19 February 2018 Photoacoustic projection imaging using an all-optical detector array
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We present a prototype for all-optical photoacoustic projection imaging. By generating projection images, photoacoustic information of large volumes can be retrieved with less effort compared to common photoacoustic computed tomography where many detectors and/or multiple measurements are required. In our approach, an array of 60 integrating line detectors is used to acquire photoacoustic waves. The line detector array consists of fiber-optic MachZehnder interferometers, distributed on a cylindrical surface. From the measured variation of the optical path lengths of the interferometers, induced by photoacoustic waves, a photoacoustic projection image can be reconstructed. The resulting images represent the projection of the three-dimensional spatial light absorbance within the imaged object onto a two-dimensional plane, perpendicular to the line detector array. The fiber-optic detectors achieve a noise-equivalent pressure of 24 Pascal at a 10 MHz bandwidth. We present the operational principle, the structure of the array, and resulting images. The system can acquire high-resolution projection images of large volumes within a short period of time. Imaging large volumes at high frame rates facilitates monitoring of dynamic processes.
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J. Bauer-Marschallinger, J. Bauer-Marschallinger, K. Felbermayer, K. Felbermayer, T. Berer, T. Berer, } "Photoacoustic projection imaging using an all-optical detector array", Proc. SPIE 10494, Photons Plus Ultrasound: Imaging and Sensing 2018, 104944C (19 February 2018); doi: 10.1117/12.2289810; https://doi.org/10.1117/12.2289810

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