Computed X-ray tomography (CT) is now a well established method used to reconstruct the inner structures of components. It has the advantage over conventional X-ray radiographs of easier interpretation of images, since the component under inspection can be “sliced” and observed to any depth. With simple X-ray images, all the inner structure information is compressed. In CT imagery a set of X ray radiographs is recorded along different projections around the component and a special algorithm is then used to reconstruct the unique distribution of attenuation coefficients inside the component (Kassab and Hsieh 1987; Jacoby and Lingenfelter 1989; Garvie and Sorell 1990). This map of attenuation coefficients corresponds to the inner structure of the part expressed as the ability of the matter to attenuate the rays.
KeywordsDefect Detection Thermal Tomography Infrared Image Depth Resolution Thermal Contrast
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