
Figure 15
(a) With a parallel beam, the onedimensional Fourier transform of a onedimensional radiograph of a twodimensional object at angle is equal to the onedimensional slice at angle in the twodimensional Fourier domain of the twodimensional object. (b) Sampling in the Fourier domain; the blue and red lines shown on the figure are the angular and radial sampling steps. 