Fig. 5

Result of the visual detection of the spheres for NEMA-IQ (a) and b-NEMA-IQ (b) phantoms for different TBR, AC and ESD and sphere ID, in terms of median scores of the two observers: white [0–2.0], orange [2.0–2.7], yellow [2.7–3.4] and green [3.4–4.0]