Table 2 The mean, median, standard deviation (STD) and range ([min, max]) of the absolute difference in the inter-marker distances (IDs) of the precisely located FMs between CT and MRI for all the single observers and for all the five observers

Single

1

0.8

0.6

0.7

[0.1, 3.1]

2

0.6

0.5

0.5

[0.0, 2.5]

3

0.7

0.6

0.5

[0.0, 2.1]

4

0.7

0.6

0.6

[0.1, 2.9]

5

0.7

0.5

0.6

[0.1, 2.5]

All

0.7

0.6

0.6

[0.0, 3.1]

Multiple

1

0.7

0.4

0.6

[0.0, 2.7]

2

0.6

0.4

0.6

[0.0, 3.0]

3

0.7

0.5

0.7

[0.0, 2.5]

4

0.7

0.5

0.6

[0.0, 2.8]

5

0.7

0.6

0.5

[0.0, 2.5]

All

0.6

0.5

0.6

[0.0, 3.0]