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Permanent link (DOI): https://doi.org/10.7939/R3BH38

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Design, Fabrication, and Testing of High-Frequency High-Numerical-Aperture Annular Array Transducer for Improved Depth-of-Field Photoacoustic Microscopy Open Access

Descriptions

Other title
Subject/Keyword
high-frequency
annular-array
ultrasound-transducer
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Lu,huihong
Supervisor and department
Dr. Roger Zemp (Bio-electrical and Computer Engineering)
Examining committee member and department
Dr. Walied Moussa (Mechanical Engineering)
Dr. Chen Jie (Bio-electrical and Computer Engineering)
Department
Department of Electrical and Computer Engineering
Specialization
Biomedical Engineering
Date accepted
2012-03-13T15:45:25Z
Graduation date
2012-06
Degree
Master of Science
Degree level
Master's
Abstract
Researchers have been using single-element transducers for photoacoustic microscopy (PAM), but such systems have limited depth-of-field due to single focus. This project was to develop a high-frequency annular array transducer for improved depth-of-field PAM. We have designed a concave 40 MHz ultrasound transducer which has 8 annular array elements with equal area. The outer ring is 12 mm in diameter, the geometric focus is 12 mm, and the space between each annulus is 100 µm. The array was fabricated by lithographically patterning metalized polyimide film to define back electrodes. 9-micron-PVDF film was press-fit into the array pattern with epoxy as a backing material and a single drop of epoxy as a bonding layer. The array exhibits high sensitivity to high-frequency photoacoustic signals. Dynamic focusing of amplified and digitized signals permit extended depth-of-field imaging compared to the single-element transducer case. Dark-field light-delivery and 3-axis motorized scanning permit 3-D photoacoustic microscopy.
Language
English
DOI
doi:10.7939/R3BH38
Rights
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
Citation for previous publication
Huihong Lu, Peng Shao, Janaka Ranasinghesagara, Tim DeWolf, Tyler Harrison, William Gibson, and Roger J. Zemp, “Improved depth-of-field photoacoustic microscopy with a custom high-frequency annular array transducer”, Proc. of SPIE, Vol. 7899, 78993R-1, 2011.

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