Average ROI counts for each sphere j, C_H,j

16:1

8:1

4:1

No background

Lung insert

1540.4

2000

4107.4

100.4

37 mm Cold Sphere

1217.4

1225

2753

9.8

28 mm hot sphere

7772.8

3186.6

4078

2678.6

22 mm hot sphere

4408.6

1778.4

2572.4

1426.8

17 mm hot sphere

2101.4

940.2

1575.8

557

13 mm hot sphere

1161.8

844.2

1234.2

332.6

10 mm hot sphere

551

376.6

739

112.8