Table 4.

Effect of rotational setup errors on target coverage in IMRT for SRT (unit: %volume).

		$\mathit{\text{CTV}}{\mathrm{V}}_{100\text{Rx}}(\%)$					$\mathit{\text{CTV}}{\mathrm{V}}_{93\text{Rx}}(\%)$
Case #	PTV Shape	Original	$\pm 1°$	$\pm 3°$	$\pm 5°$	$\pm 7°$	Original	$\pm 1°$	$\pm 3°$	$\pm 5°$	$\pm 7°$
1	Irregular	99.6	99.1	95.7	87.2	76.1	100.0	100.0	100.0	98.2	92.0
2	Ellipse	99.8	99.3	95.6	88.6	77.2	100.0	100.0	100.0	100.0	98.3
3	Ellipse	99.2	95.8	92.7	86.1	79.3	100.0	100.0	100.0	97.7	92.7
4	Sphere	99.8	99.1	96.8	93.8	86.9	100.0	100.0	100.0	100.0	99.7
5	Sphere	100.0	99.8	97.9	92.5	85.3	100.0	100.0	100.0	100.0	99.8
6	Sphere	99.0	98.9	98.4	95.9	96.2	100.0	100.0	100.0	99.9	100.0
7	Ellipse	98.4	97.8	97.6	96.4	93.0	100.0	99.9	100.0	100.0	99.9
8	Sphere	99.2	98.3	98.0	96.3	93.3	100.0	100.0	100.0	100.0	100.0
9	Ellipse	98.6	98.8	98.7	97.9	96.4	100.0	100.0	100.0	100.0	99.9
10	Sphere	99.0	99.0	98.2	96.7	94.1	100.0	100.0	100.0	100.0	99.0
Average	$99.3\pm$	$98.6\pm$	$97.0\pm$	$93.1\pm$	$87.8\pm$	$100.0\pm$	$100.0\pm$	$100.0\pm$	$99.6\pm$	$98.1\pm$
	0.5	1.6	2.0	4.6	14.2	0.1	0.0	0.0	0.6	4.7

${\mathrm{V}}_{100\text{Rx}},{\mathrm{V}}_{93\text{Rx}}$ = percentage volume receiving 100% and 93% of prescribed dose, respectively.