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Figure 4: Comparison of the shape and size of transmitted spectral energy distribution at ‘spectrally’ equivalent thicknesses of aluminum/copper and gadolinium fi lters. The values of the minimum root-mean-square error in the matching of hardening were found to be 24.5% for these aluminum and gadolinium fi lters and 44.4% for these copper and gadolinium fi lters. The gadolinium fi lter transmits more photons at energies below its k-edge than aluminum and copper fi lters. There is a signifi cant disparity in the hardening and attenuation properties of aluminum/copper (conventional fi lter) and those of gadolinium (k-edged fi lter)

Figure 4: Comparison of the shape and size of transmitted spectral energy
distribution at ‘spectrally’ equivalent thicknesses of aluminum/copper and
gadolinium fi lters. The values of the minimum root-mean-square error in
the matching of hardening were found to be 24.5% for these aluminum
and gadolinium fi lters and 44.4% for these copper and gadolinium fi lters.
The gadolinium fi lter transmits more photons at energies below its k-edge
than aluminum and copper fi lters. There is a signifi cant disparity in the
hardening and attenuation properties of aluminum/copper (conventional
fi lter) and those of gadolinium (k-edged fi lter)