Patent ID: 7019525

Claim:
A magnetic field generator for producing a homogenous magnetic field region within a field of view, and being operable via electronics, the magnetic field generator comprising: a plurality of main magnet coils arranged in a cylindrical fashion and disposed within a magnet housing; a plurality of shielding coils arranged in a cylindrical fashion, and located radially outward of the plurality of magnets and within the magnet housing; and control electronics disposed with an electronics housing, the electronics housing being disposed outward of and proximal to the magnet housing: wherein the main magnet coils and shielding coils are configured to shape a magnetic field which comprises at least one low fringe field region when in operation, the at least one low fringe field region being at a location less than 2.5 meters radially from the center of the field of view and having a magnetic field strength low enough so as to not harm the electronics, the at least one low fringe field region including a region wherein the control electronics are located.