Electricity: measuring and testing – Particle precession resonance – Spectrometer components
Patent
1999-12-06
2000-08-08
Oda, Christine K.
Electricity: measuring and testing
Particle precession resonance
Spectrometer components
324309, 600410, G01V 300
Patent
active
061006955
ABSTRACT:
A localized shim coil (34) for use in a magnetic resonance imaging system includes a plurality of conductive elements (22a-d). The plurality of conductive elements (62a-d) are connected to a current source (64). The plurality of conductive elements (62a-d) are arranged adjacent to a localized region of a subject being imaged such that current flowing through the conductive elements generates a localized magnetic field. A plurality of series connected choke and resister pairs (66a-d) and (68a-d), respectively, are connected to the plurality of conductive elements (62a-d). The chokes (66a-d) present high impedance to currents having frequencies substantially the same as a resonant frequency of the magnetic resonance imaging system. The resisters (68a-d) balance the current flowing through each conductive element (62a-d). The localized magnetic field is generated such that it is substantially equal and opposite to localized non-uniformities generated in the magnetic resonance system's main magnetic field by the subject's geometric shape and magnetic susceptibility in the localized region being imaged.
DeMeester Gordon D.
Morich Michael A.
Oda Christine K.
Picker International Inc.
Shrivastav Brij B.
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