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Sensors 2016, 16(12), 2185;

A Novel Fisheye-Lens-Based Photoacoustic System

Department of Medical IT Convergence Engineering, Kumoh National Institute of Technology, Gumi 39253, Korea
Department of Optical System Engineering, Kumoh National Institute of Technology, Gumi 39253, Korea
Department of Biomedical Engineering, Gachon University, In-cheon 21936, Korea
Author to whom correspondence should be addressed.
Academic Editors: Dipen N. Sinha and Cristian Pantea
Received: 28 October 2016 / Revised: 8 December 2016 / Accepted: 14 December 2016 / Published: 19 December 2016
(This article belongs to the Special Issue Ultrasonic Sensors)
Full-Text   |   PDF [4380 KB, uploaded 19 December 2016]   |  


This paper presents a novel fisheye-lens-based photoacoustic (PA) system. In conventional PA systems, mechanical motors are utilized to obtain the target information due to the small fields of view of such systems. The use of such motors introduces mechanical noise, which is difficult to remove when processing the echo signals. A fisheye lens system offering a wide field of view would effectively reduce the motor effects (i.e., the noise) and enable the system to have a wide field of view. Therefore, in this work, we propose a novel fisheye lens scheme and describe a PA system based on the developed lens scheme. In addition, to confirm the feasibility of the fisheye-lens-based PA system, we present the typical pulse-echo responses obtained using a 20 MHz single element immersion transducer and the echo signals measured from bull’s eye tissue samples separated by approximately 4, 6, 8, and 10 cm diagonally and 2 cm vertically from the fisheye lens. The experimental results demonstrate that the echo signal amplitudes, their center frequencies, and the −6 dB bandwidths obtained using red, green, and blue lights and a fisheye lens are acceptable when the fisheye lens is separated from a sample both diagonally and vertically. Therefore, fisheye-lens-based PA systems could be a potential method of achieving wide fields of view while reducing the mechanical motor effects. View Full-Text
Keywords: fisheye lens; photoacoustic; ultrasound; transducers fisheye lens; photoacoustic; ultrasound; transducers

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Choi, H.; Ryu, J.; Kim, J. A Novel Fisheye-Lens-Based Photoacoustic System. Sensors 2016, 16, 2185.

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