A novel all-optical forward-viewing photoacoustic probe using a flexible coherent fibre-optic bundle and a Fabry- Perot (FP) ultrasound sensor has been developed. The fibre bundle, along with the FP sensor at its distal end, synthesizes a high density 2D array of wideband ultrasound detectors. Photoacoustic waves arriving at the sensor are spatially mapped by optically scanning the proximal end face of the bundle in 2D with a CW wavelength-tunable interrogation laser. 3D images are formed from the detected signals using a time-reversal image reconstruction algorithm. The system has been characterized in terms of its PSF, noise-equivalent pressure and field of view. Finally, the high resolution 3D imaging capability has been demonstrated using arbitrary shaped phantoms and duck embryo.
R. Ansari, E. Zhang, A. E. Desjardins, and P. C. Beard, "All-optical endoscopic probe for high resolution 3D photoacoustic tomography," Proc. SPIE 10064, Photons Plus Ultrasound: Imaging and Sensing 2017, 100641W (Presented at SPIE BiOS: January 31, 2017; Published: 23 March 2017); https://doi.org/10.1117/12.2250617.
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