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Author:Laakso, Ilkka
Title:Computational uncertainty of finite-difference time-domain method in electromagnetic dosimetry
Aika-alueen differenssimenetelmän laskennallinen epävarmuus sähkömagneettisten kenttien dosimetriassa
Publication type:Licentiate thesis
Publication year:2009
Pages:[32] + 38      Language:   eng
Department/School:Elektroniikan, tietoliikenteen ja automaation tiedekunta
Main subject:Sähkömagnetiikka   (S-96)
Supervisor:Nikoskinen, Keijo
Instructor:Nikoskinen, Keijo
OEVS:
Electronic archive copy is available via Aalto Thesis Database.
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Location:P1 Ark S80     | Archive
Keywords:computational dosimetry
finite-difference methods
specific absorption rate
laskennallinen dosimetria
differenssimenetelmät
ominaisabsorptionopeus
Abstract (eng): Electromagnetic dosimetry studies the absorption of electromagnetic fields inside the human body.
For radio-frequency fields, the dose metric is specific absorption rate (SAR) which is linked to possible adverse thermal effects of electromagnetic power absorption.
As the geometry of the human body is complex and heterogeneous, accurate analysis of SAR values needs to be done by numerical methods.

In the recent years, finite-difference time-domain (FDTD) method has become the method of choice for computational dosimetry.
The emphasis of this thesis is to study how reliably the SAR values are assessed by FDTD method, and which factors affect the accuracy and uncertainty of the results.
In addition to SAR values, also the temperature rise due to electromagnetic power absorption and its modelling by the bioheat equation is studied.
Abstract (fin): Sähkömagneettisten kenttien dosimetria tutkii sähkömagneettisten kenttien absorptiota ihmiskehon sisällä.
Radiotaajuisille kentille säteilyannoksen (engl. dose) mittana on ominaisabsorptionopeus (SAR), joka liittyy mahdollisiin sähkömagneettisen tehoabsorption haitallisiin lämpövaikutuksiin.
Koska ihmiskehon geometria on monimutkainen ja heterogeeninen, SAR-arvojen tarkka analyysi täytyy tehdä numeerisin menetelmin.

Viime vuosina aika-alueen differenssimenetelmästä (FDTD) on tullut suosituin menetelmä laskennallisessa dosimetriassa.
Tämän työn tavoitteena on tutkia kuinka luotettavasti SAR-arvoja saadaan arvioitua FDTD-menetelmällä, ja mitkä tekijät vaikuttavat tulosten tarkkuuteen ja epävarmuuteen.
SAR-arvojen lisäksi tutkitaan myös sähkömagneettisen tehoabsorption aiheuttamaa lämpötilan nousua, ja sen mallintamista biolämpöyhtälön avulla.
ED:2010-08-09
INSSI record number: 40056
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