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Table 3 Summary of dosimetric errors in the CTV and OARs for skull base tumor throughout the course of VMDWAT. Values are shown in means ± two standard deviations for the signed difference and those for the absolute difference in parentheses

From: Monitoring of mechanical errors and their dosimetric impact throughout the course of non-coplanar continuous volumetric-modulated arc therapy

Patient CTV Chiasm Right optic nerve Left optic nerve
D99% (%) Dmean (%) D1% (%) D2% (%) Dmean (%) D2% (%) Dmean (%) D2% (%) Dmean (%)
1 0.2 ± 0.5
[0.2 ± 0.4]
0.3 ± 0.6
[0.3 ± 0.6]
0.3 ± 0.6
[0.3 ± 0.6]
0.2 ± 0.2
[0.2 ± 0.2]
0.4 ± 0.4
[0.4 ± 0.4]
0.4 ± 0.2
[0.4 ± 0.3]
−0.1 ± 0.5
[0.2 ± 0.4]
0.1 ± 1.3
[0.5 ± 1.0]
1.4 ± 1.1
[1.4 ± 1.1]
2 0.1 ± 0.4
[0.1 ± 0.4]
0.0 ± 0.5
[0.2 ± 0.3]
0.1 ± 0.7
[0.3 ± 0.5]
0.1 ± 0.6
[0.2 ± 0.5]
0.1 ± 0.5
[0.2 ± 0.4]
0.2 ± 0.4
[0.2 ± 0.4]
−0.4 ± 0.3
[0.4 ± 0.3]
0.1 ± 0.4
[0.2 ± 0.3]
0.0 ± 0.3
[0.1 ± 0.2]
  1. Abbreviations: CTV clinical target volume, OARs organs at risk, VMDWAT volumetric-modulated Dynamic WaveArc therapy, D mean mean dose, D xx% dose covering xx% volume