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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 42, Iss. 10 — Apr. 1, 2003
  • pp: 1899–1908

Two-dimensional photoacoustic imaging by use of Fourier-transform image reconstruction and a detector with an anisotropic response

Kornel P. Köstli and Paul C. Beard  »View Author Affiliations


Applied Optics, Vol. 42, Issue 10, pp. 1899-1908 (2003)
http://dx.doi.org/10.1364/AO.42.001899


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Abstract

Theoretical and experimental aspects of two-dimensional (2D) biomedical photoacoustic imaging have been investigated. A 2D Fourier-transform-based reconstruction algorithm that is significantly faster and produces fewer artifacts than simple radial backprojection methods is described. The image-reconstruction time for a 208 × 482 pixel image is ∼1 s. For the practical implementation of 2D photoacoustic imaging, a rectangular detector geometry was used to obtain an anisotropic detection sensitivity in order to reject out-of-plane signals, thereby permitting a tomographic image slice to be reconstructed. This approach was investigated by the numerical modeling of the broadband directional response of a rectangular detector and imaging of various spatially calibrated absorbing targets immersed in a turbid phantom. The experimental setup was based on a Q-switched Nd:YAG excitation laser source and a mechanically line-scanned Fabry-Perot polymer-film ultrasound sensor. For a 800 μm × 200 μm rectangular detector, the reconstructed image slice thickness was 0.8 mm up to a vertical distance of z = 3.5 mm from the detector, increasing thereafter to 2 mm at z = 10 mm. Horizontal and vertical spatial resolutions within the reconstructed slice were approximately 200 and 60 μm, respectively.

© 2003 Optical Society of America

OCIS Codes
(170.3010) Medical optics and biotechnology : Image reconstruction techniques
(170.5120) Medical optics and biotechnology : Photoacoustic imaging

History
Original Manuscript: September 20, 2002
Revised Manuscript: January 6, 2003
Published: April 1, 2003

Citation
Kornel P. Köstli and Paul C. Beard, "Two-dimensional photoacoustic imaging by use of Fourier-transform image reconstruction and a detector with an anisotropic response," Appl. Opt. 42, 1899-1908 (2003)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-42-10-1899

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