title: An improved cylindrical FDTD method and its application to field-tissue interaction study in MRI.
abstract: This paper presents a three dimensional finite-difference time-domain (FDTD) scheme in cylindrical coordinates with an improved algorithm for accommodating the numerical singularity associated with the polar axis. The regularization of this singularity problem is entirely based on Ampere's law. The proposed algorithm has been detailed and verified against a problem with a known solution obtained from a commercial electromagnetic simulation package. The numerical scheme is also illustrated by modeling high-frequency RF field-human body interactions in MRI. The results demonstrate the accuracy and capability of the proposed algorithm.
authors.affiliation: School of Automation Engineering, Qingdao University, China. chijieru@yahoo.com.cn
authors.forename: Jieru
authors.initials: J
authors.lastname: Chi
authors.forename: Feng
authors.initials: F
authors.lastname: Liu
authors.forename: Ling
authors.initials: L
authors.lastname: Xia
authors.forename: Tingting
authors.initials: T
authors.lastname: Shao
authors.forename: David G
authors.initials: DG
authors.lastname: Mason
authors.forename: Stuart
authors.initials: S
authors.lastname: Crozier
mesh_terms: D000465:Algorithms; D001921:Brain / Q000502:physiology* / Q000528:radiation effects*; D003198:Computer Simulation; D004574:Electromagnetic Fields; D006801:Humans; D007089:Image Enhancement / Q000379:methods; D007090:Image Interpretation, Computer-Assisted / Q000379:methods*; D021621:Imaging, Three-Dimensional / Q000379:methods*; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008959:Models, Neurological; D015203:Reproducibility of Results; D012542:Scattering, Radiation; D012680:Sensitivity and Specificity