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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.