Abstract
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.
Highlights
Photoacoustic (PA) systems have recently been developed to obtain anatomical and structural information [1]
This paper presents a novel fisheye-lens-based PA system capable of achieving a wide field of view with low abbreviations was presented
This system can be possibly employed to reduce the effects of the mechanical motors that are used in conventional PA systems
Summary
Photoacoustic (PA) systems have recently been developed to obtain anatomical and structural information [1]. In a PA system, discrete or continuous light pulses are used to obtain the target information [2], the energy absorbed from the light generated by the target produces a transient thermal expansion, and the increased thermal emission energy is detected by an ultrasound transducer to determine the target’s biological information [3]. Compared to conventional optical systems, PA systems yield much weaker ultrasonic signals from biological targets because of the scattering of the reflected ultrasound waves [3,5,6]. Photoacoustic tomography techniques are more traditional and are used to diffuse pulsed light to enable it to penetrate deeply and to be scattered throughout large areas [4]. The light is detected by mechanical scanning transducers, and receiver electronics and reconstruction algorithms are employed to map the target information [3]
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