Electricity: measuring and testing – Particle precession resonance – Spectrometer components
Patent
1991-02-22
1992-10-20
Tokar, Michael J.
Electricity: measuring and testing
Particle precession resonance
Spectrometer components
324318, G01R 3320
Patent
active
051573300
ABSTRACT:
A measure of magnetic field inhomogeneity along a phase-encoded (e.g. y-axis) dimension is derived in k-space from previously acquired MRI phase-encoded projection data. From this, a measure of MRI data skewing caused by such inhomogeneity is obtained and used to compensate therefor. Since the MRI data is to be multi-dimensionally Fourier Transformed in most instances anyway, a transform in the relevant phase encoded dimension (e.g., y-axis) is taken followed with phase shifting each digitized data point by an amount proportional to the measured magnitude of inhomogeneity and to the datum coordinate in the read-out dimension (e.g., x-axis) and to the datum coordinate in each phase-encode dimension (e.g., y-axis) before the data is further Fourier Transformed with respect to the read-out dimension (e.g., x-axis). If two-dimensional phase encoding is employed (e.g., as in 3DFT), then a second level of similar inhomogeneity compensation can be had in the third dimension (e.g., z-axis) as well.
REFERENCES:
patent: 4797616 (1989-01-01), Matsui et al.
patent: 4818942 (1989-04-01), Rzedzian
patent: 4855910 (1989-08-01), Bohning
patent: 4857843 (1989-08-01), Macovski
patent: 4876508 (1989-10-01), Taylor
patent: 4940941 (1990-07-01), Rzedzian
Carlson Joseph W.
Hale James D.
Kaufman Leon
Kramer David M.
Yee Kingman
The Regents of the University of California
Tokar Michael J.
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