Electricity: measuring and testing – Particle precession resonance – Using a nuclear resonance spectrometer system
Patent
1988-05-06
1990-07-10
Tokar, Michael J.
Electricity: measuring and testing
Particle precession resonance
Using a nuclear resonance spectrometer system
324307, G01R 3320
Patent
active
RE0332593
ABSTRACT:
An imaging NMR scanner obtains plural spin echo signals during each of successive measurement cycles permitting determination of the T2 parameter for each display pixel after but a single measurement sequence. The amplitude of the NMR spin echo responses is dependent on an "a" machine parameter (the elapsed time between initiation of a given measurement cycle and the occurrence of the NMR response) and upon a "b" machine parameter (the elapsed time between initiation of successive measurement cycles). These a and b machine time parameters are selectively controlled to enhance resultant image contrast between different types of tissue or other internal structures of an object under examination. Special phase control circuits ensure the repeatability of relative phasing between successive NMR responses from the same measured volume and/or of reference RF signals utilized to frequency translate and synchronously demodulate the NMR responses in the successive measurement cycles of a complete measurement sequence. Special sub-sequences of four measurement cycles are utilized to provide resultant combined spin echo measurements substantially independent of FID signal components.
REFERENCES:
patent: 3651396 (1972-03-01), Hewitt
patent: 4115730 (1978-09-01), Mansfield
patent: 4322684 (1982-03-01), Hounsfield
patent: 4458203 (1984-07-01), Young
In Vivo Imaging of the Rat Anatomy with Nuclear Magnetic Resonance, Hansen et al, Radiology 136, Sep. 1980, pp. 695-700.
Tomography of Hydrogen with Nuclear Magnetic Resonance, Crooks et al, Radiology 136, Sep. 1980, pp. 701-706.
J. Phys. E.: Sci. Instrum., vol. 13 (1980), pp. 697-707.
"Biological and Medical Imaging by NMR" by Mansfield et al, Journal of Magnetic Resonance 29 (1978), pp. 355-373 (particularly pp. 363-367).
"Effects of Diffusion on Free Precession in Nuclear Magnetic Resonance Experiments" by Carr et al, Physical Review 94, vol. 94, No. 3, May 1, 1954, pp. 630-638 (see FIG. 6).
Arakawa Mitsuaki
Crooks Lawrence E.
Hoenninger, III John C.
Singer Jerome R.
The Regents of the University of California
Tokar Michael J.
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