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Proceedings Paper

Optical generation of narrowband high frequency ultrasound
Author(s): Shi-Yao Hung; Bao-Yu Hsieh; Pai-Chi Li
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Paper Abstract

We propose a multilayer film structure to generate high frequency and narrowband ultrasound. It consists of three light-absorbing layers and two light-transmittance layers. The amplitude is tunable by adjusting the optical absorption coefficient of light-absorbing layers. The delay can be adjusted by changing thicknesses of light-transmittance layers. In one example, the generated high frequency narrowband ultrasound signal has a center frequency of 18.4MHz and 32.6% fractional bandwidth using the proposed multilayer structure. Compared with this result, the single layer structure produces a center frequency of 20.2MHz and 125.7% fractional bandwidth. In addition, a single laser pulse was employed to generate US on the multilayer film as an US source and PA signals of the high optical absorption region of the phantom at the same time. Because the spectral characteristics of the ultrasound signals generated by the multi-layer film are tunable, it can be designed such that the US echo and PA echo are spectrally separable, thus enabling simultaneous US/PA imaging using only a single laser pulse. Feasibility of this proposed method was demonstrated by imaging of a cyst-like phantom.

Paper Details

Date Published: 3 March 2014
PDF: 10 pages
Proc. SPIE 8943, Photons Plus Ultrasound: Imaging and Sensing 2014, 89432Z (3 March 2014); doi: 10.1117/12.2039290
Show Author Affiliations
Shi-Yao Hung, National Taiwan Univ. (Taiwan)
Bao-Yu Hsieh, National Taiwan Univ. (Taiwan)
Pai-Chi Li, National Taiwan Univ. (Taiwan)

Published in SPIE Proceedings Vol. 8943:
Photons Plus Ultrasound: Imaging and Sensing 2014
Alexander A. Oraevsky; Lihong V. Wang, Editor(s)

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