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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: James C. Wyant
  • Vol. 45, Iss. 24 — Aug. 20, 2006
  • pp: 6270–6282

Time-resolved optical tomography using short-pulse laser for tumor detection

Gopalendu Pal, Soumyadipta Basu, Kunal Mitra, and Tuan Vo-Dinh  »View Author Affiliations


Applied Optics, Vol. 45, Issue 24, pp. 6270-6282 (2006)
http://dx.doi.org/10.1364/AO.45.006270


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Abstract

Our objective is to perform a comprehensive experimental and numerical analysis of the short-pulse laser interaction with a tissue medium with the goal of tumor–cancer diagnostics. For a short-pulse laser source, the shape of the output signal is a function of the optical properties of the medium, and hence the scattered temporal optical signal helps in understanding the medium characteristics. Initially experiments are performed on tissue phantoms embedded with inhomogeneities to optimize the time-resolved optical detection scheme. Both the temporal and the spatial profiles of the scattered reflected and transmitted optical signals are compared with the numerical modeling results obtained by solving the transient radiative transport equation using the discrete ordinates technique. Next experiments are performed on in vitro rat tissue samples to characterize the interaction of light with skin layers and to validate the time-varying optical signatures with the numerical model. The numerical modeling results and the experimental measurements are in excellent agreement for the different parameters studied. The final step is to perform in vivo imaging of anesthetized rats with tumor-promoting agents injected inside skin tissues and of an anesthetized mouse with mammary tumors to demonstrate the feasibility of the technique for detecting tumors in an animal model.

© 2006 Optical Society of America

OCIS Codes
(140.0140) Lasers and laser optics : Lasers and laser optics
(170.0170) Medical optics and biotechnology : Medical optics and biotechnology
(170.3660) Medical optics and biotechnology : Light propagation in tissues
(170.6920) Medical optics and biotechnology : Time-resolved imaging

History
Original Manuscript: November 4, 2005
Revised Manuscript: February 8, 2006
Manuscript Accepted: March 7, 2006

Virtual Issues
Vol. 1, Iss. 9 Virtual Journal for Biomedical Optics

Citation
Gopalendu Pal, Soumyadipta Basu, Kunal Mitra, and Tuan Vo-Dinh, "Time-resolved optical tomography using short-pulse laser for tumor detection," Appl. Opt. 45, 6270-6282 (2006)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-45-24-6270

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