Table 4.

Motion accuracy and reproducibility of moving the four‐dimensional intensity‐modulated/stereotactic body radiation therapy quality assurance device over projected motion kernels—10 minutes constant looping, 5.10 kg load, average over 3 trials.

Patient/plan	Gantry angle (degrees)	Time drift per cycle (%)
SBRT1	180	$-0.0069$
SBRT1	279	$-0.0074$
SBRT2	48	$-0.0016$
SBRT2	213	$-0.0005$