Test-retest performance of the most successful KF versions and of A50%. Percentage metabolically active tumour volume variability (A), absolute metabolically active tumour volume difference (B), percentage SUV variability (C) and absolute SUV difference (D). Per KF version, the A50% TRT performance is shown for those lesions that were detected by the specific KF version. KF versions are listed in Table 1. KF, kinetic filtering; SUV, standard uptake value.