Date of Award

Summer 2017

Document Type

Dissertation

Degree Name

Doctor of Philosophy in Mechanical Engineering - (Ph.D.)

Department

Mechanical and Industrial Engineering

First Advisor

Zhiming Ji

Second Advisor

I. Joga Rao

Third Advisor

Pushpendra Singh

Fourth Advisor

Bernard Koplik

Fifth Advisor

Cong Wang

Abstract

High Intensity Focused Ultrasound (HIFU) is becoming a widely accepted modality for extracorporeal non-invasive hyperthermia and surgical procedures. Since ultrasonic transducers need to operate in various challenging body locations, the arrangement of their array elements can be optimized to improve the capability of controlling focus intensity. In the first part of this dissertation, patterns of pressure field variations with several selected design variables (kerf, transducer element’s number and element’s width-height) are studied. These patterns indicate that there is a more suitable shape and arrangement of transducer elements in a specified area to achieve highest possible pressure. In order to obtain this arrangement, a Genetic Algorithm (GA) based evolutionary global search method is used to optimize the design shape and the distribution of ultrasonic transducer elements that can deliver maximum pressure at the focus zone.

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