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. 2009 Dec 4;37(1):40–48. doi: 10.1118/1.3264616

Table 1.

The coefficients which were used to define a bow tie filter are listed. These coefficients lead to the computation of the thickness as a function of angle (in degrees) for the two filter components PMMA and aluminum.

Coefficient [Eq. 19] PMMA Aluminum
c1 0.3 0.8
c2 30 6
c3 45 48
c4 30 30
c5 10 10