Electricity: measuring and testing – Particle precession resonance – Spectrometer components
Patent
1997-11-03
1999-11-02
Arana, Louis
Electricity: measuring and testing
Particle precession resonance
Spectrometer components
324322, G01V 300
Patent
active
059777710
ABSTRACT:
A magnetic resonance imaging apparatus (10) has a main magnet having a pair of pole faces (16,18) defining an examination region (14). The main magnet generates a main magnetic field (12). A couch (30) suspends a subject within the examination region (14). A uniplanar gradient coil assembly (40) is positioned to one side of the subject. The uniplanar gradient coil assembly (40) generates magnetic field gradients across the examination region (14). The uniplanar gradient coil assembly (40) includes coil loop arrays each residing in a plane which is transverse to the main magnetic field (12). A current supply (42) supplies a electrical current pulses to the coil loop arrays. A radio frequency pulse generator (50) is employed for selectively exciting magnetic resonance of dipoles within the examination region (14). A receiver (54) receives magnetic resonance signals from the resonating dipoles and a reconstruction processor (62) forms an image representation from the magnetic resonance signals received. In one embodiment, the uniplanar gradient coil assembly (40) is housed within an interior of the couch (30) and a mechanical adjustment mechanism (70) adjusts the height of the uniplanar gradient coil assembly (40) to align the magnetic gradient region having optimum linearity with an area of interest of the subject.
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patent: 5402094 (1995-03-01), Enge
patent: 5555251 (1996-09-01), Kinanen
Actively Shielded Biplanar Gradient Set of Open Magnet Geometries With Vertically Directed Fields by L.S. Petropoulos.
Actively Shield Gradient Coils for Wrist Imaging by L.S. Petropoulos.
Planar Surface Gradient Coil by Z.H. Cho.
Arana Louis
Picker International Inc.
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