Arrangements and method for shimming a magnetic field
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United States of America Patent
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Jan 29, 2013
Grant Date -
Sep 23, 2010
app pub date -
Mar 23, 2010
filing date -
Mar 23, 2009
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A shim arrangement for increasing the homogeneity of a magnetic field within a homogeneous field region, comprising: shim channels extending within a volume between a magnetic field generator and the homogeneous field region; at least one piece of shim material located within each shim channel; an arrangement for moving each shim piece along the corresponding shim channel; and retaining means for retaining each shim piece in position. Shimming is performed by moving shim pieces within the shim channels, with the magnet at field. No shim pieces are added to, or removed from, the shim channels during the shimming step.
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