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Christ A, Kainz W, Hahn EG, Honegger K, Zefferer M, Neufeld E, Rascher W, Janka R, Bautz W, Chen J, Kiefer B, Schmitt P, Hollenbach HP, Shen J, Oberle M, Szczerba D, Kam A, Guag JW, Kuster N. |
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The Virtual Family--development of surface-based anatomical models of two adults and two children for dosimetric simulations. |
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2010 |
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Phys Med Biol. |
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55 |
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23-38 |
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The objective of this study was to develop anatomically correct whole body human models of an adult male (34 years old), an adult female (26 years old) and two children (an 11-year-old girl and a six-year-old boy) for the optimized evaluation of electromagnetic exposure. These four models are referred to as the Virtual Family. They are based on high resolution magnetic resonance (MR) images of healthy volunteers. More than 80 different tissue types were distinguished during the segmentation. To improve the accuracy and the effectiveness of the segmentation, a novel semi-automated tool was used to analyze and segment the data. All tissues and organs were reconstructed as three-dimensional (3D) unstructured triangulated surface objects, yielding high precision images of individual features of the body. This greatly enhances the meshing flexibility and the accuracy with respect to thin tissue layers and small organs in comparison with the traditional voxel-based representation of anatomical models. Conformal computational techniques were also applied. The techniques and tools developed in this study can be used to more effectively develop future models and further improve the accuracy of the models for various applications. For research purposes, the four models are provided for free to the scientific community. |
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CNR-ISIB @ paolo.ravazzani @ |
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148 |
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A Peyman, C Gabriel, E H Grant, G Vermeeren and L Martens |
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Variation of the dielectric properties of tissues with age: the effect on the values of SAR in children when exposed to walkie–talkie devices |
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2009 |
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Phys Med Biol. |
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54 |
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227-241 |
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In vitro dielectric properties of ageing porcine tissues were measured in the frequency range of 50 MHz–20 GHz, and the total combined uncertainties of the measurements were assessed. The results show statistically significant reduction with age in both permittivity and conductivity of 10 out of 15 measured tissues. At microwave frequencies, the observed variations are mainly due to the reduction in the water content of tissues as an animal ages. The results obtained were then used to calculate the SAR values in children of age 3 and 7 years when they are exposed to RF induced by walkie–talkie devices. No significant differences between the SAR values for the children of either age or for adults were observed. |
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CNR-ISIB @ paolo.ravazzani @ |
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149 |
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Peyman A, Gabriel C. |
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Cole-Cole parameters for the dielectric properties of porcine tissues as a function of age at microwave frequencies. |
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2010 |
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Phys Med Biol. |
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55 |
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413-419 |
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We have applied the Cole–Cole expression to the dielectric properties of tissues in the frequency range 0.4–10 GHz. The data underpinning the model relate to pig tissue as a function of age. Altogether, we provide the Cole–Cole parameters for 14 tissue types at three developmental stages. |
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CNR-ISIB @ paolo.ravazzani @ |
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150 |
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Author |
Peyman A. |
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Dielectric properties of tissues; variation with age and their relevance in exposure of children to electromagnetic fields; state of knowledge. |
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2011 |
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Progress in Biophysics and Molecular Biology |
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107 |
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3 |
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434-438 |
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This paper reviews and summarises the state of knowledge on dielectric properties of tissues; in particular those obtained as a function of age. It also examines the impact of variation in dielectric data on the outcome of recent dosimetric studies assessing the exposure of children to electromagnetic fields. |
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CNR-ISIB @ paolo.ravazzani @ |
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151 |
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Bedja M., Magne I., Souques M., Lambrozo J., Le Brusquet L., Fleury G., Azoulay A., Carlsberg A. |
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Exposure of the French population to 50 Hz magnetic fields: EXPERS study |
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2010 |
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Third European IRPA Congress |
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To study the exposure of the French population to 50 Hz magnetic fields (MF), two samples (children and adults) representative of this population were created. Each person wore an EMDEX II measuring and recording the MF to which he/she was exposed during 24h, and has progressively filled in a timetable and a questionnaire with information about themselves and their homes. When returning the meter, the pollster recorded the GPS coordinates of their homes. In total, 978 series of MF were validated for children and 1054 for adults. The arithmetic and geometric means observed were respectively 0.09 and 0.02 µT for children and 0.14 and 0.03 µT for adults. |
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CNR-ISIB @ paolo.ravazzani @ |
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153 |
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