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- W2390940493 abstract "High and low frequency aberration (i.e., non-uniformity) of an image will lead to reduction of inspection sensitivity and false conclusion for a digital radiographic apparatus. Reasons for inducing aberrations come from non-uniformity of radiographic source intensity distribution, light non-uniformity of scintillator screen, lens vignetting, dark current and light response non-uniformity of scientific grade CCD camera. Based on the analysis, a correction method is proposed, by which a correction matrix is obtained by experiments and image is corrected through software, the CCD dark current and light response non-uniformity are firstly corrected, three other factors then by coalition correction. The after and before correction images of No.3 transmissometer(GB4730) attached on 15mm uniformity steel plate gained by portable X-ray source are given. The results show that the sensitivity has been improved from 1.67% before correction to 1.33% and the image non-uniformity has been obviously improved with a spatial resolution more than 3.51p/mm. The system has advantages of high inspecting sensitivity (≤1.5%) and supporting large ray energy range (50keV-15MeV)." @default.
- W2390940493 created "2016-06-24" @default.
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- W2390940493 date "2005-01-01" @default.
- W2390940493 modified "2023-09-23" @default.
- W2390940493 title "Analysis and correction for non-uniformity of a digital radiographic apparatus" @default.
- W2390940493 hasPublicationYear "2005" @default.
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