Table 4.

Intra‐DIBH stability and intrafraction reproducibility from 31 left‐sided patients in this analysis compared to those of spirometry‐based results from seven patients as reported on in Fassi et al

	Intra‐DIBH variability (mm)			Intrafraction reproducibility (mm)
	A/P	S/I	R/L	A/P	S/I	R/L
Fassi et al. (n = 7) Surface monitoring + spirometry	1.37	1.78	0.74	2.16	2.30	1.88
This analysis (n = 31) SI + voluntary DIBH	0.66	0.58	0.49	2.17	1.98	1.52
% within 2 mm	72.1	76.3	84.6	–	–	–
% within 3 mm	98.2	98.8	99.6	74.6	76.0	88.4
% within 4 mm	99.4	99.6	100.0	88.1	89.5	95.7
% within 5 mm	–	–	–	94.9	96.5	98.2
% within 7 mm	–	–	–	99.2	99.5	99.6