Table 3.

Isotropic setup margins and errors for left breast patients comparing SI to x ray positioning using both voluntary and spirometric‐DIBH

	This analysis	Conroy et al.14	Yang et al.15
DIBH Method	Voluntary	Voluntary	Spirometry
Imaging modality	SI	X ray	X ray
Number of patients	31	30	28
SD of systematic error (mm)	2.7	3.2	3.8
SD of random error (mm)	3.4	2.6	2.1
Setup margin (mm)	9.2	9.8	11.0