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  • Laser scanning systems that use coherent light and interferometer techniques (i.e., optical coherence tomography [OCT]) to obtain cross-sectional images. These systems typically consist of a computerized unit including a light source, a photodetector, and a display. The light beam (usually in the infrared range) is divided into two beams, one directed towards the sample and the other towards a mirror; tomographic images are obtained by detecting the interference between the light reflected by both beams. The images obtained can show tissue about two or three mm (0.08 to 0.12 inch) in depth which provides axial and lateral resolution in the order of micrometers. Clinical use of OCT laser scanning systems is intended mainly to obtain detailed tomographic images of tissues, especially ophthalmology and intravascular images.
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