Table 3 Discrepancies between visual and quantitative assessments (above/below cut-off values for receptor positivity) for [¹⁸F]FES (A) and [¹⁸F]FDHT PET (B)

A [¹⁸F]FES

Observer 1

Observer 2

Visible (n= 64)

Not visible (n= 36)

Visible (n= 69)

Not visible (n= 38)

SUV_max ≥ 1.5

62 (97%)

16 (44%)

68 (99%)

15 (39%)

SUV_max < 1.5

2 (3%)

20 (56%)

1 (1%)

23 (61%)

SUV_peak ≥ 1.2

54 (84%)

19 (53%)

67 (97%)

16 (42%)

SUV_peak < 1.2

10 (16%)

17 (47%)

2 (3%)

22 (58%)

SUV_mean ≥ 1.1

57 (89%)

8 (22%)

67 (97%)

11 (29%)

SUV_mean < 1.1

7 (11%)

28 (78%)

2 (3%)

27 (71%)

B [¹⁸F]FDHT

Observer 1

Observer 2

Visible (n= 36)

Not visible (n= 62)

Visible (n= 37)

Not visible (n= 56)

SUV_max ≥ 1.9

31 (86%)

19 (31%)

32 (86%)

29 (52%)

SUV_max < 1.9

5 (14%)

43 (69%)

5 (14%)

27 (48%)

SUV_peak ≥ 1.6

30 (83%)

25 (40%)

33 (89%)

30 (54%)

SUV_peak < 1.6

6 (17%)

37 (60%)

4 (11%)

26 (46%)

SUV_mean ≥ 1.3

31 (86%)

20 (32%)

33 (89%)

30 (54%)

SUV_mean < 1.3

5 (14%)

42 (68%)

4 (11%)

26 (46%)