Table 1 Mean ± SD of parallel imaging quality parameters (noise correlation coefficients, SNR₀, SNR_g, and 1/g) computed for the three arrays. The table lists the parameters for different phase encoding direction in 1D (LR or FH) and in 2D (LR and FH). Note the similar or better performance of the PET-MRI 32ch array compared to the MRI-only 32-channel array

0.110 ± 0.004

0.110 ± 0.002

0.120 ± 0.011

0.120 ± 0.004

0.120 ± 0.003

0.090 ± 0.003

0.100 ± 0.004

0.100 ± 0.001

0.110 ± 0.001

0.110 ± 0.002

0.150 ± 0.001

0.150 ± 0.021

0.150 ± 0.011

0.150 ± 0.001

0.160 ±0.001

  SNR₀

965 ± 112

–

–

–

–

871 ± 98

–

–

–

–

749 ± 90

–

–

–

–

  SNR_g

–

608 ± 57

428 ± 38

271 ± 25

88 ± 22

–

581 ± 71

386 ± 66

229 ± 34

55 ± 18

–

488 ± 58

247 ± 26

99 ± 7

24 ± 3

  g-factor

1

1.06 ± 0.05

1.25 ± 0.16

1.81 ± 0.54

7.03 ± 4.59

1

1.06 ± 0.05

1.32 ± 0.18

2.13 ± 0.79

15.41 ± 13.56

1

1.05 ± 0.04

2.10 ± 1.07

6.94 ± 5.42

41.75 ± 39.56

  1/g-factor

1

0.98 ± 0.04

0.82 ± 0.10

0.60 ± 0.16

0.23 ± 0.15

1

0.95 ± 0.04

0.77 ± 0.10

0.53 ± 0.17

0.16 ± 0.15

1

0.96 ± 0.04

0.59 ± 0.25

0.28 ± 0.24

0.08 ± 0.13

  SNR₀

929 ± 107

–

–

–

–

816 ± 96

–

–

–

–

655 ± 83

–

–

–

–

  SNR_g

–

648 ± 53

467 ± 35

279 ± 26

73 ± 19

–

549 ± 41

365 ± 59

216 ± 18

52 ± 12

–

443 ± 56

224 ± 23

90 ± 6

21 ± 2

  g-factor

1

1.01 ± 0.02

1.16 ± 0.11

1.82 ± 0.59

8.97 ± 6.27

1

1.06 ± 0.05

1.32 ± 0.17

2.12 ± 0.79

15.44 ± 13.54

1

1.05 ± 0.04

2.10 ± 1.06

6.93 ± 5.40

43.77 ± 41.75

  1/g-factor

1

0.99 ± 0.02

0.87 ± 0.08

0.60 ± 0.17

0.19 ± 0.16

1

0.95 ± 0.04

0.77 ± 0.10

0.53 ± 0.17

0.16 ± 0.15

1

0.96 ± 0.04

0.59 ± 0.25

0.27 ± 0.24

0.08 ± 0.13

 2D

R = 2 × 2

R = 2 × 3

R = 2 × 4

R = 3 × 3

R = 3 × 4

R = 2 × 2

R = 2 × 3

R = 2 × 4

R = 3 × 3

R = 3 × 4

R = 2 × 2

R = 2 × 3

R = 2 × 4

R = 3 × 3

R = 3 × 4

  SNR_g

572 ± 23

404 ± 21

237 ± 16

324 ± 19

192 ± 14

623 ± 26

406 ± 19

233 ± 15

330 ± 16

198 ± 13

427 ± 21

196 ± 15

64 ± 14

132 ± 16

42 ± 9

  g-factor

1.05 ± 0.03

1.23 ± 0.14

1.97 ± 0.66

1.59 ± 0.36

2.52 ± 0.94

1.06 ± 0.03

1.35 ± 0.18

2.28 ± 0.88

1.72 ± 0.42

2.73 ± 1.14

1.12 ± 0.06

2.75 ± 1.89

10.16 ± 5.84

5.41 ± 4.86

18.51 ± 13.03

  1/g-factor

0.95 ± 0.03

0.82 ± 0.09

0.56 ± 0.16

0.66 ± 0.13

0.45 ± 0.15

0.94 ± 0.03

0.75 ± 0.10

0.50 ± 0.16

0.61 ± 0.13

0.42 ± 0.14

0.89 ± 0.05

0.50 ± 0.24

0.19 ± 0.22

0.34 ± 0.21

0.13 ± 0.16