The backprojection (i.e. Step 2 in Algorithms 1-3) is the most time consuming part of the filtered backprojection algorithm. The filtering or convolution step (Step 1 in Algorithms 1-3) requires in ...

In this section we give a detailed description of the most important algorithm in 2D tomography. The discrete implementation depends on the scanning geometry, i.e. the way the data is sampled. This ...