Table 2. The FWHM and penumbra for 10 mm and 5 mm collimators.

	10 mm collimator		5 mm collimator
	y direction	z direction	y direction	z direction
FWHM (mm)	10.9	10.9	5.5	5.5
Penumbra (mm)	1.1	1.5	1.1	1.5

Note: Measurements were repeated three times. The standard deviation was negligible.