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In very turbid media (see Optical imaging in turbid media: Introduction) virtually all photons are scattered many times and at large scattering angles and there may simply be no "straight-line" photons to detect. Hence, imaging methods applicable to very turbid media utilize the fact that even when "all" photons are multiply scattered by the medium, the travel time of such photons from the light source to the detector nevertheless depends on locations, forms, and properties of objects immersed in the medium. Small differences in the travel time can be detected by using a time-modulated light source, which launches "photon waves" into the medium and by comparing the reference modulation waveform with that detected by a detector viewing the medium.
An example of very turbid medium is mammalian tissue. Imaging in such tissue, especially human tissue, is of significant interest for medical diagnostics. Research in imaging methods is being actively pursued in this area (for example, Gibson et al 2005).
| CITATION: Jonasz M. 2006. Optical imaging methods for very turbid media (www.tpdsci.com/Tpc/ImgTMMetV.php). In: Top. Part. Disp. Sci. (www.tpdsci.com). |
HISTORY: Published: 18-Jan-2006 Modified: 27-Jan-2007 Peer-reviewed: PENDING |
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