Electricity: measuring and testing – Particle precession resonance – Spectrometer components
Patent
1993-11-04
1996-05-14
O'Shea, Sandra L.
Electricity: measuring and testing
Particle precession resonance
Spectrometer components
324307, G01R 3320
Patent
active
055171222
ABSTRACT:
Hybrid imaging (HI) sequences used for magnetic resonance (MR) imaging and inherently degraded by T2 effects and additive measurement noise are enhanced. Wiener filter and linear prediction (LP) technique is used to process HI MR signals in the spatial frequency domain (K-space) and the hybrid domain respectively. Based on the average amplitude symmetry constraint of the spin echo signal, the amplitude frequency response function of the T2 distortion is estimated and used in the Wiener filter for a global T2 amplitude restoration. Then a linear prediction technique is utilized to obtain local signal amplitude and phase estimates around discontinuities of the frequency response function of the equivalent T2 distortion filter. These estimates are used to make local amplitude and phase corrections. The effectiveness of this combined technique in correcting T2 distortion and reducing the measurement noise is analyzed and demonstrated using experiments on both phantoms and humans.
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Mah Raymond Y.
O'Shea Sandra L.
The Regents of University of California
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