Table 2.

Absolute (abs) pitch and roll adjustments (mean ± standard deviation) for brain, lung, prostate, pancreas, liver and prostate tumours

Organ	Pitch (°)	Roll (°)	Pitch abs (°)	Roll abs (°)	(P + R)  > 0.5° (%)	(P + R)  > 1° (%)	(P + R)  > 2° (%)
Brain (B)	−0.20 ± 0.99	0.11 ± 1.11	0.73 ± 0.69	0.80 ± 0.78	79.8	61.0	29.1
Lung (L)	0.06 ± 0.95	−0.07 ± 0.97	0.60 ± 0.74	0.64 ± 0.74	64.5	50.2	24.4
Pancreas (P)	−0.19 ± 0.56	0.32 ± 0.69	0.36 ± 0.47	0.49 ± 0.58	56.7	39.4	6.7
Liver (Li)	−0.22 ± 0.84	0.30 ± 0.85	0.49 ± 0.72	0.56 ± 0.70	56.4	41.7	20.5
Prostate (Pr)	0.26 ± 0.91	0.24 ± 0.73	0.61 ± 0.72	0.54 ± 0.55	68.8	47.5	18.1
Total (T)	−0.09 ± 0.94	0.11 ± 1.00	0.63 ± 0.70	0.68 ± 0.74	70.1	53.0	24.2

(P + R) = sum of the absolute pitch and roll rotations.

Collective corrections (i.e. pitch + roll) >0.5°, >1.0° and >2.0° for the same sites are also reported. The p-values of the Kolmogorov–Smirnov test between the different groups of patients were: for B-L, B-P, B-Li and B-Pr (p < 0.01); and for L-P, L-Li, L-Pr, P-Li, P-Pr and Li-Pr (p > 0.01).