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Reconstructions of the FORBILD head phantom (with right ear only). Upper row: DBP–HT reconstructions from data simulated without (left) and with (right) angular FFS. Bottom row: ground truth (left) and difference image between the two reconstructions in the top row. The grayscale window for the ground truth and the reconstructions is [0, 100] HU. The window for the difference image is [−50, 50] HU.
