Table 2.

Fixed parameters used for the optimization.

Number of incident photons	$1\times {10}^7$
Source-to-sample distance (mm)	400
Sample-to-detector distance (mm)	200
Spectrum	Measured x-ray spectrum at 47 kV with $138\text{-}\mu \mathrm{m}$ Zr filter
Pixel size (mm)	2
Number of pixels in the intensity profile for contrast calculation	25 ($5\times 5\text{pixels}$)