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Evaluation of digital flash x-ray images produced using computed radiography

Methodologies to extract information from flash X-ray images produced using Computed Radiography (CR) are described. In this process, the exposed image plate is directly and accurately scanned by a laser beam into digital format. Compared with photographic X-ray recordings, better geometrical stability and higher contrast are achieved. This enables more elaborate image and signal processing techniques to be applied to the images, resulting in a higher capacity to extract information from the recordings. Here, the density and velocity profiles along non-particulated shaped charge jets from flash radiography imaging have been evaluated. The mass distribution was estimated using the Abel transform, where the contrast to density calibration was done directly from information extracted from the images. The velocity evaluation was performed in two steps. The sums of intensities along cross sections were evaluated using image processing. By assuming constant jet density and identifying corresponding parts of the curves, the velocity profile along the jet is evaluated.