Electricity: measuring and testing – Particle precession resonance – Spectrometer components
Reexamination Certificate
2007-05-03
2009-12-15
Shrivastav, Brij B (Department: 2831)
Electricity: measuring and testing
Particle precession resonance
Spectrometer components
C324S309000
Reexamination Certificate
active
07633293
ABSTRACT:
Technology for controlling non-uniformity in the B1field includes selecting the phase, magnitude, frequency, time, or spatial relationship among various elements of a multi-channel excitation coil in order to control the radio frequency (RF) power emanating from the coil antenna elements. Non-uniformity can be used to steer a constructively interfering B1field node to spatially correlate with an anatomic region of interest. A convex (quadratically constrained quadratic problem) formulation of the B1localization problem can be used to select parameters for exciting the coil. Localization can be used in simulated Finite Difference Time Domain B1field human head distributions and human head phantom measurement.
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Gopinath Anand
Olson Christopher C.
Vaughan J. Thomas
Crompton Seager & Tufte LLC
Regents of the University of Minnesota
Shrivastav Brij B
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