Table 2.

Quantitative registration evaluation for the mandible and the parotid glands between the artificial planning CT and daily CT images shown in Fig. 4. The registration error was evaluated by comparing the calculated deformation against the known deformation generated randomly from the variation models.

Simulation Set	Organ	$Daily\hspace{0.17em}CT\hspace{0.17em}{D}_{\mathit{\text{max}}}=2.0\hspace{0.17em}Mean\pm SD\hspace{0.17em}(mm)$	$Daily\hspace{0.17em}CT\hspace{0.17em}{D}_{\mathit{\text{max}}}=3.5\hspace{0.17em}Mean\pm SD\hspace{0.17em}(mm)$	$Daily\hspace{0.17em}CT\hspace{0.17em}{D}_{\mathit{\text{max}}}=4.5\hspace{0.17em}Mean\pm SD\hspace{0.17em}(mm)$
	Left parotid	$0.74\pm 0.49$	$1.06\pm 0.62$	$0.71\pm 0.46$
1	Right parotid	$0.69\pm 0.51$	$1.05\pm 0.81$	$0.75\pm 0.55$
	Mandible	$0.68\pm 0.38$	$0.96\pm 0.54$	$0.96\pm 0.58$
	Left parotid	$0.69\pm 0.79$	$0.78\pm 0.67$	$0.83\pm 0.68$
2	Right parotid	$0.60\pm 0.48$	$0.73\pm 0.58$	$0.93\pm 0.64$
	Mandible	$0.71\pm 0.39$	$0.85\pm 0.52$	$0.98\pm 0.61$