title: Active shielding of cylindrical saddle-shaped coils: application to wire-wound RF coils for very low field NMR and MRI.
abstract: We provide an exact expression for the magnetic field produced by cylindrical saddle-shaped coils and their ideal shield currents in the low-frequency limit. The stream function associated with the shield surface current is also determined. The results of the analysis are useful for the design of actively shielded radio-frequency (RF) coils. Examples pertinent to very low field nuclear magnetic resonance (NMR) and magnetic resonance imaging (MRI) are presented and discussed.
authors.affiliation: Department of Physics, Simon Fraser University, Burnaby, BC, Canada. cpbidino@sfu.ca
authors.forename: C P
authors.initials: CP
authors.lastname: Bidinosti
authors.forename: I S
authors.initials: IS
authors.lastname: Kravchuk
authors.forename: M E
authors.initials: ME
authors.lastname: Hayden
mesh_terms: D004574:Electromagnetic Fields; D004867:Equipment Design; D008279:Magnetic Resonance Imaging / Q000295:instrumentation*; D009682:Magnetic Resonance Spectroscopy / Q000295:instrumentation*; D008433:Mathematics; D019047:Phantoms, Imaging; D011846:Radio Waves