Magnetic resonance imaging apparatus and method...

Details Magnetic resonance imaging apparatus and method... Magnetic resonance imaging apparatus and method...

2006-04-18

2006-04-18

Shrivastav, Brij (Department: 2859)

Electricity: measuring and testing

Particle precession resonance

Spectrometer components

C324S309000

Reexamination Certificate

active

07030611

ABSTRACT:
A gradient coil or shield coil includes a first gradient coil part and a second gradient coil part having at least one different characteristic of (a) intensity of gradient magnetic field, (b) slew rate, (c) linearity and/or (d) changing rate of the magnetic field (as compared to characteristics of the first gradient coil part. In another aspect, a gradient coil includes a first portion close to a center of the gradient coil, a second portion which is outside of the first portion and which has a lower winding density than the first portion and a third portion which is outside of the second portion and which has a higher winding density than the second portion.

REFERENCES:
patent: 4737716 (1988-04-01), Roemer
patent: 5311135 (1994-05-01), Vavrek
patent: 5736858 (1998-04-01), Katznelson
patent: 6236208 (2001-05-01), Ham et al.
patent: 6501977 (2002-12-01), Kimmlingen
patent: 6794873 (2004-09-01), Brand et al.

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