Electricity: measuring and testing – Particle precession resonance – Spectrometer components
Reexamination Certificate
2007-08-07
2007-08-07
Shrivastav, Brij (Department: 2859)
Electricity: measuring and testing
Particle precession resonance
Spectrometer components
C324S307000
Reexamination Certificate
active
11488595
ABSTRACT:
The method for removing noise from nuclear magnetic resonance signals and images involves removing noise from NMR signals through the application of stable linear time-frequency (SLTF) transforms. According to the method, a noise variance for a particular NMR signal is calculated and the NMR signal is sampled and digitized. A set of analysis samples that vary in the number of samples in frequency is selected so that each member of the set has a compact signal/image representation for at least one component according to the differing component relaxation times of the signal/image. Each member of the set is then processed by the SLTF to determine the transform coefficients, the coefficients are subjected to threshold value criteria to denoise the coefficients, and the inverse SLTF transform is computed for each member of the set to obtain the denoised signal. The member signals are then averaged to obtain the denoised NMR signal.
REFERENCES:
patent: 4463375 (1984-07-01), Macovski
patent: 4475084 (1984-10-01), Moore
patent: 4709212 (1987-11-01), MacFall
patent: 4728893 (1988-03-01), Feinberg
patent: 4814710 (1989-03-01), McKinnon
patent: 5051698 (1991-09-01), Ordidge
patent: 5113137 (1992-05-01), Koizumi
patent: 5463342 (1995-10-01), Guard
patent: 5517122 (1996-05-01), Chen
patent: 5545991 (1996-08-01), Nauerth
patent: 5587656 (1996-12-01), Van Heels-Bergen
patent: 5615676 (1997-04-01), Kohno
patent: 5655532 (1997-08-01), Yasugi
patent: 6071494 (2000-06-01), Unger
patent: 6078872 (2000-06-01), Carson
patent: 6377042 (2002-04-01), Menger
patent: 6486671 (2002-11-01), King
patent: 6537233 (2003-03-01), Rangayyan et al.
patent: 6600315 (2003-07-01), Heaton
patent: 7206459 (2007-04-01), Berkner et al.
patent: 2006/0056520 (2006-03-01), Comer et al.
patent: 3643577 (1988-06-01), None
patent: 0431216 (1991-06-01), None
patent: 61227424 (1986-10-01), None
Ahmed, O., “Fast computation of discrete SLTF transform,” Proceedings of the 11th IEEE Workshop on Statistical Signal Processing, Orchid Country Club, Singapore, Aug. 2001, pp. 317-320.
Ahmed, O. and Fahmy, M., “NMR signal enhancement via a new time-frequency transform,” IEEE Transactions on Medical Imaging, vol. 20, No. 10, Oct. 2001, pp. 1018-1025.
Litman Richard C.
Shrivastav Brij
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