. Author manuscript; available in PMC: 2011 Sep 1.

Published in final edited form as: Int J Radiat Oncol Biol Phys. 2010 Apr 13;78(1):297–305. doi: 10.1016/j.ijrobp.2009.11.008

Table 1.

Performance assessment of the collimator apparatus.

Isocenter aperture	Near Stage			Far Stage
Isocenter aperture	Error	Closing time	Opening time	Error	Closing time	Opening time
16 mm	0.16%	19 sec	23 sec	0.01%	16 sec	16 sec
10 mm	0.25%	19 sec	24 sec	0.07%	19 sec	19 sec
5 mm	0.19%	24 sec	24 sec	0.24%	19 sec	19 sec
2 mm	0.79%	42 sec	26 sec	0.32%	24 sec	20 sec