Electricity: measuring and testing – Particle precession resonance
Reexamination Certificate
2006-05-30
2006-05-30
Shrivastav, Brij B. (Department: 2859)
Electricity: measuring and testing
Particle precession resonance
C324S306000
Reexamination Certificate
active
07053610
ABSTRACT:
Nuclear magnetic resonance (NMR) signals are detected in microtesla fields. Prepolarization in millitesla fields is followed by detection with an untuned dc superconducting quantum interference device (SQUID) magnetometer. Because the sensitivity of the SQUID is frequency independent, both signal-to-noise ratio (SNR) and spectral resolution are enhanced by detecting the NMR signal in extremely low magnetic fields, where the NMR lines become very narrow even for grossly inhomogeneous measurement fields. MRI in ultralow magnetic field is based on the NMR at ultralow fields. Gradient magnetic fields are applied, and images are constructed from the detected NMR signals.
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Clarke John
McDermott Robert
Pines Alexander
Trabesinger Andreas Heinz
Milner Joseph R.
Shrivastav Brij B.
The Regents of th University of California
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