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KMID : 1151820110050060421
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Journal of the Korean Society of Radiology
2011 Volume.5 No. 6 p.421 ~ p.426
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Assessment of dose effects on image quality at chest computed radiography
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Kang Bo-Sun
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Abstract
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This research was accomplished to assess dose effects on image quality at computed radiography (CR). The ultimate target of the research was finding optimized exposure that provides necessary image quality for the clinical chest diagnosis. Modulation transfer function (MTF), normalized noise power spectrum (NNPS), and Noise equivalent quanta (NEQ) corresponding to the different doses were measured for the assessment of image quality. The preparation of "edge test device" used in MTF measurement and experimental geometry setup were followed by the recommendations of International Electrotechnical Commission (IEC). The experimental results show the necessary image quality can be achieved even at a half of the automatic exposure control (AEC) setting dose for chest diagnosis. It means that the patient exposure can be reduced dramatically by using optimized dose.
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KEYWORD
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computed radiography (CR), chest image quality, dose control, optimized dose, modulation transfer function (MTF), noise power spectrum (NPS), noise equivalent quanta (NEQ)
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