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Table 2 Summary of phantom results for the two segmentation methods and the two PS realizations

From: Impact of 90Y PET gradient-based tumor segmentation on voxel-level dosimetry in liver radioembolization

  Sphere 8 cm3 Sphere 16 cm3 Ovoid 29 cm3 Sphere 60 cm3 (warm) Sphere 60 cm3 (cold)
MS volume (cm3) 8.2 15.6 29.8 61.6 61.6
PS volume (cm3)a 9.4, 9.3 17.6, 17.4 28.7, 28.7 56.4, 56.4 61.7, 61.0
bPS vs MS
 DSC 0.87 0.86 0.86 0.93 0.97
 MDA (mm) 1.20 1.47 1.40 1.20 0.63
 ΔDMean (%) − 4.7 − 2.4 1.8 3.5 0.7
 ΔD70 (%) − 7.7 − 4.2 3.1 7.4 1.1
 ΔD90 (%) − 7.5 0.8 4.5 8.3 3.0
PS1 vs PS2
 DSC 0.99 0.99 1.0 0.99 1.0
 MDA (mm) 0.15 0.14 0.07 0.15 0.07
 ΔDMean (%) 0.3 0.5 0.0 − 0.1 0.6
 ΔD70 (%) 0.5 0.9 − 0.1 − 0.1 1.3
 ΔD90(%) 0.4 1.5 − 0.1 − 0.4 2.2
  1. aRealization 1 and 2
  2. bPS realization with worst agreement tabulated. Δ represents the relative difference in the reported dose metric with respect to the MS value