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Nonuniform Gain Correction Based on the Filtered Gain Map in Radiography Image Detectors
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 Title & Authors
Nonuniform Gain Correction Based on the Filtered Gain Map in Radiography Image Detectors
Kim, Dong Sik;
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 Abstract
Radiography image detector produces digital images by collecting the charges from the incident x-ray photons and converting it to the voltage signals and then the digital signals. The fixed-pattern noise from the nonuinform amplifier gains in the employed multiple readout circuits. In order to correct the nonuniform gains, a gain-correction technique which is based on the gain map is conventionally used. Since the photon noise remains in the designed gain map, the noise contaminates the gain-corrected images. In this paper, experimental observations are conducted for filtering the remained noise in the gain map, and a filter optimization algorithm is proposed to efficiently remove the noise. For acquired x-ray images from detectors, the filtered gain maps are evaluated and it is shown that optimization algorithm can improve the filtering performance even for relatively strong fixed-pattern noises, which cannot be removed by a simple filter.
 Keywords
Filtered gain map;Gain correction;Noise power spectrum;Radiography detector;
 Language
Korean
 Cited by
1.
방사선 디텍터의 Noise Power Spectrum: I. 영상의 평균을 사용한 측정,김동식;이은애;

전자공학회논문지, 2016. vol.53. 12, pp.120-127 crossref(new window)
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