US 4,398,150 AGranted

Ironless high-homogenety magnet and its application to nuclear magnetic resonance imaging

AssigneeThomson-CSF

InventorsYves M. Barjhoux, Herve Saint Jalmes, Jacques R. Taquin

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Abstract

The magnet essentially comprises at least three pairs of coaxial coils in order to increase the number of available parameters, to reduce the non-uniformity B.sub.d, to provide an examination volume with a double access consisting of a longitudinal access along the axis of revolution Oz and of a transverse access parallel to the plane of symmetry, to minimize the overall size as well as the dissipated electric power. The nine principal characteristic parameters of the coils are chosen so as to optimize the uniformity of the magnetic field within the examination volume.

Claims6

Dependent claims

An ironless magnet having high field uniformity comprising an even number of electromagnetic coils of revolution which are symmetrical with respect to a plane of symmetry at right angles to their axis of revolution, each coil being defined by its characteristic parameters:

its excitation current NI,
its means radius R,
the distance d between said coil and the plane of symmetry;
said magnet comprises at least two pairs of coils for increasing the number of available parameters and reducing the non-uniformity B.sub.b of the magnetic field;
said coils defining an examination volume with a double access consisting of a longitudinal access along the axis of revolution and of a transverse access parallel to the plane of symmetry, thereby reducing the overall size and also the dissipated electric power of said magnets.

2 more elements

Dependencies are inferred from the claim text.