Electricity: measuring and testing – Particle precession resonance – Spectrometer components
Patent
1998-08-28
2000-11-14
Arana, Louis
Electricity: measuring and testing
Particle precession resonance
Spectrometer components
324319, 335296, G01V 300
Patent
active
061474959
ABSTRACT:
A magnetic resonance imaging scanner includes a pair of opposing pole pieces (20, 20') disposed symmetrically about an imaging volume (24) facing one another. The pair of opposing pole pieces (20, 20') includes a first ferrous pole piece (20) which has a front side (22) facing the imaging volume (24) and a back side (28). Also included is a second ferrous pole piece (20') which also has a front side (22) facing the imaging volume (24) and a back side (28). A magnetic flux return path (30) extends, remotely from the imaging volume (24), between a point adjacent the back side 28 of the first pole piece (20) and a point adjacent the back side 28' of the second pole piece (20)'. A source of magnetic flux generates a magnetic flux through the imaging volume (24), the pair of opposing pole pieces (20, 20'), and the magnetic flux return path (30). An array of annular hoops (40) and (40') are integrated with the pair of opposing pole pieces (20, 20') for homogenizing the magnetic flux through the imaging volume (24). The annular hoops (40, 40') are made of a material having magnetic properties different from those of the pair of opposing pole pieces (20, 20').
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DeMeester Gordon D.
McGinley John V. M.
Young Ian R.
Arana Louis
Picker International Inc.
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