Electricity: measuring and testing – Particle precession resonance – Using a nuclear resonance spectrometer system
Patent
1987-04-27
1988-10-11
Tokar, Michael J.
Electricity: measuring and testing
Particle precession resonance
Using a nuclear resonance spectrometer system
324318, G01R 3320
Patent
active
047774380
ABSTRACT:
Gradients are caused across a magnetic field in an image region by gradient field coils (22). A transmitter (30) causes an RF antenna (32) to generate excitation pulses to excite selected dipoles from the image region to resonance. A first receiving coil (50) and a second receiving coil (52) are disposed along the gradient to receive magnetic resonance signals from first and second fields of view (102, 104) within the image region. First and second phase sensitive detectors (70, 72) demodulate the magnetic resonance signals at different frequencies. Analog-to-digital converters (80, 82, 84, 86) digitize magnetic resonance signal components from the phase sensitive detectors to provide digital data for reconstruction by Fourier transform circuits (90, 92). By interconnecting each of the receiving coils with one of the phase sensitive detectors, two of the analog-to-digital converters, and one of the Fourier transform circuits, two images each corresponding to one of the fields of view can be generated concurrently. Alternately, a single receiving coil may provide a single magnetic resonance signal which is split among the phase sensitive detectors and the analog-to-digital converters. In this manner, parallel and processing channels are provided to reduce the noise by the square root of two.
REFERENCES:
patent: 4623843 (1986-11-01), Macovski
patent: 4665368 (1987-05-01), Sugiyama
patent: 4668915 (1987-05-01), Daubin
patent: 4691163 (1987-09-01), Blass et al.
Nuclear Magnetic Resonance Imaging by Partain, et al., W. B. Saunders Company, 1983, pp. 128-151.
NMR in Medicine: The Instrumentation and Clinical Applications, edited by Thomas, et al., published for the American Assoc. of Physicists in Medicine, Medical Physics Monograph No. 14, pp. 166-179.
"Nuclear Magnetic Resonance NMR Imaging" edited by Partain et al., 1983, pp. 128-151.
Picker International Inc.
Tokar Michael J.
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