Electricity: measuring and testing – Particle precession resonance – Using a nuclear resonance spectrometer system
Patent
1990-11-13
1992-05-05
Tokar, Michael J.
Electricity: measuring and testing
Particle precession resonance
Using a nuclear resonance spectrometer system
324307, G01R 3320
Patent
active
051111446
ABSTRACT:
The invention relates to a magnetic resonance tomography method where a plurality of sequences act on an object to be examined in the presence of a steady, uniform magnetic field, each of said sequences including the generating of a magnetic rf pulse in conjunction with a first magnetic gradient field and the reading of a spin resonance signal in the presence of a second magnetic gradient field having a gradient extending perpendicularly to the gradient of the first field, an image of the nuclear magnetization distribution being reconstructed from the spin resonance signals by Fourier transformation. In order to produce a survey image therefrom in an as short as possible period of time, the object to be examined is displaced during the examination in the direction of the gradient of the first magnetic gradient field, the image of the nuclear magnetization distribution being line-wise reconstructed by way of a one-dimensional Fourier transformation of the spin resonance signal each time obtained.
REFERENCES:
patent: Re33279 (1990-07-01), Wehrli
patent: 4480228 (1984-10-01), Bottomley
patent: 4587489 (1986-05-01), Wehrli
patent: 4803432 (1989-02-01), Perman
P. R. Locher, "Proton NMR Tomography", Philips Technical Review, vol. 41, No. 3, 1983/84, pp. 73-88.
Slobod Jack D.
Tokar Michael J.
U.S. Philips Corp.
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