Figure 7.

The following three energy spectra for a tube setting of 80 kVp are shown: the mean energy spectrum measured by all of the comparators of DXMCT-1 (labeled N_PCXD[E] in the figure); the energy spectrum predicted by the model of the spectral distortion caused by pulse pileup effects with the nonparalyzable detection model (labeled N_Model[E]); and the scaled incident spectrum, a_R×S₀(E). The estimated incident count rate and deadtime loss ratio under the four tube current settings were 3.1 Mcps∕mm² and 31% loss at 100 μA, 6.2 Mcps∕mm² and 48% loss at 200 μA, 9.3 Mcps∕mm² and 58% loss at 300 μA, and 12.4 Mcps∕mm² and 64% loss at 400 μA.