Algorithm for dual-energy radiographic analysis
The use of two or more radiographs of an object taken with different x-ray spectral characteristics to infer quantitative values of material density or Z number has been of interest to both the medical and industrial worlds for some time. One method uses monoenergetic isotopic sources with well defined energies in conjunction with standard step wedges and solving the resulting simultaneous equations. Besides the problem of finding isotopic sources with the appropriate energies, you have to have a priori knowledge of the materials in the object. This paper describes an algorithm that does not impose any limitations on the energy spectrum of the sources nor require any knowledge of the object. The algorithm does require that the different radiographs have perfect spatial registration (within a pixel width) and assumes that the transmitted x-ray intensity spectra is the same (within a multiplicative constant) over the image plane. This paper is just a start in developing multi-energy techniques; objects with three or more materials have not been investigated and it is not clear just how this algorithm should be generalized to the multi-energy case.
- Research Organization:
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 10103845
- Report Number(s):
- LA-UR-94-4014; CONF-9407123-4; ON: DE95003675; TRN: AHC29502%%119
- Resource Relation:
- Conference: 1994 review of progress in quantitative nondestructive evaluation conference,Snowmass, CO (United States),31 Jul - 5 Aug 1994; Other Information: PBD: [1994]
- Country of Publication:
- United States
- Language:
- English
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