Table 1. Simulated Truebeam® multi-leaf collimator (TB MLC) with different parameters from the Halcyon™ dual-layer MLC. The parameters inside the bracket are simulated hypothetical MLC parameters, including leaf width, dosimetric leaf gap (DLG), leaf speed, and transmission. Values used here were based on pre-clinical system and might be different from clinical system.

	Leaf Width	DLG	Leaf Speed	Transmission
TB MLC DLG Matched	0.5 cm	(0.01 mm)	2.5 cm/s	1.5%
TB MLC Leaf Speed Matched	0.5 cm	0.13 mm	(5.0 cm/s)	1.5%
TB MLC Transmission Matched	0.5 cm	0.13 mm	2.5 cm/s	(0.7%)
TB MLC All 3 Matched	0.5 cm	(0.01 mm)	(5.0 cm/s)	(0.7%)
Halcyon Dual-Layer MLC	1.0 cm	0.01 mm	5.0 cm/s	0.7%