Method for correcting position deviation due to static magnetic

Details Method for correcting position deviation due to static magnetic Method for correcting position deviation due to static magnetic

1987-10-28

1988-12-06

Tokar, Michael J.

Electricity: measuring and testing

Particle precession resonance

Spectrometer components

324309, G01R 3320

Patent

active

047898330

ABSTRACT:
An NMR imaging device comprises a circuit for applying a static magnetic field to an object to be examined, a circuit for applying gradient magnetic fields to the object, a circuit for applying radio frequency pulses to the object to cause nuclear magnetic resonance (NMR) in atomic nuclei of atoms constituting tissue of the object, a circuit for detecting the NMR signals thus generated, and means for Fourier-transforming the NMR signals to reconstruct an NMR image. In this NMR imaging device, only a gradient magnetic field in the slice direction is applied to the object without applying a gradient magnetic field in the frequency encode direction and a gradient magnetic field in the phase encode direction, 90 degree and 180 degree radio frequency pulses are applied to the object at predetermined intervals, the NMR signals thus generated are detected and Fourier-transformed, and a static magnetic field intensity is detected from the resultant frequency spectrum to provide a suitable parameter for imaging, thereby providing the NMR image free from any position deviation.

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patent: 4720679 (1988-01-01), Patrick

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