Fast backprojectionThe 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 ...

Proposed is a theoretically exact formula for inversion of data obtained by a spiral computed tomography (CT) scan with a two-dimensional detector array. The detector array is supposed to be of ...