Table III.

Treatment and dose-volume parameters, monitor units, and beam-on times of the four TomoDirect plans for patients with locally advanced lung cancer.

	Mean ± standard deviation
	2.5-cm Dynamic	2.5-cm Fixed	p*	5.0-cm Dynamic	5.0-cm Fixed	p**	p***
Patient number			25
Total PTV (ml)			338.7 ± 179.0
Pitch	0.251			0.500
Modulation factor			2.0
Conformity index	12.5 ± 13.0	13.3 ± 13.8	0.002‡	11.3 ± 10.4	13.3 ± 12.3	0.77‡	0.08†
Uniformity index	1.09 ± 0.04	1.10 ± 0.05	0.003||	1.10 ± 0.05	1.11 ± 0.05	0.0001||	0.08§
Monitor unit	3509 ± 601	3417 ± 596	<0.0001‡	1912 ± 294	1806 ± 292	<0.0001‡	<0.0001†
Beam-on time (sec)	287.9 ± 42.1	281.3 ± 41.9	<0.0001‡	175.7 ± 20.6	168.3 ± 20.4	<0.0001‡	<0.0001†
Body
V5 Gy (ml)	4848.5 ± 1337.5	5197.4 ± 1402.4	<0.0001||	5220.2 ± 1442.8	6153.9 ± 1599.0	<0.0001||	<0.0001§
V10 Gy (ml)	4287.4 ± 1175.3	4602.2 ± 1241.8	<0.0001||	4628.7 ± 1282.5	5418.1 ± 1433.5	<0.0001||	<0.0001§
V20 Gy (ml)	3737.7 ± 1046.8	3929.5 ± 1089.1	<0.0001||	3999.5 ± 1134.9	4500.7 ± 1247.8	<0.0001||	<0.0001§
V30 Gy (ml)	3282.8 ± 933.6	3405.4 ± 972.5	<0.0001||	3488.7 ± 1000.2	3762.4 ± 1074.1	<0.0001||	<0.0001§
Spinal cord maximum (Gy)	43.3 ± 2.2	43.5 ± 2.4	0.11||	43.1 ± 2.2	43.1 ± 2.0	0.94||	0.09§
Esophagus maximum (Gy)	59.4 ± 2.2	59.0 ± 2.4	0.05||	58.2 ± 2.7	58.3 ± 2.8	0.27||	<0.0001§
Heart V40 Gy (%)	7.9 ± 7.7	8.3 ± 7.7	0.01||	10.4 ± 9.6	11.2 ± 9.6	0.02||	<0.0001§

Abbreviation: PTV: Planning target volume.

*p-value between 2.5-cm dynamic- and 2.5-cm fixed-jaw plans.

**p-value between 5.0-cm dynamic- and 5.0-cm fixed-jaw plans.

***p-value among the four plans.

^†Calculated by Friedman analysis of variance.

^‡Calculated by Wilcoxon signed-rank test.

^§Calculated by parametric analysis of variance for depended samples.

^||Calculated by paired t-test.