TABLE 2.

Frequency at 10% MTF of the measured and simulated MTF, and the relative error of these frequencies in the different directions, positions, and focal spot sizes evaluated. Relative error = (simulation − measurement)/measurement * 100%.

Focal spot size	Direction	Position (cm)	Measured frequency (mm−1)	Simulated frequency (mm−1)	Relative error (%)
Large	Tangential	7	0.62	0.62	0.3
		14	0.57	0.57	1.2
		21	0.49	0.51	3.6
	Radial	7	0.62	0.65	3.8
		14	0.56	0.63	11.1
		21	0.37	0.38	2.6
Small	Tangential	7	0.72	0.70	−3.4
		14	0.64	0.63	−1.5
		21	0.55	0.55	0.8
	Radial	7	0.77	0.74	−3.3
		14	0.70	0.73	3.6
		21	0.41	0.39	−5.7