Table 3 Statistical significances of the absolute differences in image quality parameters between chosen and discarded acquisitions from zero.

From: Automated image quality assessment for selecting among multiple magnetic resonance image acquisitions in the German National Cohort study

Protocol

UQI

Sharpness

SNR

Specific SNR

Structured noise max

Structured noise avg

N/2 ghosting max

N/2 ghosting avg

Drift

Variation over time

Foreground ratio

All

0.86

1396

 < 0.001

1396

0.003

1374

 < 0.001

281

 < 0.001

796

 < 0.001

796

 < 0.001

808

 < 0.001

808

-

1

-

1

0.04

1374

T1w 3D MPRAGE

0.002

87

 < 0.001

87

 < 0.001

87

0.83

87

0.001

87

 < 0.001

87

0.17

87

0.06

87

NA

NA

0.18

87

2D FLAIR

 < 0.001

191

 < 0.001

191

 < 0.001

191

 < 0.001

191

 < 0.001

191

 < 0.001

191

 < 0.001

191

 < 0.001

191

NA

NA

 < 0.001

191

Resting state EPI BOLD

-

1

-

1

-

1

-

1

-

1

-

1

-

1

-

1

-

1

-

1

-

1

MRA 3D SPACE STIR

0.79

20

0.93

20

NA

NA

NA

NA

NA

NA

NA

NA

NA

Cine SSFP LAX 2Ch

0.24

303

0.16

303

0.90

303

NA

0.47

14

0.47

14

0.50

16

0.50

16

NA

NA

0.90

303

Cine SSFP LAX 3Ch

0.32

306

 < 0.001

306

0.004

306

NA

 < 0.001

264

 < 0.001

264

 < 0.001

267

 < 0.001

267

NA

NA

0.002

306

Cine SSFP LAX 4Ch

0.08

305

 < 0.001

305

0.67

305

NA

0.30

71

0.30

71

0.88

79

0.88

79

NA

NA

0.65

305

Cine SSFP SAX

0.01

63

0.008

63

0.42

63

NA

0.04

59

0.03

59

0.07

59

0.006

59

NA

NA

0.49

63

MOLLI

0.15

6

0.03

6

0.64

6

NA

-

2

-

2

-

1

-

1

NA

NA

0.37

6

T2w HASTE

0.60

29

0.39

29

0.70

29

NA

0.33

29

0.71

29

0.18

29

0.48

29

NA

NA

0.03

29

T1w 3D VIBE DIXON

0.04

52

0.15

52

0.38

52

NA

0.14

52

0.76

52

0.06

52

0.96

52

NA

NA

0.14

52

Multiecho 3D VIBE

0.001

29

0.25

29

0.12

29

NA

0.93

24

0.76

24

0.66

24

0.18

24

NA

NA

0.03

29

PDw FS 3D SPACE

-

2

-

2

NA

NA

NA

NA

NA

NA

NA

NA

NA

T2w 2D FSE

-

2

-

2

-

2

-

2

-

2

-

2

-

2

-

2

NA

NA

-

2

  1. P-values (upper row) and number of comparisons (lower row) are from a paired t-test or signed rank test depending on normality. Note that this table considers only repetitions that retained the setup of the initial acquisition, and compares only initial acquisitions to repetitions, not repetitions to repetitions – therefore and because, for technical reasons, the quantitative image quality parameters were not derived from every acquisition, the number of comparisons may differ from the underlying series of initial acquisitions and repetitions shown in Table 1.
  2. Bold denotes statistical significance at p < 0.05. NA not available.