Capabilities of dual-energy x-ray imaging in medicine and security

摘要

The dual-energy computer tomography compared with its traditional single-energy variant ensures substantially highercontrast sensitivity. The evaluation of the signal ratio from high-energy and low-energy detectors has been carried outusing a simplified model of the dual-energy detector array and accounting for the X-ray tube spectrum. We proposed touse of a dual-energy receiving–detecting circuit with a detector pair ZnSe/CsI or ZnSe/CdWO that allows efficientdistinction between muscular and bone tissues, which supports our earlier theoretical assumptions that this method couldbe successfully used for separate detection of materials differing in their effective atomic number Zeff and local density(e.g., calcium contents in bone densitometry), so as can be turn to account for new generation instruments. A possibilityof dual energy tomography use for osteoporosis diagnostics was considered. Direct image reconstruction of biologicalobjects has been carried out, demonstrating details of bones with different density. The density of the bone depends onthe calcium content, which is not more than 20 % for the narrow part and about 18,5 % in the broad part. This resultsobtained were in good agreement with the results of the independent chemical analysis.© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.