25 October 1989 Optical Processing Of Images Obtained By Transillumination Of Heterogeneous Scattering And Absorbing Media
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Proceedings Volume 1134, Optical Pattern Recognition II; (1989) https://doi.org/10.1117/12.961628
Event: 1989 International Congress on Optical Science and Engineering, 1989, Paris, France
The multiwavelength laser transillumination is about to reveal itself as a very convenient mammography method to detect and localize suspicious areas in the breast. Primary experiments had clearly shown that the position of an heterogeneous zone relative to the detector greatly influences the response signal. To minimize its influence, we have combined a laser transillumination technique with an image reconstruction method. We did not scan point by point the studied medium, but directly transilluminated the medium along an axis. Then, the reconstruction is achieved from a set of projections, defined by 128 points, which also yields 128 x 128 pictures. Since photonic signals are used, it appears to be judicious to include an optical spatial filter in the Fourier plane. Because of the high scattering caracteristic of biological media, an incoherent to coherent convertion is necessary to obtain an optical Fourier transform of the projections. This is achieved by a liquid crystal light valve. The setup can be considered as an experimental approach of an 'optical scanner' when used in the field of biological imaging.
© (1989) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
J. P. Lefebvre, J. P. Lefebvre, G. Jarry, G. Jarry, C. Jorand, C. Jorand, } "Optical Processing Of Images Obtained By Transillumination Of Heterogeneous Scattering And Absorbing Media", Proc. SPIE 1134, Optical Pattern Recognition II, (25 October 1989); doi: 10.1117/12.961628; https://doi.org/10.1117/12.961628

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