Table 4.

Geometric shifts as induced and as calculated by the localization software for the 8‐field prostate treatment plan.

Plan alignment/shifts	Nominal induced shift (cm)			Calculated shift (cm)
	LR	SI	AP	LR	SI	AP
Correct alignment	0	0	0	$-0.05$	0.04	$-0.01$
Vertical shift, 0.5 cm	0	0	0.5	0.00	0.10	0.42
Lateral shift, 0.5 cm	$-0.5$	00	$-0.66$	$-0.01$	$-0.06$
Rotation, Center detector	0	0	0	0.01	0.09	0.02
Rotation, Edge detector	$-1.67$	0	$-0.90$	$-1.83$	0.00	$-0.88$
Bolus on bottom	0	0	0	0.00	0.00	$-0.02$
Bolus on top	0	0	1.0	0.07	0.04	0.91

$\text{LR}=\text{left‐right}$; $\text{SI}=\text{superior‐inferior}$; $\text{AP}=\text{anterior‐posterior}$.

The induced shifts and calculated shifts in the corresponding direction are shown in bold text.