Correction of artifacts caused by Maxwell terms in MR echo-plana

Details Correction of artifacts caused by Maxwell terms in MR echo-plana Correction of artifacts caused by Maxwell terms in MR echo-plana

1997-04-10

1999-02-09

Arana, Louis

Electricity: measuring and testing

Particle precession resonance

Using a nuclear resonance spectrometer system

324307, G01V 300

Patent

active

058699651

ABSTRACT:
A method for correcting Maxwell field induced distortion, ghosting, and blurring artifacts in non-axially oriented EPI images is disclosed. In one embodiment phase corrections are calculated and used to offset Maxwell term errors during the image reconstruction process, and in another embodiment corrections are made after the image is reconstructed.

REFERENCES:
patent: 4876509 (1989-10-01), Perlmutter
patent: 5351006 (1994-09-01), Sumanaweera et al.
patent: 5642047 (1997-06-01), Bernstein
Lai, "Reconstructing NMR images under magnetic fields with large inhomogeneities" J. Phys. E: Sci. Instrum., vol. 15, pp. 1093-1100, 1982.
Weis et al., "Simulation of the Influence of Magnetic Field Inhomogeneity and Distortion Correction in MR Imaging" Magnetic Resonance Imaging vol. 8, pp. 483-489, 1990.

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