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Extraction of NECR data: (A) Extract in ROOT the sinogram data for each slice, (B) Set all pixels located more than 12 cm from the center of the FOV to 0, (C) Align the projection bins of each projection angle according to the maximum values, (D) Sum all projection angles of the sinogram, (E) Select a 40 mm wide strip to estimate random and scattered events, (F) Compute the scatter fraction and different count rate curves as well as the NECR.
