NMR imaging system using field compensation

Details NMR imaging system using field compensation NMR imaging system using field compensation

1983-03-18

1987-08-11

Howell, Kyle L.

Surgery

Truss

Pad

324309, 324314, A61B 504

Patent

active

046854681

ABSTRACT:
NMR imaging is achieved in the presence of temporal variations in the magnetic field. The volume is excited using broadband excitation. A signal is picked up in the plane of interest, using a small coil, and used to determine the frequency of the subsequent plane-selecting excitation. A similar coil can be used to pick up the signal used to image the plane using projections all in the same direction. This latter signal is used to provide the demodulation signals to decompose the selected plane into its constituent elements. In both cases, involving the excitation and decoding signals, drifts in the magnetic field are compensated for.

REFERENCES:
patent: 4329646 (1982-05-01), Tsuda
patent: 4417209 (1983-11-01), Hounsfield
patent: 4418316 (1983-11-01), Young et al.
patent: 4425547 (1984-01-01), Sugimoto

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