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Table 3 Image quality results for 4:1 and 8:1 sphere-to-background ratio according to the NEMA NU2-2012 standard

From: Performance evaluation of the Biograph mCT Flow PET/CT system according to the NEMA NU2-2012 standard

Sphere diameter (mm)

Sphere-to-background ratio = 4:1

Sphere-to-background ratio = 8:1

Contrast recovery (%)

Background variability (%)

Contrast recovery (%)

Background variability (%)

OSEM mean (max/min)

PSF + TOF mean (max/min)

OSEM mean (max/min)

PSF + TOF mean (max/min)

OSEM mean (max/min)

PSF + TOF mean (max/min)

OSEM mean (max/min)

PSF + TOF mean (max/min)

10

21.5 (19.1/24.9)

28.5 (24.3/35.4)

5.6 (5.2/5.9)

4.7 (4.0/5.4)

35.3 (33.9/37.7)

42.4 (41.1/45.1)

5.7 (4.9/6.4)

5.5 (5.3/5.6)

13

33.4 (32.7/34.6)

42.3 (41.3/43.9)

4.8 (4.3/5.2)

4.3 (3.7/4.8)

51.5 (49.3/54.1)

63.6 (61.3/65.2)

5.0 (5.6/5.4)

4.8 (4.6/5.0)

17

47.8 (46.2/49.7)

58.4 (56.6/60.1)

3.9 (3.6/4.3)

3.7 (3.4/4.0)

59.6 (58.3/61.3)

68.9 (68.1/69.3)

4.1 (4.0/4.4)

4.1 (3.7/4.3)

22

62.1 (59.7/64.3)

71.7 (67.8/73.6)

3.2 (3.0/3.5)

3.4 (3.2/3.6)

69.9 (68.8/71.2)

76.7 (76.1/77.1)

3.4 (3.4/5.6)

3.4 (3.1/3.7)

28

61.2 (60.4/61.8)

70.1 (69.6/71.0)

2.7 (2.6/3.0)

3.2 (3.1/3.2)

61.8 (59.4/64.4)

70.6 (69.3/71.6)

2.8 (2.6/3.0)

2.9 (2.6/3.1)

37

67.9 (65.7/69.3)

78.3 (76.3/80.2)

2.3 (2.2/2.4)

3.0 (2.9/3.1)

68.2 (68.0/68.6)

78.5 (78.2/78.7)

2.1 (1.9/2.4)

2.5 (2.3/2.6)

Lung residual % (σ)

22.8 (1.6)

12.7 (1.4)

  

22.3 (1.5)

12.2 (1.2)