Table 1.

DIBH volume, achieved single breath‐hold lengths of breath‐hold during treatment and relative heart shifts from FB to DIBH in “AP” and SI directions

Measurements	DIBH Volume (L)	Single Breath‐hold Lengths (s)	Heart Shift in “AP” (cm)	Heart Shift in SI (cm)
$v\pm \sigma$	$1.9\pm 0.5$	$25.2\pm 4.1$	$1.3\pm 0.7$	$3.2\pm 0.8$
(range)	(0.9–2.6)	(16.0–34.6)	(0.1–2.5)	(1.5–5.0)

Average of the patient cohort; $\sigma =\text{standard deviation of the patient cohort}$; $\text{FB}=\text{free breathing}$; $\text{DIBH}=\text{deep inhalation breath hold}$; $\text{SI}=\text{superior}‐\text{inferior}$; $“\text{AP}”=\text{the direction perpendicular to the SI direction on the DRR and MV portal images}$.