Estimating three-dimensional temperature fields during hyperthermia: Studies of the optimal regularization parameter and time sampling

Persistent Link:
http://hdl.handle.net/10150/276907
Title:
Estimating three-dimensional temperature fields during hyperthermia: Studies of the optimal regularization parameter and time sampling
Author:
Liauh, Chihng-Tsung, 1960-
Issue Date:
1988
Publisher:
The University of Arizona.
Rights:
Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
Abstract:
During hyperthermia therapy it is desirable to know the entire temperature field in the treatment region. Tikhonov regularization of order zero has been implemented. The accuracy of the estimates depends upon the value of regularization parameter, which has an optimal value that is dependent on the perfusion pattern and magnitude. The transient power-off time sampling length (i.e. the amount of transient data used) influences the accuracy of the estimates, and an optimal sampling length exists. The effects of additive noise are investigated, as are the effects of the initial guess of the perfusion values, and the effect of both symmetric and asymmetric blood perfusion patterns. The asymmetric patterns with noisy data are the most difficult cases to evaluate. The cases studied are not a comprehensive set, but a representative set whose results continue to show the feasibility of using state and parameter estimation methods to reconstruct the entire temperature field. (Abstract shortened with permission of author.)
Type:
text; Thesis-Reproduction (electronic)
Keywords:
Cancer -- Thermotherapy.; Temperature measurements -- Mathematical models.
Degree Name:
M.S.
Degree Level:
masters
Degree Program:
Graduate College; Aerospace and Mechanical Engineering
Degree Grantor:
University of Arizona
Advisor:
Roemer, Robert B.

Full metadata record

DC FieldValue Language
dc.language.isoen_USen_US
dc.titleEstimating three-dimensional temperature fields during hyperthermia: Studies of the optimal regularization parameter and time samplingen_US
dc.creatorLiauh, Chihng-Tsung, 1960-en_US
dc.contributor.authorLiauh, Chihng-Tsung, 1960-en_US
dc.date.issued1988en_US
dc.publisherThe University of Arizona.en_US
dc.rightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.en_US
dc.description.abstractDuring hyperthermia therapy it is desirable to know the entire temperature field in the treatment region. Tikhonov regularization of order zero has been implemented. The accuracy of the estimates depends upon the value of regularization parameter, which has an optimal value that is dependent on the perfusion pattern and magnitude. The transient power-off time sampling length (i.e. the amount of transient data used) influences the accuracy of the estimates, and an optimal sampling length exists. The effects of additive noise are investigated, as are the effects of the initial guess of the perfusion values, and the effect of both symmetric and asymmetric blood perfusion patterns. The asymmetric patterns with noisy data are the most difficult cases to evaluate. The cases studied are not a comprehensive set, but a representative set whose results continue to show the feasibility of using state and parameter estimation methods to reconstruct the entire temperature field. (Abstract shortened with permission of author.)en_US
dc.typetexten_US
dc.typeThesis-Reproduction (electronic)en_US
dc.subjectCancer -- Thermotherapy.en_US
dc.subjectTemperature measurements -- Mathematical models.en_US
thesis.degree.nameM.S.en_US
thesis.degree.levelmastersen_US
thesis.degree.disciplineGraduate Collegeen_US
thesis.degree.disciplineAerospace and Mechanical Engineeringen_US
thesis.degree.grantorUniversity of Arizonaen_US
dc.contributor.advisorRoemer, Robert B.en_US
dc.identifier.proquest1335829en_US
dc.identifier.oclc22191599en_US
dc.identifier.bibrecord.b17373748en_US
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