Abstract
The optical CT unit which was assembled with the laser diode working at the wavelength of 1.3 μm, and a glass optical fiber and a pin-hole with a diameter of the 100 μm yields the collimated near-infrared light through a scattering medium. Because the spatial collimator system needs no fast response time, a high sensitive Ge-PIN photodetector was employed the CT system. The optical CT image is allowed by use of near-infrared absorption characteristic. When the image construction of a grape was performed using projection data, so the comparatively good experimental results was obtained. The places of a grape seed was found without cutting. By means of the difference in characteristics of near-infrared absorption, the image of a cylindrical oil phantom in gelatin was reproduced.
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