PhD Dissertation Defense-Rupak Bardhan Roy
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  • PhD Dissertation Defense-Rupak Bardhan Roy

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STUDY ON LOCALIZED THERMAL EXPANSION

GRADIENT FORMATION FOR ACOUSTIC WAVE

GENERATION IN A NOVEL THERMOACOUSTIC IMAGING MODALITY

Rupak Bardhan Roy

 PhD Dissertation, 2017

Thesis Jury

Assc. Prof. Dr Ayhan Bozkurt(Thesis Advisor), Prof. Serhat Yesilyurt

, Prof. Ibrahim Tekin, Assc. Prof. Arif Sanli Ergun, Assc. Prof. Goksenin Yaralioglu

Date & Time: 31st July, 2017 –  9 AM

Place: FENS G032

Keywords : Thermoacoustic imaging, HIFU, Ultrasound, Thermal Expansion,

Abstract

 

Thermoacoustics as the name suggests is the process of generation of sound by heat or vice versa. Volume generated thermoacoustic signals can be produced by thermal expansion induced volume contraction and rarefaction inside a target body. Thermoacoustic imaging uses this modality to obtain vivid insight into the internal structure of target body, both for Non Destructive Testing and Biomedical imaging. Any penetrating pulsed radiation can be used for such purpose, including microwave where the modality is called thermoacoustics in general or by incident light waves where the same is termed as photoacoustics. The current thesis introduces a novel thermoacoustic imaging modality where pulsed ultrasound is used as the incident penetraing source. A formal forward transient theoretical eqution set is derived based on established transient acoustic propagation models  and the problem is solved using a commercially available FEM software. The results are then compared with experimental results and considerable agreement has been observed.