Figure 4.
The illustration shows a two-dimensional object labelled f of x comma y centred at origin O on X and Y axes. A radial line from O forms an angle theta with the X axis and has length R to the object boundary. A straight projection line intersects the object at an angle theta and a distance t from the origin. The length of the intersection along the line is marked L. The projection profile is labelled g sub 0 of R. Two source detector positions are indicated along dashed lines outside the object.Parallel X-beam projection process based on Randon transform