Table 2.

Main lung phantom error types grouped by respiratory motion management technique. Values are represented as a fraction of all irradiated IROC lung phantoms irradiated with that type of motion management within the time period (2012–2018). Combination and global error categories were excluded due to the specific and unique nature of these failures.

	RESPIRATORY MOTION TECHNIQUE
Error Type	Free breathing (ITV)	95% C.I. (%)	Gating	95% C.I. (%)	Static	95% C.I. (%)	Tracking	95% C.I. (%)
Dose (over, under and local)	$\frac{23}{466}\left(5\%\right)$	(3,7)	$\frac{5}{125}\left(4\%\right)$	(2,9)	$\frac{7}{391}\left(2\%\right)$	(1,4)	$\frac{0}{35}\left(0\%\right)$	(0,10)
SI localization	$\frac{47}{466}\left(10\%\right)$	(8,13)	$\frac{16}{125}\left(13\%\right)$	(8,20)	$\frac{1}{391}\left(0.3\%\right)$*	(0,1)	$\frac{0}{35}\left(0\%\right)$	(0,10)
Other	$\frac{10}{466}\left(2\%\right)$	(1,4)	$\frac{3}{125}\left(2\%\right)$	(1,7)	$\frac{1}{391}\left(0.3\%\right)$	(0,1)	$\frac{0}{35}\left(0\%\right)$	(0,10)
localization

^*p<<0.001, Fisher’s exact test for pairwise comparisons of ITV, gating and static respiratory motion management techniques for SI localization failures