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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 25 — Dec. 6, 2010
  • pp: 26285–26292

Model-based correction of finite aperture effect in photoacoustic tomography

Meng-Lin Li, Yi-Chieh Tseng, and Chung-Chih Cheng  »View Author Affiliations

Optics Express, Vol. 18, Issue 25, pp. 26285-26292 (2010)

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In this study, we adopt a model-based correction method to reduce the finite aperture effect in photoacoustic tomography (PAT) – the tangential resolution deteriorates as the imaging point moves away from the circular scanning center. Such degradation in resolution originates from the spatial impulse responses (SIRs) of the used finite-sized unfocused transducer. Based on a linear, discrete PAT imaging model, the proposed method employs a spatiotemporal optimal filter designed in minimum mean square error sense to compensate the SIRs associated with an unfocused transducer at every imaging point; thus retrospective restoration of the tangential resolution can be achieved. Simulation and experimental results demonstrate that this method can substantially improve the degraded tangential resolution for PAT with finite-sized unfocused transducers while retaining the radial resolution.

© 2010 OSA

OCIS Codes
(170.3880) Medical optics and biotechnology : Medical and biological imaging
(170.5120) Medical optics and biotechnology : Photoacoustic imaging

ToC Category:
Medical Optics and Biotechnology

Original Manuscript: September 20, 2010
Revised Manuscript: November 3, 2010
Manuscript Accepted: November 15, 2010
Published: December 1, 2010

Meng-Lin Li, Yi-Chieh Tseng, and Chung-Chih Cheng, "Model-based correction of finite aperture effect in photoacoustic tomography," Opt. Express 18, 26285-26292 (2010)

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