Nmr gradient field modulation

Details Nmr gradient field modulation Nmr gradient field modulation

G - Physics

01

R

324/1

G01R 33/24 (2006.01) G01R 33/385 (2006.01)

Patent

CA 1232015

NMR GRADIENT FIELD MODULATION ABSTRACT A circuit and method are disclosed for providing high, constant amplitude sinusoidally modulated NMR gradi- ent fields. A capacitor is connected in parallel with the gradient coil, but separated by a switch. A pre-determined amount of energy is stored in the capacitor and then the switch is closed to permit a sinusoidal oscillation of energy between the capacitor and gradient coil. By pre- charging appropriately, sine wave or cosine wave oscilla- tion can be obtained for the NMR system. The oscillation is terminated by opening the switch at a time when all of the oscillating energy is in the capacitor. In a preferred embodiment of the invention, the switch is a bridge cir- cuit, each of whose sides is a back-to-back thyristor pair, so that the gradient field may be modulated either as a full wave, half-wave rectified or non-rectified sinusoidal oscillation. In one embodiment, a full-wave rectified sine wave is used, and all the oscillating energy is caught in the capacitor during intervals in which 180° RF pulses are applied to generate echoes. Image data is collected during the sinusoidal oscillation.

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