ANZIAM J.
43 (2002), 375386  
NMR shim coil design utilising a rapid spherical harmonic calculation method
 
 
Abstract  
A rapid spherical harmonic calculation method is
used for the design of Nuclear Magnetic Resonance
shim coils. The aim is to design each shim such
that it generates a field described purely by a
single spherical harmonic. By applying simulated
annealing techniques, coil arrangements are
produced through the optimal positioning of
currentcarrying circular arc conductors of
rectangular crosssection. This involves
minimizing the undesirable harmonics in relation
to a target harmonic. The design method is
flexible enough to be applied for the production
of coil arrangements that generate fields
consisting significantly of either zonal or
tesseral harmonics. Results are presented for
several coil designs which generate tesseral
harmonics of degree one.
 
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