Table 2.

Maximum‐count‐rate (million counts per second per square millimeter, Mcps/mm²)

	Conventional filter		FDBF (ZnBr2 solution)	Piecewise‐linear bowtie
	aMin. max‐count‐rate +dose	bMin. max‐count‐rate
Chest	48.1	40.7	1.6	4.7
Abdomen	44.0	40.3	1.0	2.2
Shoulder	111.4	98.1	1.1	5.1
Average	67.8	59.7	1.2	4.0
cAverage fluence reduction	48.4%	49.3%	97.7%	95.1%

^aConventional filter with TCM for minimized sum of maximum‐count‐rate and entrance‐energy‐fluence.

^bConventional filter with TCM for minimized maximum‐count‐rate.

^cAverage percent fluence reduction, which was calculated from $\frac{p-q}{p}\times 100$, where p is fluence with object but without filter and q is fluence with object and filter. The fluence was greatly reduced in the FDBF and piecewise‐linear bowtie cases since no TCM was applied. In other words, constant mA was assumed, and all flux modulation was done by the filter itself.