Nuclear magnetic resonance apparatus

Details Nuclear magnetic resonance apparatus Nuclear magnetic resonance apparatus

1981-05-19

1983-11-29

Tokar, Michael J.

Electricity: measuring and testing

Particle precession resonance

Using a nuclear resonance spectrometer system

324301, G01R 3308

Patent

active

044183160

ABSTRACT:
In nuclear magnetic resonance (NMR) imaging systems it is known to excite resonance in a slice of a body and then to sample the resonance signals in the presence of a field gradient across the slice. It has been proposed that the signals should be sampled at intervals such that there is equal field integral (for the field gradient) in each interval. It is now proposed to use outputs from two NMR probes in the slice and on opposite sides of the body. The phase difference between the two probes is measured and samples are taken when the phase difference reaches a predetermined value. Preferably the samples are taken when a gate detects zero-crossing of the output of a demodulator providing the phase difference. Two probes only may be rotated around the patient as the field gradient rotates or four may be used, two orthogonally disposed pairs and one or other appropriately weighted output used.

REFERENCES:
patent: 3274485 (1966-09-01), Denis et al.
patent: 3404332 (1968-10-01), Abragam
patent: 4209746 (1980-06-01), Abramov

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