Figure 4 | Scientific Reports

Figure 4

From: Localising functionalised gold-nanoparticles in murine spinal cords by X-ray fluorescence imaging and background-reduction through spatial filtering for human-sized objects

Figure 4

Spatial distribution of the strongly anisotropic Compton background and result of spatial filtering. In (a) no spatial filtering is applied, while (b) shows spatial filtering exhibiting the highest overall signal significance with the optimum of 85 keV incident energy, using spherical detector coordinates. One can also see the influence of linear polarisation in the azimuthal angle Φ (Φ and cos(Θ) are given with respect to the beam direction). Note that the colour scale varies from (a) to (b) by almost three orders of magnitude, with the total entries reduced by a factor of 570. A white colour means “discarded pixel”, i.e. such a pixel is removed from contributing to the sum spectrum.

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