Development of realistic high-resolution whole-body voxel models of Japanese adult males and females of average height and weight, and application of models to radio-frequency electromagnetic-field dosimetry.

With advances in computer performance, the use of high-resolution voxel models of the entire human body has become more frequent in numerical dosimetries of electromagnetic waves. Using magnetic resonance imaging, we have developed realistic high-resolution whole-body voxel models for Japanese adult males and females of average height and weight. The developed models consist of cubic voxels of 2 mm on each side; the models are segmented into 51 anatomic regions. The adult female model is the first of its kind in the world and both are the first Asian voxel models (representing average Japanese) that enable numerical evaluation of electromagnetic dosimetry at high frequencies of up to 3 GHz. In this paper, we will also describe the basic SAR characteristics of the developed models for the VHF/UHF bands, calculated using the finite-difference time-domain method.

[1]  G. Mur.  Absorbing Boundary Conditions for the Finite-Difference Approximation of the Time-Domain Electromagnetic-Field Equations , 1981, IEEE Transactions on Electromagnetic Compatibility.

[2]  C. R. Richmond.  ICRP Publication 23 , 1985 .

[3]  Om P. Gandhi,et al.  The ANSI Radio Frequency Safety Standard: Its Rationale and Some Problems , 1987, IEEE Engineering in Medicine and Biology Magazine.

[4]  G Drexler,et al.  The construction of computer tomographic phantoms and their application in radiology and radiation protection , 1988, Radiation and environmental biophysics.

[5]  [Japanese Reference Man 1988-III. Masses of organs and tissues and other physical properties]. , 1988, Nihon Igaku Hoshasen Gakkai zasshi. Nippon acta radiologica.

[6]  G. Tanaka,et al.  [Japanese reference man 1988-IV. Studies on the weight and size of internal organs of Normal Japanese]. , 1989, Nihon Igaku Hoshasen Gakkai zasshi. Nippon acta radiologica.

[7]  J. E. Tanner,et al.  An extended tabulation of effective dose equivalent from neutrons incident on a male anthropomorphic phantom. , 1993, Health physics.

[8]  P. Dimbylow,et al.  SAR calculations in an anatomically realistic model of the head for mobile communication transceivers at 900 MHz and 1.8 GHz. , 1994, Physics in medicine and biology.

[9]  Icrp.  Human Respiratory Tract Model for Radiological Protection , 1994 .

[10]  O. Gandhi,et al.  Electromagnetic absorption in the human head and neck for mobile telephones at 835 and 1900 MHz , 1996 .

[11]  C Gabriel,et al.  The dielectric properties of biological tissues: I. Literature survey. , 1996, Physics in medicine and biology.

[12]  C. Gabriel.  Compilation of the Dielectric Properties of Body Tissues at RF and Microwave Frequencies. , 1996 .

[13]  M. Stuchly,et al.  A study of the handset antenna and human body interaction , 1996 .

[14]  Osamu Fujiwara,et al.  Characteristics of the SAR distributions in a head exposed to electromagnetic fields radiated by a hand-held portable radio , 1996 .

[15]  R. W. Lau,et al.  The dielectric properties of biological tissues: II. Measurements in the frequency range 10 Hz to 20 GHz. , 1996, Physics in medicine and biology.

[16]  R. W. Lau,et al.  The dielectric properties of biological tissues: III. Parametric models for the dielectric spectrum of tissues. , 1996, Physics in medicine and biology.

[17]  P. Dimbylow.  FDTD calculations of the whole-body averaged SAR in an anatomically realistic voxel model of the human body from 1 MHz to 1 GHz. , 1997, Physics in medicine and biology.

[18]  M A Stuchly,et al.  A comparison of 60 Hz uniform magnetic and electric induction in the human body. , 1997, Physics in medicine and biology.

[19]  J. Herbertz.  Comment on the ICNIRP guidelines for limiting exposure to time-varying electric, magnetic, and electromagnetic fields (up to 300 GHz) , 1998, Health physics.

[20]  A. Ahlbom.  Guidelines for limiting exposure to time-varying electric, magnetic, and electromagnetic fields (up to 300 GHz) , 1998 .

[21]  D. G. Jones.  A Realistic Anthrompomorphic Phantom for Calculating Specific Absorbed Fractions of Energy Deposited from Internal Gamma Emitters , 1998 .

[22]  P. A. Mason,et al.  Recent Advancements in Dosimetry Measurements and Modeling , 2000 .

[23]  Osamu Fujiwara,et al.  FDTD Analysis of Dosimetry in Human Head Model for a Helical Antenna Portable Telephone , 2000 .

[24]  A. Bozkurt,et al.  VIP-MAN: AN IMAGE-BASED WHOLE-BODY ADULT MALE MODEL CONSTRUCTED FROM COLOR PHOTOGRAPHS OF THE VISIBLE HUMAN PROJECT FOR MULTI-PARTICLE MONTE CARLO CALCULATIONS , 2000, Health physics.

[25]  X. Xu,et al.  Conversion coefficients based on the VIP-Man anatomical model and EGS4. , 2001, Health physics.

[26]  M Zankl,et al.  Construction of a computed tomographic phantom for a Japanese male adult and dose calculation system , 2001, Radiation and environmental biophysics.

[27]  P. Dimbylow,et al.  Fine resolution calculations of SAR in the human body for frequencies up to 3 GHz. , 2002, Physics in medicine and biology.