Table 1.

Patient characteristics and planning states. Using the SIB technique, two or three dose levels are defined for each patient, except for patients with rectal cancer

Disease Site	Number of Patients	Dose Levels	Monitor Units	Average Field Width (mm)	Average Leaf Travel (a) (mm)	Average Leaf Travel Speed (b) (mm/s)
Esophageal	3	2	$497\pm 108$	$37\pm 5$	$579\pm 75$	$3.8\pm 0.6$
Prostate (c)	1	2	1316	51	848	5.4
Cervix uteri	1	2	906	49	818	5.0
Rectal	3	1	$1259\pm 136$	$82\pm 8$	$610\pm 57$	$4.2\pm 0.3$
NPC (d)	3	3	$668\pm 65$	$26\pm 1$	$1418\pm 121$	$4.5\pm 0.3$

^aAverage leaf travel is calculated over all leaves, excluding leaves which remain closed over all treatment.

^bAverage leaf travel speed is average leaf travel divided by delivery time.

^cThe prostate plan is a whole pelvis and prostate boost plan.

^dThe treatment volume for NPC included all sites: primary, upper, and lower neck with a single VMAT plan.