Image reconstruction theory of electromagnetic wave CT based on spatial beam sampling characteristics

In this paper, basic theory of spatial sampling theorem for CT technology using beam wave eigen function systems, is discussed. For the spatial sampling theorem of CT method, asymptotic Hermite Gaussian functions expressed in rectangular coordinates are discussed for local beam eigen functions in virtual waveguide array with unit element spatial distances. For inhomogeneous target media, scattering fields disturb CT information depending on attenuation characteristics. Fundamental theory of electromagnetic waves for CT imaging is shown, considering interaction fields of scattering and attenuation. Statistical theory of electromagnetic wave is described for electromagnetic wave propagation, attenuation and scattering in random inhomogeneous media. Precise image reconstruction theory of electromagnetic CT method is discussed, based on scatterings and mode couplings in inhomogeneous guided modes in virtual waveguide array consisting of random media.