Magnetic field inhomogeneity correction in MRI using estimated l

Details Magnetic field inhomogeneity correction in MRI using estimated l Magnetic field inhomogeneity correction in MRI using estimated l

1995-03-09

1997-04-01

O'Shea, Sandra L.

Electricity: measuring and testing

Particle precession resonance

Spectrometer components

324309, 1286532, G01R 3320

Patent

active

056170289

ABSTRACT:
A fast and robust method for correcting magnetic resonance image distortion due to field inhomogeneity is applied to spiral k-space scanning. The method includes acquiring a local field map, finding the best fit to a linear map, and using the linear field map to deblur the image distortions due to local frequency variations. The linear field map is determined using a maximum likelihood estimator with weights proportional to the pixel intensity. The method requires little additional computation and is robust in low signal regions and near abrupt field changes. The application of this method is illustrated in conjunction with a multi-slice, T2-weighted, breath-held spiral scan of the liver.

REFERENCES:
patent: 4661775 (1987-04-01), Kormos et al.
patent: 4720679 (1988-01-01), Patrick et al.
patent: 4761614 (1988-08-01), Prammer et al.
patent: 4797615 (1989-01-01), Rotem et al.
patent: 4875012 (1989-10-01), Maeda et al.
patent: 5157330 (1992-10-01), Kaufman et al.
patent: 5233992 (1993-08-01), Holt et al.
patent: 5343151 (1994-08-01), Cory et al.
Reese et al., Automated Shimming at 1.5T Using Echo-Planar . . . , Proc. of Soc. of Mag. Res. in Med., Aug. 14-20, 1993, p. 354.
Meyer et al., Fast Spiral Coronary Artery Imaging, Mag. Res. in Med., vol. 28, pp. 202-213, 1992.
Noll et al., Deblurring for Non-2D Fourier Transform Mag Res . . . Mag. Res. in Med., vol. 25, pp. 319-333, 1992.
Noll et al., Homogeneity Correction Method for Mag Res Imag . . . IEEE Trans. on Med. Img., vol. 10, No. 4, Dec. 1991, pp. 629-637.
Webb et al., Rapid, Fully Auto, Arbitrary-vol in vivo Shimming, Mag. Res. in Med., vol. 20, pp. 113-122, 1991.
Schneider et al., Rapid in vivo Proton Shimming, Mag. Res. in Med., vol. 18, pp. 335-347, 1991.
Maeda et al., Reducing Chem Shift Artifacts in MRI with Time . . . IEEE Trans. on Med. Img., vol. 8, No. 1, Mar. 1989, pp. 8-15.
Park et al., Fast Gradient-Echo Chem-Shifting Imaging, Mag. Res. in Med., vol. 7, pp. 340-345, 1988.
Maeda et al., Reconstruction by Weighted Correlation for MRI . . . IEEE Trans. on Med. Img., vol. 7, No. 1, Mar. 1988, pp. 26-31.
Yudilevich et al., Spiral Sampling in MRI--Effect of Inhomog . . . IEEE Trans. on Med. Img., vol. MI-6, No. 4, Dec. 1987, pp. 337-345.

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