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FIGURE 3. (Left) Principle of projection for one 3 x 3 slice at angle {theta} = 0 and {theta} = 90°. Value in each bin is sum of values of pixels that project onto that bin. (Right) Example: g1 = f3 + f6 + f9 = 2 + 2 + 3 = 7. Result of projection is sinogram with 2 rows, whose values are (7, 9, 7) and (6, 9, 8).





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