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Terahertz (THz) tomography is a rather novel technique for nondestructivetesting that is particularly suited for the testing of plastics and ceramics.Previous publications showed a large variety of conventional algorithms adaptedfrom computed tomography or ultrasound tomography which were directly appliedto THz tomography. Conventional algorithms neglect the specific nature of THzradiation, i.e. refraction at interfaces, reflection losses and the beamprofile (Gaussian beam), which results in poor reconstructions. The aim is theefficient reconstruction of the complex refractive index, since it indicatesinhomogeneities in the material. A hybrid algorithm has been developed based onthe algebraic reconstruction technique (ART). ART is adapted by includingrefraction (Snell's law) and reflection losses (Fresnel equations). Our methoduses a priori information about the interface and layer geometry of the sample.This results in the 'Modified ART for THz tomography', which reconstructssimultaneously the complex refractive index from transmission coefficient andtravel time measurements.

A modified algebraic reconstruction technique taking refraction into account with an application in terahertz tomography