Electricity: measuring and testing – Particle precession resonance – Using a nuclear resonance spectrometer system
Reexamination Certificate
2007-12-18
2007-12-18
Gutierrez, Diego (Department: 2859)
Electricity: measuring and testing
Particle precession resonance
Using a nuclear resonance spectrometer system
Reexamination Certificate
active
11385338
ABSTRACT:
Methods for providing practical magnetic resonance imaging systems that utilize non-homogeneous background fields, B0, as well as, possibly non-linear, gradient fields G1, G2to make non-invasive measurements to determine, among other things, a spin density function. Two types of non-homogeneous background fields are considered: background fields B0in which the function |B0| does not have a critical point within the field of view, and background fields B0such that the function |B0| has a single critical point within the field of view. In the first case, an MR-imaging device may be constructed by using the permanent gradient in the background field, B0, as a slice select gradient, so long as particular criteria are met. In the second case, magnets may be constructed so that |B0| has an isolated non-zero local minimum. Using selective excitation, one can excite only the spins lying in a small neighborhood of this local minimum.
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Epstein Charles L.
Magland Jeremy
Gutierrez Diego
The Trustees of the University of Pennsylvania
Vargas Dixomara
Woodcock & Washburn LLP
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