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Table 4 Comparison between planned parotid dose and delivered parotid dose calculated using CBCT

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

p Planned vs CBCT 1 Planned vs. CBCT 2 Planned vs. CBCT 3 Planned vs. CBCT 4 Planned vs. CBCT 5
Right parotid
D50 (cGy) 0.13 0.64 0.02 0.004 0.01
Dmean (cGy) 0.22 0.80 0.13 0.004 0.34
V26 0.09 0.78 0.11 0.002 0.03
V32 0.32 0.94 0.07 0.01 0.03
Left parotid
D50 (cGy) 0.45 0.95 1.00 0.03 0.13
V26 0.21 0.38 0.11 0.002 0.01