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Table 2 Centroid offset of target after target position alignment: Analysis of the correlation of the centroid offset among the three different users by using the linear mixed model

From: A patient-specific three-dimensional couplant pad for ultrasound image-guided radiation therapy: a feasibility study

  User 1 User 2 User 3 p-value
Without CP
 LR (mm) − 0.7 ± 2.2 −0.2 ± 2.1 − 1.2 ± 2.0 0.005
 AP (mm) 2.1 ± 2.8 1.5 ± 2.3 2.6 ± 3.2 0.002
 IS (mm) 0.2 ± 4.7 0.5 ± 3.9 − 1.8 ± 3.5 < 0.001
 3D (mm) 4.5 ± 4.4 3.9 ± 3.5 4.8 ± 3.8 0.020
With CP
 LR (mm) − 0.0 ± 1.4 0.3 ± 1.7 0.1 ± 1.8 0.081
 AP (mm) 0.5 ± 1.4 0.7 ± 1.5 0.8 ± 2.2 0.582
 IS (mm) −1.0 ± 3.2 − 0.6 ± 3.2 − 0.4 ± 3.5 0.194
 3D (mm) 2.7 ± 2.9 2.8 ± 2.9 3.3 ± 3.2 0.133
  1. Abbreviations: LR Left-Right, AP Anterior-Posterior, IS Inferior-Superior, 3D the amplitude of three-dimensional vector, CP Couplant Pad