Electricity: measuring and testing – Particle precession resonance – Using a nuclear resonance spectrometer system
Patent
1992-05-06
1993-08-03
Gregory, Bernarr E.
Electricity: measuring and testing
Particle precession resonance
Using a nuclear resonance spectrometer system
324307, G01R 3320
Patent
active
H00012181
ABSTRACT:
A method for obtaining a nuclear magnetic resonance image of a sample is performed by first placing the sample in a homogeneous static magnetic field excited with a homogeneous transmitter device. Spin magnetization in the sample is thus initially detected with an inhomogeneous receiver device such that an induced voltage in the receiver device depends on a spatial location of precessing nuclei in the sample. Then, a spatial coupling of the sample and the receiver device is varied and the spin magnetization in the sample is again detected with the inhomogeneous receiver device. The full spatial distribution of the spin density of the sample and hence an image of the sample is then determined with the spin magnetizations detected. Either the sample is moved relative to the receiver device, or the spatial coupling of the receiver device and the sample is electronically altered. Any spin interactions are eliminated by using coherent averaging techniques before the detecting steps. In addition, during the varying step, the spin magnetization is either: left in the transverse plane; stored along the static magnetic field direction; allowed to equilibrate along the static magnetic field direction; or spin locked.
REFERENCES:
patent: 4301410 (1981-11-01), Wind et al.
patent: 4442404 (1984-04-01), Bergmann
patent: 4609872 (1986-09-01), O'Donnell
patent: 4654593 (1987-03-01), Ackerman
patent: 4947120 (1990-08-01), Frank
"NMR Imaging of Solids with a Spatially Selective Receiver Coil", Measurement Science & Technology, vol. 1, pp. 1338-1342, Nov. 1990; Cory et al.
Cory David G.
Garroway Allen N.
Miller Joel B.
Edelberg Barry A.
Gregory Bernarr E.
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