Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
24
pubmed:dateCreated
2008-12-3
pubmed:abstractText
We calculated the whole-body-averaged specific absorption rates (WBSARs) in a Japanese 9-month-old infant model and its corresponding homogeneous spheroidal and ellipsoidal models with 2/3 muscle tissue for 1-6 GHz far-field exposure. As a result, we found that in comparison with the WBSAR in the infant model, the ellipsoidal model with the same frontally projected area as that of the infant model provides an underestimate, whereas the ellipsoidal model with the same surface area yields an overestimate. In addition, the WBSARs in the homogenous infant models were found to be strongly affected by the electrical constant of tissue, and to be larger in the order of 2/3 muscle, skin and muscle tissues, regardless of the model shapes or polarization of incident waves. These findings suggest that the ellipsoidal model having the same surface area as that of the infant model and electrical constants of muscle tissue provides a conservative WBSAR over wide frequency bands. To confirm this idea, based on the Kaup index for Japanese 9-month-old infants, which is often used to represent the obesity of infants, we developed linearly reduced 9-month-old infant models and the corresponding muscle ellipsoidals and re-calculated their whole-body-averaged SARs with respect to body shapes. Our results reveal that the ellipsoidal model with the same surface area as that of a 9-month-old infant model gives a conservative WBSAR for different infant models, whose variability due to the model shape reaches 15%.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:status
MEDLINE
pubmed:month
Dec
pubmed:issn
0031-9155
pubmed:author
pubmed:issnType
Print
pubmed:day
21
pubmed:volume
53
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
7215-23
pubmed:meshHeading
pubmed:year
2008
pubmed:articleTitle
Conservative estimation of whole-body-averaged SARs in infants with a homogeneous and simple-shaped phantom in the GHz region.
pubmed:affiliation
Department of Computer Science and Engineering, Nagoya Institute of Technology, Japan. ahirata@nitech.ac.jp
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't