Table 4.

Normalised dosimetric differences $\mathrm{\Delta }{D}_{\mathrm{n}\mathrm{o}\mathrm{r}\mathrm{m}}$ (equation (2)), as well as dosimetric variability (section 2.4). A negative $\mathrm{\Delta }{D}_{\mathrm{n}\mathrm{o}\mathrm{r}\mathrm{m}}$ means a larger mean dose to gold standard structures. For a reference, we also include the inter-observer variability (IOV).

VOI	Approach	$\overline{\mathrm{\Delta }{D}_{\mathrm{n}\mathrm{o}\mathrm{r}\mathrm{m}}}$ (%)	IOV (%)
Right parotid	A	0.06  ±  12.93
	B	−0.84  ±  10.82	5.56  ±  4.78
	C	0.02  ±  10.26
Left parotid	A	−0.65  ±  11.39
	B	0.83  ±  6.51	6.00  ±  3.93
	C	0.68  ±  6.28
Spinal cord	A	0.95  ±  10.68
	B	−2.77  ±  6.64	4.76  ±  4.58
	C	−2.17  ±  7.41
Mandible	A	−0.66  ±  1.64
	B	−1.02  ±  0.85	0.46  ±  0.26
	C	−0.84  ±  1.18