Fig. 2.

A 63-year-old male with a 30-mm non–small cell carcinoma in the right upper lobe. A large variation between the observers and within observers was seen. Without BSI (upper) none of the observers called the nodule suspicious with a score above 50. With BSI (lower), five of the eight observers noted the nodule suspicious with a score above 50 in the sequential reading. In the two independent reading sessions, two and seven observers noted the nodule as suspicious with a score above 50. Only two observers noted the nodule in all three readings with BSI.