Table 1 Mean percentage difference between the reconstructed and the true emission images and SD for each tissue type obtained for all configurations included in this study. Reference configuration corresponds to proposed MLAA with reference object defined as one water cylinder (cyl) filled with A₀ activity concentration, CRT = 300 ps and 10⁷ coincidences. Results obtained with fixed attenuation values in air pixels (F.A.) are included below

Standard MLAA

− 66.4

3.1

− 64.5

3.6

− 57.7

9.7

− 60.7

7.0

Reference

3.3

9.3

6.7

9.1

8.1

14.3

9.1

12.6

A = 0

54.4

14.0

61.0

13.4

59.6

21.5

64.8

19.4

A = A₀/2

7.8

9.5

13.1

9.1

14.1

15.0

15.4

13.5

A = A₀·2

− 0.8

9.4

3.2

8.4

4.5

13.2

5.5

13.5

Lung cyl

155.3

24.5

166.1

21.4

177.3

43.4

174.8

40.4

None cyl

− 1.9

8.8

3.8

8.6

5.3

13.5

5.7

12.8

2 water cyl

1.8

9.3

6.2

8.4

7.6

14.3

8.7

13.2

4 water cyl

1.9

9.5

6.2

9.1

8.6

14.3

8.9

13.7

100 ps, 10⁵

83.3

68.9

73.5

74.8

78.5

102.0

78.7

91.6

300 ps, 10⁵

104.2

153.0

120.2

148.4

124.5

194.1

126.7

195.0

540 ps, 10⁵

85.3

159.1

96.7

160.8

115.2

221.8

118.1

225.5

100 ps, 10⁶

15.3

14.9

17.2

16.1

17.9

21.8

17.4

19.9

300 ps, 10⁶

13.8

25.0

16.5

29.0

19.0

38.8

18.8

41.8

540 ps, 10⁶

40.7

48.6

51.2

47.6

57.1

67.7

61.5

75.9

100 ps, 10⁷

5.9

4.4

7.0

4.7

7.4

7.0

7.7

6.1

540 ps, 10⁷

− 2.6

15.9

8.4

13.2

11.9

19.5

16.2

22.2

Reference F.A.

7.0

9.0

8.4

10.7

7.5

20.5

9.8

14.4

Lung cyl F.A.

− 0.2

7.9

1.7

9.6

− 0.4

15.0

1.9

12.1

Bone cyl F.A.

9.6

9.0

10.6

10.4

10.0

21.8

11.7

14.2

A = 0 F.A.

15.2

9.9

17.7

11.2

13.9

23.0

18.7

15.9

A = A₀/2 F.A.

16.8

9.0

18.4

11.3

15.5

22.6

19.5

16.9

A = A₀·2 F.A.

− 1.7

8.9

0.0

9.3

− 0.4

17.6

1.3

14.2