Organ-at-risk sparing with dynamic trajectory radiotherapy for head and neck cancer: comparison with volumetric arc therapy on a publicly available library of cases

Table 2 Deviations between expected and actual angle/position for DTRT deliveries

Axis	Root-mean-square (RMS) difference	Maximum difference	Correlation between speed and deviation
Gantry angle (°)	0.02	0.13	0.16, p < < 0.01
Table angle (°)	0.12	0.16	< -0.99, p < < 0.01
Collimator angle (°)	0.03	0.17	< -0.99, p < < 0.01
	RMS deviation over all moving leaves
	Mean RMS	Max RMS
MLC leaves position (mm)	0.17	0.28

ISSN: 1748-717X