19 February 2018 Photoacoustic scanning macroscopy with interferometric ultrasound detection based on a fiber optic ring array
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Abstract
We present a system for large depth-of-field photoacoustic scanning macroscopy (PASMac). Photoacoustic waves are detected optically with a fiber-optic annular detector array. Pressure changes, induced by the photoacoustic waves, modulate the refractive index in the fibers. The resulting variation of the optical path is measured by interferometric means. The ring-shape of the fibers results in a higher sensitivity to pressure waves stemming from the ring symmetry axis compared to off-axis signals. Hence, the fiber-optic ring-shaped detector array embodies a focused ultrasound transducer, however with a greatly extended depth-of-field. To reduce off-axis sensitivity, the signals from multiple rings with varying diameters are summed up using coherence weighting. By raster scanning of the sensor array, threedimensional or cross-sectional images are formed. We report on the design of an enhanced detector with 8 concentric rings for targeted imaging depths ranging from 5 mm to 50 mm.
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J. Bauer-Marschallinger, J. Bauer-Marschallinger, A. Höllinger, A. Höllinger, P. Torke, P. Torke, G. Paltauf, G. Paltauf, G. Haudum, G. Haudum, B. Jakoby, B. Jakoby, P. Burgholzer, P. Burgholzer, T. Berer, T. Berer, } "Photoacoustic scanning macroscopy with interferometric ultrasound detection based on a fiber optic ring array", Proc. SPIE 10494, Photons Plus Ultrasound: Imaging and Sensing 2018, 104945V (19 February 2018); doi: 10.1117/12.2289639; https://doi.org/10.1117/12.2289639
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