23 February 2010 Polymer fiber detectors for photoacoustic imaging
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Abstract
Photoacoustic imaging is a novel imaging method for medical and biological applications, combining the advantages of Diffuse Optical Imaging (high contrast) and Ultrasonic Imaging (high spatial resolution). A short laser pulse hits the sample. The absorbed energy causes a thermoelastic expansion and thereby launches a broadband ultrasonic wave (photoacoustic signal). The distribution of absorbed energy density is reconstructed from measurements of the photoacoustic signals around the sample. For collecting photoacoustic signals either point like or extended, integrating detectors can be used. The latter integrate the pressure at least in one dimension, e.g. along a line. Thereby, the three dimensional imaging problem is reduced to a two dimensional problem. For a tomography device consisting of a scanning line detector and a rotating sample, fiber-based detectors made of polymer have been recently introduced. Fiber-based detectors are easy to use and possess a constant, high spatial resolution over their entire active length. Polymer fibers provide a better impedance matching and a better handling compared with glass fibers which were our first approach. First measurement results using polymer fiber detectors and some approaches for improving the performance are presented.
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Hubert Grün, Hubert Grün, Thomas Berer, Thomas Berer, Karoline Pühringer, Karoline Pühringer, Robert Nuster, Robert Nuster, Günther Paltauf, Günther Paltauf, Peter Burgholzer, Peter Burgholzer, } "Polymer fiber detectors for photoacoustic imaging", Proc. SPIE 7564, Photons Plus Ultrasound: Imaging and Sensing 2010, 75640M (23 February 2010); doi: 10.1117/12.840627; https://doi.org/10.1117/12.840627
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