Journal
PHOTOACOUSTICS
Volume 8, Issue -, Pages 28-36Publisher
ELSEVIER GMBH
DOI: 10.1016/j.pacs.2017.09.002
Keywords
Optoacoustic; Thermoacoustic; Tomography; Piezoelectric polymer; Ultrasound array
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Funding
- Austrian Science Fund (FWF) [S10502]
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Photoacoustic tomography relies on a dense coverage of the surface surrounding the imaged object with ultrasound sensors in order to enable an accurate reconstruction. A curved arrangement of integrating line sensors is proposed that is able to acquire data for a linear projection image of the absorbed energy density distribution in the object. Upon rotation of the object relative to the array, three-dimensional (3D) images can be obtained. The proposed design is based on the cost-effective piezoelectric polymer film technology with 64 line shaped sensors arranged on a half-cylindrical surface. It is combined with an optical parametric oscillator for the near infrared as a source for laser pulses. Image reconstruction from recorded signals consists of two-dimensional (2D) back projection followed by an inverse Radon transform. The tomograph exhibits a spatial resolution on the order of 200 to 250 mu m. In a phantom experiment, the steps from acquisition of a single, 2D projection image to a full 3D image are demonstrated. Finally, in vivo projection images of a human finger are shown, revealing the near real-time imaging capability of the device in 2D. (C) 2017 The Authors. Published by Elsevier GmbH.
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