Robust decomposition of NMR images by chemical species

Details Robust decomposition of NMR images by chemical species Robust decomposition of NMR images by chemical species

1991-06-20

1993-07-06

Arana, Louis

Electricity: measuring and testing

Particle precession resonance

Using a nuclear resonance spectrometer system

G01R 3320

Patent

active

052257819

ABSTRACT:
A method of separating fat and water proton NMR images in the presence of local magnetic field inhomogeneities uses multiple images with phase shift between the water and fat signals. The phase shifts need not be multiples of .pi. and are selected so that at least two images are not "fat opposed" and so that images are not symmetric in phase shift around a "fat aligned" image. A switch function is developed from the argument of the combined images to unambiguously identify the predominant chemical species of each voxel. Wrap arounds in the argument resulting from the limited range of trigonometric functions are treated first by subtracting a low order polynomial, then detecting and removing wrap around discontinuities.

REFERENCES:
patent: 5134372 (1992-07-01), Inoue
patent: 5144235 (1992-09-01), Glover et al.
patent: 5162737 (1992-11-01), Nozokido et al.
"Simple Proton Spectroscopic Imaging", W. Thomas Dixon, Radiology, 1984; 153; 189-194.
"Fatty Infiltration of the Liver: Demonstration by Proton Spectroscopic Imaging", Joseph K. T. Lee, et al, Radiology 1984; 1535; 195-201.

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