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dc.contributor.advisorTharp, Hal S.en_US
dc.contributor.authorFan, Xiaobing, 1960-
dc.creatorFan, Xiaobing, 1960-en_US
dc.date.accessioned2013-04-03T13:15:51Z
dc.date.available2013-04-03T13:15:51Z
dc.date.issued1992en_US
dc.identifier.urihttp://hdl.handle.net/10150/278188
dc.description.abstractAn improved numerical model for calculating the ultrasonic power deposition in layered medium was developed and experimentally verified. The new model takes into account the ultrasound wave reflection and refraction at irregular tissue interfaces thereby providing improved accuracy in ultrasound hyperthermia treatment planning. The model was compared with a simplified model to evaluate when the tissue interfaces could be ignored in the hyperthermia treatment planning and evaluation. The effects of variations in water and tissue temperatures, the fat layer thicknesses, the bone-tissue interface, and the beam entrance angles were also investigated to establish guidelines for treatment execution. It was found that in most cases the effects of the soft tissue interfaces can be ignored. However, in some instances the acoustic focus may be shifted several millimeters off axis in layered medium. This is important when sharply focused transducers are used for ultrasound surgery or under the condition of pulsed, high temperature hyperthermia treatments.
dc.language.isoen_USen_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.subjectPhysics, Radiation.en_US
dc.subjectBiophysics, General.en_US
dc.subjectPhysics, Acoustics.en_US
dc.titleNumerical model for calculating the ultrasonic power deposition in layered mediumen_US
dc.typetexten_US
dc.typeThesis-Reproduction (electronic)en_US
thesis.degree.grantorUniversity of Arizonaen_US
thesis.degree.levelmastersen_US
dc.identifier.proquest1349477en_US
thesis.degree.disciplineGraduate Collegeen_US
thesis.degree.nameM.S.en_US
dc.identifier.bibrecord.b27699614en_US
refterms.dateFOA2018-08-15T08:02:08Z
html.description.abstractAn improved numerical model for calculating the ultrasonic power deposition in layered medium was developed and experimentally verified. The new model takes into account the ultrasound wave reflection and refraction at irregular tissue interfaces thereby providing improved accuracy in ultrasound hyperthermia treatment planning. The model was compared with a simplified model to evaluate when the tissue interfaces could be ignored in the hyperthermia treatment planning and evaluation. The effects of variations in water and tissue temperatures, the fat layer thicknesses, the bone-tissue interface, and the beam entrance angles were also investigated to establish guidelines for treatment execution. It was found that in most cases the effects of the soft tissue interfaces can be ignored. However, in some instances the acoustic focus may be shifted several millimeters off axis in layered medium. This is important when sharply focused transducers are used for ultrasound surgery or under the condition of pulsed, high temperature hyperthermia treatments.


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