Electricity: measuring and testing – Particle precession resonance – Using a nuclear resonance spectrometer system
Patent
1987-11-23
1989-05-23
Tokar, Michael J.
Electricity: measuring and testing
Particle precession resonance
Using a nuclear resonance spectrometer system
G01R 3320
Patent
active
048334073
ABSTRACT:
A spin echo (52) and a gradient echo (60) are generated in each magnetic resonance sequence repetition. The spin echo is phase encoded by a phase encode gradient (44) in regular steps spanning about a quarter of k-space. More particularly, steps from -n to G.sub.max /2, where n is a small integer and G.sub.max is the maximum phase encode gradient. An off-set phase encode gradient (58) shifts the phase encoding of the gradient echo by G.sub.max /2 relative to the first phase encoding gradient. Data to fill the empty portions of k-space (142, 167) between -n and -G.sub.max are generated from the complex conjugate (140, 160), of the first echo data (74) and the second echo data (76). The first and second echo data and the complex conjugate data are transformed (122, 132, 146, 166) to generate parted image representations (124, 134, 148, 168). The first echo image representation and the corresponding conjugately symmetric image representation are phase corrected (126, 150) in accordance with a phase map ( 112) derived from the central most first echo data (78). The partial image representations are summed (170) to produce a resultant image representation (172).
REFERENCES:
patent: 4689567 (1987-08-01), Maudsley
patent: 4694251 (1987-09-01), Yoshitome et al.
patent: 4728893 (1988-03-01), Feinberg
patent: 4733188 (1988-03-01), Sekihara et al.
patent: 4748410 (1988-05-01), Macovski
"Faster MR Imaging: Imaging with Half the Data" by Margosian, et al., Health Care Instrumentation, vol. 1, No. 6, 1986, pp. 195-197.
"Faster MR Imaging--Imaging with Half the Data" by Paul Margosian, Society of Magnetic Resonance in Medicine, 4th Annula Meeting, Aug. 19-23, 1986, London, pp. 1024-1025.
"Field Inhomogeneity Correction and Data Processing for Spectroscopic Imaging" by Maudsley, et al., Magnetic Resonance in Medicine, 2, 1985, pp. 218-233.
"Direct Fourier Transform NMR Tomography with Modified Kumar-Welti-Ernst (MKWE) Method" by Song, et al., IEEE Transactions on Nuclear Scie nce, vol. NS-29, No. 1, Feb. 1982.
"Magnetic Field Measurement by NMR Imaging" by Maudsley, et al., The Institute of Physics, 1982, pp. 216-220.
"A New Method of Measuring Statis Field Distribution Using Modified Fourier NMR Imaging" by Sekihara, et al., The Institute of Physics, 1985, pp. 224-227.
"MR Images from on Quarter of the Data: Combination of Half Fourier Methods with a Linear Recursive Data Extrapolation" by P. Margosian, Book of Abstracts, Society of Mag. Res. In Medicine, Annual Meeting, Aug. 1987.
"RARE Imaging: A Fast Imaging Method for Clinical MR" by Henning, et al., Mag. Res. in Medicine, 3, pp. 823-833 (1986).
"Phase Encoded, Rapid, Multiple Echo (PERME) Nuclear Magnetic Resonance Imaging" by Lawton, Aug. 1985.
"Exploiting the Stimulated Echo in NMR Imaging" by Sattin, for NVR, Picker Clinical Science Center, vol. 2, No. 1, Feb. 1987, pp. 18-21.
DeMeester Gordon D.
Denison Kenneth S.
Holland G. Neil
Provost Terrence J.
Fess Lawrence G.
Picker International Inc.
Tokar Michael J.
LandOfFree
Scan time reduction using conjugate symmetry and recalled echo does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Scan time reduction using conjugate symmetry and recalled echo, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Scan time reduction using conjugate symmetry and recalled echo will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1732801