Figure 2 | Scientific Reports

Figure 2

From: Monochromatic computed tomography with a compact laser-driven X-ray source

Figure 2

X-ray spectra for the experiment.

Black, blue and green lines: Spectra of the FR591 rotating anode X-ray tube at peak voltages of 20, 30 and 60 kVp calculated from the measured values of the linear absorption coefficient μ of the water phantom with an expectation maximization algorithm according to Sidky et al.9,10. Red line: Spectrum of the Compact Light Source at 21 keV calculated from the measured values of the linear absorption coefficient μ of the water phantom. For a measured spectrum of the CLS at 21 keV see Supplementary Fig. S1 online.

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