Electricity: measuring and testing – Particle precession resonance – Spectrometer components
Patent
1993-05-26
1994-12-13
Wieder, Kenneth A.
Electricity: measuring and testing
Particle precession resonance
Spectrometer components
324318, G01R 3320
Patent
active
053732391
ABSTRACT:
The invention concerns a method for adjusting the desired current values of shim coils of a tesseral harmonic (off axis) shim system in order, in particular in the center of the shim system, to produce as homogeneous a magnetic field as possible. Utilizing a minimal number of measuring points and appropriate linear combinations of the corresponding measurement values with and without switching on the corresponding shim coil, a simple, systematic and reliable measurement method is introduced which does not require any iterative procedure. The method can be used by itself or the desired current values can serve as starting values for a further shimming procedure.
REFERENCES:
patent: 4284950 (1981-08-01), Burl et al.
patent: 4581580 (1986-04-01), Keim
patent: 4623844 (1986-11-01), Macovski
patent: 4652826 (1987-03-01), Yamamoto et al.
patent: 4761614 (1988-08-01), Prammer et al.
patent: 4862087 (1989-08-01), Hillenbrand et al.
patent: 5006804 (1991-05-01), Dorri et al.
Gwendolyn N. Chmurny and David I. Hoult, The Ancient and Honourable Art of Shimming, (Concepts in Magnetic Resonance, 1990, 2, 131-149).
Burgers Marcellus
Haberli Markus
Marek Daniel
Riboulet Jean-Claude
Bruker Analytische MeBtechnik GmbH
Hackler Walter A.
Mah Raymond Y.
Wieder Kenneth A.
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