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Axial images of the anthropomorphic head phantom, illustrating the visibility of low-contrast stimuli for various scan protocols and reconstruction filters. A relatively low-contrast stimulus (−80 HU) is marked by the arrow, with contrast-to-noise ratio noted in the lower-left of each panel. The results help to guide development of future protocols that may support soft-tissue visualization in head imaging — for example, Custom Head 2 with Smooth or Normal two-dimensional filters.
