Method and apparatus for MRI using selectively shaped image volu

Details Method and apparatus for MRI using selectively shaped image volu Method and apparatus for MRI using selectively shaped image volu

1993-03-18

1996-02-13

Kamm, William E.

Surgery

Truss

Pad

324318, 324309, A61B 5055

Patent

active

054905095

ABSTRACT:
An electromagnet shim coil is utilized for temporarily altering the shape of a volume in which there is provided a substantially homogeneous NMR polarizing field. By temporarily energizing the electromagnet shim coil and thus altering the shape of the volume, magnetic resonance imaging can take place in other than a substantially spherical volume (e.g., in an elongated ellipsoidal-like volume extending axially along a patient so as to encompass a longer section of the spinal column). In the exemplary embodiment, the electromagnet shim coil takes the form of a pancake-like coil with windings positioned so as to create fourth power spherical harmonic in a transverse magnet-type of MRI system.

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