title: Evaluation of 3D radio-frequency electromagnetic fields for any matching and coupling conditions by the use of basis functions.
abstract: A procedure for evaluating radio-frequency electromagnetic fields in anatomical human models for any matching and coupling conditions is introduced. The procedure resorts to the extraction of basis functions: such basis functions, which represent the fields produced by each individual port without any residual coupling, are derived through an algebraic procedure which uses the S parameter matrix and the fields calculated in one (only) full-wave simulation. The basis functions are then used as building-blocks for calculating the fields for any other S parameter matrix. The proposed approach can be used both for volume coil driven in quadrature and for parallel transmission configuration.
authors.affiliation: Imago7 Foundation, Pisa, Italy; IRCCS Stella Maris, Pisa, Italy. Electronic address: g.tiberi@iet.unipi.it.
authors.forename: Gianluigi
authors.initials: G
authors.lastname: Tiberi
authors.affiliation: Department of Information Engineering, Pisa, Italy.
authors.forename: Nunzia
authors.initials: N
authors.lastname: Fontana
authors.affiliation: Department of Information Engineering, Pisa, Italy.
authors.forename: Agostino
authors.initials: A
authors.lastname: Monorchio
authors.affiliation: Physics Department, Pisa, Italy.
authors.forename: Riccardo
authors.initials: R
authors.lastname: Stara
authors.affiliation: National Institute of Nuclear Physics (INFN), Pisa Branch, Italy.
authors.forename: Alessandra
authors.initials: A
authors.lastname: Retico
authors.affiliation: IRCCS Stella Maris, Pisa, Italy; Imago7 Foundation, Pisa, Italy.
authors.forename: Michela
authors.initials: M
authors.lastname: Tosetti
mesh_terms: D000465:Algorithms; D003198:Computer Simulation; D004574:Electromagnetic Fields; D006257:Head / Q000033:anatomy & histology; D006801:Humans; D008279:Magnetic Resonance Imaging; D008953:Models, Anatomic; D011846:Radio Waves
keywords: Electromagnetic RF fields; RF coils; RF full-wave simulations; Ultra high field magnetic resonance