19 February 2018 Ring detector arrays for large depth of field scanning photoacoustic macroscopy
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Abstract
Several annular detector arrays are compared for scanning photoacoustic imaging. Compared to single, spherically focused detectors, the arrays offer similar sensitivity, but have an extended depth of field due to their dynamic focusing capability. The investigated arrays consist either of piezoelectric polymer film (PVDF) with a large sensing area for optimized sensitivity or of fiber optic rings, where the small width of elements gives rise to high bandwidth and resolution. Simulations demonstrate the superior resolution of the fiber-optic rings over a flat piezo array. However, with inclined sensing elements also the piezo-detector reaches a similar resolution as the optical array. In phantom experiments with the PVDF array the extended depth of field and the capability of imaging complex objects are demonstrated.
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Guenther Paltauf, Paul Torke, Robert Nuster, Johannes Bauer-Marschallinger, Thomas Berer, Gerhard Haudum, Peter Burgholzer, "Ring detector arrays for large depth of field scanning photoacoustic macroscopy", Proc. SPIE 10494, Photons Plus Ultrasound: Imaging and Sensing 2018, 104943Q (19 February 2018); doi: 10.1117/12.2292051; https://doi.org/10.1117/12.2292051
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