title: A system for dual-energy radiography.
abstract: A system has been developed and theoretically analysed for the generation of chemical information from conventional radiography. A specially modified cassette has enabled dual-energy radiographs to be taken during a single exposure. A simple theoretical model has demonstrated that the concept of an optical density "standardised" to the local surroundings allows adequate quantification of the dual-energy radiographs. Using this method, data can be obtained relating to the effective atomic number of a radiographed material provided some estimate of its physical density is known. Simulated in vivo analysis of gall-stone composition has been demonstrated using these techniques.
mesh_terms: D002138:Calibration; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D002769:Cholelithiasis / Q000000981:diagnostic imaging / Q000378:metabolism; D005374:Filtration / Q000379:methods; D006801:Humans; D008962:Models, Theoretical; D011859:Radiography / Q000379:methods*