Method of correcting the phase and shading in a nuclear magnetic

Details Method of correcting the phase and shading in a nuclear magnetic Method of correcting the phase and shading in a nuclear magnetic

1986-02-20

1987-12-15

Tokar, Michael J.

Electricity: measuring and testing

Particle precession resonance

Using a nuclear resonance spectrometer system

324309, G01R 3320

Patent

active

047136146

ABSTRACT:
A method of simultaneously correcting distortion in density due to uneven sensitivity of receiving coils, and location dependent phase distortion inherent in the system, wherein a phantom is scanned to determine echo signals, which echo signals are subjected to 2-dimensional inverse Fourier transformation, to obtain an image (Cij) and stored as it is in the form of a complex number, then the object to be examined is measured by similar operation to obtain an image (Oij) and wherein the image (Oij) is divided by computation with image (Cij) as follows .vertline.Sij.vertline.=.vertline.Oij.vertline./.vertline.Cij.vertline., by which equation computation is made to correct for density distortion, and wherein the angle of deviation is set as follows arg [Sij]=arg[Oij]-arg[Cij].ident.0, by which equation computation is made to correct for phase distortion. An image of the object is thus obtained which is corrected for density distortion and for phase distortion, by taking the real number part of the image Sij which is the determined image of the object.

REFERENCES:
patent: 4425547 (1984-01-01), Sugimoto
patent: 4585992 (1986-04-01), Maudsley
patent: 4591789 (1986-05-01), Glover
patent: 4599565 (1986-07-01), Hoenninges

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