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(A) NEMA image-quality phantom shown with standard spheres and half-sized spheres. Body activity concentration is 2 kBq/mL, sphere contrast is 9.7:1, and scan duration is 7.5 min. (B) CRCs as per NEMA guidelines for both standard and half-sized spheres. (C) Background variability as per NEMA guidelines for half-sized spheres.
