Table 2.

Size of set-up corrections and respective residuals proposed by OTS and PVS

	OTS correction	OTS residuals	Imaging correction	Imaging residuals	OTS discrepancy
	<Δ> ± σ	<Δ> ± σ	<Δ> ± σ	<Δ> ± σ	<Δ> ± σ
	[min/max]	[min/max]	[min/max]	[min/max]	[min/max]
CC (mm)	0.40 ± 1.29	–0.03 ± 0.40	0.22 ± 3.70	0.05 ± 1.14	–0.17 ± 3.65
	[–2.6/ + 4.0]	[–1.8/ + 3.1]	[–8.21/ + 9.49]	[–2.37/ + 3.96]	[–9.3/ + 8.1]
LL (mm)	–1.42 ± 3.61	0.09 ± 0.77	1.92 ± 2.57	–0.06 ± 1.41	–1.39 ± 2.52
	[–11.4/ + 10]	[–3.9/ + 1.9]	[–4.65/ + 9.60]	[–3.79/ + 4.16]	[–7.7/ + 4.93]
AP (mm)	1.44 ± 1.65	0.28 ± 0.69	1.72 ± 1.89	–0.17 ± 0.84	–1.07 ± 1.80
	[–3.1/ + 5.0]	[–1.9/ + 3.2]	[–3.28/ + 9.89]	[–3.35/ + 3.60]	[–6.7/ + 3.8]
Pitch (°)	–0.04 ± 0.56	–0.03 ± 0.11	0.12 ± 0.91	0.00 ± 0.64	–0.06 ± 0.85
	[–1.8/ + 1.8]	[–0.5/ + 0.3]	[–5.80/ + 2.35]	[–1.77/ + 2.04]	[–3.0/ + 2.2]
Roll (°)	–0.01 ± 0.39	0.01 ± 0.14	0.18 ± 0.99	0.03 ± 0.44	–0.15 ± 0.81
	[–1.2/ + 1.3]	[–0.5/ + 0.5]	[–2.49/ + 4.92]	[–1.24/ + 1.78]	[–2.4/ + 1.9]
Rotate (°)	–0.07 ± 0.20	0.00 ± 0.08	0.04 ± 0.66	–0.04 ± 0.56	–0.10 ± 0.64
	[–1.1/ + 0.5]	[–0.6/ + 0.2]	[–2.22/ + 2.37]	[–2.08/ + 1.12]	[–3.0/ + 1.6]

Data coming from the first 236 treatment sessions in pelvis localization are reported. CC = Cranio-caudal, LL = Latero-lateral, AP = Antero-posterior.