An inverse, current density mapping (CDM) method has been developed for the
design of elliptical cross-section MRI magnets. The method provides a rapi
d prototyping system for unusual magnet designs, as it generates a 3D curre
nt density in response to a set of target field and geometric constraints.
The emphasis of this work is on the investigation of new elliptical coil st
ructures for clinical MRI magnets. The effect of the elliptical aspect rati
o on magnet performance is investigated. Viable designs are generated for s
ymmetric, asymmetric and open architecture elliptical magnets using the new
method. Clinically relevant attributes such as reduced stray field and lar
ge homogeneous regions relative to total magnet length are included in the
design process and investigated in detail. The preliminary magnet designs h
ave several novel features.