title: Performance of convolutional PML absorbing boundary conditions in finite-difference time-domain SAR calculations.
abstract: The performance of perfectly matched layer (PML) absorbing boundary conditions is studied for finite-difference time-domain (FDTD) specific absorption rate (SAR) assessment, using convolutional PML (CPML) implementation of PML. This is done by investigating the variation of SAR values when the amount of free-space layers between the studied object and PML boundary is varied. Plane-wave exposures of spherical and rectangular objects and a realistic human body model are considered for testing the performance. Also, some results for dipole excitation are included. Results show that no additional free-space layers are needed between the numerical phantom and properly implemented CPML absorbing boundary, and that the numerical uncertainties due to CPML can be made negligibly small.
authors.affiliation: Electromagnetics Laboratory, Helsinki University of Technology, Otakaari 5 A, 02150 Espoo, Finland. ilkka.laakso@tkk.fi
authors.forename: Ilkka
authors.initials: I
authors.lastname: Laakso
authors.forename: Sami
authors.initials: S
authors.lastname: Ilvonen
authors.forename: Tero
authors.initials: T
authors.lastname: Uusitupa
mesh_terms: D001822:Body Burden; D003198:Computer Simulation; D004574:Electromagnetic Fields; D020342:Finite Element Analysis; D006801:Humans; D008954:Models, Biological; D011834:Radiation Monitoring / Q000379:methods*; D011846:Radio Waves; D012062:Relative Biological Effectiveness; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity