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Table 3 Mean pitch, yaw and roll rotational errors as determined from CBCT matches with the planning CT

From: The effect of prone and supine treatment positions for the pre-operative treatment of rectal cancer on organ-at-risk sparing and setup reproducibility using volumetric modulated arc therapy

Orientation

Pitch error (deg)

Yaw error (deg)

Roll error (deg)

Prone

1.97 ± 1.28

0.57 ± 0.49

1.04 ± 0.94

Supine

0.80 ± 1.08

0.46 ± 0.59

0.35 ± 0.53

p value

<0.001

0.35

<0.001

  1. The rotational data for a given direction (pitch, yaw, or roll) and patient orientation (prone or supine) were taken as the absolute value and then averaged together (i.e. the magnitudes of the rotational errors are averaged together). The ± appendages denote the standard deviation