In Fig. 31 we have superimposed a square grid on the image f(x, y\ and
we assume that in each cell
/(x,
y) can be considered to be constant. Let f
m
denote this constant value in the mth cell, and let JV be the total number of
Fig. 31 In algebraic reconstruction methods, a square grid is superimposed over the
unknown image. Image values are assumed to be constant within each cell of the grid.
416
8 Reconstruction
cells.
For the algebrai ...
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