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US 7,403,009 B2Granted
Magnetic gradient winding system comprising circular solenoid coils
AssigneeCommissariat a l'Energie Atomique
InventorGuy Aubert
Life of this patent
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Abstract
In order to produce field strength gradients (x,y) for a NMR machine, the curve-shaped gradients are substituted by coils arraigned in tubes. Said tubes are distributed on the annular circumference (6) of the examination space of the tunnel NMR machine. Said invention makes it possible to produce at request field strength gradients in all necessary directions by providing each tube with the same set of coil elements and supplying them with selected currents.
Claims23
An NMR machine of the circular cylindrical type comprising:
- a cylindrical annular space for accommodating devices for generating a magnetic field gradient, characterized in that these generating devices comprise circular solenoidal coils whose diameter is inscribed within a thickness of the annular space and whose axis is parallel to the direction of the main field,
- the solenoid coils generating a first field gradient (X) in a first radial direction of the machine and a second field gradient (Y) in a second radial direction of the machine, the first direction being perpendicular to the second direction;
- and
- a plurality of amplifiers for simultaneously supplying the solenoidal coils with an algebraic sum of currents corresponding to the first and second field gradients (X,Y).
1 more element
Dependencies are inferred from the claim text.