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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