Abstract
We present a single-ended technique for three-dimensional imaging of objects embedded in a turbid medium by the use of time-resolved fluorescence emission or Raman scattering. The technique uses the earliest arriving photons, which we show are not sensitive to the relatively long fluorescence lifetime, and thus can be used to extract the desired spatial information accurately, even at a distance equivalent to 100 mean free paths. The results also demonstrate the feasibility and the potential of one's combining time-resolved optical tomography with fluorescence or Raman spectroscopy to localize and identify the embedded objects. This technique may be valuable for the diagnosis of disease in highly scattering human tissue because it can provide spatial and biochemical information about the composition of embedded lesions.
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