“…Alotaibi and colleagues analysed 4099 PET-CT reports generated over an 18-month period at a tertiary care centre, and found that 2·2% contained an addendum that revealed a retrospectively discovered diagnostic error. 19 The true error rate for PET-CT reports by physicians, which would also include errors that go unnoticed, remains unknown, but is probably higher, given that for radiology tests in general, a human error rate of 3–5% has been estimated. 20 To achieve comparable sensitivity levels (eg, 95%) with our model, modification of the cutoff value between positive and negative scans, at the expense of specificity, might be an option ( table 2 ).…”