Computer Vision, Automated Inspection, Radon Transform, Computed Tomography, Fourier Transform.
intensity I₀ can be written as: Equation (4) tells us that -ln(Id/I₀) is proportional to the sum (the integration in the limit case) of the local absorption coefficients αi encountered by the X-ray along its path across the material. That is why we can consider the X-ray projections as integrations