j EakfOld k projections for a certain number of iterations. It is evident that the computational effort of the ART algorithm is relatively low, but data matrices can be several hundred of Megabytes in size.

It has been shown that by careful adjustment of the relaxation parameters and the order in which the collected data are accessed during the reconstruction procedure, ART can produce high-quality reconstructions with excellent computational efficiency.4 In particular, the choice of the projection data access scheme proved to be crucial for improvement of low-contrast object detection.7 An important modification of ART consists of setting to zero those values in the array that are clearly zero because they correspond to a ray sum that was observed as zero. This is an important boundary condition for any of the iterative techniques.

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