Electricity: measuring and testing – Particle precession resonance – Using a nuclear resonance spectrometer system
Patent
1991-07-24
1993-09-07
Tokar, Michael J.
Electricity: measuring and testing
Particle precession resonance
Using a nuclear resonance spectrometer system
324307, G01R 3320
Patent
active
052432840
ABSTRACT:
The acquisition of radial lines in 2-D Fourier space (k-space) allows the realization of the extremely short echo times useful in the imaging of short-T.sub.2 species and flow using Magnetic Resonance (MR). The disadvantage of this imaging method, which is also known as projection reconstruction, is that in order to prevent aliasing at a given resolution, .pi. times as many excitations are required as the conventional 2-D Fourier transform or spin-warp acquisition. Disclosed is an acquisition and reconstruction method that reduces the required number of radial lines and excitations by using the properties that projections are real or have slowly varying phase and the at radial acquisition methods are oversampled at the center of k-space. This method preserves resolution while reducing imaging time at the expense of signal-to-noise ratio (SNR). This has been verified with both phantom and human subjects.
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Board of Trustees of the Leland Stanford Junior University
Mah Raymond Y.
Tokar Michael J.
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