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Table 2 Average volume changes from the planning CT to the CBCTs

From: CBCT-based volumetric and dosimetric variation evaluation of volumetric modulated arc radiotherapy in the treatment of nasopharyngeal cancer patients

Volume (cm3) GTV CTV Brainstem Cord Right parotid Left parotid
Planning CT 67.1 ± 58.7 577.0 ± 137.5 27.7 ± 2.3 13.6 ± 4.7 26.7 ± 6.3 25.7 ± 7.3
CBCT 1 66.4 ± 59.2 512.3 ± 130.9 27.5 ± 2.4 12.5 ± 2.2 24.9 ± 6.9 24.1 ± 6.6
CBCT 2 66.5 ± 58.6 525.2 ± 138.7 28.5 ± 3.7 13.6 ± 5.0 24.0 ± 5.8 23.3 ± 6.8
CBCT 3 66.0 ± 57.5 520.6 ± 141.7 27.4 ± 2.3 12.9 ± 3.3 23.3 ± 5.9 22.2 ± 7.1
CBCT 4 64.4 ± 57.0 500.9 ± 125.0 26.9 ± 2.3 12.6 ± 2.2 22.3 ± 5.7 20.9 ± 6.3
CBCT 5 65.9 ± 57.8 506.6 ± 137.5 26.8 ± 3.5 13.8 ± 3.6 20.5 ± 4.9 19.6 ± 6.2