Radiation Oncology

Table 5 Reduction of tumor movement in the upper and the lower lung field

From: Stereotactic body radiotherapy for stage I lung cancer and small lung metastasis: evaluation of an immobilization system for suppression of respiratory tumor movement and preliminary results

	Craniocaudal direction			Right-to-left direction
	Upper lung field			Upper lung field
	B – C†	B – D†	C – D†	B – C†	B – D†	C – D†
≤ - 3 mm	0	0	1	0	0	0
- 2 ≤, ≤ 2 mm	24	24	28	27	27	29
≥ 3 mm	5	5	0	2	2	0
p*	0.0044	0.0046	-	0.024	0.029	0.71
	Lower lung field			Lower lung field
	B – C†	B – D†	C – D†	B – C†	B – D†	C – D†
≤ - 3 mm	2	2	3	0	0	0
- 2 ≤, ≤ 2 mm	14	14	19	24	22	26
≥ 3 mm	10	10	4	2	4	0
p*	0.032	0.0071	0.48	0.016	0.0051	0.043

p*: Paired t-test for mean values of tumor movement.
X – Y†: Amplitude of tumor movement in condition X minus that in condition Y.

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ISSN: 1748-717X

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