Method of measuring magnetic field error of an NMR imaging appar

Details Method of measuring magnetic field error of an NMR imaging appar Method of measuring magnetic field error of an NMR imaging appar

1987-07-10

1988-12-13

Levy, Stewart J.

Electricity: measuring and testing

Particle precession resonance

Using a nuclear resonance spectrometer system

324308, G01R 3320

Patent

active

047913690

ABSTRACT:
A method of finding error distribution in the static magnetic field and distribution of deviations from straight lines in the gradient magnetic fields of an NMR imaging apparatus which employs the applied spin-warp method. A phantom whose shape has been known is measured in the read-out gradient magnetic fields having different polarities to obtain two spin density distribution images. The two images are then compared with the shape of said phantom to measure the distortion distributions of the images. Error in the static magnetic field and deviations of the gradient magnetic fields from the straight lines are analyzed from the distortion distributions. From the thus obtained error distribution, furthermore, distortion induced in imaging the object is estimated, and the distortion contained in the image that is reconstructed from the spin density of the object by the spin-warp method is corrected using the thus estimated value.

REFERENCES:
patent: 4661775 (1987-04-01), Kormos et al.
patent: 4684889 (1987-08-01), Yamaguchi et al.
patent: 4713614 (1987-12-01), Hoshino et al.
Maudsley, A. A. et al., "Magnetic Field Measurement by NMR Imaging", J. Phys. E: Sci. Instrum., vol. 17, 1984.
Sekihara, K. et al., "A New Method . . . NMR Imaging", J. Phys. E: Sci. Instrum., vol. 18, 1985.

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