Nuclear magnetic resonance apparatus and methods
AssigneeNational Research Development Corporation
InventorPeter Mansfield
Life of this patent
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Abstract
The nuclear magnetic resonance spin density distribution in a sample is obtained by subjecting the sample to a static magnetic field and exciting the sample with a selective or non-selective r.f. excitation pulse and a combination of magnetic field gradients which vary in directions along and orthogonal to the direction of the static field. One or more of the gradients are repetitively reversed to allow cyclic regrowth and decay of the free induction decay signal.
Claims21
A method of obtaining signals representing the nuclear magnetic resonance spin density distribution in a sample which comprises maintaining a static magnetic field along one axis of a sample, applying an excitation pulse to the sample, applying at least one magnetic field gradient to said magnetic field which varies in a direction selected from directions orthogonal to and parallel to said one axis and repetitively reversing the direction of one or more of the said at least one magnetic field gradient at a rate which allows cyclic regrowth and decay of the free induction decay (FID) signal from the sample, and reading out the resulting FID signal.
Apparatus for obtaining signals representing the nuclear magnetic resonance spin density distribution in a sample which comprises means for providing a static magnetic field along one axis of a sample, means for applying an excitation pulse to the sample, means for applying magnetic field gradients to said magnetic field which vary in directions along and orthogonal to the said one axis, means for repetitively reversing the direction of at least one magnetic field gradient and means for reading out the resulting free induction decay (FID) signal.
Dependencies are inferred from the claim text.