Spatial Filtering of Optical Scattered Waves in Bio-Medical Media By Inhomogeneous Waveguide Grids For Optical CT

Medical image diagnosis and computer aided diagnosis are modern important medical techniques developed with computer technology. Particularly, medical image diagnosis using optical waves of lasers is very important technical tools for physiological examination of human body. Image responses of optical transmitted projection include optical scattering characteristics that disturb transmission properties through biological structures depending on optical absorption effects due to biological characteristics consisting of atomic and molecular structure. In this paper, technical methods of spatial filtering for optical scattering superposed on transmitted and attenuated waves are discussed to improve image diagnosis. Statistical theory of optical waves is described for optical propagation, attenuation and scattering in random inhomogeneous biological media. Spatial filtering characteristics of grid structure are shown for exact image optical projection excluding scattering effects through physiological media. Spatial filtering characteristics for off-axial scattering optical waves are discussed by mode propagation properties with large attenuation for higher order modes in inhomogeneous waveguide-type grids.