Table 1.

Characteristics of the flattening filter made of polyester

Sheet No.	$\mathit{\text{Dimensions XxY}}\hspace{0.17em}({\mathit{\text{cm}}}^2)$	X Distance from the Field Edge (cm)	Accumulated Polyester Thickness (mm)
1	$23.2\times 23.2$	0	0.15
2	$23.2\times 15$	2.4	0.30
3	$23.2\times 13$	3.2	0.45
4	$23.2\times 11$	3.8	0.60
5	$23.2\times 8.2$	4.9	0.75
6	$23.2\times 5$	5.8	0.90
7	$23.2\times 3.5$	6.4	1.05