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Table 1 Overview of the setup differences between AlignRT and CBCT (target volume and surface registered)

From: Evaluation of a 3D surface imaging system for deep inspiration breath-hold patient positioning and intra-fraction monitoring

 

AlignRT / CBCT target volume

AlignRT / CBCT surface

LR (mm)

CC (mm)

AP (mm)

LR (mm)

CC (mm)

AP (mm)

M

0.1

−0.5

1.7

0.1

0.6

0.4

Σ

1.8

1.4

1.9

1.0

1.4

1.5

σ

1.4

1.6

1.9

1.2

1.4

1.0

M - 1.96 x SD

−4.4

−4.3

−3.3

−2.8

−3.5

− 3.0

M + 1.96 x SD

4.5

3.2

6.6

3.1

4.7

3.8

R 2

0.43

0.53

0.35

0.74

0.44

0.64

  1. M Group mean, Σ The systematic error, σ The random error, M ± 1.96 x SD The 95% limits of agreement, R2 The Pearson correlation coefficient, LR Left-right, CC Cranial-caudal, AP Anterior-posterior