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Table 2 Relative errors calculated between the in-house and the commercial software for the analysed parameters, including mean relative error for every parameter and mean relative error considering the absolute values

From: Optimisation of ultrasound liver perfusion through a digital reference object and analysis tool

Case number

Relative error (%)

MTT

AUC

MI

TTP

1

7.08

- 12.12

5.50

5.84

2

- 1.94

12.01

- 3.55

6.41

3

- 8.94

25.27

- 17.13

- 1.13

4

- 1.57

- 9.05

- 2.25

28.64

5

- 25.89

22.68

- 37.78

17.29

6

- 4.80

49.91

- 8.66

- 24.64

7

10.53

22.66

17.36

- 13.79

8

- 9.63

- 64.09

- 3.87

- 29.61

9

- 19.58

- 40.41

- 23.16

9.71

10

16.39

12.88

21.11

9.31

11

- 6.34

15.59

- 7.57

- 4.80

12

18.57

8.08

14.86

5.66

13

8.52

18.91

4.46

3.84

Mean

- 1.35

4.79

- 3.13

0.97

Mean absolute

10.75

24.13

12.87

12.36

  1. MTT mean transit time, AUC area under the curve, MI maximum intensity, TTP time to peak