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EJNMMI Physics

Table 2 Visual image quality and interobserver inter-rater reliability for each simulated activity reduction

From: Reduction of [68Ga]Ga-DOTA-TATE injected activity for digital PET/MR in comparison with analogue PET/CT

Simulated activity reduction

PET image quality

Nondiagnostic (0)

Poor (1)

Moderate (2)

Good (3)

Mean Score

Cohen’s Kappa

Reader

Reader

Reader

Reader

1

2

1

2

1

2

1

2

50%–β600

–

–

–

5

13

17

12

3

2.20*

0.05

33%–β450

–

–

–

1

19

9

6

15

2.40

0.04

17%–β450

–

–

–

1

10

2

15

22

2.72

0.27

0%–β300

–

–

–

–

17

3

8

22

2.60

0.12

  1. Statistically significant differences (p ≤ 0.05) in mean visual score compared with 0% simulated activity reduction with factor β = 300 determined by Friedman test with additional Dunn’s multiple comparisons test are indicated with asterisks
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