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A simple method of rejecting nearly all scattered light, that blurs the image of an object in turbid medium, is based on accepting, by means of a collimator, only photons propagating within a narrow solid angle about the direction of the incident light. These photons are likely to participate in no or very few small-angle scattering events, which - respectively - allows the photons to keep their original propagation direction or change it only slightly. These photons, frequently referred to as ballistic and snake photons respectively, contribute to the development of a faithful image of an object withing turbid medium. The collimation method, also referred to as angular domain imaging, applies to a see-through configuration where the incident collimated light beam can be aligned with the collimator.
Chapman et al (2003) developed a simple, high angular resolution tubular collimator (200:1 aspect ratio) micromachined in a silicon wafer. Small size of the collimator requires mechanical scanning to examine samples larger than the collimator footprint.
| CITATION: Jonasz M. 2006. Collimation imaging in turbid media (www.tpdsci.com/Tpc/ImgTMClm.php). In: Top. Part. Disp. Sci. (www.tpdsci.com). |
HISTORY: Published: 18-Jan-2006 Modified: 03-Jul-2006 Peer-reviewed: PENDING |
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