FIGURE 6. Illustration of star (or streak) artifact. (A) Slice used to create projections. (B–G) 1, 3, 4, 16, 32, and 64 projections equally distributed over 360° are used to reconstruct slice using backprojection algorithm. Activity in reconstructed image is not located exclusively in original source location, but part of it is also present along each line of backprojection. As number of projections increases, star artifact decreases.

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