Method of decomposing NMR images by chemical species

Details Method of decomposing NMR images by chemical species Method of decomposing NMR images by chemical species

1990-08-10

1992-09-01

Tokar, Michael J.

Electricity: measuring and testing

Particle precession resonance

Using a nuclear resonance spectrometer system

G01R 3320

Patent

active

051442353

ABSTRACT:
A method of separating fat and water proton NMR images in the presence of local magnetic field inhomogeneities uses three images acquired with .pi., O, and -.pi. phase shift between the water and fat signals. A switch function is developed from the argument of the combined images to unambiguously identify the predominant chemical species of each pixel. Wrap arounds in the argument resulting from the limited range of trigonometric functions are treated first by subtracting a low order polynomial, fit to the phase image, to accentuate and remove wrap around discontinuities, and second by using trend analysis to detect and remove discontinuities caused by the wrap arounds.

REFERENCES:
patent: 4346716 (1982-08-01), Carr
patent: 4468621 (1984-08-01), Hinshaw
patent: 4806867 (1989-02-01), Hanawa
"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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