Circular pole piece and MRI system

Electricity: magnetically operated switches – magnets – and electr – Magnets and electromagnets – Magnet structure or material

Reexamination Certificate

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C324S320000

Reexamination Certificate

active

06838966

ABSTRACT:
The object of the present invention is to minimize the residual magnetic induction in a circular pole piece included in a magnetic circuit for magnetic resonance imaging. A circular pole piece is divided into two portions, that is, a center portion and a marginal portion. A soft magnetic material that exhibits a high permeability (for example, 10000 or more) with a relatively small external magnetic field (for example, ranging from 20 A/m to 60 A/m) applied thereto is adopted as a soft magnetic material to be made into a center-portion laminate block. A soft magnetic material that exhibits a high permeability (for example, 6000 or more) with a relatively large external magnetic field (for example, ranging from 50 A/m to 150 A/m) applied thereto is adopted as a soft magnetic material to be made into a marginal-portion laminate block103b. Consequently, since the residual magnetic induction in the circular pole piece can be minimized, the degradation in image quality attributable to a residual magnetic induction can be prevented.

REFERENCES:
patent: 4042898 (1977-08-01), Tomita et al.
patent: 4753822 (1988-06-01), Van Mensvoort
patent: 5317297 (1994-05-01), Kaufman et al.
patent: 5363078 (1994-11-01), Ries et al.
patent: 5680086 (1997-10-01), Allis et al.
patent: 6127825 (2000-10-01), Goto
patent: 6150819 (2000-11-01), Laskaris et al.
patent: 6218834 (2001-04-01), Goto
patent: 2000-185023 (2000-07-01), None
patent: 2000-200716 (2000-07-01), None

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