JPH0616756B

A method of separating fat and water proton NMR images in the presence of local magnetic field inhomogeneities uses three images acquired with pi , 0, and - pi phase shift between the water and fat signals. A switch function is developed from the argument of the combined images to unambiguously iden...

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Bibliographische Detailangaben
Hauptverfasser:	ERIKA SHUNAIDAA, GARII HARORUDO GUROOBAA
Format:	Patent
Sprache:	eng
Schlagworte:	CALCULATING COMPUTING COUNTING DATA PROCESSING SYSTEMS OR METHODS, SPECIALLY ADAPTED FORADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL, SUPERVISORYOR FORECASTING PURPOSES DIAGNOSIS ELECTRIC DIGITAL DATA PROCESSING HUMAN NECESSITIES HYGIENE IDENTIFICATION IMAGE DATA PROCESSING OR GENERATION, IN GENERAL MEASURING MEASURING ELECTRIC VARIABLES MEASURING MAGNETIC VARIABLES MEDICAL OR VETERINARY SCIENCE PHYSICS SURGERY SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE,COMMERCIAL, FINANCIAL, MANAGERIAL, SUPERVISORY OR FORECASTINGPURPOSES, NOT OTHERWISE PROVIDED FOR TESTING
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Beschreibung
Zusammenfassung:	A method of separating fat and water proton NMR images in the presence of local magnetic field inhomogeneities uses three images acquired with pi , 0, 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.