Dual-energy medical X-ray imaging using LaPlace transformation

Dual-energy Medical X-ray imaging is an important tool of medical diagnosis, capable of obtaining not only spatial information but also chemical compositions of imaging object. Presently almost all of computation methods of dual-energy imaging are still based on the model of mono-energy spectrum imaging with some linear calibration, and so they are incapable of reflecting accurately the physical characteristics of dual-energy imaging. In paper a revision of computational method was presented by combining Computable physics model of medical X-ray imaging with the method obtaining 'global quantities' presented by V.Delgado and P.Ortiz. Consequently, the complex reconstruction of Imaging Spectrum Function may be omitted. The simulation experiments show that such method has quite a satisfactory precision in theory, under the condition of that Ψ̃, the estimate of the two element mapping Ψ has been acquired through elaborate measurements, and ψ̃ = ψ perfectly.