Electricity: measuring and testing – Particle precession resonance – Spectrometer components
Patent
1987-05-11
1989-03-14
Levy, Stewart J.
Electricity: measuring and testing
Particle precession resonance
Spectrometer components
324318, 36457102, G01R 3320
Patent
active
048127655
ABSTRACT:
A method is provided for adjusting the homogeneity correctors of the magnetic field created by a magnet. In the invention an analytic expression of the field is calculated in the form of a breakdown into spherical harmonics. Similar breakdowns into spherical harmonics are also calculated but relative to the field created by each of the correction means available for correcting this field. Then an algebraic combination is made of the analytic expressions of the correction means so as to produce a correction analytic expression which, added to the analytic expression of the real field, transforms it into an analytic expression corresponding to an ideal magnetic field. Then the correction means are adjusted as a function of the parameters of the algebraic combination.
REFERENCES:
patent: 4656447 (1987-04-01), Keim et al.
patent: 4680551 (1987-07-01), O'Donnell et al.
Magnetic Resonance in Medicine, vol. 1, No. 1, Mar. 1984, pp. 44-65, Academic Press, Inc., New York, U.S.; F. Romeo et al, "Magnet Field Profiling: Analysis and Correcting Coil Design."
Centre National de la Recherche Scientifique
Levy Stewart J.
O'Shea Kevin D.
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