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Table 4 Relative differences in MTV for different segmentation algorithms (AT, T40, T50, T60) after coregistration

From: Influence of rigid coregistration of PET and CT data on metabolic volumetry: a user’s perspective

 

AT

T40

T50

T60

CT1 (RF)

    

  Mean

−0.5

0.1

0.2

0.5

  Median

0.7

0.2

0.3

0.7

  IQR

−3.0 to 2.7

−1.2 to 1.8

−1.8 to 2.7

−2.6 to 4.0

  Range

−12.7 to 9.2

−4.7 to 4.7

−5.8 to 4.3

−7.9 to 8.1

CT5 (RF)

    

  Mean

13.6

16.9

15.1

13.2

  Median

10.5

12.9

11.7

9.4

  IQR

7.4 to 16.7

9.1 to 21.2

7.8 to 17.2

4.8 to 15.4

  Range

−11.7 to 48.0

−1.9 to 51.6

−7.1 to 73.1

−10.0 to 64.5

CT1 (RS)

    

  Mean

−1.0

−0.9

−0.8

−1.1

  Median

−1.3

−1.0

−1.0

−1.3

  IQR

−3.6 to 0.9

−2.8 to 1.2

−2.5 to 1.4

−4.0 to 1.2

  Range

−16.1 to 14.1

−5.5 to 4.1

−5.6 to 5.3

−8.0 to 6.9

CT5 (RS)

    

  Mean

12.5

14.7

13.6

13.0

  Median

10.6

12.6

13.1

9.9

  IQR

5.4 to 17.7

8.1 to 23.4

7.4 to 18.6

3.4 to 17.8

  Range

−17.0 to 42.7

−9.5 to 44.0

−13.2 to 57.4

−5.8 to 66.8

  1. RF, rigid fast; RS, rigid slow; CT1, 1-mm-slice thickness; CT5, 5-mm-slice thickness.