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Table 6 Software comparison: absolute and relative error and correlation coefficient

From: Repeatability and reproducibility of various 4D Flow MRI postprocessing software programs in a multi-software and multi-vendor cross-over comparison study

 

SW-A/B

SW-A/C

SW-A/D

SW-B/C

SW-B/D

SW-C/D

Net stroke volume

Absolute error [ml]

7 ± 19

2 ± 6

5 ± 17

6 ± 20

0 ± 21

3 ± 17

Relative error [%]

9 ± 26

3 ± 8

6 ± 21

 − 7 ± 27

 − 1 ± 28

3 ± 21

ICC

0.591*

0.959***

0.634*

0.589*

0.466

0.664*

Peak flow

Absolute error [ml/s]

24 ± 92

5 ± 27

17 ± 25

 − 29 ± 92

4 ± 78

22 ± 25

Relative error [%]

7 ± 26

 − 1 ± 7

5 ± 7

 − 8 ± 26

1 ± 23

6 ± 7

ICC

0.631*

0.971***

0.972***

0.645*

0.718*

0.971***

Peak maximum velocity

Absolute error [cm/s]

 − 5 ± 27

 − 13 ± 28

 − 5 ± 14

 − 10 ± 26

2 ± 28

8 ± 29

Relative error [%]

 − 4 ± 21

 − 10 ± 20

 − 4 ± 10

 − 4 ± 19

1 ± 20

6 ± 20

ICC

0.258

0.248

0.797**

0.401

0.352

0.328

Peak average velocity

Absolute error [cm/s]

 − 8 ± 18

 − 6 ± 15

 − 8 ± 10

1 ± 17

 − 1 ± 17

 − 3 ± 11

Relative error [%]

 − 12 ± 25

 − 9 ± 21

 − 13 ± 15

1 ± 21

 − 2 ± 22

 − 4 ± 14

ICC

0.276

0.505*

0.697*

0.314

0.314

0.688*

Area

Absolute error [mm2]

31 ± 174

21 ± 147

66 ± 84

1 ± 207

43 ± 160

48 ± 131

Relative error [%]

5 ± 26

2 ± 22

12 ± 14

 − 1 ± 32

8 ± 27

10 ± 21

ICC

0.745*

0.805**

0.898**

0.614*

0.740*

0.807**

Peak WSS per segment

Absolute error [mPa]

395 ± 760

212 ± 437

505 ± 789

Relative error [%]

 − 17 ± 45

20 ± 31

32 ± 49

ICC

 

0.168

0.371

  

0.104

Peak WSS per contour

Absolute error [mPa]

716 ± 195

64 ± 553

595 ± 244

696 ± 496

 − 105 ± 126

502 ± 463

Relative error [%]

88 ± 16

14 ± 52

68 ± 22

 − 77 ± 46

 − 23 ± 26

50 ± 47

ICC

0.134

0.192

0.103

0.085

0.542*

0.092

  1. Absolute and relative error are given as mean ± standard deviation. Asterisks indicate ***excellent, **good, and *moderate intraclass correlation (ICC). No asterisk indicates poor agreement