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Part of the detector plane to illustrate of the excluded pixels for eliminating penumbra. The blocker has a strip width of 1.6 mm and an interspace of 3.2 mm, corresponding to a 10‐pixel‐wide blocked region and a 20‐pixel‐wide unblocked region at detector plane. The blocker moving speed is 15 pixels per projection (13.2 mm s−1), 6‐ pixel‐wide region around the strip edge were excluded.
