Table 2.

Novalis Tx and TrueBeam STx beam profile match analysis

Data	Depth (mm)	Field size (cm×cm)	Scan direction	Novalis Tx 5445	Novalis Tx 5479	Novalis Tx 6140	TrueBeam STx 3169
Energy 6 MV
Flatness (%)	15	10×10	Inline	2.3	2.4	2.4	2.4
			Crossline	0.7	0.6	0.9	0.6
		22×22	Inline	1.6	1.3	1.4	1.6
			Crossline	1.6	1.4	1.4	1.5
Symmetry (%)	15	10×10	Inline	0.1	0.1	0.0	0.0
			Crossline	0.1	0.1	0.0	0.0
		22×22	Inline	0.1	0.1	0.0	0.0
			Crossline	0.0	0.0	0.0	0.0
Penumbra (mm)	15	10×10	Inline	5.8	5.7	5.8	5.6
			Crossline	4.1	4.1	4.1	4.3
		22×22	Inline	4.7	4.8	4.8	4.8
			Crossline	4.3	4.3	4.3	4.3
Energy 10 MV
Flatness (%)	25	10×10	Inline		0.9	0.9	0.6
			Crossline		1.5	1.4	1.9
		22×22	Inline		1.4	1.3	1.7
			Crossline		1.0	1.1	0.9
Symmetry (%)	25	10×10	Inline		0.0	0.0	0.0
			Crossline		0.1	0.0	0.0
		22×22	Inline		0.1	0.0	0.0
			Crossline		0.3	0.0	0.0
Penumbra (mm)	25	10×10	Inline		5.2	5.2	5.2
			Crossline		5.3	5.4	5.2
		22×22	Inline		5.8	5.8	5.9
			Crossline		5.0	5.1	5.0