Table 1.

Some characteristics such as the nominal megavoltage, wedge angle, and MU/min of the linac beams by Varian, Elekta, and Siemens. All the linacs used aSi EPIDs. The range MU/min used in clinical routine in the centers are underlined.

Linacs	Clinac 2100 Varian						Elekta Precise					Siemens Oncor
Nominal Megavoltage (MV)		6	10		15		6		10		15	6	10		15
Range MU/min	100	200	300	400 a	500	600	80	160	240	360	400	50	200	300	500
Wedge Angle (°)		15	30	45	60				60			15	30	45	60
Wedgep Position	external						internal					external
aSi‐EPIDs Pixel Resolution Pitch (μm)	aS1000 $1024\times 768$ 392			aS500 $512\times 384$ 784			XRD 1640 AL5 $1024\times 1024$ 400					OptiVue 1000ST $512\times 512$ 800
Plate material Thickness Plate (mm)	Copper 1						Copper 1					Aluminum 1
SED range (cm)	110–160						158.2–159.5					115–160

^aThe range MU/min used in clinical routine in the centers are underlined.