title: New head models extracted from thermal infrared (IR) images for dosimetry computations.
abstract: In electromagnetic dosimetry, anatomical human models are commonly obtained by segmentation of magnetic resonance imaging or computed tomography scans. In this paper, a human head model extracted from thermal infrared images is examined in terms of its applicability to specific absorption rate (SAR) calculations. Since thermal scans are two-dimensional (2D) representation of surface temperature, this allows researchers to overcome the extensive computational demand associated with 3D simulation. The numerical calculations are performed using the finite-difference time-domain method with mesh sizes of 2 mm at 900 MHz plane wave irradiation. The power density of the incident plane wave is assumed to be 10 W/m(2). Computations were compared with a realistic anatomical head model. The results show that although there were marked differences in the local SAR distribution in the various tissues in the two models, the 1 g peak SAR values are approximately similar in the two models.
authors.affiliation: Universiti Teknologi Malaysia (UTM), Skudai, Johor, Malaysia. mecmsc@yahoo.com
authors.forename: Akram
authors.initials: A
authors.lastname: Gasmelseed
mesh_terms: D000465:Algorithms; D016000:Cluster Analysis; D020342:Finite Element Analysis; D006257:Head / Q000033:anatomy & histology*; D006801:Humans; D007259:Infrared Rays; D008953:Models, Anatomic