Electricity: measuring and testing – Particle precession resonance – Using a nuclear resonance spectrometer system
Patent
1985-12-03
1987-08-04
Levy, Stewart J.
Electricity: measuring and testing
Particle precession resonance
Using a nuclear resonance spectrometer system
324312, 324311, G01R 3320
Patent
active
046848908
ABSTRACT:
Process for the generation and processing of signals for obtaining a nuclear magnetic resonance image, which is free from distortions, from an inhomogeneous polarization field B=Bo+E(x,y,z) using known 2D,FT and 3D,FT image coding methods involving the application of a 90.degree. radiofrequency pulse in plane xOy, then a phase coding during time .tau. followed by frequency coding by applying, along Ox, a reading gradient during the acquisition of the free precession signal, which is then made to undergo Fourier transformations with respect to time and with respect to the gradient or gradients applied.
During a second series of sequences involving the successive application of the same gradients, the free precession system is subject to a second 180.degree. radiofrequency pulse at the start of establishing each reading gradient.
REFERENCES:
Cho et al., "Fourier Transform Nuclear Magnetic Resonance Tomographic Imaging", Proceedings of the IEEE, vol. 70, No. 10, Oct. 1982.
Lai, "Reconstructing NMR Images Under Magnetic Fields with Large Inhomogeneities", Journal of Physics E: Scientific Instruments, vol. 15, No. 10, Oct. 1982.
Sekihara et al., "Image Restoration from Non-Uniform Magnetic Field Influence for Direct Fourier NMR Imaging", Physics in Medicine and Biology, vol. 29, No. 1, Jan. 1984.
Briguet Andre
Goldman Maurice
Commissariat a l''Energie Atomique
Levy Stewart J.
O'Shea Kevin D.
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