a region offset toward a cylinder first end (32). The x and y-gradient coils each include two pairs of oppositely disposed windings (FIG. 3 ) which include a pair of inner spirals (96, 98) offset towards the first end of the cylinder and an outer spiral (90) extending therearound. The outer spiral bows in (92) toward the cylinder first end and fans out (94) toward the second end. In this manner, the x, y, and z-gradient coils create linear magnetic field gradients along x, y, and z-directions which have a region of primary linearity offset from their geometric center.
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P. Mansfield and P. G. Morris, "NMR Imaging in Biomedicine", Academic Press, 1982.
Hajnal J. V.
Hall A. S.
Morich Michael A.
Patrick John L.
Petropoulos Labros
Picker International Inc.
Tokar Michael J.
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