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Biomedical Optics Express

Biomedical Optics Express

  • Editor: Joseph A. Izatt
  • Vol. 3, Iss. 3 — Mar. 1, 2012
  • pp: 418–434

Determining the optical properties of a gelatin‑TiO2 phantom at 780 nm

H. Günhan Akarçay, Stefan Preisser, Martin Frenz, and Jaro Rička  »View Author Affiliations

Biomedical Optics Express, Vol. 3, Issue 3, pp. 418-434 (2012)

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Tissue phantoms play a central role in validating biomedical imaging techniques. Here we employ a series of methods that aim to fully determine the optical properties, i.e., the refractive index n, absorption coefficient μa, transport mean free path * , and scattering coefficient μs of a TiO2 in gelatin phantom intended for use in optoacoustic imaging. For the determination of the key parameters μa and * , we employ a variant of time of flight measurements, where fiber optodes are immersed into the phantom to minimize the influence of boundaries. The robustness of the method was verified with Monte Carlo simulations, where the experimentally obtained values served as input parameters for the simulations. The excellent agreement between simulations and experiments confirmed the reliability of the results. The parameters determined at 780 nm are n=1.359(±0.002) , μ s =1/ * =0.22(±0.02) mm -1 , μ a = 0.0053(+0.0006-0.0003)  mm -1 , and μ s =2.86(±0.04)  mm -1 The asymmetry parameter g obtained from the parameters * and μ s is 0.93, which indicates that the scattering entities are not bare TiO2 particles but large sparse clusters. The interaction between the scattering particles and the gelatin matrix should be taken into account when developing such phantoms.

© 2012 OSA

OCIS Codes
(170.3660) Medical optics and biotechnology : Light propagation in tissues
(290.1990) Scattering : Diffusion
(290.4210) Scattering : Multiple scattering
(170.6935) Medical optics and biotechnology : Tissue characterization

ToC Category:
Calibration, Validation and Phantom Studies

Original Manuscript: November 28, 2011
Revised Manuscript: January 17, 2012
Manuscript Accepted: January 18, 2012
Published: February 7, 2012

H. Günhan Akarçay, Stefan Preisser, Martin Frenz, and Jaro Rička, "Determining the optical properties of a gelatin‑TiO2 phantom at 780 nm," Biomed. Opt. Express 3, 418-434 (2012)

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