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An Evaluation of Imaging Plate Characteristics that Determine Image Quality in Computed Radiography

There are currently many kinds of imaging plates available on the market, originating from different manufacturers. Each kind of imaging plate distinguishes itself from the others by its particular physical structure and composition, which have a direct influence on the quality of the digital radiographic images obtained. Several kinds of imaging plates were tested to determine how such physical characteristics were correlated to their response in the final image. This characterization process was conducted by determining the thickness of the sensitive layer and by evaluating its grain size and elemental composition. In order to assess the quality of the digital radiographic images, the readout intensity (gray value), basic spatial resolution (BSR) and normalized signal-to-noise ratio (SNRN) were analyzed. As for the final result, it was observed that, in most cases, the smaller the grain and thickness of the sensitive layer, the lower the imaging plate readout intensity and the better BSR and SNRN. Moreover, imaging plates containing a higher iodine concentration were found to be lower resolution.

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