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Reconstructed images of the contrast phantom embedded with three tissue-equivalent objects (a) before and (b) after the application of a cupping artifact correction. The images were obtained with BGO-1 at a scan dose of 16 cGy. Note the presence of a ring-like artifact close to the center of the phantom that was not removed by the correction. This artifact is likely due to the presence of unintended air gaps between the phantom and the solid water rod that supports it.
