Dual-energy transmission systems

The method for converting dual-energy data into a color-coded image is a task that embodies many subtleties [64]. Conceptually, the X-ray image can be broken down according to an optimized attenuation, which sets a pixel s intensity, and Zgfp, which sets the hue. The optimized attenuation is a combination of HI and LO attenuations. Each pixel s attenuation is a composite of the attenuation produced by aU objects in that line s path from the X-ray source and to the corresponding detector. This projection X-ray view superimposes a 3-D collection of objects into a 2-D data-space representation. 

Dual-energy X-ray information allows for the estimation of Z -g on a pixel-by-pixel basis in the image [66]. Polychromatic beams from X-ray tubes undergo hardening as they pass through absorber, which compficates the computation of 

Methods for handling these compHcations were worked out in the early 1970s. In practice, a look-up table can assign hue to each HI/LO pair of attenuation measurements. Traditionally, orange is assigned to organic material 10), 

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