Efficient computation of projections in iterative SPECT reconstruction
- 1 January 1995
- proceedings article
- Published by SPIE-Intl Soc Optical Eng in Proceedings of SPIE
- Vol. 2622, 792-795
- https://doi.org/10.1117/12.216879
Abstract
In calculating projections for iterative SPECT, a particularly time consuming part of the calculation is convolution of the activity at each depth by the point-spread function, using FFTs. We find that space-based convolutions with a short-range kernel are equivalent and faster, if one uses the central limit theorem to generate a gaussian, depth-dependent point- spread function. This technique is applied to forward and backward projections.Keywords
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