title: Obtaining source current density related to irregularly structured electromagnetic target field inside human body using hybrid inverse/FDTD method.
abstract: Inverse method is inherently suitable for calculating the distribution of source current density related with an irregularly structured electromagnetic target field. However, the present form of inverse method cannot calculate complex field-tissue interactions. A novel hybrid inverse/finite-difference time domain (FDTD) method that can calculate the complex field-tissue interactions for the inverse design of source current density related with an irregularly structured electromagnetic target field is proposed. A Huygens' equivalent surface is established as a bridge to combine the inverse and FDTD method. Distribution of the radiofrequency (RF) magnetic field on the Huygens' equivalent surface is obtained using the FDTD method by considering the complex field-tissue interactions within the human body model. The obtained magnetic field distributed on the Huygens' equivalent surface is regarded as the next target. The current density on the designated source surface is derived using the inverse method. The homogeneity of target magnetic field and specific energy absorption rate are calculated to verify the proposed method.
authors.affiliation: a Department of Medical Engineering, School of Biomedical Engineering , Southern Medical University , Guangzhou , P. R. China.|b Guangdong Provincial Key Laboratory of Medical Image Processing, Southern Medical University , Guangzhou , P. R. China.
authors.forename: Jijun
authors.initials: J
authors.lastname: Han
authors.affiliation: c Department of Microwave Engineering, School of Electronic Engineering , University of Electronic Science and Technology of China , Chengdu , Sichuan , P.R. China.
authors.forename: Deqiang
authors.initials: D
authors.lastname: Yang
authors.affiliation: d School of Information and Electronics, Beijing Institute of Technology , Beijing , P. R. China.
authors.forename: Houjun
authors.initials: H
authors.lastname: Sun
authors.affiliation: a Department of Medical Engineering, School of Biomedical Engineering , Southern Medical University , Guangzhou , P. R. China.|b Guangdong Provincial Key Laboratory of Medical Image Processing, Southern Medical University , Guangzhou , P. R. China.
authors.forename: Sherman Xuegang
authors.initials: SX
authors.lastname: Xin
mesh_terms: D004553:Electric Conductivity; D004574:Electromagnetic Fields; D006801:Humans; D008954:Models, Biological; D011846:Radio Waves; D013997:Time Factors
keywords: Huygens’ equivalent surface; Inverse method; field–tissue interactions; finite-difference time domain method; specific energy absorption rate