Table 1 Volume and individual margin characteristics for the pCT target structures and the composite structures generated from contours on the CBCT images
Structure | PO | PSV | LN | ||||
|---|---|---|---|---|---|---|---|
Match type | Bone | ST | Bone | ST | Bone | ST | |
pCT CTV volume (cm3) | Average | 25.9 | 36.1 | 360.2 | |||
Std. Dev. | 10.5 | 14.1 | 55.2 | ||||
\( \frac{\mathrm{Composite}\ \mathrm{volume}}{pCT\kern0.5em \mathrm{volume}} \) | Average | 1.40 | 1.33 | 1.57 | 1.44 | 1.22 | 1.33 |
Std. Dev. | 0.23 | 0.24 | 0.36 | 0.26 | 0.16 | 0.22 | |
% overlap with 5 mm margin | Average | 93.4 | 98.0 | 90.5 | 96.6 | 95.9 | 93.6 |
Std. Dev. | 6.64 | 2.51 | 8.96 | 3.72 | 1.34 | 3.15 | |
95% overlap margin (mm) | Average (\( \overline{\mathrm{x}} \)) | 4.71 | 2.83 | 5.71 | 3.79 | 3.93 | 5.55 |
Std. Dev. (s) | 2.83 | 1.87 | 3.29 | 2.13 | 1.50 | 1.59 | |