Document Detail


RF dosimetry: a comparison between power absorption of female and male numerical models from 0.1 to 4 ghz.
MedLine Citation:
PMID:  15609567     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Realistic numerical models of human subjects and their surrounding environment represent the basic points of radiofrequency (RF) electromagnetic dosimetry. This also involves differentiating the human models in men and women, possibly with different body shapes and postures. In this context, the aims of this paper are, firstly, to propose a female dielectric anatomical model (fDAM) and, secondly, to compare the power absorption distributions of a male and a female model from 0.1 to 4 GHz. For realizing the fDAM, a magnetic resonance imaging tomographer to acquire images and a recent technique which avoids the discrete segmentation of body tissues into different types have been used. Simulations have been performed with the FDTD method by using a novel filtering-based subgridding algorithm. The latter is applied here for the first time to dosimetry, allowing an abrupt mesh refinement by a factor of up to 7. The results show that the whole-body-averaged specific absorption rate (WBA-SAR) of the female model is higher than that of the male counterpart, mainly because of a thicker subcutaneous fat layer. In contrast, the maximum averaged SAR over 1 g (1gA-SAR) and 10 g (10gA-SAR) does not depend on gender, because it occurs in regions where no subcutaneous fat layer is present.
Authors:
L Sandrini; A Vaccari; C Malacarne; L Cristoforetti; R Pontalti
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Physics in medicine and biology     Volume:  49     ISSN:  0031-9155     ISO Abbreviation:  Phys Med Biol     Publication Date:  2004 Nov 
Date Detail:
Created Date:  2004-12-21     Completed Date:  2005-05-05     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0401220     Medline TA:  Phys Med Biol     Country:  England    
Other Details:
Languages:  eng     Pagination:  5185-201     Citation Subset:  IM    
Affiliation:
ITC-irst--Bioelectromagnetism Lab, FCS Department, 38050 Povo (Trento), Italy.
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MeSH Terms
Descriptor/Qualifier:
Absorption
Adipose Tissue / pathology
Adult
Algorithms
Body Weight
Female
Head
Humans
Magnetic Resonance Imaging
Male
Models, Anatomic
Models, Theoretical
Phantoms, Imaging
Posture
Radiation Dosage
Radio Waves*
Radiometry / methods*
Sex Factors

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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